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 492 of 894
TRUCK SERVICE MANUAL
FUEL SYSTEM
(a) Leakage past the piston sealing rings.
(This is
accompanied with loss of fluid from the reservoir
and appearance of oil out the cylinder vent when
the piston is actuated to top travel.)
(b) Hydraulic lock-up valve leaking.
(This may be
checked by placing valve in closed position and
applying air pressure.
Indicated travel of piston
rod verifies leaking hydraulic lock-up valve.)
Check 10 - Load Test Cell
Cause
Gauge on load cell has become miscalibrated as a result
of mis-handling such as dropping or excessive loading.
Check 11 - Plunger Actuating Link
Cause
Use of wrong injector model link causing hydraulic piston
return spring to be worked at a height other than that
when checking the load cell.
Plunger actuating link
binding on link guide bracket.
Plunger actuating link distorted or cracked on socket and
causing cocking during operation of stand.
Check 12 - Test Oil Leaks
Cause
Cup seat O-ring leaking.
(Leak may appear as mist.)
Cup seat block-to-solenoid line (line H in Fig.
6-.1-121)
leaking in between tank and front panel.
(To check this,
route line H temporarily in front of panel and operate test
stand.)
Visual leaks.
Check 13 - Test Oil Condition
Cause
Improper fuel or dilution.
Replace sealing rings as required.
(See Fig.
6-1-122 for
assembly instructions.)
Repair or replace as required.
Correction
Check the load cell on a valve spring tester at 380 lbs
[172 kg] load.
The load cell should read 380 lbs [172 kg]
.
Correct the gauge with the recalibration screw on the
gauge face.
Correction
Use correct link for injector being calibrated.
Align link guide bracket so that it does not contact link at
any point.
Inspect link visually and during running of
stand and
replace if necessary.
Correction
Replace O-ring with new one.
If an O-ring of a larger
crosscut diameter is used, the injector may bounce on
the cup seat and thus affect transfer groove and
metering orifice timing.
Any bouncing of the injector on
the cup seat must be corrected.
Correct as necessary, remove rear panel.
Correction
Keep tank 3/4 full of Cummins 99011-68 test oil or Shell
Injector Oil No.
66631.
Use of oil not meeting these
specifications or diluted until viscosity or specific gravity
values are affected will cause improper calibration.
487
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