Graco GMax 3900 - Repair When Pump Is Off The Sprayer

4 308-798
Service
Repair When Pump Is Off The Sprayer
Disassembling the pump
Fig. 23. Remove packing nut (202) and throat adjust-
ment spacer (228).
Fig.
23
7568A
202
228
Fig. 24. Unscrew intake valve from cylinder.
Fig.
24
7569A
Fig. 25. Disassemble intake valve. Clean and inspect.
O-ring (227) may require a pick for removal.
7570A
Fig.
25
227
Fig. 26. Tap piston rod out of cylinder with a hammer
or flip over and tap piston rod out against a bench.
Note: Sleeve may come out of cylinder with piston rod.
Fig.
26
7571a
Fig. 27. Remove piston rod from sleeve, or remove
sleeve from cylinder.
Fig. 27
7572A