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 540 of 894

TRUCK SERVICE MANUAL

FUEL SYSTEM

3.

Neglect of Maintenance

a.

Use of hose lengths, diameters and residencies other

than those which are specified.

b.

Fuel routing which is not to specifications.

c.

Filter assemblies which have a different dampening

effect on the system.

d.

Critical components of the test stand such as check

valve, gauge and hydraulic injector clamping poorly

maintained.

e.

Failure to make checks with master ST768 gauge

snubbers.

Complaint and Corrections

Charted on the following pages are the complaints, showing

the items to check for correction of the complaints if the Fuel

Pump Test Stand has been properly maintained leaving no

Test Stand error.

Each check is numbered, so you may go

immediately to the tabulated description of the causes and

corrective action as necessary.

Cause

Check 1

: Openings not sealed correctly.

Check 2

: Suction connection is not tight or is damaged.

Check 3

: Idle Plunger dirty.

Idle Plunger worn.

Check 4:

Governor Plunger dirty.

Governor Plunger worn.

Check 5:

Blocked fuel passages.

Check 6

: Faulty governor assembly.

Check 7:

Pump turning wrong direction.

Check 8

: F low valve not open.

Correction

Seal all openings and use new gaskets where necessary.

Tighten suction connection or replace if mutilated.

Check face of Idle Plunger (pressure control button) for

any foreign material.

Change Idle Plunger to give a square fit with governor

plunger (use same Idle Plunger code number).

Clean Idle Plunger mating face of foreign material.

Change Governor Plunger to give a square fit with Idle

Plunger.

Clean fuel passages so they are all open.

Check governor assembly for proper assembly.

Check pump for right or left hand rotation and set test

stand accordingly.

Open test stand flow valve to allow fuel to enter gear pump.

535