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 493 of 894
TRUCK SERVICE MANUAL
FUEL SYSTEM
Fuel brown in appearance.
Dirty fuel.
Fuel Aerated.
Low oil level in tank.
Air not completely expelled from system after filter
change or after having lines disconnected for other
reasons.
Air leak between supply tank and gear pump suction.
(a) Strainer cap loose or cap gasket missing.
(b) Air leaks in strainer-to-gear pump section line or at
connections.
Check 14 - Solenoid Valve
Cause
Solenoid leaking fuel into by-pass line during test cycle.
Improperly installed solenoid valve (incoming fuel line
connected to discharge port and vial line connected to
inlet port) causing excessive restriction on metered fuel.
Solenoid valve sticks and fails to divert fuel to vials at
instant counter actuating switch is depressed.
The 0.035
inch (.89 mm) orifice below the solenoid is partially
clogged with foreign particles causing excessive
restriction which expands injector-to-solenoid line (line H,
Fig. 6-1-121) while fuel is being by-passed but regains
normal size and empties excess fuel into vial when test
New oil is clear in appearance and becomes amber
during use, never use when brown,
Based on 8 hours per day, clean filter and change oil
monthly or after 160 hours operation.
It is normal for the drain on flange-type injectors to
appear "milky."
The PT (type B) (type C) and PT (type D) drain should
normally be clear.
Fuel in the cup seat block-to-solenoid
line (line H, in Fig. 6-1-121)must always appear clear
with all injector models.
It must be possible to disconnect the injector inlet lines
immediately after shutting off the test stand without
evidence of any compressed air in the system.
Fill tank to 3/4 or above.
Without breaking fuel line connections, remove the filter
assembly from its mounting bracket.
’With the filter
assembly in inverted position and the test stand running
at low pressure, bleed the filter at the drain cock until oil
is free of air.
Correct as required.
Correction
Check for foreign particles and pitted valve or seat and
clean, repair or replace as necessary.
Check identification on solenoid valve inlet port to which
line from injector cup tip must be connected is stamped
IN.
Directly opposite is discharge port which must be
connected to vial line.
Correct if necessary.
Clean valve until it operates freely or replace.
Clean as required.
488
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