Table 1. Unit Preventive Maintenance Checks and Services (PMCS) for the M878A2 Yard Tractor cont'd

TM 9-2320-312-24-1

Table 1. Unit Preventive Maintenance Checks and Services (PMCS)

for the M878A2 Yard Tractor - Continued.

LOCATION

EQUIPMENT NOT

ITEM TO

ITEM

READY/AVAILABLE

CHECK/

NO.

INTERVAL

PROCEDURES

IF:

SERVICE

Semiannual

Suspension

Observe how tractor responds to road shocks.

Shifts, knocks or constant bouncing indicate

possible malfunctions.

a. Test braking response to brake pedal. a. Brakes do not operate prop-

Semiannual

Brakes

Response should be immediate. Tractor

erly.

should stop smoothly without noticeable

side pull or chatter.

b. After stopping tractor, with transmission in b. Brakes do not release

gear, release service brakes. Wheel brake

release should be immediate.

c. With tractor on downgrade and transmis-

sion in N (Neutral), set parking brake.

Tractor should not move.

WARNING

Cautiously feel each wheel hub and brakedrum. Wheel hubs and brake-

drums may be hot. Failure to follow this warning may result in serious

burns.

d. Immediately after road test, carefully

check and compare wheel hub and brake-

drum for overheating, which could indicate

a dragging brake. A cool wheel hub and

brakedrum could mean improperly

adjusted, defective or inoperative brakes.

Operate fifth wheel lift (TM 9-2320-312-10). Fifth wheel is binding. Class III

Semiannual

Fifth Wheel

Fifth wheel should raise and lower smoothly leaks are evident.

Lift

and without binding. Check for evidence of

hydraulic fluid leaks.

Semiannual

Cab Tilt

Tilt cab (TM 9-2320-312-10). Cab should tilt

System

smoothly and without binding. Ensure safety

prop is securely mounted and functions prop-

erly to support cab when tilted.

a. Check cab tilt latch at left-rear of cab for a. Damage or Class III leaks are

Semiannual

Cab Tilt

loose mounting or evidence of hydraulic

evident.

Latch and

fluid leaks. Replace any damaged compo-

Cushion

nent (WP 0121 00).

Mounts

b. Check latch bracket and vibration damper b. Loose mounting, damage or

on underside of cab for loose mounting,

wear are evident.

damage or wear. Replace any damaged

component (WP 0121 00).

c. Check right-side cab rear mount for loose c. Loose mounting, damage or

mounting, damage or wear. Replace if

wear are evident.

worn or damaged (WP 0041 00).

d. Lower cab (TM 9-2320-312-10).

0009 00-11