Graco 256200 Water Pump User Manual


 
Repair
16 312766N
3. Use a pliers on the top plate of the air valve
piston (38) and a wrench on the piston rod
(35) to unscrew the air valve piston from
the piston rod. See F
IG
. 11.
4. Remove washer (10), lower spring (9), and
gasket (27). Inspect for wear or damage
and replace as necessary. See F
IG
. 13.
5. If any valve plate spacers (38d) are dam-
aged, replace all three to maintain the cor-
rect clearance between the valve plates
(18a,18f) and the seats. See F
IG
. 12.
6. Disconnect the piston rod (35) from the
pump connecting rod (37) and pull the pis-
ton rod out of the air motor base (13).
Remove o-ring (6). Inspect o-ring (6) and
replace if necessary.
Air Motor Reassembly
1. Reinstall o-ring (6). Reconnect the piston
rod (35) and the pump connecting rod (37).
See F
IG
. 13.
2. Reinstall the gasket (11), spring (9), and
washer (10). Reassemble the piston (38).
Apply thread sealant to the threads of the
piston rod (35) and carefully screw the pis-
ton (38) onto the rod. See F
IG
. 11 and F
IG
.
13.
F
IG
. 11
F
IG
. 12
ti11654a
38
35
02125
38d
38a
38f
Apply locking compound to threads.
Torque to 10-14 in-lb (1.1-1.6 N•m)
1
2
1
2
1
F
IG
. 13
When installed, there should be 0.032
in. (0.8 mm) minimum clearance
between the washer (10) and the
shoulder of the piston rod (35).
TI17177a
10
35
9
27
6
13
37