TM-9-2330-267-14-P

TRAILER, TANK, WATER: 400 GALLON, 1-1/2 TON, 2 WHEEL M149, M149A1 AND M149A2

TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS)

JULY 1991

TM-9-2330-267-14-P - Page 122 of 354

TM 9-2330-267-14&P

4-39. AIRBRAKE CHAMBER REPLACEMENT.

This Task Covers:

a.

Test

c.

Installation

b. Removal

Initial Setup:

Materials/Parts:

Tools/Test Equipment:

l Three Iockwashers

l General mechanic’s tool kit

Personnel Required: Two

1.

2.

3.

4.

With service brake released, insert small rod (2)

through one of two inspection holes (3) in airbrake

chamber (1).

Mark rod (2) at surface of support when rod

contacts pushrod return spring in airbrake cham-

ber (1).

Apply service brake and mark rod (2) again at

surface of support when rod contacts pushrod

return spring in airbrake chamber (1).

Withdraw rod (2), and measure distance between

two marks. Distance between two marks indi-

cates distance of pushrod travel.

5.

Adjust service brakes to permit a minimum of ½ in. (12.7 mm) and a maximum of ¾ in. (19.1 mm) pushrod travel

(para 4-32).

6.

Disconnect intervehicular air hoses from towing vehicle and see if brakes apply automatically.

b.

REMOVAL

1.

Remove tube (5) and elbow (4) from airbrake chamber (1).

CAUTION

Master cylinder must be supported when airbrake chamber is removed. Damage to

hydraulic brake line may result if master cylinder is not supported.

2.

Remove three nuts (9), Iockwashers (8), and airbrake chamber (1) from master cylinder (7) and mounting

bracket (10). Discard Iockwashers.

3.

Remove identification plate (6) if damaged.

TA507038

4-72