Displacement Pump - Graco A Series Instructions-Parts List Manual

WARNING
INJECTION HAZARD
To reduce the risk of serious injury,
whenever you are instructed to relieve
pressure, follow the Pressure Relief
Procedure on page 9.
NOTE: Packing Repair Kit 235–703 is available.
Reference numbers of parts included in the kit are
marked with an asterisk, i.e., (121*). Use all the new
parts in the kit.
NOTE: Check the motor brushes (see page 20) and
clean the transducer (see page 31) whenever you
repack the pump. Replace these parts as needed.
Removing the Pump
1. Flush the pump, if possible. Relieve pressure. Stop
the pump with the piston rod (107) in its lowest
position, if possible. To lower the piston rod manu-
ally, rotate the motor fan blades.
2. Loosen the swivel nut on adapter (82) and remove
suction hose (32).
3. While pushing in on the collar of the elbow (36),
pull out and remove drain tube (33).
NOTE: If repairing only the intake valve assembly, go
to Intake valve repair, at right.
4. Use a screwdriver to push the retaining spring (18)
up and push out the pin (17).
5. Loosen the screws (21) and remove the pump
(20).

Displacement Pump

(See Fig. 19)
Intake Valve Repair
1. Unscrew the intake valve (118) with swivel (82)
attached. Remove the o-ring (119*), ball guide
(120), stop pin (122*) and ball (121*) from the
valve.
2. Clean and inspect the parts for wear or damage.
Replace parts as needed. Use a new o–ring
(119*). Reassemble the pump, or for additional
pump repair, go to page 23.
Installing the Pump
1. Mount the pump on the drive housing. Tap it into
the alignment pins with a soft hammer. Tighten the
screws (21) to 68 N.m.
A
Torque to 68 N.m
B
Apply sealant (42e)
13
18
20
21
A
33
32
Fig. 19
(See Fig. 19)
(See Fig. 19 and 20)
17
120
*122
107
36
*121
118 *119
82
B