TM 5-3805-280-10
FASTENERS
SCAVENGE LINE
Visually check entire unit in regard to bolts, nuts and
screws being properly secured. Spot check several
capscrews and nuts for proper torque. If any are
WARNING
found loose, a more thorough inspection must be
High pressure air can cause severe injury or
made. Take corrective action.
death from hot oil and flying parts. Always
COMPRESSOR OIL
relieve pressure before removing caps, plugs,
Refer to Maintenance Schedule.
covers or other parts from pressurized air
system.
RECEIVER-SEPARATOR SYSTEMS
The scavenge line originates at the receiver-
separator tank cover and terminates at the
WARNING
compressor airend through an orifice (.063 inch/1.6
mm). Once a year or every 2000 hours of operation,
High pressure air can cause severe injury or
whichever comes first, remove this line and any
death from hot oil and flying parts.
Always
orifice, thoroughly clean, then reassemble.
relieve pressure before removing caps, plugs,
NOTICE
covers or other parts from pressurized air
system.
Excessive oil carry-over may be caused by an
oil-logged separator element. Do not replace
element without first performing the following
* Open service valve at end of machine.
maintenance procedure:
* Ensure pressure is relieved, with BOTH:
1.
Check oil level. Maintain as indicated earlier in
- Discharge air pressure gauge reads zero (0).
this section.
- No air discharging from service valve.
2.
Thoroughly clean scavenge line, any orifice and
check valve.
* When draining oil, remove and replace (make
tight) plug at bottom of separator tank.
3.
Assure minimum pressure
valve
(if
so
* When adding oil, remove and replace (make tight)
equipped) has proper setting.
plug on side of separator tank.
4.
Run unit at rated operating pressure for 30 to
40 minutes to permit element to clear itself.
In the compressor lubricating and cooling system,
separation of the oil from the compressed air takes
place in the receiver-separator tank.
As the
compressed air enters the tank, the change in
COOLING FAN DRIVE
velocity and direction drop out most of the oil from
The heat exchanger or cooling fan is driven by a
the air.
multiple V-belt arrangement from
the engine.
Additional separation takes place in the
oil
Inspect the cooling fan belts weekly or at 50 hour
separator element which is located in the top of the
intervals. These V-belts should be maintained at
tank.
the proper tension. Fan belts that are too tight
Any oil accumulation in this separator element is
impose an undue load on the fan shaft bearings and
shorten the life of the belts. Fan belts that are too
continuously drained off by means of a scavenge
loose allow slippage and lower the fan speed, cause
tube which returns the accumulated oil to the
excessive belt wear, and can lead to overheating of
system.
the cooling systems.
18-6
