Piston/Cylinder Replacement Kit Installation - Graco PR70 Repair And Parts Manual

Piston/Cylinder Replacement Kit
Installation
See Piston Package on page 58 and Nylon and
UHMW Piston Replacement Kits on page 61 for
kit numbers.
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 14.
3. Models with ADM: To prevent machine movement,
press the Machine Disable Mode key (
Models with SDM: To prevent machine movement,
press the Red button
Disassemble Cylinder
4. Remove the four end cap screws (506). See F
on page 33.
5. Remove the pump end caps (508). See F
page 33. Allow the cap to hang by the hose.
6. Remove the cylinder (601) and o-rings (606) from
the pump housing (507). See F
312760Y
606
601
1
606
ti12438a
).
.
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. 9 on
IG
. 9 on page 33.
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7. Push the drive block (104, AA) forward until pistons
are fully extended. See F
page 29.
8. Use a wrench to prevent the pump shaft (511) from
rotating and remove the piston screw (605). See
F . 9 on page 33.
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9. Remove the piston (602) and any front or rear
washers (603) from the pump shaft (511). See F
9 on page 33.
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 . 9 on page 33.
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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.
. 9
21. Calibrate and phase the machine. See the operation
manual referenced at the beginning of this manual
for procedure.
. 7 and F . 8 on
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. 9 on page 33.
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. 9 on page 33.
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Repair
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