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 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.
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
WARNING
12
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6. Reassemble the valves by reversing the steps above.
Repacking the Fluid Section
1. Remove the foot valve assembly using the steps in the
“Servicing the Valves” procedure above.
2. Using a 3/8” 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.
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.
CAUTION
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
facing down.
O-Ring
Raised Lip
Beveled Edge
Install lower packing
with the beveled
edge facing up.
Slider
Assembly
Retainer
Nut
Piston
Guide
Upper
Packing
Pump
Block
Lower
Packing
Pump Block
Mounting
Screw
Piston Rod
T-Slot
NOTE: The outlet valve does not need to be
disassembled from the piston rod for this
procedure.
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.).
