Displacement Pump Service - Graco HydraSprayr 230975 Instructions Manual

Displacement Pump Service

Disconnect the Displacement Pump
1. Flush the pump if possible. Stop the pump on the
down stroke.
2. Follow the Pressure Relief Procedure Warning
on page 10.
3. Remove the suction tube and fluid hose from the
displacement pump.
4. Unscrew the three tie rod locknuts (48). See
GH733 Sprayer Parts Drawing.
5. Unscrew the shouldered nut (35). Pull the
displacement pump (46) off the tie rods (47).
6. Screw the jam nut (90) up onto the connecting rod
(91).
7. Remove the lower cotter pin (89) and unscrew the
connecting rod (91) from the displacement rod (A).
8. Refer to separate manual 311762 for displacement
pump repair instructions.
16 307616
Reconnecting the Displacement Pump
1. Screw the connecting rod (91) into the displace-
ment rod (A) and replace the lower cotter pin (89).
Screw the jam nut (90) all the way down. See
GH733 Sprayer Parts Drawing.
2. Mount the displacement pump (46) onto the tie
rods (47).
3. Screw the shouldered nut (35) onto the hydraulic
motor (29). Screw the tie rod locknuts (48) onto
the tie rods (47) and torque to 35–50 ft-lb (47–68
N.m).
4. Reattach the hoses to the displacement pump.
5. If the grounding wire was disconnected before
service, be sure to reconnect it before operating
the sprayer.
6. Start the pump and operate it slowly to check the
tie rods for binding. Adjust the tie rod locknuts, if
necessary to eliminate binding.