Graco Orion 234084, Instructions-Parts List Manual

Page: 21 / 38

Repair
21 309512
Displacement Pump Repair
Disassembly
1. Separate the air motor from the displacement pump.
(See page 15.)
2. Loosen and remove screws (96). See F
IG
. 11.
3. Remove the valve housing (71). This allows access
to the pressure valve. Evaluate the ball (72
✦
) and
seat (77
✦
) and replace if worn.
4. Remove the cylinder (79).
5. Remove the piston assembly.
F
IG
. 11
6. Remove piston valve (91) from the piston. Be care-
ful not to damage the surface of the piston during
repair and maintenance work. Use only the flats (Z)
to prevent the piston from rotating when removing
the screw. (See F
IG
. 12.)
7. Note the positions and orientations of the guide ring
(76**), the U-cup (92**), and the sealing ring (94)
assembled onto piston valve (91). Remove these
parts and replace with parts from the appropriate
Packing Repair Kit (page 26).
8. Suction valve parts are now accessible. Evaluate
the ball (72
✦
) and seat (77
✦
) and replace if worn.
9. Remove the sealing ring (93**) from inside the pis-
ton (95) and replace.
10. Note the positions and orientations of the packing
retainer (85), the flat seal (84**), the guide ring
(82**) and the U-cup (81**) as you remove them
from the packing housing (83). Replace the soft
parts with those included in the packing repair kit.
See F
IG
. 13.
F
IG
. 12 Piston Assembly Breakdown
Seal*, Packing**, and Valve
✦
repair kits are avail-
able. See page 26 for part numbers.
The valve seats are dual-sided and can be turned
over and reused when one side is worn. The pro-
file seal rings (75*
✦
) or (97*
✦
) and balls, should
be replaced each time the seat is turned over or
replaced.
TI2359ax
TI2360
96
71
73*
74
79
83
90*
75
✦
*
77
✦
72
✦
91
Piston
Assembly
For replacement of seal (88*), see exploded view
on page 27.
91
76**
78
95
77
✦
97*
✦
92**
93**
72
✦
94
Z