Service; Before Starting; Air Motor And Throat Disassembly - Graco A Series Instructions-Parts List Manual

Service

Service

Before Starting

Have all necessary parts on hand. Always replace the
glands and bearing when replacing the packings. Use
all the parts in the repair kits for the best results.
Air Motor and Throat
Disassembly
1. Flush the pump and relieve the pressure. See Pres-
sure Relief Procedure on page 8.
2. Disconnect the hoses, remove the pump from its
mounting, and clamp the air motor base in a vise.
3. Use a strap wrench on the riser tube (12) to screw it
out of the air motor base (55).
4. Pull the connecting rod (10) down as far as it will go.
5. Use a hammer and punch to remove the roll pin (4).
Unscrew the connecting rod (10). (F
NOTICE
Do not damage the plated surface of the trip rod (54).
Damaging the surface of the trip rod can result in
erratic air motor operation. Use the special padded
pliers, Part No. 207579, to grasp the rod.
6. Manually push up on the piston rod (41) to move the
piston assembly (59) up as far as it will go. Unscrew
the cap nut (47). Pull the nut up. Grip the trip rod
(54) with padded pliers and screw the nut off the
rod. (F . 15)
IG
NOTICE
To avoid damaging the cylinder wall, life the cylinder
straight up off the piston. Never tilt the cylinder as it is
being removed.
7. Remove the six screws (25). Pull the cylinder
straight up off the piston. (F
16
. 15)
IG
. 15)
IG
51
25
59
55
43
49
41
10
48
F . 15
IG
8. Use a screw driver to push down on the trip rod
yoke (28) and snap the toggles down. (F
47
27
54
38
39
42
44
50
V–PACKINGS:
SEE DETAIL
BELOW
4
LIPS OF V–PACKINGS
MUST FACE DOWN
72
. 16)
IG
308069P