Graco PR70 Series Operation And Maintenance Manual page 40

Pump Assembly
Figure 48: PR70 Rear Pump Rebuild Kit (LC0094)
Key:
Ref P/N Description
1 106258 ORING, VIT, JCB
2 120890 RING, RET, INT, 1.00, SS
To install a new Rear Pump Rebuild Kit:
1. Drain the pump by taking several shots with either
the tank ball valves closed (if installed), or by
activating enough shots to empty the tanks.
2. Disconnect the pump shaft (item 11 of Figure 46)
from the drive block assembly by loosening the
shaft locking nut (item 2 of Figure 46), then turning
the shaft with a wrench while preventing the drive
block alignment rod (item 2 of Figure 45) from
rotating with a wrench. Manually push the pump
shaft forward toward the extend position to separate
the shaft from the drive block.
3. Remove the shaft lock nut from the shaft.
4. Remove the pump collar (item 9 on Figure 46) from
the pump housing (item 7 on Figure 46) by
removing the 2 screws (item 5 on Figure 46).
5. Slide the pump bearing housing (item 10 of Figure
46) away from the pump housing to remove.
6. Remove the existing rear pump build components
(refer to Figure 48 items) from the pump bearing
housing.
7. Using a clean dry cloth, remove any existing grease
from the bearing housing.
8. Apply new high temperature grease lubricant (Graco
P/N 115982) to the inside of the pump bearing
housing, and the new rebuild components.
9. Install the new rebuild kit components into the
bearing housing as indicated in Figure 48.
312393C
QTY Ref P/N
1 3 120887
1
10. Apply 1 layer of thin masking tape over the male
threads of the pump shaft which mates with the
drive block. This will prevent the threads from
damaging the seal or Posipak (3).
11. Using extreme caution, slide the pump shaft through
the hole in the bearing housing as indicated in
Figure 48. Align the bearing housing in position
next to the pump housing.
12. Re-install the pump collar over the bearing housing
and attach it to the pump housing using the 2
screws (item 5 on Figure 46) previously removed.
Torque the screws as specified in note
Figure 46.
13. Remove the masking tape from pump shaft.
14. Re-install the pump shaft lock nut to the pump shaft.
15. Re-install the pump shaft to the drive block
alignment rod.
16. Re-tighten the lock nut.
17. Open the tank ball valves (if installed) and put more
material into the tanks.
18. Instigate several shot to fill the pump with new
material.
19. Re-calibrate and re-phase the machine, due to the
procedure performed.
Description
POSIPAK, 0.375ID X 0.625OD, COIL
40 of 52
QTY
1
of