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 542 of 894
TRUCK SERVICE MANUAL
FUEL SYSTEM
Cause
Check 1
: Governor Spring incorrect due either to wear or
incorrect Governor Spring.
Check 2
: Loosen or broken weights.
Broken weld, weight pins
or carrier.
Governor weights incorrect for that specific pump.
Check 3:
Governor plunger improper fit in governor Barrel.
Sheared governor plunger drive tangs.
Check 4
: Governor Barrel not located in housing correctly,
preventing fuel passages from lining up.
Governor barrel not pinned into position.
Check 5:
Spring pack lock ring out of position.
Check 6
: Gasket leakage between fuel pump housing and
gear pump.
Correction
Replace spring if worn beyond limits listed in Table 5- 1-2.
Replace with new parts as necessary.
Governor weights, of the correct weight, should be installed
(heavy or shaved).
Refit the governor plunger to the Barrel.
This usually
requires a plunger one or two classes larger than previously
used and must be lapped to fit with No.
80 fine grit lapping
compound.
Remove ail lapping compound after use.
Replace drive tangs on plunger assembly.
Line up the fuel passages as not to restrict fuel flow.
This may
be done by heating housing in oven at 300 deg. F (149 deg. C)
and removing Barrel and then reinstalling in housing.
Make sure fuel passages are lined up and install pin into
governor barrel.
Lock ring must be in groove to correctly adjust governor.
Gasket should be replaced or relocated.
Correct gasket must
be used.
Cause
Check 1:
Throttle shaft scored or incorrect fit in throttle
sleeve.
Check 2:
Governor plunger incorrect fit in governor barrel.
Check 3:
Leakage past MVS plunger if MVS is used.
Correction
Install next size larger throttle shaft, if neccessary.
Fit to bore
must be free without sticking tendency when rotating or
moving in or out of bore by hand.
If oversize shaft does not
correct leakage, send housing to rebuild center.
Install next
size larger plunger.
Fit to bore must be free with
out sticking tendency when rotating or moving in or out of the
bore by hand.
Install next size larger plunger or remove shims between snap
ring and governor housing.
537
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