Hydraulic Pump - Graco 310778N Repair Manual

Removal
WARNING
Relieve pressure; page 6.
Let hydraulic system cool before beginning service.
1. Place drip pan or rags under sprayer to catch hydraulic oil
that leaks out during repair.
2. Remove drain plug (40) and oil filter (47) and allow
hydraulic oil to drain.
3. Fig. 2. Disconnect suction tube (114).
4. Disconnect paint pump (111), page 15.
5. Remove screw (172), nut (173) and belt guard (117).
6. Raise motor and remove belt (44).
7. Remove two set screws (133) and fan pulley (96).
8. Remove case drain tube (97).
9. Remove elbow (22).
10. Remove tube (94) from elbow (37). Remove elbow (37)
from hydraulic pump (98).
11. Remove eight screws (27) reservoir cover (68) filter
assembly (46) and gasket (62).
12. Remove four screws (5) and hydraulic pump (98) from
reservoir cover (68).
8

Hydraulic Pump

Installation
1. Install hydraulic pump (98) to reservoir cover (68) with four
screws (5); torque 100 in-lb (11 N·m).
2. Install gasket (62) and reservoir cover (68) with eight
screws (27); torque 90 in-lb (10 N·m).
3. Install elbow (37) in hydraulic pump (98). Install elbow (37)
in tube (94). Torque to 15 ft-lb (20.3 N·m).
4. Install elbow (22); torque to 15 ft-lb (20.3 N·m).
5. Install case drain tube (97); torque to 25 ft-lb (33.9 N·m).
6. Install fan pulley (96) with two set screws (133).
7. Raise motor and install belt (44).
8. Install belt guard (117) with screw (172) and nut (173).
9. Connect paint pump (111), page 15.
10. Fig. 2. Connect suction tube (114).
11. Install drain plug (40); torque to 110 in-lb (12.4 N·m).
Install oil filter (47); tighten 3/4 turn after gasket contacts
base. Fill hydraulic pump with Graco hydraulic oil, page 6,
through elbow (22) port until full. Fill reservoir with
remaining hydraulic oil.
12. Start up and allow pump to operate at low pressure for
approximately 5 minutes to purge all air.
13. Check oil hydraulic oil and top off, if required.
Hydraulic Pump
310778N