Figure 1-4. Servicing Unit Flow Schematic, Sheet 2.

Figure 1-4. Servicing Unit Flow Schematic, Sheet 1 of 2.

TM-5-4220-233-14 Trailer Mounted Type I Manifold Servicing Unit Trailer Mounted Type II Manifold Servicing Unit Oxygen Booster Pump Oxygen Charging Station Manual
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TM 5-4220-233-14 Figure 1-4. Servicing Unit Flow Schematic, Sheet 2. b. Trailer Assembly. The trailer assembly is used to transport the body assembly to the point of usage. Major items on the trailer include a chassis frame, axle assembly, brake system, electrical system, swivel jacks, and tool box. (1) Chassis Frame. The chassis frame is made of steel and contains the provisions for mounting the trailer components and the body assembly. The chassis also contains four tiedown/lifting provisions used to secure the complete Servicing Unit. (2) Axle Assembly. The trailer utilizes a single axle design with leaf spring suspension. The axle is a square beam design and contains provisions for the mounting of the hub bearings, brakes, and wheel assemblies. (3) Brake System. The trailer utilizes a hydraulic brake system. The system consists of a drawbar surge actuator and drum brakes on each wheel. The trailer also contains a hand actuated mechanical parking brake system that actuates the drum brakes. When the prime mover slows or stops the weight of the trailer In the forward direction applies the force necessary to actuate the surge actuator mounted on front of the trailer drawbar. The surge actuator acts as the master cylinder and provides hydraulic pressure to the brake assemblies. The surge actuator also contains the toweye provisions for connecting the trailer assembly to the prime mover. 1-13

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