Graco 218334, Instructions Manual

Page: 9 / 20

Maintenance and Repair
307714E 9
Fluid Leaks
If the pump continues to operate when the hydraulic out-
let valve is closed, the packings are worn or the ball
check valves are leaking.
If anything more than a light film of fluid is detected at
the weep hole, the base bearings gasket (100) or both
the gasket and the base bearing (98) need to be
replaced.
Air Motor Service
Stalled Air Motor
A stalled air motor may be caused by icing due to
unusual environmental conditions such as:
• operating at a high cycle rate under hot, high humid-
ity conditions
• long operation under cold, arctic conditions
If a motor stalling is not caused by environment condi-
tions, try filling the air lubricator with non-detergent, SAE
#10 oil to prevent stalling.
To start a stalled motor, either turn off the air and allow
the ice to melt (if stalling is due to icing) or follow this
procedure:
1. Turn off the air supply.
2. Remove the lift ring (74).
3. Push down the air valve housing (102) with a screw
driver. DO NOT use your fingers!
4. Screw the lift ring (74) back on.
5. Turn on the air supply.
Air Motor Disassembly
Reference numbers used in the following instructions
refer to F
IG
. 4 on page 10.
1. Turn off air supply
2. Relieve pressure, page 7.
3. Disconnect all hoses, tubes, controls, etc. from the
air motor to provide ease in servicing.
4. Remove lift ring (74).
5. Remove the swivel adapter (117). Remove the eight
cap screws (75). Then lift the air motor shield (73)
off the air motor.
6. Remove the air inlet spring cap (107) and the detent
spring retainers (77).
7. Take out the compression springs (78), spring
guides (79), and the plungers (80) . Inspect the
parts for wear or damage and replace them as nec-
essary.
8. Remove the four screws (82) and lock washers (83)
holding the detent housing (81). Lift the housing up,
off the air manifolds (87) while holding the detent
rollers (89) in the housing.
9. Remove the detent rollers (89), axles (90), thrust
washer (96) and dampening pad (97) from the
detent housing (81). Inspect the parts for ware and
damage. If either the roller or axle is worn or dam-
aged, replace both; that are a matched set.
10. Remove the caps crews (85) and lockwashers (86).
11. The air director valves (92) are spring compressed
between the air valve housing (102) and the mani-
fold valve plates (101).
CAREFULLY remove both
air manifolds. Check the air director valves (92),
o-rings (93) and springs (94) for wear or damage.
Replace if necessary.
12. Remove the four screws (88) in each manifold plate
(101). Check the manifold plates and seals (42) for
Do not use your fingers to disengage the air valve
housing. Moving parts in the air motor can pinch or
amputate your fingers.
NOTICE
Handle springs carefully. Scratches or nicks will
cause early spring failure.