Replacing the Slider Assembly and
Slider Housing
1. Start the engine (refer to the procedures in the Operation
section of this manual). Turn the pressure control knob
clockwise to its maximum pressure setting.
2. Toggle the sprayer ON/OFF switch between the ON and
OFF positions in short bursts until the slider assembly
stops in a position where the fluid section connecting pin
and retaining ring are visible through the slot in the slider
housing.
3. Turn off the engine and perform the Pressure Relief
Procedure.
4. Using a Phillips
screwdriver,
remove the four
front cover
screws. Remove
the front cover.
5. Slide the retaining
ring up on the
slider assembly to
expose the
connecting pin.
6. Push the
connecting pin
forward through
the slider
assembly and
piston. The
connecting pin
will fall out from
the rear window of the slider housing where it can be
retrieved.
7. Using a 7/8” open-end wrench, loosen and remove the
fluid hose from the fitting on the back of the fluid section.
8. Using a 2 1/4” wrench, loosen the fluid section jam nut.
Turn the fluid section counterclockwise by until it
disengages from the slider housing.
9. Using a 5/16” hex wrench, remove the four socket screws
and lock washers that secure the slider housing to the
pump housing.
10. Remove the slider housing and slider assembly by pulling it
straight out from the pump housing. The slider housing
assembly will disengage from the pump housing dowel pins
and the connecting rod will disengage from the crankshaft.
11. Remove the slider assembly from the slider housing by
grasping the bearing end of the connecting rod and lifting
it straight out from the slider housing.
12. Check the parts for wear.
a. If the slider housing bushing is scored or out of round it
should be replaced.
b. If the slider assembly is scored or the connection
between the connecting rod and slider assembly
exhibits movement other than pivoting movement, the
slider assembly should be replaced. The slider
assembly also should be replaced if the connecting rod
bearing shows signs of wear.
c. Any parts that will be reused should be cleaned
thoroughly, including the connecting rod. Also, clean the
crankshaft pin that the connecting rod bearing rides on.
d. If a new slider assembly will be used, remove the
retaining ring from the bottom of the old slider assembly
and slide it onto the new assembly so that it rests
above the connecting pin hole.
13. Lubricate the inside diameter of the slider housing and the
outside diameter of the slider assembly with oil. Fill the
slider cup with Lubriplate 3000W grease (the slider cup is
the area on the slider assembly where the connecting rod
and slider housing join and pivot).
14. Insert the slider assembly into the bushing end of the
slider housing.
Connecting
Pin
Fitting
Retaining
Ring
Slider
Assembly
Pump
Housing
Front
Cover
Screw
Slider
Housing
Jam Nut
Fluid
Section
Front
Cover
15. Hold the assembly up to the pump housing, lining up the
connecting rod with the crankshaft pin and the pump
housing dowel pins with their mating holes on the slider
housing. Slide the assembly onto the crankshaft pin and
pump housing dowel pins until the slider housing bottoms
out on the pump housing. Make sure the grease fitting on
the connecting rod is facing the open side of the pump
housing.
16. Install the the four socket screws and lock washers that
secure the slider housing to the pump housing. Tighten in
a diagonal pattern and torque to 400–440 in./lbs.
17. Lubricate the connecting rod bearing with Lubriplate 1242
grease by inserting the end of a grease gun onto the
grease fitting on the end of the crankshaft pin. Lubricate
the main housing bearing by inserting the end of a grease
gun onto the grease fitting in the center of the crankshaft.
Also, lubricate the connecting rod bushing by inserting the
end of a grease gun onto the grease fitting on the
connecting rod.
18. Position the front cover over the pump housing. Secure
the front cover using the four front cover screws.
19. Apply blue Loctite to the bottom 3–4 threads on the fluid
section cylinder.
20. Turn the fluid section jam nut clockwise until it is flush
against the top of the cylinder.
21. Lubricate the first several threads at the top of the cylinder
with anti-seize compound.
22. Thread the cylinder into the pump housing, turning
clockwise. When the connecting pin hole on the piston
rod lines up with the hole in the slider assembly, insert the
connecting pin.
23. Slide the retaining ring down on the slider assembly to
cover the connecting pin.
24. Continue to turn the cylinder clockwise until the jam nut is
flush against the slider housing.
25. Once the nipple is positioned, turn the jam nut clockwise
until it contacts the pump housing.
26. Tighten the jam nut with a wrench to tighten it against the
slider housing.
27. Using a 7/8” open-end wrench, attach the fluid hose to the
fitting on the back of the fluid section. Tighten securely.
NOTE: If the nipple on the cylinder does not face the
back of the unit, turn the cylinder
counterclockwise until the nipple faces the
back of the unit. Do not turn the cylinder more
than one full turn.
Crankshaft
Dowel Pin
Connecting Rod
Slider Housing
Socket Screw
Pump
Housing
Slider Housing
Slider Assembly
© SprayTECH. All rights reserved.
11
