Graco Pneumatic PR70, Instructions Manual

Page: 27 / 34

Repair
313937A 27
Check Valve Rebuild Kit
Installation
Prepare Machine for Kit Installation
1. Relieve pressure. See Pressure Relief Procedure
on page 16.
2. To prevent machine movement, set the Pump Mode
switch to RETRACT.
3. Place a waste container below the dispense valve to
catch any dispensed material.
4. Push the drive block forward until pistons are fully
extended.
5. Move the waste container to below the check
valve (514).
6. Disconnect the male hose fitting from the check
valve housing (513) by loosening the hose from the
housing. See Rear Pump Rebuild Kit Installation
on page 24.
7. Remove the check valve housing (513) from the
pump endcap (508) by loosening the housing with a
wrench.
8. Remove the existing check valve (514) from the
housing by inserting a screwdriver or dowel rod into
the female threaded end of the check valve
housing (513).
9. Place the new check valve ball guide (2103) on a
bench with the open end up. Install the check valve
spring (2102) into the guide.
10. Install the check valve ball (2101) on top of the
spring (2101).
11. Place the seat (2104) on top of the check valve
ball (2101) with the outside chamfered side of the
seat facing away from the check valve ball.
12. Hold both ends of the assembled check valve
assembly and install the check valve into the
unthreaded end of the check valve housing (513)
with the ball end facing out.
13. Apply pressure to the valve to snugly fit the assem-
bled check valve (514) into the check valve
housing (513). Fit the check valve seat (2104) into
the valve guide.
14. Use a wrench to insert the new valve and valve
housing into the pump end cap (508).
15. Install the material male hose fitting into the check
valve housing using a wrench.
16. Before operating the machine, activate a few shots
to purge any air present in the material hose lines.
17. Calibrate the machine if necessary.
See HydraCheck Kit Installation on page 20 and
Rear Pump Rebuild Kit Installation on page 24
for part references not shown in the following figure.
F
IG
. 8: Check Valve Rebuild Kit
1
Side of seat with outside chamfer must face away
from ball. Side of seat with inner radius must face the
ball.
1
2104
2101
2102
2103
ti12565a
Outside
Chamfer
Inner Radius
Verify when the assembled check valve (514) and
housing (513) are turned up-side down that the
contents of the check valve stay in place.