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Replacing the Hydraulic Pump
1. Follow the Pressure Relief Procedure Warning
on page 10. Let the hydraulic system cool before
beginning the service procedure.
2. Unscrew the reservoir drain plug (51, page 24),
having a container ready to catch the draining
fluid.
3. Disconnect the hose (7) from the bypass valve (9)
by loosening the hose clamp (8). See Fig 8.
4. Loosen the hose clamp (8) and pull the hose (85)
off the hose insert (5) near the elbow (3). See Fig
8.
5. Loosen the hose clamp (54) on the hose (53) just
above the hydraulic pump (107). See Fig 8.
6. Loosen the tube fitting nut (18) of hose (22). See
Fig 8.
7. Remove the two capscrews (150), lockwashers
(66) and washers (64) holding the pump (107) to
the support (117). See Fig 8.
8. Pull the pump straight off the pump support.
9. Loosen the setscrews (108) on the pump half of
the coupler (109). See Fig 9.
10. Remove all fittings from the old pump and install
them on the new pump in the same order.
11. Check Dimension A as shown in Fig 9. When the
dimension is correct, tighten the setscrews (108),
slide the new pump assembly onto the pump
support (117) and recheck the dimension.
CAUTION
The correct coupling dimension is critical to avoid
improper coupler engagement to the coupler spider
which will damage the coupler and make the sprayer
inoperable.
12. Reconnect the hoses. Reinstall the reservoir plug
(51, page 24)), and refill the reservoir with clean,
Graco approved hydraulic oil.
114
108
109
49,66
107
150,66,64
115
18
22
9
8
7
4
152
3
5
8
85
53
54
52
113
112
117
7876A
Fig 8