SECTION V: TROUBLESHOOTlNG TM 9-2350-256-20GHIJKgrilles (see paragraph 9-57) and open side air inletgrille doors. Check engine externally for evidence ofoil 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 (seeparagraph 9-60). Check engine oil cooler screens forrestrictions (see paragraph 5-6). Remove allrestrictions from oil cooler screens.Visually inspect engine oil cooler air passages. Ifengine oil cooler air passages are restricted, cleanpassages using oil cooler cleaning tool (Appendix B,item 137).Remove left- and center-front air inlet grilles (seeparagraph 9-57) and inspect oil cooler lines for kinksand/or twists. Repair or replace any damaged oilcooler 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 YSYMPTOMSBlower motor does not run.Do step A.Blower runs but does not comeup to speed.Do steps B through D.Blower unusually noisy.Do steps E and F.A Check for defective blower switch and/or circuitbreaker. Troubleshoot vehicle blower circuit (seeparagraph 2-19).Do not operate or perform maintenance onhydraulic system while doing maintenancework in the vicinity of the boom actuatingcylinder.B Check for obstructed air passage. To access intakeopening, hoist boom and remove rubber covering ofthe boom, actuating cylinder and hoisting boomconnection inside the vehicle. Remove anyobstructions. If blower still does not come up tospeed, go to step C.Change 1 2-40.9
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