TM-9-2520-238-34

M113A1 FOV, M113A2 FOV, M548 AND M548A1

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL; RIGHT ANGLE DRIVE, COOLING FAN; GEARCASE, TRANSFER; DRIVE ASSEMBLY, FINAL; DIFFERENTIAL, STEERING CONTROL; BRAKE, SINGLE DISK; CYLINDER ASSEMBLY, HYDRAULIC BRAKE

TM-9-2520-238-34 - Page 177 of 319

TM 9-2520-238-34

REPAIR FINAL DRIVE ASSEMBLIES A AND B — Continued

0020 00

RUN-IN TEST

NOTE

Conduct run-in test in accordance with local operating procedures.

2.

Mount ﬁnal drive in same position as in the carrier (line connecting input and output shaft center lines at 15 to 25 degrees

from vertical).

3.

Install ﬁller tube, liquid level gage rod, vent tube and elbow, and adapter as installed in carrier (see your -20).

4.

Fill housing with oil between ADD and FULL marks on liquid level gage rod (about 3-1/2 quarts or 7 pints).

5.

Operate ﬁnal drive according to the following schedule, checking for undue noise level, local heating, leaks, and

vibration at each phase:

Table 1. RUN-IN TEST SCHEDULE

Stage (rpm)

Direction

Stage Time (minutes)

900 to 1100

Forward

6 to 8

900 to 1100

Reverse

6 to 8

1900 to 2100

Forward

3 to 5

1900 to 2100

Reverse

3 to 5

2900 to 3100

Forward

1 to 3

2900 to 3100

Reverse

1 to 3

6.

Drain oil into a suitable container. Leave residual oil for use as a preservative during shipping and storage.

7.

Remove ﬁller tube and vent components installed in Step 2 above (see your -20).

8.

Cover ﬁller tube vent and input shaft openings.

0020 00-13

Take care to prevent damage to machined surfaces, gears, bearings, and other components

during maintenance activities.

N

O

WARNING

I

T

U

A

Lifting or moving objects in excess of 70 pounds could injure you. Make sure to get an assistant

or use a lifting device to move heavy objects.

C

1.

Install sling and suitable lifting device to final drive

9.

Remove sling and suitable lifting device from final drive