SECTION V: TROUBLESHOOTlNG
grilles (see paragraph 9-57) and open side air inlet
grille doors. Check engine externally for evidence of
oil leaks. Tighten all loose fittings and connections.
Check engine cooling grille openings for restrictions.
Remove all material that blocks air flow to engine.
Remove left and right deck air inlet doors (see
paragraph 9-60). Check engine oil cooler screens for
restrictions (see paragraph 5-6). Remove all
restrictions from oil cooler screens.
Visually inspect engine oil cooler air passages. If
engine oil cooler air passages are restricted, clean
passages using oil cooler cleaning tool (Appendix B,
Remove left- and center-front air inlet grilles (see
paragraph 9-57) and inspect oil cooler lines for kinks
and/or twists. Repair or replace any damaged oil
cooler lines (see paragraph 5-7).
With engine operating at approximately 200°F
(93°C), cautiously feel oil cooler lines and oil cooler.
If oil cooler lines are hot and oil cooler is only warm,
notify Direct Support Maintenance.
V E N T I L A T I O N B L O W E R A S S E M B L Y
Blower motor does not run.
Do step A.
Blower runs but does not come
up to speed.
Do steps B through D.
Blower unusually noisy.
Do steps E and F.
A Check for defective blower switch and/or circuit
breaker. Troubleshoot vehicle blower circuit (see
Do not operate or perform maintenance on
hydraulic system while doing maintenance
work in the vicinity of the boom actuating
Check for obstructed air passage. To access intake
opening, hoist boom and remove rubber covering of
the boom, actuating cylinder and hoisting boom
connection inside the vehicle. Remove any
obstructions. If blower still does not come up to
speed, go to step C.