CR BRAKEMASTER 62 & 68 MODELS

Fig. 19 Purge Valve Assembly Disassembled

TM-5-3820-256-24-4 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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SERVICE MANUAL 2. Bleed air from main air reservoir. 3. Locate outlet port on air dryer assembly which is the air supply to main air reservoir. Then disconnect the air supply line or hose. 4. After hose is disconnected, the elbow and check valve assembly can then be removed separately. 5. Install new check valve assembly and seal. 6. Reinstall elbow and connect hose. 7. After air supply is restored, check connection for air leaks. CR BRAKEMASTER 62 & 68 MODELS DISCRIPTION The CR Brakemaster units (Figs. 21 & 22) are actually heat exchangers since the compressed air from the air compressor is cooled. When the compressed air leaves the air compressor, it is about 1490 C (3000 F) and by the time it reaches the Brakemaster unit, the temperature will drop to about 600 C (1400 F). Fig. 21 CR Brakemaster Model 62 The hot compressed air enters the expansion chamber where the sudden drop in pressure cools it off. The heat is carried away through the external fins which are an integral part of the one piece aluminum body. As the air cools in the expansion chamber, both water and oil vapors are condensed out. This condensation collects on the walls of the expansion chamber and runs down into the collection area where it Fig. 22 CR Brakemaster Model "8 is automatically discharged by a specially designed unloader valve. The heat exchanger has a permanent air filter element which traps carbon particles that can harm other components in the air system. Every time the unloader operates (each time the compressor completes a cycle) there is a back rush of air through the filter, so that any carbon trapped in the filter element is flushed out and ejected through the unloader valve. In an air system where the compressor is in good condition, the filter will require little or no maintenance. If the filter should require servicing, it should only need a bath in cleaning solvent. Replacement should be unnecessary. MAINTENANCE Periodic or scheduled maintenance is not required. However, for trouble free operation, the following items should be checked. 1. Steam clean cooling fins to remove accumu- lated road grime. 2. Check to be sure cooling fins have not been painted. 3. Check air lines to be sure they have not be- come kinked, cracked, broken or chafed. 4. Perform the Service Checks. CTS-4079 - CHAPTER XIV - Page 12

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