TM 5-3805-293-23-1
0011
GENERAL
This work package contains troubleshooting information for the 120M Motor Grader. Each malfunction or symptom
listed is followed by the possible cause(s) and suggested remedy or remedies. This work package should be used
as an aid in the isolation and correction of system problems.
Ensure all PMCS and operator troubleshooting (TM 5-3805-293-10) have been performed before continuing.
Table 1. Engine Troubleshooting Procedures for the 120M Motor Grader.
0011
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. Alternator Noise
1. Inspect the condition of the
Drive Belt Worn - Replace drive belt
alternator drive belt, pulley,
(WP 0093).
vibration damper, belt tensioner,
refrigerant compressor pulley, and
crankshaft pulley (WP 0032).
Alternator Pulley Damaged -
Replace pulley (WP 0094).
Refrigerant Compressor Pulley
Damaged - Replace compressor
assembly (WP 0096).
Crankshaft Pulley Damaged -
Replace crankshaft pulley (WP 0083).
Vibration Damper Damaged -
Replace vibration damper (WP 0083).
Belt Tensioner Binds or Sticks -
Replace belt tensioner (WP 0093).
2. Inspect that the alternator
Mounting Bracket Bolts Loose -
mounting bracket bolts are tight
Tighten mounting bracket bolts (WP
and secure (WP 0094).
0094).
3. Inspect alternator mounting
Alternator Mounting Bracket
bracket for cracks and wear (WP
Damaged - Replace alternator
0094).
mounting bracket (WP 0094).
4. Inspect alternator drive pulley and
Drive Pulley Nut Loose - Tighten
nut (WP 0094).
drive pulley nut (WP 0094).
Drive Pulley Damaged - Replace
drive pulley (WP 0094).
5. Check alternator drive shaft and
Alternator Drive Shaft Damaged -
bearings for wear (WP 0094).
Replace alternator (WP 0094).
Alternator Bearings Worn - Replace
alternator (WP 0094).
0011-2
