the exterior of the radiator or aftercooler core as
often as every 200 miles (320 km).
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.
Silicone hoses, having an extended service life, can
be substituted for the reinforced neoprene type.
See the
Service Parts Catalog
or contact your
dealer.
Tighten hose clamps as necessary, but do not over-
tighten as hose life can be adversely affected.
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
.
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
.
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.
11.
Check the air intake system for leaks or damage.
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.
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.
Pretrip Inspection and Daily Maintenance
9.6
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