Table 2-2. Unit Level Preventive Maintenance Checks And Services-continued

TM 9-2320-279-20-1

Table 2-2. Unit Level Preventive Maintenance Checks and Services

Item

Interval

Item To Be

Procedure

Not Mission

No.

Inspected

Capable If:

M1977-

CBT,

M1120

LHS Only

59.1

Semi-

Self-

Check self-guided coupler (1) for cracks, dam-

Radial wear exceeds

Annual

Guided

age, or excessive wear. Replace coupler if

3/16 in. (4.76 mm).

Coupler

cracked or damaged. If radial wear exceeds

3/16 in. (4.76 mm) total, replace coupler before

next mission. If axial clearance exceeds 1/32

in. (.79 mm), measure thickness of washer (2).

If washer (2) thickness is under 3/16 in. (4.76

Washer thickness is less

mm), replace washer. If washer thickness is

than 3/16 in. (4.76 mm).

larger than 3/16 in. (4.76 mm), adjust nut (3).

Refer to Para 14-15.01.

If circumference at worn area of coupler jaw

Circumference at worn

(4) is less than 8-1/2 in. (215.9 mm), replace

area is less than 8-1/4 in.

coupler at next scheduled service. If circum-

(209.6 mm).

ference is less than 8-1/4 in. (209.6 mm), re-

place coupler before next mission. Refer to

Para 14-15.01.

Change 5