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Troubleshooting the Air Motor
Preventive Maintenance Schedule
The operating conditions of your particular system
determine how often maintenance is required. Estab-
lish a preventive maintenance schedule by recording
when and what kind of maintenance is needed, and
then determine a regular schedule for checking your
system.
Air Motor Cylinder
Premier motors require lubrication and continuous
maintenance including the replacement of the air motor
cylinder casting at least every 15,000,000 cycles of
use. Use Premier cylinder repair kit 16P239.
Repair or replace the Air Valve assembly (222799)
whenever motor stalling or hesitation occurs. This
ensures the motor does not overtravel and cause
added stress to the cylinder casting.
WARNING
EXPLOSION HAZARD
Without proper maintenance, the cylin-
der casting (120026) may fracture
unexpectedly due to metal fatigue. This
is a potentially hazardous condition and
may result in serious injury. The precise
life of this casting is difficult to predict
and is affected by the operating pressure, number
of cycles, lubrication and air valve maintenance.
Checking the Air Motor for Leaks
or Damaged Parts
If the pump is not performing well, the problem could
be in the air motor. To check the air motor, perform the
following steps.
1. Close the bleed-type master air valve. Disconnect
the air line.
2. Remove the shroud. Refer to page 11.
3. Reinstall the air inlet fitting (22). Reconnect the air
line.
4. Open the bleed-type master air valve and set the
air regulator to about 0.1 MPa, 1 bar (14 psi).
Observe the rocker arms and trip rods for smooth
operation. Check at points A through E in Fig. 2 by
listening or feeling for escaping air, or squirting a
small amount of oil around the suspected leak.
The oil will bubble if air is leaking. Refer to the
sections noted in the Check Chart for detailed
service procedures.
Check Chart
NOTE: Service the air valve every 3 million cycles. If
the air motor stalls, service the air valve immediately.
Ref.
Letter
Problem Refer to:
A Rocker assemblies
(29) not operating.
Service rocker arms
(see pages 17 and
18).
B Air escaping around
trip rod or push rods.
Service trip rod
and air valve
(see pages 11–16).
Service push rod
seals (see pages 17
and 18).
C Air escaping around
air valve (25).
Service air valve
and air valve gaskets
(see pages 11–16).
D Air escaping around
or out of exhaust
manifold (45).
Service slide blocks
and air valve seals
(see pages 11–16).
E Air escaping around
piston rod (4).
Service piston and
rod seals (see pages
19 and 20).
F Air motor stalls. Service air valve (see
the NOTE above, and
refer to pages 11–16).
Install the detent, trip
rod, and air valve kits
(see pages 21–24).