Piston/Cylinder Replacement Kit Installation - Graco PR70 Repair Parts

Repair
Piston/Cylinder Replacement Kit
Installation
605
603
602
604
1
The arrow imprinted on the cylinder points
toward the pump outlet.
Prepare Machine for Kit Installation
1. Drain the pump.
• If ball valves are installed, close the ball
valves then take several shots.
• If ball valves are not installed, empty the
tanks. Perform shots repeatedly until no mate-
rial comes out of the dispense valve.
2. Relieve pressure. See Pressure Relief Procedure,
page 13.
3. To prevent machine movement, press the Machine
Disable Mode key (
Disassemble Cylinder
4. Remove the four end cap screws (506). See F
on page 28.
5. Remove the pump end caps (508). See F
page 28. Allow the cap to hang by the hose.
6. Remove the cylinder (601) and o-rings (606) from
the pump housing (507). See F
7. Push the drive block (104, AA) forward until pistons
are fully extended. See F
page 24.
8. Use a wrench to prevent the pump shaft (511) from
rotating and remove the piston screw (605). See
F . 7 on page 28.
IG
30
606
601
1
606
ti12438a
).
IG
. 7 on
IG
. 7 on page 28.
IG
. 5 and F . 6 on
IG IG
9. Remove the piston (602) and any front or rear
washers (603) from the pump shaft (511). See F
7 on page 28.
10. Clean the washers.
Install Cylinder
11. Install the new piston and any front or rear washers.
12. Install the piston screw (605).
Tighten the piston screw until the piston stops rotat-
ing, then turn the screw an additional 1/4 turn.
13. Fully retract the piston.
14. Lubricate the new o-rings with high temperature
grease (part 115982).
15. Insert the lubricated o-rings (606) into the grooves
of the pump housing (507) and end caps (508). See
F . 7 on page 28.
IG
16. Install the cylinder between the pump housing (507)
and end cap (508). See F
17. Secure cylinder in place with the four end cap
screws (506). See F
Prepare Machine for Operation
18. Open the tank ball valves if installed.
19. Fill tanks.
20. Perform several shots to fill the pump housing (507)
with new material.
21. Calibrate and phase the machine. See the operation
. 7
manual referenced at the beginning of this manual
for procedure.
. 7 on page 28.
IG
. 7 on page 28.
IG
312760A
.
IG