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Servicing the Fluid Section

Use the following procedures to service the valves and repack
the fluid section. Perform the following steps before
performing any maintenance on the fluid section.

1. Loosen and remove the four front cover screws. Remove

the front cover.

2. Stop the sprayer at the bottom of its stroke so that the

piston is in its lowest position.

3. Perform the Pressure Relief Procedure and unplug the

sprayer.

Before proceeding, follow the Pressure Relief
Procedure outlined previously in this manual.
Additionally, follow all other warnings to reduce
the risk of an injection injury, injury from moving
parts or electric shock. Always unplug the
sprayer before servicing!

4. For High Rider cart units, remove the return hose from the

hose clip on the siphon tube. Unscrew the siphon tube
from the foot valve housing.

5. For Skid and Low Rider units, unscrew the return hose

assembly from the pump block. Remove the retaining clip
from the bottom of the foot valve housing. Remove the
siphon assembly.

6. Tilt the sprayer back for easy access to the fluid section.

Servicing the Valves

The design of the fluid section
allows access to the foot valve and
seat as well as the outlet valve and
seat without completely
disassembling the fluid section. It
is possible that the valves may not
seat properly because of debris
stuck in the foot valve seat or outlet
valve seat. Use the following
instructions to clean the valves and
reverse or replace the seats.

1. Using a wrench, loosen and

remove the foot valve housing
from the pump block.

2. Clean out any debris in the

foot valve housing and
examine the valve housing and
seat. If the seat is damaged, reverse or replace the seat.

3. Using a 5/16” hex wrench, loosen and remove the outlet

valve retainer from the piston rod.

4. Clean out any debris and

examine the outlet valve housing
and seat. If the seat is damaged,
reverse or replace the seat.

5. Remove, clean, and inspect the outlet cage, crush

washer, and outlet valve ball. Replace if they are worn or
damaged.

6. Reassemble the valves by reversing the steps above.

NOTE: During reassembly of the outlet valve, apply

one drop of Loctite (included in the repacking
kit) to the threads of the outlet valve retainer
before threading it into the piston rod. Then,
torque the retainer to 144 in./lbs. (12 ft./lbs.).

NOTE: The outlet cage always must be used with the

crush washer. They are included together in
the repacking kit as assembly P/N 704-642.

NOTE: Always service the

outlet valve with the
piston rod attached to
the pump. This will
prevent the piston rod
from rotating during
disassembly of the
outlet valve.

Outlet Valve

Retainer

Outlet Valve

Seat

Outlet Valve

Ball

Outlet Cage

Crush

Washer

Piston Rod

Foot Valve

Housing

Foot Valve

Seat

Foot Valve

Ball

Bushing

Teflon
O-Ring

Inlet Cage

Foot Valve

Seal

Pump Block

Repacking the Fluid Section

1. Remove the foot valve assembly using the steps in the

“Servicing the Valves” procedure above.

2. Using 3/8” a hex

wrench, loosen and
remove the two pump
block mounting
screws.

3. Pull the pump block

down approximately
1/2” from the pump
housing.

4. Slide the pump block

and piston rod
forward until the
piston rod is out of
the T-slot on the
slider assembly.

5. Slide the piston rod

out through the
bottom of the pump
block

6. Loosen and remove

the retainer nut and
piston guide from the
pump block.

7. Remove the upper

and lower packings
from the pump block.

8. Clean the pump block

and install the new upper and lower packings. Refer to
the illustration below for proper packing orientation.

9. Inspect the piston rod for wear and replace if necessary.

10. Reassemble the outlet valve assembly into the piston rod.

Tighten the outlet valve retainer with a wrench until secure.

IMPORTANT: Never use a wrench on the piston itself.
This could cause damage to the piston and cause leakage.

11. Insert the piston guide into the retainer nut. Thread the

retainer nut into the pump block until it is hand tight.

12. Slide the piston guide tool (included in the repacking kit)

over the top of the piston rod and insert the piston rod
through the bottom of the pump block. Using a rubber
mallet, tap the bottom of the piston rod lightly until the
piston rod is in position in the pump block.

13. Using a wrench, tighten the retainer nut securely.
14. Slide the top of the piston rod into the T-slot on the slider

assembly.

15. Position the pump block underneath the pump housing

and push up until it rests against the pump housing.

16. Thread the pump block mounting screws through the

pump block and into the pump housing. Tighten securely.

NOTE: Coat the piston guide tool and the piston rod

with grease before inserting them into the
pump block.

NOTE: Use the T-slot on the slider assembly to hold

the piston rod in position while securing the
outlet valve retainer.

Install upper packing

with raised lip and O-ring