SUBSECTION 9A
AIR SYSTEM
13. COMPRESSOR KNOCKS CONTINUOUSLY OR IN-
TOUBLESHOOTING (Cont'd)
TERMITTENTLY
11. AIR PRESSURE DROPS QUICKLY WITH ENGINE
Loose drive pulley
Back lash in drive gears or drive coupling
STOPPED AND BRAKES RELEASED
Worn or burnt out bearings
Leaking brake valve
Excessive carbon deposits in compressor cylinder heed
Leaking tubing or hose line
Compressor discharge valve leaking
14. SAFETY VALVE "BLOWS OFF"
Compressor governor leaking
Safety valve out of adjustment
Excessive leakage elsewhere in the Air Brake System
Air pressure in the Air Brake System above normal
12. AIR PRESSURE DROPS QUICKLY WITH ENGINE
15. EXCESSIVE OIL OR WATER IN THE BRAKE
STOPPED AND BRAKES FULLY APPLIED
SYSTEM
Leaking brake chamber,
Reservoirs not being drained often enough
Cutout cock improperly left open
Compressor passing excessive oil
Leaking brake valve
Compressor air strainer dirty
Leaking tubing or hose line
9A-4
