Graco PR70 Series Operation And Maintenance Manual page 39

Pump Assembly
Key:
Ref P/N Description
1 106258 ORING, VIT, JCB
2 108712 NUT, HEX, M8 X 1.25, MS
3 120887 POSIPAK, 0.375ID X 0.625OD, COIL
4 120890 RING, RET, INT, 1.00, SS
6 120982 SCREW, SHC, M8 X 1.25 X 65, MS, E
7 15K786 HOUSING, PUMP, PR70S, MACHINED
8 15K787 CAP, END, PUMP, PR70S, MACHINED
To install a new Check Valve Rebuild Kit:
1. With the machine in an idle state and a bucket
below the dispense valve to catch material, fully
extend the piston by pressing
screen.
2. To prevent machine movement, press
3. With a bucket below the check valve to be
replaced, disconnect the male hose fitting from
the check valve housing (13), by loosing the hose
from the housing. Catch any material draining
from the hose into the bucket.
4. Remove the check valve housing (13) from the
pump endcap (8) by loosening the housing with a
wrench.
5. Remove the existing check valve (14) from the
housing (13) by inserting a screwdriver or dowel
rod into the female threaded end of the check
valve housing.
6. With the new check valve ball guide (item #3 in
figure 43) on a bench with the open end up,
install the check valve spring (item 2 of figure 47)
into the guide.
7. Install the check valve ball (item 1 of figure 47) on
top of the spring.
Figure 47: PR70 Check Valve Rebuild Kit (LC0093)
Key:
Ref P/N Description
1 105445 BALL,CHECK VALVE
2 121084 SPRING, 0.30OD X 0.44LG, 22#/IN, 20PSI, S
312393C
QTY
2
2
2
2
8
1
2
8. With the rounded inside surface of the check valve
seat (item 4 of figure 47) facing down, place the seat
on top of the check valve ball.
9. Holding both ends of the assembled check valve
in the M1
assembly, install the check valve into the un-threaded
end of the check housing (13) with the ball end facing
out. Apply some pressure to the valve to snugly fit the
(red).
completed check valve into the housing and the fit the
check valve seat (item 4 of figure 47) into the valve
guide.
10. Verify when the assembled check valve and housing
(13) are turned up-side down, that the contents of the
valve stays in place.
11. Re-insert the new valve and valve housing into the
pump end cap, using a wrench.
12. Re-install the material male hose fitting into the check
valve housing using a wrench.
13. Before re-using the machine for operation, activate a
few shots to purge any air present in the material hose
lines due to the procedure.
14. Re-calibrate the machine if necessary.
QTY Ref
1
1
Ref P/N Description
9 15K803 COLLAR, PUMP
10 15K804 HOUSING, BEARING, SEAL, PR70S
11 15K824 SHAFT, PISTON, 3/8, PR70S, SS
12 15K828 WASHER, SEAL, 3/8, PR70S, SS
13 15K895 HOUSING, CHECK VALVE
14 LC0093 KIT, REBUILD, VALVE, CHECK, PR70S
P/N Description
3 15D312 BUSHING, BALL GUIDE
4 196832 SEAT, LAPPED, CHECK VALVE
QTY
2
2
2
2
2
2
QTY
1
1
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