Section F. BRAKES, LINES AND FITTINGS, WHEELS AND RIMS,
This Model 200STM Hot Oil Heater is equipped with an air-over hydraulic brake system. This brake system includes a
brakeaway emergency that will set the brakes should it be disconnected from the towing vehicle. To release the
brakes when disconnected from a towing vehicle, drain air tank using the air tank drain cock.
67. Air Tank and Relay Valve
a. Removal. Refer to Figs. 53 & 54.
1. Remove all lines from air relay. Lines removed by attaching wrench and turning counterclockwise.
2. Remove four bolts with nuts and lockwashers from air tank mounting supports.
3. Remove air tank and relay valve.
4. Remove relay valve from air tank by turning counterclockwise.
b. Cleaning and Inspection.
1. Clean all parts with an approved cleaning solvent and dry thoroughly.
2. Inspect all parts for leaks, cracks, distortion, damaged threads and rust.
3. Replace all defective parts as may be necessary.
1. Connect air relay valve to air tank by turning clockwise.
2. Install air tank and relay valve on heater.
3. Replace four mounting bolts with nuts and lockwashers.
4. Reconnect lines to air relay.
68. Tires, Wheels, Rims, Springs and Shock Absorbers
The unit is supported on two 900 x 20 ply tires which are in turn mounted on two 7.5 x 20 wheel assemblies mounted
inboard of the wheels; directly under the main frame supports is one pair of 12, 000 pound springs.
NOTE: HOT OIL HEATER MUST BE ADEQUATELY SUPPORTED BEFORE ANY WORK IS STARTED ON UNDER
CARRIAGE. DO NOT USE SUPPORT JACKS FOR ONLY SUPPORT OF HOT OIL HEATER.