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 511 of 894
TRUCK SERVICE MANUAL
FUEL SYSTEM
Both ends of through drain drillings are tapped so that
gear pumps can be converted from R.H. to L.H. In
normal manner.
Caution: Under no circumstances should the pump
be operated with cooling return flow plugged.
This
fuel flow is necessary to lubricate the bearing
surfaces within the gear pump.
1.
Fuel pumps with the integral cooling feature may be
identified by a 1/8 inch N.P.T.F.
hole In top of gear
pump.
2.
Install elbow-check valve, Part No.
175836, in 1/8
inch drain hole in gear pump.
A 1/8 inch N.P.T.F.
brass
street elbow and a check valve, Part No.
179037, may
be used as a substitute for valve combination.
Note:
The spring-loaded check valve is necessary to
prevent fuel in pump from draining away and causing
hard starting.
Pulsation Damper
Disassembly And Inspection
1.
Remove housing from cover.
Remove spring steel
diaphragm.
Discard "O" rings and nylon washer.
Note:
Diaphragm must be kept clean prior to assembly.
1 SEAL
5
’0’ RING
2 BODY
6
NYLON WASHER
3 ’O’ RING
7
PLATE
4 DIAPHRAGM
Fig. 5-36, F5132.
Pulsation damper - exploded view
2.
Check for corrosion, excessive wear or cracks In
cover or diaphragm.
Replace if necessary.
Fig. 5-36.
Assembly
1.
Install new "0" rings In grooves and new nylon
washer.
2.
Coat the diaphragm with a good grade of 10W or
20W oil and lay in cover.
3.
Assemble cover to housing, torque capscrews to 11 to
13 foot pounds [15 to 18 No m].
SHUT-DOWN VALVES
The shut-down valve, electric or manually operated,
controls flow of fuel from the pump to the injectors.
The
electric valve is equipped with a knob which will open the
valve.
In case of electrical power failure, keep in
counterclockwise position to operate electrically.
Electric Shut-Down Valve
The electric shut-down valve is held open while current is
flowing through the electric coil, or solenoid.
When
current is not flowing, valve will shut unless the shut-
down valve is locked open manually.
Disassembly
Remove coil housing from valve housing.
Remove coil
housing, fuel shield and discard "O" ring.
Remove spring
washer and plate-type valve.
Remove manual override
knob, and unscrew override shaft from coil end.
Discard
shaft and "O" ring.
See Fig. 5-37.
1 CONNECTION
6
’0’ RING
2 KNOB
7
VALVE
3 SEALING RING
8
SPRING
4 HOUSING
9
SHIELD
5 SHAFT
10
COIL
Fig. 5-37, F5143.
Electric shut-down valve - exploded
view
Cleaning And Inspection
1.
Clean all parts except the coil assembly in mineral
spirits.
Note:
Do not wet the coil with solvent; instead, wipe it
clean with a lint free cloth.
2.
Visually check valve and valve seat for wear, bonding
failure or corrosion.
Replace if necessary.
Valve seat
should have a minimum seat 0.015 inch [0.38 mm] wide.
Fig. 5-38.
3.
Check coil assembly with an Ohm meter, replace if
below values given in Table 5-6.
Caution: Be sure starting switch is in off position
when checking coil.
506
Back to Top
