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To restart a stalled motor, close the bleed-type master
air valve to bleed off all trapped air pressure. Turn the
air back on. This will trip the air valve of the air motor,
causing the piston to go to the top or bottom of its
stroke.
WARNING
The piston in the air motor moves when air is
supplied to the motor. Moving parts can pinch or
amputate your fingers or other body parts. To
reduce the risk of serious bodily injury, be sure to
follow the Pressure Relief Procedure Warning on
page 8 before servicing the motor.
Stroke Position
UP stroke only.
DOWN stroke only.
BOTH strokes.
Troubleshooting
CHECK CHART
Letter Ref. Points
F
B
C
G
G
E
F
D or G
H
K
Locating Air Leaks
To locate where air is leaking, shut off the air supply
and disconnect the hose. Screw the air inlet assembly
(56) out of the air manifold cap (28), remove the shield
(54), then screw the inlet assembly back into the man-
ifold. See Fig. 3. Connect the air hose and turn the air
on. Stall the pump on both the up and down stroke as
indicated in the Check Chart below, and adjust the air
regulator to 0.7–1.0 bar (10–15 psi). Use the methods
listed in the Check Chart to find where air is leaking.
On Model 215–255 only, the filter element (58) in the
air inlet assembly (56) should be cleaned at least every
6 months to help ensure unrestricted air flow to the
motor.
Check Method
By listening for air leak at
exhaust outlets.
By feel.
Squirt oil around wiper
(16).
By feel.
By feel.
By feeling exhaust, or
hearing a high-pitched
sound.
By feel, or hearing a high-
pitched sound.
By feel.
Squirt oil around o-ring (9). Damaged housing o-ring
By feel.
Cause of Leakage
Worn trip rod packing (32).
Blown air cylinder gasket
(44).
Worn throat packing (33).
Damaged cylinder gasket
(48).
Damaged air manifold
gasket (53).
Worn director valve (22).
Replace, or lap faces with
no. 500 grit sandpaper.
Worn piston o-ring (17).
Blown manifold gaskets
(48 and 53).
(9).
Damaged o-ring (18).
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