CHAPIN 4G/ 15L BACKPACK Sprayer User Manual

BACKPACK SPRAYER
Use and Care Manual
DO NOT RETURN THIS
SPRAYER TO STORE
Call: 1-800-950-4458
www.chapinmfg.com

4G/ 15L BACKPACK Sprayer

4G/ 15L

Chapin International, Inc
P.O. Box 549 700 Ellicott St.
Batavia, NY 14021-0549 U.S.A.
1-800-950-4458 www.chapinmfg.com

WARNING
Carefully Read These Instructions Before Use

WARNING

WARNING: IMPROPER USE OR FAILURE TO FOLLOW INSTRUCTIONS CAN RESULT IN EXPLOSIVE FAILURE CAUSING SERIOUS EYE OR OTHER INJURY.
For safe use of this product, you must read and follow all instructions. Do not leave a pressurized sprayer in the hot sun. Heat can cause pressure build- up resulting in a possible explosion. Do not store or leave the solution in the tank after use. Always wear goggles, gloves, a long-sleeve shirt, long pants, and full foot protection when spraying. Never use any tool to remove the pump if there is pressure in the pressure chamber. Never pressurize the sprayer by any means other than the original pump. Do not attempt to modify this sprayer. Replace parts only with the manufacturer’s original parts.
Never spray flammable, caustic, acidic, chlorine, bleach or other corrosive solutions or heat, pressure, or gas-producing chemicals. Always read and follow the chemical manufacturer’s instructions before use with this sprayer as some chemicals may be hazardous when used with this sprayer. SK 1158-1

CAUTION

• PRE-USE CHECK: Before each use check tightness of the hose nut to be sure the hose is securely attached to the shut-off assembly. Ensure the hose is securely attached to the tank by tightening the hose clamp if necessary. Ensure that all nozzle and wand connections are tight. Insure the large pump clamp is tight. Insure the 2 bolts used to attach the pump lever to the pump shaft are tight.
• Do Not exceed a tank solution temperature of 120º F/ 49º C.

NOTE: The tank and hose may have residual water in it due to quality testing performed on the sprayer.

APPLICATIONS & USE FOR YOUR SPRAYER

Avoid using a sprayer for general cleaning purposes if plant protection or herbicide chemicals have already been used in the sprayer. If a sprayer has been used for plant protection or as an herbicide, clean the sprayer completely (see cleaning section) before using.
Plant Food: Use different spray patterns for optimum foliage feeding or for fungicide and pesticide application. Herbicides: Reduce weeds and unwanted plants but avoid using the same sprayer for plant feeding or protection without thoroughly cleaning (see cleaning section) the sprayer first. General Household Use: Apply detergents, cleaning solutions, warm water (do not exceed 120°F/49°C) or nontoxic household cleaning chemicals for carpets, floors, walls, glass, countertops and ceilings. DO NOT use a sprayer that has been used with herbicides, pesticides or other toxic chemicals for household applications. General Outdoor Use: Use the sprayer for cleaning windows or with a detergent for general-purpose cleaning.

SPRAYER COMPONENTS & USE INFORMATION

NOZZLE ASSEMBLY
Figure 1
Unscrew the nozzle cap (1) from the nozzle body (3) with retaining nut (2) fastened tightly to the elbow (5). Unscrew the retaining nut (2). Push the nozzle body (3) with the nozzle gasket (4) out of the retaining nut (2). To reinstall the nozzle, reverse the above instructions.

WAND ASSEMBLY

1. Make sure the O-ring is installed on the end of the wand. Insert the wand into the shut-off valve.
2. Turn and tighten the retaining nut clockwise onto the shut-off valve.

INSTALLING THE PUMP HANDLE

The pump handle can be mounted on either side of the pump shaft (A). To install the pump handle place the handle (C) over the shaft (A) aligning the pump handle hole and shaft hole. Push the straight side of the R-clip (B) through the aligned hole as shown in figure 1 thru 3.

INSTALLING THE SHOULDER STRAP
The top of the shoulder straps is attached to the tank. Attach the lower end of the straps by clipping the strap hooks to the metal frame between where the frame exits the tank and curves around.

3 STAGE FILTERING SYSTEM
This backpack sprayer is equipped with a 3 stage filtering system (see figure 1). Stage 1 is a filter basket incorporated into the tank opening where fluid is added. Stage 2 is a removable filter integrated into the pressure chamber. Stage 3 is a removable filter incorporated into the shut-off assembly. Periodic cleaning of these filters is recommended to insure consistent fluid flow through the sprayer. This will also reduce sprayer component wear.
Stage 2 filter cleaning requires the removal of the entire pump assembly (see section “disassembling and repairing the pump assembly”). Once the pump assembly is removed the stage 2 filter can be removed for cleaning (see figure 2).

The stage 3 filter is a removable filter incorporated into the inlet side of the shut-off valve (see section “disassembling and repairing the shut-off valve”) . Make sure pressure is released before detaching the hose from the shut-off. It is best to have no or minimal fluid in the pressure chamber before removing and reinstalling the stage 3 shut-off filter as fluid can leak from the hose.

It is best to have no or minimal fluid in the pressure cylinder before removing and reinstalling the stage 3 shut-off filter as fluid

FILLING THE SPRAYER

Make sure the filter basket is in place to keep debris from entering the tank.
Determine the amount of mixture needed for your application. Add the proper amount of water to the tank. Add the proper amount of chemicals to the tank (check the chemical label for the proper ratio of chemicals). Stir the mixture in the tank with a clean utensil (like a paint stirrer). The tank will hold the 4-gallon (15.1L) capacity plus the chemical.
It is not necessary to completely fill the sprayer tank with each use. You can fill the tank with only the amount needed for each application.
Always follow the manufacturer’s instructions included on their product label.

HELPFUL SPRAYING INFORMATION

Use RAPID pump strokes to prime the pump. You will know the pressure chamber is filling with liquid when you feel firm resistance from the pump. The air in the pressure chamber is compressed from repeated strokes. By pressing the hand lever on the shut-off, the valve opens. For the safety lock-off feature (no- spraying), pull up on the handle and move the red locking mechanism into the lock-off position as shown in fig. 1. To disengage, pull up on the handle and return the red locking mechanism to the neutral position as in fig. 3. For the lock-on feature (continuous spraying), push down on the handle and move red locking mechanism into the locked position as shown in fig. 2. To disengage, push down on the handle and return the red locking mechanism to the neutral position as shown infig. 3.

For easy pump action use the END of the pump handle. The amount of liquid delivered during spraying depends on the rate of the pump stroke. The fan nozzle tip is rated at .4 gpm at 40psi. This is the nominal operating pressure of the sprayer.
Note: If you experience a rapid drop in pressure, drain the sprayer completely and pump the handle with an empty tank. The pressure chamber will fill with the required volume of air to repressurize. Perform this procedure from time to time as routine maintenance.
POWDER-BASED CHEMICALS
Powder-based chemicals (powder mixed with liquids to make the spraying agent) are usually abrasive and can cause wear. When you use a powder-based chemical in your sprayer, make sure it is thoroughly dissolved in the liquid solution. Thoroughly clean and flush the sprayer with water to extend the life of the sprayer’s parts.
CLEANING

1. Always empty the sprayer and clean the tank thoroughly after each use.
2. Pump the sprayer handle until all of the contents and air exit through the nozzle (minimum of 30 strokes).
3. Fill the tank halfway with water and pump the water out as explained in step 2 (repeat several times as necessary).

Other Cleaning Hints:

• Improper spray distribution usually means the nozzle is clogged, remove the nozzle and clean it.
• Soap can be added to the water to clean the tank.
• Do not use strong cleaning agents or abrasives.
• If you use a chemical agent to clean the tank follow the manufacturer’s recommendations for the disposal of the wastewater.
• Follow the chemical manufacturers’ instructions for clean up.

STORING / MAINTAINING YOUR SPRAYER

• The sprayer should be stored out of direct sunlight in a cool dry space.
• Before freezing weather make sure to drain all liquid in the tank, pump, pressure cylinder, hose, shut-off valve, wand, and nozzle, to avoid liquid expansion and cracking in the sprayer components (See “Cleaning” section). Lock the shut-off valve in the “open” position.
• When service is required call your nearest dealer and always insist on original manufactured replacement parts.
• Inspect the hose, wand, pump, tank, and shut-off valve for wear, damage, or leaks on a regular basis and repair defects promptly.

TROUBLE SHOOTING YOUR SPRAYER

Little or no resistance during repeated pumping – no
pressure.| Damaged/worn/dirty/upper and or lower valve plate| Clean or Replace Valve Plate
Damaged /worn upper o-ring on the piston| Replace 0-ring
Piston Collar or piston-cylinder assembly is worn| Replace Collar or Piston cylinder assembly
Too much resistance after just a few pumping strokes but the pressure only lasts briefly.| Not enough air cushion in the pressure chamber| Release pressure in the pressure chamber. Remove the hose B drain pressure chamber. Reconnect the hose.
Upper valve plate damaged/worn/dirty| Clean or replace the upper valve plate
Upward pumping action is more difficult and/or the pump handle moves back down.| A vent hole is clogged| Clear the vent hole in the cap.
Lower valve plate sticks| Clean or replace the valve plate
Clogged filter| Clean in-tank filter
Piston cylinder intake clogged| Clean piston cylinder intake
When the handle is pulled up it moves back down| Valve Plate sticking| Clean or replace valve plate
Leaks at Piston Cylinder| Damaged/worn/Dirty Collar| Clean or Replace Piston Collar
Damaged Piston Cylinder| Replace Piston Cylinder
Damaged Piston| Replace Piston
Shut-off leaks| Connections loose| Tighten connection.
Worn or damaged shut-off| Rebuild or replace the shut-off valve.
Wand assembly leaks| Connections loose| Tighten connection.
Damaged or worn o-ring/gasket| Replace the o-ring/gasket.
Nozzle assembly leaks| Connections loose| Tighten connection.
Damaged or worn o-ring/gasket| Replace the o-ring/gasket.
Leak between the pump assembly and the tank| Pump clamp loose| Tighten clamp.
0-ring worn or damaged| Replace pressure chamber o-ring.
Hose leaking at the tank outlet| Hose clamp loose| Tighten clamp.
Hose leaking at shut-off| Connection loose| Tighten retaining nut.
Damaged or worn o-ring/gasket| Replace the o-ring/gasket.

DISASSEMBLING AND REPAIRING THE PISTON PUMP

1. Remove the cotter pin and pump handle. With the pump facing towards you lay the unit on its back (Figure 1). Loosen the hose clamp and remove the sprayer hose. Caution: There could be residual liquid in the hose and pressure cylinder. Remove the nut and bolt from the protective cap and remove the cap (ref: figure 9). Rotate the pump shaft in order to reach two lever bolts(A). Using an Allen wrench, remove the lever bolts. Pull the piston assembly (B) out of the piston cylinder (C).

2. Remove the piston cylinder assembly by turning the piston cylinder counter-clockwise when viewing the sprayer from the bottom. Caution: The piston cylinder may have sharp edges.

3. Check for vertical scratches on the inside of the piston cylinder and the piston. If one or both are scratched replace them.

4. To replace the collar, push it off of the crown of the piston with your thumb. You will see form fitted slots to install the new collar onto the piston crown.

5. There are 2 valve plates on the piston cylinder, one on the inside of the cylinder and one on the outside top. The valve plates are held in place with a screw and washer and can be removed and replaced using a Phillips head screwdriver. The 2 o-rings can be removed and replaced as well. Insure that the o-rings are positioned in the o-ring grooves in the piston cylinder.

6. Grease the 2 O-rings on the piston cylinder (do not get any grease on the valve plate) and screw the piston assembly into the pressure cylinder base. Screw the piston cylinder clockwise until tight and the bottom O-ring is no longer visible. When properly placed, the tab on the piston cylinder will line up with the rib on the pressure cylinder base.

7. Apply Petroleum jelly to the inside of the piston cylinder wall and on the collar, and reinstall the piston assembly into the piston cylinder.

8. Insert the piston at an angle with the leading edge of the collar placed over the slot in the piston cylinder. Bolt the piston assembly to the pump shaft using the lever bolts.

9. Replace the protective dust cap. Tighten the nut and bolt. Reinstall the pump handle. Replace the hose and firmly secure the hose clamp in place.

DISASSEMBLING AND REPAIRING THE PUMP ASSEMBLY

1. Release the pressure from the sprayer and remove all liquid from both the pressure chamber and tank.

2. Remove hose.

3. Remove 2 bolts attaching the pivot lever to the pump shaft and remove the piston assembly (fig. 2a & 2b).

4. Remove the large clamp holding the pressure chamber and tank together (fig 1).

5. Rock the pressure chamber back and forth and push down to free it from the tank (fig 1).

6. Once freed the entire pump assembly can be removed by maneuvering it through the base frame (fig 3a & 3b).
   

7. The pressure chamber o-ring can also be replaced. DO NOT stretch the o-ring over the bottom flange. Assemble the o-ring over the top of the chamber. Apply petroleum jelly to the o-ring before reinstalling the pump assembly into the tank (fig. 3b).

8. Reassemble backward from steps 6 thru 2, performing each step in reverse. Note: there is a notch/tab combination in the pump assembly/tank to be used for alignment (fig. 4).

DISASSEMBLING AND REPAIRING THE SHUT-OFF VALVE

1. Assembled shut-off valve (Figure 1).

2. Remove the retaining pin (A) (Figure 2) place the notched end of the retaining pin on a hard surface and push down. Remove the retaining pin and slide the handle off the valve.

3. Remove the retaining nut (o-ring attached), spring, and valve stem (B) (Figure 3). Replace worn parts. Lubricate the O-rings and reassemble by reversing the steps above. Place the handle groove in the slotted area of the valve stem and make sure the locking clip is positioned in the neutral position (see “Helpful Spraying Information” section). Insert the retaining pin. Push down on the handle a few times to distribute the lubricant evenly. Check filter (C) at the end of the shut-off valve for debris. Remove filter and flush with water to clean out.
   .

REPLACEMENT PARTS ORDER INFORMATION

Congratulations!
You have just purchased a quality Chapin product.
Register Your Sprayer Online@ www.chapinmfg.com/warranty.asp

Chapin International, Inc
P. O. Box 549 700 Ellicot St. • Batavia, NY 14021-0549 U.S.A. • 1-800-950-4458 • www.chapinmfg.com
Due to our ongoing product improvement process, product specifications may change without notice. U.S. and foreign patents pending.
Chapin International, Inc
P.O. Box 549 700 Ellicott St.
Batavia, NY 14021-0549 U.S.A.
1-800-950-4458 www.chapinmfg.com

References

• Chapin International: Sprayers, Spreaders, Industrial, Irrigation

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