Graco PR70 Series Operation And Maintenance Manual page 43

Pistons
Figure 50: Available PR70 Piston and Cylinder (Metering Tubes) Kits
Key:
Ref Description
1 Cylinder or Metering Tube
2 Piston
3 Front Washer
Figure 51 PR70 Piston Plug Assemby
Key:
Ref P/N Description
1 15K815 Plug
2 111457 Oring
To install a new Piston Plug Assembly:
1. Drain the machine pistons by instigating several
shots with either the tank ball valves closed (if
installed), or by activating enough shots to empty
the tanks.
312393C
QTY Ref
1 4
1 5
See Fig. 6
QTY
2/Machine
2/Machine
Description
Back Washer See Fig.
Screw
Oring
2. To prevent machine movement, press
3. Remove the existing Piston plug (1) from the pump
end cap (item 8 of figure 46) with a wrench.
Remove the existing Oring (2).
4. Lubricate the new Oring with a high temperature
grease, Graco P/N 115982 or equivalent. Place the
lubricated Oring into the cap location of the end cap.
5. Re-install the piston plug (1) back into the end cap.
6. Open the tank ball valves (if installed) or put more
material into the tanks.
7. Instigate several shot to fill the pump with new
material.
8. Re-calibrate the machine, due to the procedure
performed.
QTY
1
2
43 of 52
(red).