Graco Python A25011, Instructions - Parts Manual

Page: 28 / 58

Repair
28 3A4386E
Remove Air Piston and Fluid Plunger
Assembly
1. Follow the Pressure Relief Procedure, page 17.
2. Expose the packing nut (16) by rotating the dust
shield (12) as you pull downward.
3. Loosen, but do not remove, the packing nut (16).
4. Remove the air piston cylinder (8) from the air motor
housing (1) by loosening the three set screws (10)
so they are almost completely removed.
NOTE: The upper air motor is under light spring tension;
therefore, it is necessary to hold downward pressure on
the air piston cylinder (8) as the set screws (10) are
loosened.
5. Carefully slide the air piston cylinder (8) away from
the air motor housing (1), taking great care to keep
the fluid plunger (5) from contacting any metal sur-
faces. The fluid plunger (5) may come out with the
air cylinder (8) during removal and can stay con-
nected to the air piston (6) during repair.
6. Remove the pump piston (6) and plunger (5)
assembly from the air cylinder (8).
7. Inspect the air piston seal, fluid plunger surfaces,
and return spring (4), and replace as necessary.
See Replace Air Motor Seal on page 29.
F
IG
. 12 Expose and loosen packing nut
16
12
1
2
3
F
IG
. 13 Remove air piston cylinder and components
8
10
6
5
4
1