TM-9-2320-285-24-1

TRUCK TRACTOR, YARD TYPE, 43,500 LB GVW, DED, 4X2, ARMY MODEL M878A1

TECHNICAL MANUAL; ORGANIZATIONAL, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL

OCTOBER 1985

TM-9-2320-285-24-1 - Page 930 of 987

TM 9-2320-285-24-1

2-81.

SPEEDOMETER TROUBLESHOOTING

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1.

POINTER MOVES ERRATICALLY OR SCRAPING NOISE IS HEARD

Step 1.

Remove speedometer cable and check if speedometer cable is kinked

(para 2-85).

a.

If speedometer cable is kinked,

replace (para 2-85).

b.

If speedometer cable is not kinked,

go to step 2 below.

Step 2.

Check speedometer cable for inadequate lubrication.

a.

If speedometer cable is inadequately lubricated,

lubricate (para

2-85).

b.

If speedometer cable is adequately lubricated,

go to step 3

below.

Step 3.

Inspect speedometer cable housing for dents,

sharp bends,

or other

damage.

a.

If speedometer cable housing is damaged,

replace speedometer

cable and housing (para 2-85).

b.

If speedometer cable housing is not damaged,

go to step 4 below.

Step 4.

Replace speedometer head (para 2-85).

a.

If malfunction is corrected,

speedometer head was defective; no

further action is required.

b.

If malfunction is not corrected,

go to step 5 below.

Step 5.

Replace speedometer adapter and gear assembly (para 2-85).

a.

If malfunction is corrected,

speedometer adapter or gear

assembly was defective; no further action is required.

b.

If malfunction is not corrected,

transmission requires repair;

notify direct support maintenance.

2-907