JOHN DEERE OM-M44250 70 Lawn Tractor Instruction Manual

JOHN DEERE OM-M44250 70 Lawn Tractor

Product Information

Specifications

• Manufacturer: Tecumseh
• Engine: VH 70 Heavy-duty
• Cylinder: Single cast-iron
• Displacement: 15 cu. in.
• Horsepower: 7 HP @ 3600 rpm
• Travel Speeds (mph):
  • 1st Gear: 1.9
  • Reverse: 2.6
• Brakes: Speeds (idle) – 1200-1700 rpm

INTRODUCTION

For more than 134 years, John Deere has been a pioneer in the design and manufacture·of quality farm equipment. Your 70 Lawn Tractor not only embodies the experience gained through the years but has with it the sincere interest and backing of this organization. The 70 Lawn Tractor is manufactured to the traditionally high standards of John Deere. It has many quality features which have been designed with you, the customer, in mind.

Your dealer also is sincerely interested in your new tractor and has the desire to help you get the most •value from it. After reading this manual thoroughly, you will find that you can do many of the regular service jobs quickly and easily. However, when in need of parts or major service, be sure to see your John Deere Consumer Products dealer. This safety alert symbol identifies important safety messages in this manual. When you see this symbol, be alert to the possibility of personal injury and carefully read the message that follows.

The warranty on this tractor appears on your copy of the purchase order which you should have received from your dealer when you purchased the tractor. Right-hand (R.H.) and left-hand (L.H.) reference is determined by standing at the rear of the tractor and facing the direction of travel. When in need of parts, be prepared to give your dealer both the tractor and engine serial numbers. The tractor serial number is just below the dash panel. The engine serial number is on the left-hand side of the engine shroud. Locate the serial numbers now and record them here.

SPECIFICATIONS

• Manufacturer . . . . .. . . . . . . . . . . . . . . . . . . . . Tecumseh
• Model . . . . . . .. . . . . . . . . . . . . . . . . VH 70 Heavy-duty
• Cylinder. . . . . . . . . . . . Single cast-iron
• Bore and stroke . . . . . . . . . . . . . . . . . . . . 2. 75 x 2.53 in.
• Displacement . . . . . . . . . . . . . . . . 15 cu. in.
• Type . . . . . . . . . . . . . . . 4-cycle vertical crankshaft
• Speeds (fast) . . . . . . . . . . 1800-3600 rpm
• Speeds (idle) . . . . . . . . . . . 1200-1700 rpm
• Horsepower . . . . . . . . . . . . . . . . . . . . . . 7 HP @ 3600 rpm
• Valve Clearance (intake) cold .. . . . . . . . . . . . . . . 0.010 in.
• Valve Clearance (exhaust) cold . . . . . . . . . . . . . . . 0.010 in.
• Compression Release. . . . . . . . . . . . . . Internal mechanical type

ELECT RI CAL SYSTEM

• Battery, John Deere (AM30094). . . . . . . . . . . . . . . 12 volts, 24 amp. hr.
• Charging System. . . . . . . . . . . . . .Alternator with Rectifier
• Rectifier . . . . . . . . . . . . . . . . .. . . . . . . . . . . . AM30946
• Rectifier Fuse . . . . . . . . . . . . . . . . . . . . . .. . . . . AGC-6
• System Polarity . . . . . . . . Negative Ground
• Starter. . . . 12-volt motor, key, and solenoid
• Ignition . . . . . . . . . . . . . . . . . . . Magneto
• Spark Plug Gap . . . . . . . . . . . . . . 0.030 in.
• Breaker Point Gap . . . . . . . . . . . . 0.020 in.

CAPACITIES

• Fuel Tank. . . . . . . . . . . 1-1/4 U.S. Gallons
• Crankcase . . . . . . . . . . . . .. . . . . 1-1/2 U.S. Pints
• Transmission. . . . . . . . . . . . 3 U.S. Pints

LUBRICANTS

• Crankcase . . . . . . . John Deere Torq-Gard Engine Oil (See page 7)
• Transmission . . . . . . AM30200 Lubricant

AIR CLEANER

• Type . . . . . . . . . . . . . AM30900 Dry Filter

FUEL SYSTEM

• Type of Fuel . . . . . . Regular or non-leaded gasoline
• Filter . . . . . . . . . . . . . . In-line strainer

TRANSMISSION

• Type . . . . . . . . . . . . . . . . . . . . Transaxle Gear Selections 3 forward-! reverse

TRAVEL SPEEDS (mph)

• 1st Gear ………………… . 1.9
• 2nd Gear . . . . . . . . . . . .3.3
• 3rd Gear . . . . . . . . . . . .5.0
• Reverse. . . . . . . . . . . . . . . . . . . . . . . . .2.6

BRAKES

• Type. . . . . . . . . . . . . .. . . . . . . . . Band, pedal-operated
• Parking . . . . . . . . . . Hand lock to foot brake
• CLUTCH . . . . . . . . . . . .. . . . . . . . . . . . . . . .. . . . . V-Belt

WHEEL TREAD

• Front . . . . . . . . . . . . . . . . . . . . . 23.4 in.
• Rear. . . . . . . . . . . . . . . . . .. . . . .. . . . . . . . . . . . . . . 22.5 in.

TIRE SIZES

• Front . . . . . . . . . . . . . . . . . . . 5.00 – 13
• Rear . . . . . . . . . . . . . . . . . . . 8.50 18

TIRE INFLATION

• Front (with rotary mower) . . . . . . . . . . . . . . . . . . . 12 psi
• (with snow thrower or front blade) . . . . . . . . . . . . . . . . . . .20 psi
• Rear . . . . . . . . . . . . . . . . . . . 6 psi

DIMENSIONS

• Wheel Base . . . . . . . . . . . . . . . . . .42.5 in.
• Over-all Length. . . . . . . . . . . . . . . . . .59 in.
• Over-all Height . . . . . . . . . . . . . . . . . .37 in.
• Over-all Width . . . . . . . . . . . . . . . . . .30. 7 in.
• BARE WEIGHT. . . . . . . . . . . . . . . . . .384 lbs.

EQUIPMENT

• 34 Rotary Mower. . . . . . . . . . . . . . . . .80 Dump Cart
• 32 Snow Thrower. . . . . . . . . . . . . . . . .No. 8 Dump Cart
• 40 Front Blade. . . . . . . . . . . . . . . . .No. 5B Sprayer

ACCESSORIES

• Chrome Hub Caps . . . . . . . . . . . . . . . . . Utility Tray
• Deluxe Seat. . . . . . . . . . . . . . . . .Weather Enclosures
• Rear Wheel Weights. . . . . . . . . . . . . . . . .Headlights and Taillights
• Tire Chains. . . . . . . . . . . . . . . . .Engine Oil – 8 oz.
• All Weather Cover. . . . . . . . . . . . . . . . .Transmission Oil – 8 oz.
• Fuel Gauge. . . . . . . . . . . . . . . . .Air Filter
• Hourmeter. . . . . . . . . . . . . . . . .Pisto-Luber Battery Charger

(Specifications and design are subject to change without notice.)

OPERATION

CONTROLS
Before operating your new tractor, become familiar with the location and purpose of its controls.

Clutch-Brake Pedal

• Depressing the clutch-brake pedal does two things: It disengages engine power and at the same time applies braking pressure. The clutch-brake pedal also actuates a safety switch.
• The pedal must be depressed to make electrical contact when starting the tractor electrically.
• When starting the tractor manually, the pedal must also be depressed and the parking brake set.

Parking Brake Knob

• To set brakes for parking, depress the clutch-brake pedal down.
• Hold the pedal down, lift the parking brake knob, and move it forward.
• To release the parking brake, hold the clutch-brake pedal down, lift the parking brake knob and move it rearward.

Shift Lever
The gear shift lever is used to select the proper transmission gear speed. There are three forward positions and one reverse position. A diagram in front of the lever identifies the gear positions.

Power Take-Off Clutch Lever (PTO)
The power take-off clutch lever controls power to equipment such as the mower or snow thrower. Moving the lever rearward disengages power; moving it forward engages power. This lever also actuates a safety switch. The lever must be in the disengaged position to start the tractor engine electrically.

Equipment Lift Lever and Lift Stop

• Mounted equipment (mower, snow thrower, or front blade) is controlled with the lift lever.
• Press the thumb release and move the lever forward to lower the equipment; pull the lever rearward to raise the equipment. Release thumb release to the lock lever in the desired position.
• The lift stop ensures that mounted equipment will return to the same setting each time it is lowered.

Ignition Key Switch
The ignition key switch is on the ignition and energizes the starter. When turned clockwise to the first position, · RUN,” the ignition is on. Turning past this position to “START” energizes the starter. Turning the key counterclockwise shuts “OFF” the ignition.

Throttle-Choke Lever
This lever controls the engine speed and when moved to the highest position chokes the engine for starting.

**OPERATING THE ENGINE

**

ENGINE BREAK-IN
Change the oil in the engine crankcase as instructed on page 8 after the first two hours of operation. No special break-in oil is required.

PRESTARTING INSPECTION
Before starting the engine, perform the following checks and services:

• Check fuel supply. Use regular or non-leaded gasoline only. See page 7.
• Be sure the oil in the engine crankcase is at the proper level. Add oil as needed to maintain the indicated level. See page 8.
• Be sure the air filter is free of obstructions and excessive dirt. Clean as instructed on page 8.

STARTING THE ENGINE

Electric Starting

1. Disengage the PTO clutch by pulling the PTO lever to the rear position.
   NOTE : This is a safety feature. The tractor will not start electrically unless the PTO clutch is disengaged.

2. Depress the clutch-brake pedal and hold it down to apply braking pressure.
   NOTE : This is a second safety feature. The tractor will not start electrically unless the clutch-brake pedal is depressed.

3. If the engine is cold, raise the throttle-choke lever to the highest position. After the engine begins to run, lower the lever immediately. If the engine is warm, place the lever in an idle position for starting.

4. Turn the ignition key to the right as far as possible to start the engine.

Manual Starting
Your tractor also can be started manually if the battery becomes discharged or if the electrical system should become inoperative for any reason.

IMPORTANT:
Disconnect the rectifier wire at connector “A,” (see page 13) whenever the battery is inoperative or removed from the electrical system. Failure to disconnect the rectifier wire will cause damage to the electrical system.

1. Place the shift lever in the “NEUTRAL” position.

2. Depress the clutch-brake pedal and hold it down on the parking brake knob and slide it forward in the slot, locking the brake.

3. Disengage the PTO clutch by moving the PTO lever to the rear position.

4. Raise the throttle lever to the choke position as required for normal starting.

5. Turn the ignition key to the “RUN” position.

6. Insert the starter rope knot in the slot in the engine sheave and wrap the rope clockwise around the sheave. Pull the rope to start the engine.
   NOTE : Any rope may beusedtostarttractor, or the AM32088 Rope Assembly (shown) may be ordered from your John Deere Consumer Products dealer.

7. Move the throttle lever from the choke position to the operating range.
   IMPORTANT : The above procedure must be followed for safe manual starting of the engine.

STOPPING THE ENGINE

• Allow the engine to idle for a few minutes until it cools. Abrupt stopping of a hot engine can damage the engine intake and exhaust valves.
• Turn the ignition key counterclockwise to the “OFF” position and remove the key.

CAUTION: Always remove the ignition key before leaving the tractor to prevent unauthorized operation.

OPERATING THE TRACTOR
Hold the clutch-brake pedal down, lift the parking brake knob, and move it rearward to release the parking brake.

ENGINE WARM-UP
Always allow the engine to warm up before applying load.

SELECTING TRAVEL SPEED
Tractor travel speed is regulated by shifting the transmission into one of three forward or one reverse gear positions, or by adjusting the throttle position. Maximum speeds are as follows:

Gear Position

• 1st
• 2nd
• 3rd
• Reverse

Speed (mph)

• 1.9
• 3.3
• 5.0
• 2.6

Always operate the mower and snow thrower at full throttle. Select the transmission gear that will give a safe travel speed with these attachments when the engine is operating at full throttle.

SHIFTING GEARS
To shift transmission gears, partially depress: the clutch-brake pedal and move the shift lever into the desired gear position.

NOTE : The tractor must be completely stopped before shifting gears. The combination clutch brake pedal makes this easy. When shifting gears, use a strong, steady force to slide gears firmly into the mesh. Never allow gears to “grind” while shifting.

It may be necessary to let the clutch out quickly and then depress the pedal so the gears rotate enough to permit easy engagement.

STOPPING TRACTOR

1. Depress the clutch-brake pedal and move the shift lever into a neutral position.
2. Hold the clutch-brake pedal all the way down, lift the parking brake knob, and move it forward to set the brake.
3. Disengage power take-off clutch and lower attachments to the ground.
4. Idle the engine and turn the ignition key to the “OFF” position.

CAUTION : Always Remove the Ignition Key Before Leaving Tractor

RAISING AND LOWERING MOUNTED EQUIPMENT

• Press thumb release and pull lever rearward to raise equipment; push forward to lower equipment.
• To lock the lever in position, release your thumb. Numbers 1, 2, 3, and 4 on the lever quadrant correspond with the mower gauge wheel positions 1, 2, 3, and 4 shown on the inset in the illustration above.
• With both the lift lever and mower gauge wheel in position 1, the mower is properly adjusted for the shortest grass cutting. Positions 2, 3, and 4 will cut grass higher.
• Select the desired height of the cut with the lift lever. Make sure the gauge wheel position corresponds with the number on the lever quadrant. This is important because it allows some of the mower weight to be carried on the tractor which prevents the gauge wheels from dropping into low spots and the blades from scalping the ground.
• Pull downward on the stop and pivot into the detent behind the quadrant to stop the lever (and mounted equipment) at the same position each time the equipment is lowered.
• Move stop to position 1 when installing the mower on the tractor.
• To lock attachments in the transport position, pull the lever back and move the stop to the last (lowest) notch on the quadrant.

ENGAGING POWER TAKE-OFF CLUTCH

• Both the mower and snow thrower are engaged and disengaged with a power take-off (PTO) clutch lever. Move the lever forward to engage the clutch. Move the lever rearward to disengage the clutch.
• Engage the power by taking off the clutch slowly to avoid a sudden load on the drive mechanism.

ADJUSTING THE POSITION OF THE SEAT

• The upper part of the tractor seat spring is slotted to permit forward or rearward adjustment of the seat.
• Loosen the four cap screws and slide the seat to the desired position. Tighten cap screws securely.
• The lower part of the spring can be moved 1-1/2 inches to the rear by removing the four cap screws and installing them in the rear set of holes in the tractor deck.

SAFETY SUGGESTIONS

• Improper use of a lawn tractor and its equipment on the part of the operator can result in injury.
• To reduce this possibility, give complete and undivided attention to the job at hand, and follow these safety suggestions.
• Know your controls. Read this operator’s manual and the one for your attachments. Learn how to stop the tractor, engine, and attachments quickly in an emergency.
• If the tractor is to be started manually, be sure to place the gear shift lever in neutral and set the parking brake.
• Start the engine carefully. Keep feet and hands well away from the blades.
• Always wear relatively tight and belted clothing when operating a tractor. Loose jackets, shirts, sleeves, or other loose clothing should not be worn because of the danger of catching them in moving parts or controls.
• Keep children and pets a safe distance away.
• Never allow passengers to ride or board the tractor at any time.
• Do not allow children to operate the machine, nor adults to operate it without proper instruction.
• Never refuel your tractor with the engine running.
• Never smoke while filling the fuel tank.
• Use an approved gasoline container. Use care when filling the tank to prevent gasoline from spilling on hot mufflers. Fill the tank out of doors and wipe up spilled gasoline. Replace the gas cap securely.
• During refueling, never touch the battery with a gas can, hose nozzle, or other metal objects.
• Always keep the positive battery post covered with a rubber boot on the end of the cable.
• Be careful on hillsides and turns. The rate of tractor travel on hillsides and turns should be such that there is no danger of tipping. Be careful to prevent your tractor from tipping sideways if it strikes a hole, ditch, or other irregularity, especially when operating on hillsides. Don’t start or stop suddenly when going uphill or downhill.
• Always drive slowly over rough ground. Drive at speeds slow enough to ensure your safety. Know what is behind you before backing up.
• Use care when attaching drawn equipment to the tractor hitch. Back the tractor past. the clevis; then move slowly forward so that in making the connection the tractor will be moving away from the equipment.
• Do not over-speed the engine or alter governor settings. Excessive speed is dangerous. It shortens tractor life too. Stop the tractor after striking a solid object.
• Inspect the tractor and attachment for damage and make necessary repairs before restarting and operating the mower.
• Never operate the tractor engine in a closed building, where carbon monoxide fumes can collect.
• Before dismmmtingfrom the tractor, stop the engine, shift the transmission to neutral, and set the parking brake. Always shut off the engine and remove the ignition key before leaving the tractor.
• After operating the tractor or engine, never touch the exhaust muffler until it has had sufficient time· to cool.
• Prevent accidental operation of the starter or engine. Always turn off the key switch and disconnect the spark plug cable whenever working on the electrical system. Also, do this when making adjustments to the engine or other moving parts.
• Always maintain the tractor properly. Check all fasteners, guards, and parts frequently. Built-in safety features are effective only if maintained.

FUELS AND LUBRICANTS

FUELS
FILLING FUEL TANK

• Raise the tractor hood and wipe dust and dirt from around the filler cap before removing it.
• Keep dirt out of the tank while filling.
• Fill the gas tank with fresh regular-grade or non-leaded gasoline having an octane rating of 90 or higher.
• DO NOT use premium, ethyl, or white gasoline. Never use special additives such as carburetor cleaners, de-icers, or moisture-removing liquids in your gasoline.

NOTE : Do not mix oil with gasoline. Be sure fuel containers are absolutely clean. Use care when filling the gas tank to prevent gasoline from spilling on the hot muffler.

CAUTION : Use precaution when handling fuel. Never refuel the tractor when the engine is hot or running. Do not smoke while filling the fuel tank. Never touch the battery with a gas can, hose nozzle, or other metal objects. Always make sure the positive battery post is covered with a rubber boot on the end of the cable.

LUBRICANTS

ENGINE CRANKCASE
We recommend JohnDeereTorq-Gardengine oil for use in the engine crankcase. Torq-Gard was compounded specifically for use in John Deere engines and provides superior lubrication under all conditions.

NEVER PUT ADDITIVES IN THE CRANKCASE.

Torq-Gard oil was formulated to provide all the protection your engine needs. Additives could reduce this protection rather than help it. If oil other than Torq-Gard is used, it must conform to the following specifications. MIL-L-2104B or AP! Service CC AP! Service SD (Previous AP! service designation MS or MS-DM)

NOTE: As further assurance of quality, use oil bearing a statement on the container that the oil meets the car manufacturer’s warranty requirements.

Depending on the highest expected prevailing temperature for the fill period, use oil of viscosity as shown in the following chart.

John Deere Torq-Gard Engine Oil

*Some increase in oil consumption may be expected when SAE 5W-20 oil is used. Check the oil level more frequently.

TRANSMISSION
Use AM30200 Transmission Lubricant in tractor transmission. This select non-foaming oil is especially suited for your transmission and can be purchased from your John Deere Consumer Products dealer in 8-ounce cans. It may be used in any weather condition. The transmission holds 3 U.S. pints of oil.

John Deere SAE 90 Gear Lubricant or an equivalent SCL multipurpose-type gear oil also can be used in the transmission.

GREASE FITTINGS

• Lubricate grease fittings with John Deere Multi-purpose lubricant or an equivalent multipurpose- type grease.
• Use either a hand grease gun or the AM31300 John Deere Pisto-Luber with a flexible hose and throwaway tube available from your dealer.

LUBRICATION AND PERIODIC SERVICE
Lubricate and service your tractor in the following order of frequency.

• Daily or every 5 hours of operation.
• Every 25 hours of operation (weekly).
• Each spring and fall season.
• Every 200 hours or two years.

DAILY OR EVERY 5 HOURS OF OPERATION

CHECK ENGINE CRANKCASE OIL LEVEL:

• Raise tractor hood, wipe off dust and dirt, and unscrew the oil dipstick.
• If necessary, add sufficient oil to the proper viscosity (see previous page) to bring the oil level up to the “F” mark on the dipstick when the dipstick is screwed in tight.
  • NOTE : Oil should not be over the “F” mark. Be sure the tractor is on level ground and the engine is stopped before checking the oil level.
• The use of SAE 5W -20 oil may cause some increase in oil consumption. Check the oil level more often when using this oil.

EVERY 25 HOURS OF OPERATION (WEEKLY)

CHANGE ENGINE CRANKCASE OIL:

• Drain crankcase when oil is hot and all dirt and foreign material are in suspension.
• Park the tractor on a slope or block up the left-hand side of the tractor to be sure the oil drains completely.
• Remove the crankcase drain cap (illustrated at left) and drain oil.
• Replace the drain cap and refill the crankcase with oil of the proper viscosity (see previous page) to the “F” mark on the dipstick. Crankcase capacity is 1-1/2 U.S. pints (three 1/2 pint cans of John Deere AR53085 summer or AR53086 winter grade oil).

NOTE : Change oil daily when working in extremely dusty conditions.

CLEAN AIR FILTER

1. Remove the cover and lift out the air filter.
2. Clean the filter by tapping it lightly on a solid flat surface and brushing out dust with a brush. This is a dry-type filter.
3. Do not dip the filter into a liquid cleaner of any type.
4. Replace the filter if bent, crushed, or damaged.
5. Under extremely dusty conditions replace filter with Part No. AM30900, when discolored and clogged.
6. Wipe dust from the top and edges of the filter and inside of the cover.
7. Place the filter in position making sure it seals around the bottom plate.
8. Replace the cover and tighten the screws.

IMPORTANT : Never run the engine with the filter removed.

CHECK BATTERY

• Keep battery terminals clean and free of corrosion.
• Coat terminals with petroleum jelly.
• Keep connections tight to prevent arcing and pitting.
• Make sure the electrolyte level is at the top of the circular split ledge in the filler tube. If necessary, add distilled water.

IMPORTANT : Always check the electrolyte level after charging. If necessary, add distilled water to bring the electrolyte back to the proper level. When adding water to the battery during freezing weather, run the engine for at least an hour to make sure water and electrolytes have mixed thoroughly.

CAUTION : Battery electrolytes are poisonous and can be injurious to eyes, skin, and clothing. Handle it carefully.

LUBRICATE FRONT WHEELS, STEERING AND CLUTCH
Lubricate the grease fittings indicated below, using a John Deere Pisto-Luber or hand grease gun. Wipe fittings clean before and after lubrication.

Symbol
Lubricate every 25 hours of operation (weekly) with John Deere Multi- Purpose 258 \Lubricant or an equivalent SAE multipurpose- type grease. Lubricate front wheel bearings daily or every 5 hours under extremely dusty conditions.

CHECK TIRE PRESSURE
Inflate front tires to 12 psi if the tractor is equipped with a rotary mower. Inflate to 20 psi if equipped with a snow thrower or front blade. Inflate rear tires to 6 psi. Use a low-pressure tire gauge to check inflation.

EACH SPRING AND FALL SEASON

• Perform the following service each fall and again in the spring. If the tractor is to be stored, see page 15.
• Repeat all 25-hour service checks and perform additional service as follows:

CLEAN ENGINE COOLING FINS AND SHROUDS

• Keep the engine shroud and cooling fins clean ‘ to prevent damage from overheating. Close the fuel shut-off valve and disconnect the gas line at the valve.
• Remove four screws (two on each side) holding the tractor grille to the frame. The hood and gas tank assembly will come off with the grille.
• Remove the bolts holding the engine shroud in place and brush out all dirt from the cooling fins. Clean the inside of the shroud thoroughly. Soak foil deposits with a safe solvent.
• Clean and brush the intake screen above the engine flywheel. Clean oil and dirt from flywheel fins.

IMPORTANT : Do not run the engine with shrouds removed.

CHECK SPARK PLUG GAP
Use a spark plug wrench to remove the plug. The distance between the electrodes should be .030 inches. Bend the outer electrode only for the proper gap. If the electrodes have burned short or have become pitted, install a new spark plug. Tighten the spark plug to between 15 and 20 ft-lbs torque.

CLEAN FUEL STRAINER

• Shut off fuel by turning the fuel shut-off valve clockwise. Remove the hose from the end of the valve. Open the fuel shut-off valve (turn counterclockwise) and drain fuel into a clean container.
• Unscrew the fuel shut-off valve and strainer assembly from the fuel tank. Wash in gasoline or solvent. Replace valve assembly and connect hose.

CHECK TRANSMISSION OIL LEVEL

• Remove the oil level (filler) plug from the front of the transaxle.
• When required, use a pressure oil can add AM30200 · Transmission Lubricant or its equivalent through a filler hole until oil spills out. Be sure the tractor is on a level surface when checking.
• A JD93 Pressure Oil Can (illustrated) is available from your dealer.

REPACK CLUTCH BEARINGS

• Remove the locking pin and detach the linkage from the PTO clutch assembly.
• Remove old grease from bearings in a lower clutch cone with solvent at the beginning of each spring and fall season or sooner if dirt is found in the bearings.
• Dry thoroughly and repack bearings with John Deere High-Temperature Grease or its equivalent. John Deere High-Temperature Grease is available in 1-pound cans as PartNo. AT30408-.
• Replace the linkage and locking pin.

LUBRICATE STEERING COLUMN
Lubricate fitting on the steering column each, spring and fall seasons. Do not overlubricate. Only three or four strokes with a hand grease gun or AM31300 Pisto-Luber are necessary. Do not use a high-pressure grease gun on this fitting.

EVERY 200 HOURS OR TWO YEARS
CHANGE TRANSMISSION 01. L Every 200 hours or two years, whichever comes first, remove the transmission drain plug and drain all oil. Replace the plug and add six, 8-ounce cans of AM30200 Transmission Lubricant or its equivalent through the filler hole. See the illustration at the upper left

DEALER SERVICES
If your tractor requires service or adjustments not covered in this manual, see your John Deere dealer who offers complete tractor service. His trained personnel have access to accurate detailed service information. Because special tools are required, it is not recommended that you service. or dismantle any part of the transmission. See your John Deere Consumer Products dealer for all transmission services.

STORAGE
If the tractor is to be stored for the season, prepare it for storage as instructed on page 15.

SERVICE

REMOVING HOOD

• Raising the tractor hood allows access to the engine for most service requirements. Remove the hood when necessary by springing the hood outward at each pivot pin. Remove the hood from one side at a time to minimize deflection and the chance of cracking.
• The front grille panel does not have to be removed to remove the spark plug.

RAISING OR TILTING THE TRACTOR FOR SERVICE
Tilt the tractor only to the right side or to the rear making sure that gasoline and battery electrolytes do not spill out. Tilting forward for prolonged periods of time or to the left may cause oil to seep into the combustion chamber causing mechanical damage when the tractor engine is started. For the same reason, always park the tractor on a relatively level surface.

FUEL SYSTEM

Adjusting Carburetor
If, after a period the engine misses, backfires, surges, or starts hard, carburetor adjustment may be required. Idle adjustment and high-speed adjustment must be made at the same time as each affects the other. Adjust as follows:

1. Turn power screw clockwise until closed. Close your finger tight only. Then open one complete turn.
2. Turn the le screw clockwise until closed. Close your finger tight only. Then open one and one-half turns.
3. Start the engine and raise the throttle lever on the dash panel to the “FAST” position. Allow the engine to warm up.
4. Turn the power screw clockwise or counterclockwise, until the engine runs smoothly at full throttle. Keep the screw position slightly on the rich side (open) when operating the tractor with power-driven equipment such as the mower or snow thrower.
5. Final idle adjustment should be made at an engine speed of 1200 to 1700 rpm. Move the throttle lever to the “SLOW” position and turn the idle screw clockwise or counterclockwise until the engine idles smoothly.
6. Raise the throttle lever quickly to check for uniform acceleration. If the engine misses, the as-air mixture is too lean. Turn the power screw counterclockwise until positive acceleration can be obtained.

If excess exhaust smoke is noticed, the mixture is too rich. Readjust the idle screw until a good balance is achieved and the engine idles smoothly. Screw “A” adjusts the speed at which the engine idles. This is factory-adjusted and will not normally require adjustment. Leave all other adjustments of carburetor and governor to your John Deere serviceman.

ELECTRICAL SYSTEM

Replacing Battery

1. Your tractor has a 12-volt negative ground electrical system. When replacing the battery, use a 12-volt, 24 ampere-hour rated battery-preferably a John Deere AM30094 Battery.
2. Before removing the battery, disconnect the rectifier circuit at connector “A.” This will prevent the burning of rectifiers if the tractor is started manually while the battery is removed.

IMPORTANT : When replacing the battery be sure to connect the solenoid cable to the positive (+) battery terminal and the ground cable to the negative (-) battery terminal. Reversing these connections, even for a short time, may burn out the fuse on the rectifier panel or cause other damage to the electrical system.

CAUTION :

• Make sure the positive battery post is covered with a rubber boot on the end of the cable.
• Keep rubber boot in place on solenoid connection also.
• Never allow sparks or flames near a charged battery.
• If the battery becomes overcharged after prolonged periods of tractor operation and the electrolyte begins to fume or “boil out,” disconnect the rectifier circuit at connector ”A.” This will reduce the charging rate by 50 percent.

See page 9 for additional battery information.

Cleaning Battery

• Remove cables and use a wire brush to remove corrosion around battery terminals. Wash terminals with a solution consisting of one part baking soda to four parts water. Do not allow the cleaning solution to run into battery cells.
• Wash the entire battery case, and platform and hold down straps with clear water and wipe dry.
• Be sure the top and bottom vent holes in each cell cap are open.

IMPORTANT : Starting a tractor with a manual starter when the battery is removed, disconnected, or has a dead cell, can burn out rectifiers. Always disconnect the rectifier circuit at connector 11 A11 before starting the engine with the manual starter if the battery has been removed, disconnected, or has a dead cell.

Replacing Rectifiers and Fuse

The rectifiers are protected by a fuse which will burn out if polarity is reversed by accidentally reversing the positive and negative battery connections. The tractor will start but the battery will not charge if the fuse is burned out.

Both rectifiers are identical and interchangeable. However, they are directional and must be inserted to fit the matching retainers. Align the slotted end of the rectifier with mating prongs in the retaining clip and press in place. Be sure the tractor engine is stopped and the ignition key is turned off before replacing rectifiers.

Do not place the rectifier against contacts while in the reverse position. To do so may burnout rectifier.

IMPORTANT : Operating the tractor with a burned-out fuse can burn out the rectifiers. If the fuse has burned out, disconnect the rectifier circuit at connector II A11 until a replacement fuse can be installed. Use an AGC6 6-amp. fuse for replacement.

Adjusting Breaker Points
Breaker point adjustment and magneto service should be made by your John Deere serviceman.

ADJUSTING POWER TAKE-OFF CLUTCH
Check clutch adjustment periodically to be certain the clutch is not slipping and power-driven equipment is engaging and disengaging properly. To check adjustment:

1. Engage PTO clutch.
2. Observe that the clutch arm is level or parallel with the tractor frame. If not, remove the locking pin and lower clutch arm. Loosen the jam nut and turn the fulcrum either up or down until the arm is approximately level when the PTO clutch is engaged and the locking pin is in place.
3. Engage and disengage the clutch slowly with the PTO lever. Observe at what point the clutch cones begin to contact each other. From this point to full engagement of the PTO lever, the clutch lever should deflect 1/2 inch. This will properly tension clutch cones for positive engagement.
4. Move nuts on the end of the clutch rod as required until proper lever deflection is obtained. Refer to page 11 for clutch bearing service information.

ADJUSTING POWER TAKE-OFF CLUTCH BRAKE

• The PTO clutch brake stops the mower blades or snow thrower rotor quickly after disengaging the drive with the PTO lever.
• Engage the PTO lever and check the distance between the brake and clutch cone. See above. When properly adjusted, this distance should be approximately 1/ 16-inch.
• If adjustment is required, loosen the cap screw and slide the brake shoe in the slotted hole until 1/16-a-inch clearance is obtained. Tighten the cap screw firmly.

V-BEL T CARE AND MAINTENANCE
Never pry belts over the edge of sheaves because it will rupture belt cords and shorten belt life. Clean belts by wiping them with a clean cloth. Avoid solvents. Wipe off spilled oil 011 grease immediately. Do not use belt dressings. They shorten belt life and may cause the clutch to “grab.”

REPLACING V-BEL TS

CAUTION : Remove the ignition key and connect the spark plug wire when rep belts.

Replacing Primary Belt

• Remove the spring locking pin. Disconnect the clutch arm from the fulcrum and clutch cone. Unhook spring from front idler arm. Slip the belt off both front and rear sheaves.
• Place a new primary belt on sheaves with the bottom strand running from rear rear-driven sheave to the left-hand side of the front sheave. Reassemble the spring, clutch arm, and spring locking pin.

NOTE : Installing the belt with a reverse twist will result in reverse tractor travel.

Replacing Secondary Belt

M41592

• Depress the clutch-brake pedal and set the parking brake. Remove four cap screws (one under each fender and two under the seat) holding the fender deck in place.
• With the fender deck removed, loosen the cap screws and slide the rear belt guide out of the way.
• Remove the front belt guide (illustrated above).
• Unhook spring from front idler arm. Remove the primary belt from the rear sheave.
• Remove the spring hooked to the rear idler arm.
• Loosen cap screws on the rear idler mount. Remove the secondary belt.
• Install a new secondary belt on sheaves. Tighten the ap screws on the rear idler mount. Replace the primary belt and hook spring to the front idler arm.
• Install front belt guide. Hook spring to the rear idler arm.
• Reposition the rear belt guide and tighten the cap screws. Replace the fender deck and tighten the cap screws.

STORING TRACTOR

1. If your tractor is not to be used for an extended time, drain the gas tank and line.
2. Drain the carburetor bowl by pushing up on the drain plunger, page 12. Remove, clean, and reinstall the fuel shut-off valve and strainer, page 10. Wipe all oil, grease, and dirt from the tractor.
3. Paint where necessary to prevent rust.
4. Remove the spark plug and pour in approximately one tablespoon (1 ounce) of SAE 30 oil. Turn the engine manually at least two revolutions and replace the spark plug.
5. Drain and refill the engine crankcase with the proper viscosity motor oil. Park the tractor on a relatively level surface.
6. Block up the tractor to take the weight off the tires. Clean belts with a dry cloth.
7. Remove the battery and store it where it will not freeze. Disconnect the wire at connector “A,” page 13, on the rectifier panel to prevent burning out rectifiers if the tractor is started manually while the battery is removed.

REMOVING TRACTOR FROM STORAGE

Refill gas tank. Clean and gap spark plug. Reinstall the battery and check the electrolyte level. Connect wire to rectifier panel. Check transmission oil level and tire inflation.

TROUBLESHOOTING

ELECTRIC STARTER INOPERATIVE OR WILL NOT TURN ENGINE

• A. Clutch-brake pedal is not fully depressed.

1. Depress the clutch-brake pedal.

• B. PTO clutch lever is engaged.

1. Pull the clutch lever to the rear (disengaged position).

• C. Solenoid clicks but the engine will not start.

1. Check for the discharged battery.
2. Check electrical connections.

• D. Engine still will not start.

1. Check electrical connections.
2. Check for faulty clutch brake and PTO safety start switches.

HARD STARTING

• A. Faulty Ignition.
  Check for spark by disconnecting high tension wire from the plug and holding the wire close to the cylinder head while cranking the engine with the starter. If no spark, check:

1. The spark plug gap is incorrect. See page 10.
2. Spark plug electrodes are pitted or fouled. Replace plug.
3. The breaker point gap is incorrect or breaker points are worn or pitted. See your dealer to set point gaps or replace points.
4. Faulty magneto. See your dealer for magneto service.

• B. Faulty Carburetion.

1. Gasoline may not be getting to the carburetor because the fuel line or strainer may be gummed and plugged. Clean strainer and fuel line.
2. The carburetor may be dirty or out of adjustment. See page 12.3.
3. Engine flooded. Move the throttle lever to a fast position and crank the engine several times.
4. The choke is partly closed. See your dealer for throttle-choke cable adjustment.

ENGINE MISSING UNDER LOAD·

• A. Check the spark plug for the proper gap. See page 10.
• B. Check for lean fuel mixture. Adjust the carburetor high-speed screw. See page 12.
• C. Check for dirty (fouled) spark plugs or improper type plugs.
• D. Pitted or worn breaker points should be. replaced with a new set. See your dealer.
• E. See your serviceman for proper ignition, magneto, and carburetor adjustments.

BACKFIRING

• A. Check the carburetor for lean fuel mixture. See page 12.
• B. Sticky intake valve or improper ignition. See your serviceman or dealer.

KNOCKING

• A. Use only a quality grade of regular or nonleaded gasoline.

• B. Check engine for overheating. See “Overheating” on the next page.

• C. Check crankcase oil level. Fill in the” F” mark on the dipstick.
  NOTE : If engine knock has developed because of a lac of crankcase oil, have your dealer check the condition of the piston rod and cap.

• D. Check carbon.  editor for lean fuel mixture. See page 12.

• E. See your serviceman for possible loose connecting rods, improper timing, or excessive carbon in the combustion chamber.

LOSS OF ENGINE POWER

• A. Overheating .

1.  **Check** and clean the intake screen and engine shrouds. See page 10.
2. Check for the use of premium gasoline with a high octane rating. Use regular or nonleaded gas only. See page 7.
3. Check the carburetor for a lean fuel mixture. See page 12 for instructions on adjusting the carburetor.
4. Check the oil dipstick for excessive or too little oil in the engine crankcase. Maintain the oil level at the full ” F” mark on the dipstick. See page 8.
5. Have your dealer check breaker points for proper gaps.
6. Remove excessive load on the tractor.

• B. Dirty Air Filter.

1. Check and clean the air filter. See page 8.

• C. Choke is Partly Closed When Operating at Full Throttle.

1. Have your dealer make sure the throttle choke control cable is properly adjusted.

ENGINE OPERATING ERRATICALLY

Check the following:

• A. Carburetor setting.
• B. Clogged fuel line.
• C. Water in fuel. Drain fuel and clean the fuel line.
• D. Faulty choke control.
• E. Loose spark plug wire.
• F. Air leaks in carburetor connections or gasket.
• G. Carburetor jet clogged.
• H. Loose throttle cable.
• I. Fuel tank vent hole plugged.

ENGINE WILL NOT IDLE

• A. Check carburetor adjustments. See page 12.
• B. Dirty carburetor.
• C. Check and set the spark plug gap. See page 10.
• D. Check the carburetor for air leaks in the gasket.
• E. See your serviceman for possible leaky valves or faulty condensers.

TRANSMISSION WILL NOT STAY IN GEAR

• A. Shift gears firmly without letting g e a r s “grind” before engaging.
• B. See your serviceman to replace worn gears.

BRAKES NOT EFFECTIVE

• A. Have your dealer adjust the brake linkage.
• B. Have serviceman replace brake ~and if worn excessively.

IMPROPER STEERING OR EXCESSIVE FRONT TIRE WEAR

• A. Have your dealer check and adjust the steering gear.

BATTERY WILL NOT CHARGE

• A. The fuse on the rectifier panel is burned out.
  1. Replace fuse. See page 13. Be sure the polarity is not reversed.
• B. Rectifier burned out.
  1. See the dealer to check both rectifiers. Disconnect the rectifier circuit (page 13) before starting the tractor without the battery.
• C. Electrical connections are loose.
  1. Tighten connections.
• D. Battery has a dead cell.
  1. Replace the battery and have your dealer check the condition of the rectifiers.

SERVICE MANUAL AVAILABLE…
For owners who want to perform more service on their tractors than is explained in the opera- tor’s manual, we offer a detailed, well-illustrated 174-page service manual. Sections in this service manual cover:

• General Information:
  Includes tractor identification, specifications, tune-up and adjustments, fuel, and lubricants.

• Engine:
  Explains engine analysis, diagnosing malfunctions, and the complete service of all engine components.

• Fuel System:
  Discusses diagnosing malfunc- tions, plus service of the carburetor, air clean- er, sediment bowl, fuel strainer, and gas tank.

• Electrical System:
  Provides wiring diagrams, testing, and diagnostic procedures, as well as service instructions for the electric starter, magneto ignition, and charging circuits.

• Power Train:
  Includes service information on the clutch, brake, power take-off, and transmission.

• Miscellaneous:
  This section covers the steering linkage, front wheels and axle, equipment lift linkage, and service procedures to perform on the 34 Rotary Mower.

Fill in the order form below and include it with your check or money order.

ORDER FOR SERVICE MANUAL

60 and 70 Lawn Tractors
John Deere Service Publications John Deere Road Moline, Illinois 61265

*Price includes postage, handling, and tax.

Please send me the following:

• Ship To ___
• Name__
• Address__
• Town ___
• State__
• Zip__

nobody can fill them like you can!
That’s what the owner of this pair of shoes is finding out the hard way. Through a careless action, he has become the victim of an accident. It’s a mighty tough way to find out that nobody else can wear your shoes or practice safety for you. And a needless, costly lesson to learn that safety is an everyday need. Put safety into each of your workdays; read the operator’s manual thoroughly; know how to operate each machine properly and safely; take the safety precautions specified; and think before you act. Make sure you wear your “shoes” every day. Outfit yourself with a safety program now.

Dependable John Deere Parts and Service
From Your John Deere Consumer Products Dealer

Your John Deere Consumer Products dealer is ready to serve you with dependable parts and service. His well-stocked shelves of Genuine John Deere Parts will keep your equipment on the go. He has servicemen with the know-how to keep your equipment running smoothly. You can trust your dealer to meet your needs. It’s part of the satisfaction you can expect from John Deere.

Litho in U.S.A.

Documents / Resources

| JOHN DEERE OM-M44250 70 Lawn Tractor [pdf] Instruction Manual
OM-M44250 70 Lawn Tractor, OM-M44250, 70 Lawn Tractor, Lawn Tractor, Tractor
---|---

References

• Manual-Hub.com – Free PDF manuals!

Read User Manual Online (PDF format)

Download This Manual (PDF format)

Download this manual  >>