Displacement Pump Repair - Graco GM 5000 Instructions And Parts List

Removing and Installing the Pump
WARNING
To reduce the risk of serious injury, including fluid in-
jection always follow the Pressure Relief Procedure
Warning on page 14 before checking, adjusting,
cleaning or shutting off the sprayer. Disconnect the
spark plug!
Removing the pump
1. Flush the pump. Relieve pressure. See page 14.
2. Hold the intake valve (423) with a wrench and un-
screw the suction tube (30). Remove the hose (59).
For upright carts, remove the spring clips (112,114)
and drain hose (113).
3. Push the retaining spring (26) up. Push the pin (25)
out the rear.
4. Loosen the locknut (27). Unscrew the pump. See be-
low for how to repair the pump.
25
27
30
Fig. 26

Displacement Pump Repair

Disassembly procedure
1. Remove the pump from the sprayer. See above.
2. Disassemble the intake valve. See Fig. 28.
3. Clean and inspect the parts. Replace any worn or
damaged parts. Use a new o–ring (401* ). If no fur-
ther sevice is needed, reassemble the intake valve
and torque it into the cylinder to 110 ft–lb (146 N.m).
See Fig. 26.
26
59
112
113
114
0477
Installing the pump
1. Screw the pump about 3/4 of the way into the bearing
housing (21). Hold the pin (25) up to the pin hole on
the connecting rod (22) and continue screwing in the
pump until the pin slides easily into the hole.
2. Back off the pump until the top threads of the pump
cylinder are flush with the face of the bearing housing
and the outlet nipple faces back.
3. Push the retaining spring (26) into the groove all the
way around the connecting rod. Tighten the locknut
(27) to 90 ft–lb (110 N.m) using a 2 1/4 in. open end
wrench and a light hammer.
4. Install the front cover and screws. Connect the pump
outlet hose. Install the suction tube parts. For Upright
carts, install the spring clips and drain hose.
Face of bearing housing
Torque to 90 ft–lb (110 N.m)
25
22
26
Fig. 27
Torque to
110 ft–lb
(146 N.m)
*404
*401
423
Fig. 28
See Fig. 27.
21
27
0031
419
420
421*