Pretrip Inspection and Daily Maintenance the exterior of the radiator or aftercooler core as often as every 200 miles (320 km). NOTE: On Cummins engines, a belt tensioner au- tomatically adjusts the fan and alternator belt to the correct tension. If the belt slips, repair or re- place the tensioner. For instructions, see the Cum- mins Shop Manual ISB Engines. 7. Check the condition of the coolant hoses and heater hoses. Make sure the radiator inlet and outlet coolant hoses and heater hoses are pliable and are not cracking or ballooning. Replace hoses that show signs of cracking, weakening, or ballooning. Re- place all hoses, including heater hoses, at the same time.
Service-type knitted or braided yarn- reinforced neoprene hose is acceptable. 9. Inspect the engine for fuel, oil, and coolant leaks. Correct any leaks found. 10. Inspect the engine and chassis wiring. Inspect the engine and chassis for loose wiring, chafed insulation, and damaged or loose hold-down clamps. Tighten loose wires or hold-down clamps. Replace damaged wiring or clamps. Silicone hoses, having an extended service life, can be substituted for the reinforced neoprene type. See the Service Parts Catalog or contact your dealer. 11. Check the air intake system for leaks or damage. Tighten hose clamps as necessary, but do not over- tighten as hose life can be adversely affected.
Check the intake-air restriction indicator to deter- mine if the air cleaner filter element needs to be changed. Replace the filter element if the yellow signal stays locked at 25 inH 2 O for Cummins en- gines. See Group 09 of the Cargo Workshop Manual for filter element replacement instructions. Be sure the hose support brackets are securely fas- tened. Make sure the hoses are not located near sources of wear, abrasion, or high heat. 8. Check the condition of the drive belts. Check the drive belt for signs of glazing, wear (frayed edges), damage (breaks or cracks), or oil contamination.
If a belt is glazed, worn, damaged, or oil soaked, replace the belt following the instruc- tions in Group 01 of the Cargo Workshop Manual. Check the engine air intake piping from the air cleaner to the engine intake. Inspect the piping for loose connections, cracks, torn or collapsed hoses, punctures, and other damage. Tighten loose con- nections and replace damaged components. Make sure the piping system is airtight so that all of the intake air passes through the air cleaner. 9.6