KOHLER KT610-KT620 6000 Series Engine Owner’s Manual

: June 3, 2024
: Kohler

KOHLER KT610-KT620 6000 Series Engine Owner’s Manual

IMPORTANT:
Read all safety precautions and instructions carefully before operating equipment. Refer to operating instruction of equipment that this engine powers.

Ensure engine is stopped and level before performing any maintenance or service.

Warranty coverage as outlined in warranty card and on KohlerEngines.com.
Please review carefully as it provides your specifi c rights and obligations.

To maintain compliance with applicable emission regulations, exhaust system backpressure may not exceed limits which can be found on KohlerEngines.com. Search by Model No., then select Specs tab.

Kohler Engines has published CO2 values on KohlerEngines.com website.

Record engine information to reference when ordering parts or obtaining warranty coverage.

Engine Model
Specifi cation
Serial Number
Purchase Date

Safety Precautions

WARNING: A hazard that could result in death, serious injury, or substantial property damage.

CAUTION: A hazard that could result in minor personal injury or property damage.

NOTE: is used to notify people of important installation, operation, or maintenance information.

| WARNING
---|---
Explosive Fuel can cause ﬁres and severe burns.
Do not ﬁll fuel tank while engine is hot or running.
Gasoline is extremely ﬂammable and its vapors can explode if ignited.

Store gasoline only in approved containers, in well ventilated, unoccupied buildings, away from sparks or ﬂames. Spilled fuel

could ignite if it comes in contact with hot parts or sparks from ignition. Never use gasoline as a cleaning agent.

| WARNING
---|---
Carbon Monoxide can cause severe nausea, fainting or death.
Avoid inhaling exhaust fumes. Never run engine indoors or in enclosed spaces.
Engine exhaust gases contain poisonous carbon monoxide. Carbon monoxide is odorless, colorless, and can cause death if inhaled.
| WARNING
---|---
Accidental Starts can cause severe injury or death.
Disconnect and ground spark plug lead(s) before servicing.
Before working on engine or equipment, disable engine as follows: 1) Disconnect spark plug lead(s). 2) Disconnect negative (–) battery cable from battery.

| WARNING
---|---
Rotating Parts can cause severe injury.
Stay away while engine is in operation.
Keep hands, feet, hair, and clothing away from all moving parts to prevent injury. Never operate engine with covers, shrouds, or guards removed.
| CAUTION
---|---
Electrical Shock can cause injury.
Do not touch wires while engine is running.

| WARNING
---|---
Hot Parts can cause severe burns.
Do not touch engine while operating or just after stopping.
Never operate engine with heat shields or guards removed.

WARNING: This product can expose you to chemicals including carbon monoxide and benzene, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Overview

A| Air Cleaner Cover| B| Air Cleaner Cover Lever| C| Spark Plug| D| Oil Filter
---|---|---|---|---|---|---|---
E| Fuel Filter| F| Oil Fill/Dipstick| G| Debris Screen| H| Oil Drain Plug
I| Low-Proﬁle Air Cleaner (LPAC)| J| LPAC Element| K| Precleaner| L| Air Cleaner Base

M

| High Performance Air Cleaner|

N

| High Performance Element|

O

| PRO

Performance Air Cleaner

|

P

| PRO

Performance Element

Q| Bail|

Visit KohlerEngines.com for service parts information and purchasing options.

Pre-Start Checklist

Check oil level. Add oil if low. Do not overfi ll.
Check fuel level. Add fuel if low. Check fuel system components and lines for leaks.
Check and clean cooling areas, air intake areas and external surfaces of engine (particularly after storage).
Check that air cleaner components and all shrouds, equipment covers, and guards are in place and securely fastened.
Check spark arrestor (if equipped).

Starting

| WARNING
---|---
Carbon Monoxide can cause severe nausea, fainting or death.
Avoid inhaling exhaust fumes. Never run engine indoors or in enclosed spaces.
Engine exhaust gases contain poisonous carbon monoxide. Carbon monoxide is odorless, colorless, and can cause death if inhaled.
| WARNING
---|---
Rotating Parts can cause severe injury.
Stay away while engine is in operation.
Keep hands, feet, hair, and clothing away from all moving parts to prevent injury. Never operate engine with covers, shrouds, or guards removed.

Standard Choke System

● Above 32°F (0°C)

Refer to operating instructions of equipment this engine powers for specific starting instructions

32°F (0°C) and Below

Refer to operating instructions of equipment this engine powers for specifi c starting instructions.
Refer to Cold Weather Starting Hints within this manua

Smart-ChokeTM

Above 32°F (0°C)

This feature will automatically adjust engine choke on start up with throttle in any position.
If engine does not start on first attempt, wait 3-5 seconds and try again (if no start after third attempt wait 1 minute).
If engine does not consistently start by fifth attempt, consult Kohler authorized dealer for assistance.

32°F (0°C) and Below

This feature will automatically adjust engine choke on start up with throttle in any position (winter blend fuel is recommended).
If engine does not start on fi rst attempt, wait 5-10 seconds and try again (if no start after third attempt wait 1 minute).
If engine does not consistently start by fi fth attempt, consult Kohler authorized dealer for assistance.

eChokeTM

Above 32°F (0°C)

This feature will automatically make system adjustments to engine on start up with throttle in any position.
If engine does not start on fi rst attempt, wait 3-5 seconds and try again (if no start after third attempt wait 1 minute).
If engine does not start consistently by fi fth attempt, turn key to OFF, pause briefl y, and make another attempt. If engine does not start, consult Kohler authorized dealer for assistance.

32°F (0°C) and Below

This feature will automatically make system adjustments to engine on start up with throttle in any position (winter blend fuel is recommended).
If engine does not start on fi rst attempt, wait 3-5 seconds and try again (if no start after third attempt wait 1 minute).
If engine does not start consistently by fi fth attempt, turn key to OFF, pause briefl y, and make another attempt. If engine does not start, consult Kohler authorized dealer for assistance.

Cold Weather Starting Hints

Use proper oil for temperature expected.
Disengage all possible external loads.
Use fresh winter grade fuel. Winter grade fuel has higher volatility to improve starting. 4. Make sure battery has a full charge.

Stopping

If possible, remove load by disengaging all PTO driven attachments.
Position throttle control between half and full throttle; stop engine.
Do not allow engine/application to be left unattended with key ON (RUN position) for long periods. If left in such a condition, operator must turn key completely OFF before attempting a restart to reset system.

EN Angle of Operation

Refer to operating instructions of equipment this engine powers. Do not operate this engine exceeding maximum angle of operation; see specification table. Engine damage could result from insufficient lubrication.

Engine Speed

NOTE: Do not tamper with governor setting to increase maximum engine speed. Overspeed is hazardous and will void warranty

High Altitude Operation

If this engine is operated at an altitude of 4000 ft. (1219 meters) or above, a high altitude carburetor kit is required. To obtain high altitude carburetor kit information or to find a Kohler authorized dealer, visit KohlerEngines.com or call 1-800-544-2444 (U.S. and Canada).

This engine should be operated in its original configuration below 4000 ft. (1219 meters).

Operating this engine with the wrong engine confi guration at a given altitude may increase its emissions, decrease fuel effi ciency and performance, and result in damage to the engine.

Maintenance Instructions

| WARNING| Before working on engine or equipment, disable engine as follows: 1) Disconnect spark plug lead(s). 2) Disconnect negative (–) battery cable from battery.
---|---|---
Accidental Starts can cause severe injury or death.
Disconnect and ground spark plug lead(s) before servicing.

Normal maintenance, replacement or repair of emission control devices and systems may be performed by any repair establishment or individual; however, warranty repairs must be performed by a Kohler authorized dealer found at KohlerEngines.com or 1-800-544-2444 (U.S. and Canada).

Maintenance Schedule

Every 25 Hours¹

Service/replace precleaner.
Replace LPAC element (if not equipped with precleaner).

Every 50 Hours¹

Replace LPAC element (if equipped with precleaner).
Replace high performance air cleaner element (if not equipped with precleaner).

Every 75 Hours¹

Replace high performance air cleaner element (if equipped with precleaner).
Replace PRO performance air cleaner element (if not equipped with precleaner).

Every 100 Hours¹

Replace PRO performance air cleaner element (if equipped with precleaner).
Change oil and fi lter.
Remove cooling shrouds and clean cooling areas. Every 100 Hours
Check that all fasteners are in place and components are properly secured.
Replace fuel fi lter.

Every 300 Hours3

Change oil and fi lter (KOHLER PRO 10W-50 oil and KOHLER PRO fi lter only).

Every 500 Hours²

Have valve lash checked/adjusted.

Every 500 Hours

Replace spark plugs and set gap.

Perform these procedures more frequently under severe, dusty, dirty conditions.
Have a Kohler authorized dealer perform this service.
Option only if using KOHLER® PRO oil and PRO filter.

Oil Recommendations

All-season KOHLER® PRO 10W-50 Synthetic Oil is the ideal oil for KOHLER engines. It is specifically formulated to extend the oil and oil fi lter change interval to 300 Hours when paired with a KOHLER PRO Extended Life Oil Filter.

300-Hour oil and oil filter change intervals are exclusive to and only authorized on KOHLER engines that utilize both the KOHLER PRO 10W-50 Synthetic Oil and KOHLER PRO Extended Life Oil Filter. Alternative engine oils and oil filters may be used with KOHLER engines but require 100-Hour oil and oil filter change intervals for proper maintenance. Oil must be API (American Petroleum Institute) service class SJ or higher. Select viscosity based on air temperature at time of operation as shown below.

Check Oil Level

NOTE: To prevent extensive engine wear or damage, never run engine with oil level below or above operating range indicator on dipstick.

Ensure engine is cool. Clean oil fi ll/dipstick areas of any debris.

Remove dipstick; wipe oil off .
Reinsert dipstick into tube; press completely down.
Remove dipstick; check oil level. Level should be at top of indicator on dipstick.
If oil is low on indicator, add oil up to top of indicator mark.
Reinstall and secure dipstick.

Change Oil and Filter

Change oil while engine is warm.

Clean area around oil fi ll cap/dipstick. Remove drain plug and oil fi ll cap/dipstick. Allow oil to drain completely.
Clean area around oil fi lter. Place a container under fi lter to catch any oil and remove fi lter.
Wipe off mounting surface. Reinstall drain plug. Torque to 10 ft. lb. (13.6 N·m).
Place new fi lter in shallow pan with open end up. Fill with new oil until oil reaches bottom of threads. Allow 2 minutes for oil to be absorbed by fi lter material.
Apply a thin fi lm of clean oil to rubber gasket on new filter.
Refer to instructions on oil fi lter for proper installation.
Fill crankcase with new oil. Level should be at top of indicator on dipstick.
Reinstall oil fi ll cap/dipstick and tighten securely.
Start engine; check for oil leaks. Stop engine; correct leaks. Recheck oil level.
Dispose of used oil and fi lter in accordance with local ordinances.

Oil Sentry™ (if equipped)

This switch is designed to prevent engine from starting in a low oil or no oil condition. Oil Sentry™ may not shut down a running engine before damage occurs. In some applications this switch may activate a warning signal. Read your equipment manuals for more information.

Fuel Recommendations

| WARNING
---|---
Explosive Fuel can cause ﬁres and severe burns.

Do not ﬁll fuel tank while engine is hot or running.

Gasoline is extremely ﬂammable and its vapors can explode if ignited. Store gasoline only in approved containers, in well ventilated, unoccupied buildings, away from sparks or ﬂames. Spilled fuel could ignite if it comes in contact with hot parts or sparks from ignition. Never use gasoline as a cleaning agent.

NOTE: E15, E20 and E85 are NOT approved and should NOT be used; eff ects of old, stale or contaminated fuel are not warrantable.

Fuel must meet these requirements:

Clean, fresh, unleaded gasoline.
Octane rating of 87 (R+M)/2 or higher.
Research Octane Number (RON) 90 octane minimum.
Gasoline up to 10% ethyl alcohol, 90% unleaded is acceptable.
Methyl Tertiary Butyl Ether (MTBE) and unleaded gasoline blend (max 15% MTBE by volume) are approved.
Do not add oil to gasoline.
Do not overfi ll fuel tank.
Do not use gasoline older than 30 days

Fuel Line

Low permeation fuel line must be installed on carbureted Kohler Co. engines to maintain EPA and CARB regulatory compliance.

| CAUTION
---|---
Electrical Shock can cause injury.

Do not touch wires while engine is running.

Clean out spark plug recess. Remove plug and replace.

Check gap using wire feeler gauge. Adjust gap, see specifi cation table for adjustment.
Install plug into cylinder head.
Torque plug to 20 ft. lb. (27 N·m)

Air Cleaner

NOTE: Operating engine with loose or damaged air cleaner components could cause premature wear and failure. Replace all bent or damaged components.
NOTE: Paper element cannot be blown out with compressed air.
Rotate air cleaner cover levers outward to unlock cover; remove air cleaner cover. or Move bails on air cleaner cover up; remove latches from cover; remove cover.

Precleaner (if equipped):

Remove precleaner from paper element.
Replace or wash precleaner in warm water with detergent. Rinse and allow to air dry.
Lightly oil precleaner with new engine oil; squeeze out excess oil.
Reinstall precleaner over paper element.

Paper Element:

Remove element from base; service precleaner. Discard element.
Install precleaner over new paper element and install on base.
Position air cleaner cover with levers outward over air cleaner; turn levers inward to lock. or Reinstall cover; place latches onto cover; pull down bails to secure cover.

Breather Tube

Ensure both ends of breather tube are properly connected.

Air Cooling

| WARNING
---|---
Hot Parts can cause severe burns.

Do not touch engine while operating or just after stopping.

Never operate engine with heat shields or guards removed.

Proper cooling is essential. To prevent over heating, clean screens, cooling fins, and other external surfaces of engine. Avoid spraying water at wiring harness or any electrical components. See Maintenance Schedule.

Repairs/Service Parts

We recommend that you use a Kohler authorized dealer for all maintenance, service, and engine parts. To fi nd a Kohler authorized
dealer visit KohlerEngines.com or call 1-800-544-2444 (U.S. and Canada).

Storage

If engine will be out of service for 2 months or more follow procedure below.

Add KOHLER PRO Series fuel treatment or equivalent to fuel tank. Run engine 2-3 minutes to get stabilized fuel into fuel system (failure due to untreated fuel are not warrantable).
Change oil while engine is still warm from operation (NOT required if using KOHLER PRO 10W-50 full-synthetic oil). Remove spark plug(s) and pour about 1 oz. of engine oil into cylinder(s). Replace spark plug(s) and crank engine slowly to distribute oil.
Disconnect negative (–) battery cable.
Store engine in a clean, dry place.

Troubleshooting

Do not attempt to service or replace major engine components, or any items that require special timing or adjustment procedures. This work should be performed by a Kohler authorized dealer.

	Possible Cause
Problem	No Fuel
Incorrect Oil Level	Engine Overloaded
Will Not Start	●
Hard Starting
Stops Suddenly	●
Lacks Power
Operates Erratically
Knocks or Pings
Skips or Misﬁres
Backﬁres
Overheats
High Fuel Consumption

Engine Speciﬁcations

*Exceeding maximum angle of operation may cause engine damage from insuffi cient lubrication.
**KT740 engines with PRO Performance Air Cleaner have 45.6 cu. in. (747 cc) Displacement.
Additional specifi cation information can be found in service manual at KohlerEngines.com.
Any and all horsepower (hp) references by Kohler are Certifi ed Power Ratings and per SAE J1940 & J1995 hp standards. Details on Certifi ed Power Ratings can be found at KohlerEngines.com.

Emission Control System

Exhaust Emission Control System for models KT610-KT620, KT715-KT745 is EM for U.S. EPA, California, and Europe.

NOTE: Tampering with the engine and its emission control system voids the EPA Certifi cate of Conformity, ARB Executive Order, and EU type-approval.