BREAKS-AIR
TRUCK SERVICE MANUAL
3,000 Miles:
35,000 Miles:
Service compressor air strainer. Remove and
Remove compressor discharge valve cap nuts and
wash all parts including curled hair in 'leaning solvent.
check for presence of excessive carbon deposits. Also,
Saturate curled hair with clean engine oil and squeeze
check the discharge line for carbon. If excessive carbon
dry before replacing it in the strainer.
is found in either check, the cylinder head or discharge
line should be cleaned or replaced.
Check compressor mounting and drive
for
If compressor is self lubricated type, service
alignment, belt tension, etc. Adjust if necessary.
crankcase breather.
Clean and wash breather in
cleaning solvent.
10, 000 Miles:
If the compressor is lubricated from the engine, clean oil
supply line to compressor. Also clean oil return line to
If compressor is self lubricated type, the oil should
engine crankcase if chassis is so equipped.
be drained and the compressor crankcase flushed and
refilled with clean engine oil.
100,000 Miles:
Depending upon operating conditions and
experience, disassemble compressor, clean and inspect
all parts thoroughly. Repair or replace all worn or
damaged
parts.
TROUBLE SHOOTING
Compressor Passes Excessive Oil
Compressor Fails to Maintain Adequate pressure in the
Air Brake System
1. Excessive wear.
1. Dirty intake strainer.
2. Dirty air strainer.
2. Excessive carbon in compressor cylinder head
3. Excessive oil pressure.
or discharge line.
4. Oil return line or passage to engine compressor
3. Discharge valves leaking.
crankcase flooded.
4. Excessive wear.
5. Oil seal ring in end cover excessively worn.
5. Drive belt slipping.
6. Back pressure from engine crankcase.
6. Inlet valves stuck open.
7. Piston rings improperly installed.
7. Excessive leakage of inlet valves.
Compressor Does Not Unload
Noisy Operation
1. Loose drive pulley.
1. Defective unloading piston grommet.
2. Excessive carbon in cylinder head or damaged
2. Unloading cavity plugged with carbon.
line.
3. Unloading mechanism binding or stuck.
3. Worn or burnout bearings.
4. Excessive wear.
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