TM-5-3805-254-14-P-2
TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)
TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)
JUNE 1980
TM-5-3805-254-14-P-2 - Page 846 of 894
TROUBLE SHOOTING
IMPORTANT PROCEDURE
When locating and correcting unit power or auxiliary
transmission troubles, a systematic procedure should be
followed.
Road test whenever possible. Mechanics usually get
second or third hand reports of trouble experienced with
the unit and these reports do not always accurately
describe the actual conditions. Sometimes symptoms
seem to indicate trouble in the auxiliary; while, actually
the trouble may be caused by the axle, propeller shaft,
universal joints, engine or clutch. This is especially true of
complaints on noise. Therefore, before removing
transmission or related components to locate trouble,
always road test to check possibility that trouble may
exist in other closely associated units. If the mechanic
can drive, road testing will be more effective; however,
just riding with the driver can be very informative.
Check Functioning Prior to Disassembly:
If remote controls are used, a careful check of the
remote and connecting linkage to auxiliary must be
made. The remote units and linkage must be in good
working order if the auxiliary is expected to shift
satisfactorily.
Many times the answer to the trouble is apparent
when the unit is inspected prior to disassembly, but this
evidence is often lost when the parts are separated. If
possible, check the unit prior to disassembly. Bear in
mind that a careful inspection of the unit should be made
as each disassembly step is performed.
Inspect Thoroughly During Disassembly:
It is poor practice to disassemble a unit as quickly as
possible without bothering to examine the parts as they
come down. It happens many times that a mechanic has
completely disassembled a unit and failed to find the
cause of the trouble because he did not bother to
examine the parts as they came apart. After the auxiliary
is disassembled, check the lubricant for breakdown and
foreign particles which often reveal sources of trouble
that are overlooked during the disassembly.
Repair or Replace Defective Parts:
Many times the parts or critical adjustments that
have caused the trouble are not replaced or corrected
because the mechanic will only inspect and replace parts
that have failed completely. All pieces should be
accurately examined because the broken parts are often
just the result and not the cause of the trouble. All parts
that are broken or worn and no longer meet
specifications should be replaced. On large units, like an
auxiliary, it is suggested that a mechanic replace parts
that are worn to the extent that they do not have a long
service life remaining. This avoids another teardown on
the unit in the near future. It is also good practice to
make the changes or modifications recommended to
bring the auxiliary up to date and increase the service life
of the unit.
837
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