TM 5-4310-344-34
SECTION II
MAINTENANCE AND REPAIR
2-1.
GENERAL.
2-2.
PREVENTIVE MAINTENANCE.
This section provides information useful in
a. Check air intake on first stage cylinder for
preventing trouble. This section also contains
obstruction and damage-weekly.
information on diagnosing and correcting an
unsatisfactory operation or failure of the
b. Check crankcase oil level-daily.
Add
lubricating oil, FSN 9150-753-4667 as required.
compressor.
c.
Check all lines and fittings for tightness-
weekly.
d. Drain
and
refill
each
50
operating hours.
2-3.
TROUBLESHOOTING. Each trouble symptom
stated is followed by a list of probable causes. The
possible remedy recommended is described opposite
the probable cause.
a
Insufficient Air Flow, Low Outlet Pressure, or Excessive Pump-up Time.
Probable cause
Remedy
Air leaks .......................................................................................................... Check all connecting tubes and fittings.
Tighten connections and/or replace defective parts.
Pressure relief valve damaged or defective (open) ....................................................... Check valves for escaping air.
Remove, test, and repair or replace as necessary.
Leakage from pneumatic dump valve due to ............................... Disassemble, clean, and replace parts as necessary.
Rupture discs in second or third stage cylinders leaking or blown out .................................. Install new rupture disc(s).
Restricted air inlet to compressor first stage cylinder ......................................................... Check. Remove restriction.
Clean or replace intake filter.
Compressor not operating at rated speed ............................................................Electric motor not operating properly.
See Appendix A
Damaged or worn air compressor............................................................. Remove air compressor. Repair or replace.
b
Excessive Oil Consumption
Probable cause
Remedy
Oil leaks ............................................................................. Inspect for leakage. Repair or replace parts as necessary.
Excessive piston-to-cylinder-wall clearance in air compressor ................................................Remove, test, and repair
or replace as necessary.
c
Air Compressor Overheats
Probable cause
Remedy
Oil supply low.........................................................................................................Replenish supply of oil in reservoir.
Clogged fins on cylinders or tubing....................................................................................... Check. Clean thoroughly.
d
Excessive moisture or Oil Vapor in Discharge Air
Probable Cause
Remedy
Timer does not cycle to actuate dump valve ....................................... Check relay in control box, replace if defective.
Replace defective timer.
2-1
