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Servicing the Fluid Section

Use the following procedures to service the valves and repack
the fluid section.

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

the front cover.

2. Position the crankshaft/slider assembly at the bottom,

dead-center of its stroke so that the connecting pin and
retaining ring are visible below the slider assembly. This
is done by turning the sprayer on and off in short bursts
until the connecting pin is visible below the slider housing.

3. Turn off and unplug the unit.

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. Remove the return hose from the clamp on the siphon

tube.

5. Unscrew the siphon tube/suction set from the inlet valve.
6. Loosen and remove the high-pressure hose from the

nipple on the back of the cylinder of the fluid section.

7. Slide the retaining ring up on

the slider assembly to expose
the connecting pin.

8. Push the connecting pin

forward through the slider
assembly and piston. The
connecting pin will fall into a
recessed area of the gear box
housing where it can be
retrieved.

9. Using a wrench, turn the jam

nut counterclockwise to loosen
it from the gear box housing.

10. Turn the fluid section

counterclockwise to remove it
from the gear box housing.

11. Place the fluid section cylinder

upright in a vise by clamping on
the wrench flats.

12. Loosen and remove the inlet

valve housing from the
cylinder.

13. Remove the inlet valve cage,

inlet valve ball, inlet valve seat,
and o-ring from the inlet valve.

14. Clean out any debris in the

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

Inlet Valve

Housing

Viton
O-Ring

O-ring

PTFE

Back-Up

Ring

Inlet Valve

Seat

Inlet Valve

Ball

Inlet Valve

Cage

Cylinder

NOTE: Do not over-tighten the vise. Damage to the

cylinder may occur.

Retaining

Ring

Connecting

Slider

Assembly

Crankshaft

Jam Nut

Cylinder

WARNING

15. Using a wrench, remove the

upper seal retainer.

16. Slide the piston rod out

through the bottom of the
cylinder.

17. Inspect the piston rod for

wear and replace if
necessary.

18. Remove the upper support

ring, upper packings, upper
pressure ring, and upper
wave spring from the top of
the cylinder.

19. Remove the adapter, lower

packings, lower pressure ring,
and lower wave spring from
the bottom of the cylinder.

20. Remove the cylinder from the

vise.

21. Insert the connection pin

through the hole at the top of
the piston rod and clamp each
end of the connecting pin in
the vise. This will hold the
piston rod in position for
disassembly.

22. Using a 3/8” hex wrench,

loosen and remove the outlet
valve retainer from the piston
rod.

23. Remove the outlet valve seat,

nylon washer, outlet valve
ball, outlet valve cage, and
outlet valve seal from the
piston rod.

24. Clean out any debris and

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

25. Clean and inspect the outlet

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

26. Reassemble the outlet valve

assembly into the piston rod
in the reverse order of how it was disassembled. Torque
the outlet valve retainer to 12 ft. lbs.

27. Remove the piston rod from the vise.
28. Clean the cylinder. Inspect the cylinder for damage and

replace if necessary.