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TROUBLESHOOTING THE BULLDOG AIR MOTOR
To restart a stalled motor, close the bleed type master
air valve to bleed off all trapped air pressure. This will
go to the top or bottom of its stroke.
trip the air valve of the air motor causing the piston to
WARNING
To locate where air is leaking, shut off the air supply and
Locating Air Leaks
disconnect the hose. Screw the inlet union
( 5 6 )
out of
the union back into manifold. See Fig 1. Connect the air
the air manifold cap
(28).
remove the shield, then screw
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 just 10-15 psi
(0.7-1 bar). Then use the checking methods l.isted in the
Check Chart, below, to find where air is leaking.
The filter element (58) in the air inlet filter assembly (56)
should be cleaned e t least every 6 months to help en-
sure unrestricted air flow to the motor.
CHECK CHART
Stroke Position
Ref. Points
Check Method
UP stroke only F By listening
for air leak at exhaust outlets
Worn trip rod packing (32). or
wring (17)
Worn throat packing (33)
Blown air cylinder gasket
(44)
Letter
Cause of Leakage
B
By feel
C,D,E or K
Squirt oil around wiper (16)
DOWN stroke only D,F,G,H or K
By feel
Damaged air manifold gasket ( 5 3
sound
lap faces with #500 grit sanpaper
BOTH
E
By feeling exhaust or hearing a high pitched Worn air valves
(22).
Replace or
F By feeling
or hearing a high pitched sound Worn O-ring packing (17)
D or
G
H
Squirt oil around O-ring (9)
Damaged housing O-ring (9)
By feel
Blown manifold gaskets (48 & 5 3 )
307304
8'
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