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 491 of 894

TRUCK SERVICE MANUAL

FUEL SYSTEM

Check 8 - Air Pressure Regulator

Cause

Excessive moisture.

Regulated pressure "creeps."

Check 9 - Hydraulic Clamping

Cause

Leaks-(hydraulic clamping system).

This may be verified by the following check:

(1) Clamp the load-cell in the stand.

(2) If after 3 minutes the load-cell reading should

change position by more than 20 lbs [9.07 kg].

(3) Dry all plumbing connections and watch for

seepage with

air valve closed and with it open.

(4) If no external seepage is indicated and the

condition still

persists, one of the following exists.

If 1/32 inch clearance has been affected because of loose set screw or

any other condition, the following steps should be taken to obtain

proper clearance.

1.

Loosen set screw so that shaft slides freely in housing.

2.

Manually engage clutch by fully depressing solenoid (inside

main housing).

With clutch held in this position, the cross pin in the

clutch shaft should be positioned to clear the end of the "U" slot in

clutch driver by approximately 1/32 inch.

3.

Tighten set screw against flat on clutch shaft.

4.

Check operation, if solenoid is noisy (loud hum or chatter)

recheck Step No. 2.

Fig. 6-1-122, F601060.

Position of collar and drive clutch

Correction

Drain regulator bowl each day by releasing spring loaded

valve.

Clean filter by removing bowl, wash in solvent and air

dry.

Remove the top housing, valve seat and valve assembly.

Inspect the disc and seating surface of valve seat.

Inspect the valve guide and valve guide recess for

foreign particles.

Clean all parts thoroughly.

While the top housing is removed for the preceding step,

check the diaphragm and slip ring and replace faulty

parts.

Correction

(See below for specific corrections.)

Check for leaks at bleed plug and correct as required.

Correct as required.

Fig. 6-1-123, F60159.

Hydraulic loading cylinder

486