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 543 of 894

TRUCK SERVICE MANUAL

FUEL SYSTEM

Cause

Check 1

: Low fuel manifold pressure.

Check 2

: Fuel manifold pressure too high or too low

because of incorrect Idle Plunger (Button) or surface finish.

Check 3

: Gear Pump fails to obtain delivery and pressure.

Check 4:

Wrong throttle restriction.

Check 5:

Test Stand set at wrong flow rate.

Check 6:

Throttle screw out of adjustment.

Check 7:

Governor Weight Carrier assembly incorrect or

faulty.

Check 8:

Scored governor plunger.

Correction

Replace fractured pulsation damper diaphragm.

Replace Idle Plunger (Button) with correct plunger if

incorrect plunger was used.

Polish surface of plunger if

rough, burrs or chipped areas are found on surface of

plunger.

Replace gear pump.

Set throttle restriction to correct values.

Set test stand at flow rate indicated in calibration data

pertinent to fuel pump being calibrated.

Adjust throttle screw.

Replace with correct new governor weight carrier assembly.

Replace with new governor plunger and lap to fit.

Cause

Check 1

: Idle plunger or governor plunger rough or

voids.

Check 2

: 800 RPM Checkpoint.

Check 3:

Incorrect torque or governor spring.

Correction

Polish surface with oil stone or replace if necessary.

Check 800 RPM checkpoint under Complaint No.

7 to be sure

It is within specifications before proceeding.

Remove front cover and check for proper torque or

governor spring and free length of spring.

Shim

torque

spring.

538