Drawbar Assembly

hydraulic system is provided to raise or lower the dolly,

and is completely independent of the hydraulic system on

the other dolly. A lockout feature is also provided to

prevent front wheel cramping during the positioning oper-

ation. The weight of the towbar depresses a pin in the

steering arm, which engages in a socket on the axle. This

lockout device is only actuated when the front dolly is in

the retracted position and the towbar is perpendicular

to the front axle.

Drawbar Assembly

1.3.2

The drawbar assembly is designed for use with a prime mover

and, when deflected sideways, operates the steering linkage

to move the wheels to a maximum angle of 40 degrees either

side of neutral.

Rear Trailer Dolly

1.3.3

The rear dolly consists of a axle assembly, wheels, brake

assemblies, an adapter and a high pressure hydraulic system.

It is similar to the front dolly described in paragraph

1.3.1 except it is not steerable, and includes two stop and

tail lamp assemblies and a blackout stop lamp assembly. A

harness assembly interconnects these lamp assemblies with the

prime mover.

Brake System. (Part No. 7400017-502)

1.3.4

Hydraulically operated service brakes are provided on all

four wheels. These brakes are pneumatically operated from the

towing vehicle. The brakes are equipped to automatically ad-

just themselves when the vehicle is backed-up. In addition,

a mechanically actuated parking brake is incorporated in the

wheels of the rear dolly.

High-Pressure Hydraulic System

1.3.5

The high-pressure hydraulic systems are the means for raising

or lowering the mobilizer. Each consists of a hydraulic pump,

control valve, check valve, and necessary tubing unions, and

connectors . The hydraulic pump is a 6000 PSIG, hand-operated

pump, with an integral hydraulic reservoir. Pressure in the

system is released by the control valve and may be utilized

to control the rate of flow of the return fluid.

Lighting System (Part No. 7400017-502)

1.3.6

The lighting system operates on 24 volt direct current which

is supplied to the lamp assemblies mounted on the rear trailer

dolly. These lamps operate in conjunction with the corre-

sponding lamps on the prime mover. A twelve (12) pin

military type connector mounted on the rear trailer dolly provides

the connection point for the intervehicular cable provided.

The intervehicular cable has mating connectors for the one

located on the Prime Mover and on the rear trailer dolly.