Graco PR70 Repair And Parts Manual page 34

Repair
6. Remove the shroud (117, 214). See F
page 42 and F . 21 on page 48.
IG
Disassemble the Rear Pump Assembly
7. Disconnect the pump shaft (511) from the drive
block.
a. Loosen the shaft locking nut (502).
b. Hold the drive block alignment rod (2302, 2419)
stationary with a wrench. See F
45 and F . 22 on page 49.
IG
c. Turn the pump shaft (511) with a wrench.
d. Manually push the pump shaft (511) forward to
separate the shaft from the drive block.
8. Remove the shaft lock nut (502).
9. Remove the two screws (505) that hold the pump
collar in place.
10. Remove the pump collar (509) from the pump
housing (507).
11. Slide the pump bearing housing (510) away from
the pump housing (507) to remove.
12. Remove rear pump components from the pump
bearing housing (510).
Clean and Inspect the Parts
13. Using a clean dry cloth, remove any existing grease
from the bearing housing.
14. Apply new high temperature grease lubricant
(part 115982) to the inside of the pump bearing
housing (510), and the new rebuild components.
Assemble the Rear Pump Assembly
15. Install the new rebuild kit components into the bear-
ing housing.
Be careful when installing the seal (503). Ensure
there is masking tape on the threads of the piston rod
and that the open side of the seal faces the piston rod
when it slides onto the rod.
34
. 16 on
IG
. 18 on page
IG
NOTICE
16. Apply one layer of thin masking tape over the male
threads of the pump shaft that mates with the drive
block. This will prevent the threads from damaging
the seal (503).
17. Slide the pump shaft through the hole in the bearing
housing.
18. Align the bearing housing in position next to the
pump housing.
19. Install the pump collar over the bearing housing.
20. Attach the pump housing using the two
screws (505) and torque to 350 in-lb (39.5 N•m).
21. Remove the masking tape from pump shaft (511).
22. Install the pump shaft lock nut (502) onto the pump
shaft (511).
23. Connect the pump shaft to the drive block alignment
rod (2302, 2419). See F
22 on page 49. Screw the shaft completely into the
drive block.
24. Tighten the lock nut (502).
Prepare for Operation
25. Open the tank ball valves if installed.
26. Fill tanks.
27. Perform several shots to fill the pump with new
material.
28. Calibrate and phase the machine. See the appropri-
ate operation manual referenced at the beginning of
this manual for procedure.
. 18 on page 45 and F
IG
312760Y
.
IG