Replacing the Hydraulic Pump
1.Follow the Pressure Relief Procedure Warning on page 8. Let the hydraulic system cool before beginning the service procedure.
2.Unscrew the reservoir drain plug (7), having a con- tainer ready to catch the draining fluid.
3.Disconnect the hydraulic inlet hose (92) from the 90° swivel union (45) at the motor and from the tee (54).
4.Disconnect the bypass hose (85) from the ball valve
(84).
5.Remove the four nuts (27) from the seal plate (160) on the reservoir cover (90).
6.Remove the two screws (8), lockwashers (11) and washers (98) holding the hydraulic pump (70).
7.Pull the pump away and loosen the setscrews (38a) on the pump half of the coupler (38).
8.Raise the pump and turn it to unthread the inlet filter (21) which is in the oil reservoir.
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9.Be sure the new hydraulic pump has the same part number as the old one. Check the numbers stamped on the pumps to verify them.
10.Remove all fittings from the old pump and install them on the new pump in the same order.
11.Install the new pump, being sure to connect the in- let filter (21) to the bottom of the pump.
12.Check Dimension A as shown in Fig 15. When the dimension is correct, tighten the setscrews (38a).
r-------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.
13.Reconnect the hoses. Reinstall the reservoir plug (7), and refill the reservoir with clean, Graco- approved hydraulic oil.
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Fig 14 ___________________________________
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