10
307962
Air Motor Service
WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page 6.
WARNING
Never operate the pump with the air motor plates
removed. The air motor piston, located behind the
air motor plates, moves when air is supplied to the
motor. Moving parts can pinch or amputate your
fingers or other body parts.
WARNING
To reduce the risk of static arcing which could
result in a fire or explosion and serious injury, use
only non-sparking tools if the pump is being as-
sembled or worked on in a hazardous atmosphere.
NOTE:
Reference letters in parentheses in the text re-
fer to the figure illustrations.
Restarting a Stalled Air Motor
1.
Relieve the pressure
. This usually reseats the air
transfer valves. Reconnect the air and turn it on.
2.
If the air transfer valves do not reseat, screw the cap
nut (131) out of the cylinder (115), pull up on the trip
rod (101) and screw the cap nut back into the cylin-
der. See Fig 3.
Replacing the Throat Bearing
1.
Relieve pressure.
2.
Disconnect the displacement pump from the motor.
3.
Remove the warning plate (128) from the motor
base. See Fig 3.
4.
Use a 1/4 in. punch to unscrew the bearing (125).
See Fig 3.
5.
Reassemble in the reverse order of disassembly. Be
sure the air motor plates are installed before operat-
ing the motor.
Repairing the Air Motor
CAUTION
To reduce the risk of damaging parts:
Use special pliers, Part No. 207579, when handling
the trip rod. Damage to the surface of the trip rod
can result in erratic air motor operation.
Always lift the cylinder straight up off the piston.
Never tilt the cylinder as it is being removed.
WARNING
Always keep fingers clear of the toggle assemblies
(B) to avoid pinching or amputating them. See Fig.
3.
1.
Relieve the pressure
.
2.
Remove the displacement pump. See page 12.
3.
From below the motor base (102), push up the piston
rod. Unscrew the cap nut (131) just until you can pull
up the cap nut and then grasp the trip rod (101) with
the special padded pliers. Remove the cap nut. See
Fig 3.
4.
Remove the screws (105). Carefully pull the cylinder
straight up off of the piston. See Fig 3.
Fig 3
102
105
115
101
131
128
125
GRASP WITH
PADDED PLIERS
