Graco PR70 Repair Parts page 29

6. Remove the shroud (117, 214). See F
page 34 and F . 15 on page 41.
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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
37 and F . 16 on page 42.
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c. Turn the pump shaft (511) with a wrench.
d. Manually push the pump shaft (511) forward to
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.
CAUTION
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.
16. Apply one layer of thin masking tape over the male
threads of the pump shaft that mates with the drive
312760A
. 10 on
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17. Slide the pump shaft through the hole in the bearing
18. Align the bearing housing in position next to the
19. Install the pump collar over the bearing housing.
20. Attach the pump housing using the two
. 12 on page
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21. Remove the masking tape from pump shaft (511).
22. Install the pump shaft lock nut (502) onto the pump
23. Connect the pump shaft to the drive block alignment
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
28. Calibrate and phase the machine. See the appropri-
block. This will prevent the threads from damaging
the seal (503).
housing.
pump housing.
screws (505) and torque to 350 in-lb (39.5 N•m).
shaft (511).
rod (2302, 2419). See F
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16 on page 42. Screw the shaft completely into the
drive block.
material.
ate operation manual referenced at the beginning of
this manual for procedure.
Repair
. 12 on page 37 and F
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29
.