Graco Complete Manual for Water Dispensers: PR70 Assembly and Maintenance Guide

Pump Assembly

Key:

Ref	P/N	Description	QTY	Ref	P/N	Description	QTY
1	106258	ORING, VIT, JCB	2	9	15K803	COLLAR, PUMP	2
2	108712	NUT, HEX, M8 X 1.25, MS	2	10	15K804	HOUSING, BEARING, SEAL, PR70S	2
3	120887	POSIPAK, 0.375ID X 0.625OD, COIL	2	11	15K824	SHAFT, PISTON, 3/8, PR70S, SS	2
4	120890	RING, RET, INT, 1.00, SS	2	12	15K828	WASHER, SEAL, 3/8, PR70S, SS	2
6	120982	SCREW, SHC, M8 X 1.25 X 65, MS, E	8	13	15K895	HOUSING, CHECK VALVE	2
7	15K786	HOUSING, PUMP, PR70S, MACHINED	1	14	LC0093	KIT, REBUILD, VALVE, CHECK, PR70S	2
8	15K787	CAP, END, PUMP, PR70S, MACHINED	2

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 in the M1 screen.

2.To prevent machine movement, press (red).

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.

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 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 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.

Figure 47: PR70 Check Valve Rebuild Kit (LC0093)

Key:

Ref	P/N	Description	QTY	Ref	P/N	Description	QTY
1	105445	BALL,CHECK VALVE	1	3	15D312	BUSHING, BALL GUIDE	1
2	121084	SPRING, 0.30OD X 0.44LG, 22#/IN, 20PSI, S	1	4	196832	SEAT, LAPPED, CHECK VALVE	1

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