Displacement Pump Replacement - Graco 390 Repair Manual

Displacement Pump Replacement

See manual 309250 for pump repair instructions.
Removal
WARNING
Read Injection Hazard Warning, page 3, Moving
Parts Hazard Warning, page 4 and Pressure Relief
Procedure, page 7.
1. Relieve pressure, page 7.
2. Loosen two screws (30) and rotate cover (44).
ti6104a
44
3. Loosen nut (A) and remove hose set (35). Loosen
nut (B) and remove the high pressure hose (14).
14
B
A
35
310824C
4. Cycle pump until pin (32) is in position to be
5. Disconnect power cord from outlet.
6. Using a flat screwdriver, push retaining spring (C)
30
7. Using a hammer, loosen pump jam nut (11).
ti6105a
Displacement Pump Replacement
removed.
up. Push out pump pin (32).
C
32
ti6106a
Unscrew and remove pump (9).
ti6107a
11
11
9
13