TRAILER - TM-5-4930-233-140018

TM 5-4930-233-14

TM 4930-14/1

g. Also provided is an air service chuck (15). This chuck can be used to operate some of the auxiliary equipment

such as the transfer pump (16). This pump is for direct dispensing of lubricant from bulk storage containers,

such as 55 gallon drums.

h. The reel cabinet assembly (5) also provides storage for certain tools and equipment.

WINTERIZATION ASSEMBLY

i. The vehicle is also equipped with a winterization assembly to aid in starting and operating in extreme cold

weather. The winterization heater (17) is operated using the control box (18). The heater provides warm air that

travels to various parts such as the engine and air compressor through a system of hoses and ducts (19). The

heater receives its fuel from the same tank (20) that provides fuel to the air compressor engine, although the

heater has a separate fuel pump.

TRAILER

a. The trailer (21) provides a mobile platform for the skid sub assembly. The trailer includes such safety features

as a fire extinguisher (22), reflectors (23), and an air over hydraulic brake system.

AIR BRAKES

b. The trailer brake system is connected to the towing vehicle by the emergency and service brake couplers (24).

The air is then directed to the emergency relay valve (25). This valve sends the air received from the

emergency brake coupler to the air tank (26). This is used to apply the emergency brakes should there be a

sudden pressure drop sensed in the emergency brake line (such as during a trailer break away). The air stored in

the air tank can also be used to apply the parking brake when the air supply valve (27) is activated. The air

received through the service brake line is sent to the power cluster (28). The power X cluster converts the air

pressure into hydraulic pressure by use of an air cylinder and a master brake cylinder. The hydraulic fluid is sent

to the service brakes through tubing to apply the brakes up on operator demand.

ELECTRICAL

c. The trailer is also equipped with 12 Vdc clearance, turn signal and tail lights that are activated along with those of

the towing vehicle. The electrical power for these lights can be received in either 12 or 24 volts and is converted

to the correct voltage in the junction box (29).

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