20 309941
Displacement Pump Replacement
See manual 310643 for pump repair instructions.
See manual 309943, 309944 or 309951 – 309954 for
applicable sprayer part number references.
Removal
1. Flush pump (13).
2.
Relieve pressure; page 5.
3. Fig. 8. Remove screw (31) and slide pump rod
shield (108) forward.
Fig. 8
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31
108
4. Fig. 10. Cycle pump in JOG mode until pump pin
(44) is in position to be removed. Turn power
switch OFF and unplug power cord. Push up
retaining ring (43) and push pump pin out.
5. Fig. 9. Remove suction tube (76), hose (94) and
any washers and o-rings.
6. Loosen pump jam nut (56). Unscrew pump.
Fig. 9
76
56
94
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Installation
WARNING
If pump pin works loose, parts could break off due
to force of pumping action. Parts could project
through the air and result in serious injury or prop-
erty damage.
CAUTION
If the pump jam nut loosens during operation, the
threads of the drive housing will be damaged.
1. Fig. 10. Extend pump piston rod 1.5 in. Apply
grease to top of pump rod at (A) or inside connect-
ing rod.
Fig. 10
1.5 in.
A
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44
43
2. Install pump pin (44). Verify retaining spring (43) is
in groove of connecting rod (85).
3. Push pump up until pump threads engage.
4. Screw in pump until threads are flush with drive
housing opening. Align pump outlet to back.
5. Fig. 9. Install washers, o-rings and suction tube
(76) and hose (94).
6. Fig. 11. Screw jam nut (56) up onto pump until nut
stops. Tighten jam nut by hand, then tap 1/8 to 1/4
turn with a 20 oz (maximum) hammer to approxi-
mately 75" 5 ft–lb (102 Nm).
Fig. 11
7. Fig. 8. Install pump rod shield (108) with screw
(31).
8. Fig. 12. Fill packing nut with Graco TSL until fluid
flows onto top of seal.
Fig. 12
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