Repair - Graco A Series Repair And Parts Manual

Displacement Pump Repair
Removal
WARNING
To reduce risk of injury due to sprayer starting
unexpectedly, shut off engine before performing
checks or service.
1. Fig. 3. Flush sprayer. Remove suction hose elbow
(150a), pump outlet hose (A) and drain hose (64).
WARNING
MOVING PARTS HAZARD
To reduce risk of amputating fingers,
keep fingers away from connecting rod
and pin while jogging engine.
2. Fig. 4. Start engine. Jog flow control between
PRIME and OFF until connecting rod stops near
bottom of stroke. Shut off engine.
3. Loosen two quick disconnect screws (27).
4. Pry retaining spring (37) up on connecting
rod (128). Push pin (38) out with a screwdriver.
5. Fig. 3. Disconnect cables (B) from pressure trans-
ducer (63) and air cylinder (22).
6. Support weight of pump (3) and remove two quick
disconnect screws (27).
7. Unscrew assembled dump valve manifold (85) and
air cylinder (22) from pump (3).

Repair

See page 8 for pump repair instructions.
Installation
1. Fig. 3. Screw assembled dump valve manifold (85)
and air cylinder (22) into pump (3).
2. Fig. 4. Pull piston rod (201) out of pump (3) 2 to 3
inches (50 to 75 mm).
WARNING
MOVING PARTS HAZARD
If pin works loose, parts could break off
due to force of pumping action. Parts
could project through the air and result in
serious injury or property damage. Make sure pin
and retaining spring are properly installed.
3. Lift pump (3) into position and push in pin (38). Be
sure retaining spring (37) snaps down over end of
pin.
4. Install two quick disconnect screws (27). Torque
screws to 20 ft-lb (27 N.m).
5. Fig. 3. Connect cables cables (B) to pressure
transducer (63) and air cylinder (22).
A
27
150a
Fig. 3
3
1
Torque to 20 ft–lb (27 N.m)
2 Back of pump
Cutaway view shows how pin (38) goes
3
through connecting rod
Fig. 4
22
B
85
3
64
38
38
23
201
37
128
128
1
27
61
3
309662
B
63
TI3021A
2
0407
7