Refrigeration Service Operations
120
4. If no leaks are found, open the refrigeration
valves and place the unit in operation.
High Pressure Relief Valve
Removal
1. Remove the refrigerant charge.
2. Remove the high pressure relief valve.
Installation
1. Apply a refrigerant oil to the O-ring on the
high pressure relief valve.
2. Install and tighten the high pressure relief
valve.
3. Pressurize the refrigeration system and test for
leaks. If no leaks are found, evacuate the
system.
4. Recharge the unit with refrigerant.
Suction Pressure Regulator
Valve
Removal
1. Pump down the low side and equalize the
pressure to slightly positive.
2. Remove the remaining pressure and unsolder
the suction pressure regulator valve from the
accumulator tank and suction tube.
Installation
1. Clean the tubes for soldering.
2. Place the valve in position and solder the
connections.
3. Pressurize the low side and check for leaks.
4. If no leaks are found, evacuate the low side.
5. Open the refrigeration valves, and place the
unit in operation. Check the refrigerant charge
and add refrigerant as required.
Accumulator
Removal
1. Pump down the low side and equalize the
pressure to slightly positive.
2. Drain the engine cooling system.
3. Disconnect the water hoses.
4. Remove the mounting bolts from the
accumulator tank mounting brackets.
5. Unsolder the refrigerant lines from the tank.
6. Lift the accumulator tank from the unit.
Installation
1. Place the accumulator in the unit.
2. Install the mounting bolts loosely.
3. Solder the refrigerant tubes to the accumulator
tank.
4. Tighten the accumulator tank mounting bolts.
5. Pressurize the low side and test for refrigerant
leaks.
6. If no leaks are found, evacuate the low side.
7. Connect the water hoses and refill the engine
cooling system (see Engine Maintenance).
8. Open the refrigeration valves and place the
unit in operation. Check the refrigerant charge
and the compressor oil and add as required.
CAUTION: Do not stand under the
accumulator tank when removing the
suction line. The tank or the suction line
may leak oil.
Summary of Contents for MD-MT
Page 4: ...4...
Page 10: ...Table of Contents 10...
Page 22: ...Specifications 22...
Page 43: ...Unit Description 43 Figure 15 Engine Side Door Open ARD041...
Page 48: ...Unit Description 48...
Page 128: ...Refrigeration Service Operations 128...
Page 134: ...Hilliard Clutch Maintenance 134...
Page 136: ...Structural Maintenance 136...
Page 148: ...Refrigeration Diagnosis 148...
Page 150: ...Remote Evaporator Specifications 150...
Page 152: ...Remote Evaporator Maintenance Inspection Schedule 152...
Page 156: ...Remote Evaporator Unit Description 156...
Page 160: ...Remote Evaporator Structural Maintenance 160...
Page 162: ...Remote Evaporator System Diagnosis 162...
Page 166: ...Wiring and Schematic Diagrams Index 166...
Page 167: ...167 MD RD MT Model 30 w In Cab Schematic Diagram Page 1 of 2...
Page 168: ...168 MD RD MT Model 30 w In Cab Schematic Diagram Page 2 of 2...
Page 169: ...169 MD RD MT Model 30 w In Cab Wiring Diagram Page 1 of 3...
Page 170: ...170 MD RD MT Model 30 w In Cab Wiring Diagram Page 2 of 3...
Page 171: ...171 MD RD MT Model 30 w In Cab Wiring Diagram Page 3 of 3...
Page 172: ...172 MD RD MT Model 30 w In Cab CYCLE SENTRY Schematic Diagram Page 1 of 2...
Page 173: ...173 MD RD MT Model 30 w In Cab CYCLE SENTRY Schematic Diagram Page 2 of 2...
Page 174: ...174 MD RD MT Model 30 w In Cab CYCLE SENTRY Wiring Diagram Page 1 of 3...
Page 175: ...175 MD RD MT Model 30 w In Cab CYCLE SENTRY Wiring Diagram Page 2 of 3...
Page 176: ...176 MD RD MT Model 30 w In Cab CYCLE SENTRY Wiring Diagram Page 3 of 3...
Page 177: ...177 MD RD MT Model 30 CYCLE SENTRY Wiring Diagram Page 1 of 3...
Page 178: ...178 MD RD MT Model 30 CYCLE SENTRY Wiring Diagram Page 2 of 3...
Page 179: ...179 MD RD MT Model 30 CYCLE SENTRY Wiring Diagram Page 3 of 3...
Page 180: ...180 MD RD MT Model 50 w In Cab Schematic Diagram Page 1 of 2...
Page 181: ...181 MD RD MT Model 50 w In Cab Schematic Diagram Page 2 of 2...
Page 182: ...182 MD RD MT Model 50 w In Cab Wiring Diagram Page 1 of 3...
Page 183: ...183 MD RD MT Model 50 w In Cab Wiring Diagram Page 2 of 3...
Page 184: ...184 MD RD MT Model 50 w In Cab Wiring Diagram Page 3 of 3...
Page 185: ...185 MD RD MT Model 50 w In Cab CYCLE SENTRY Schematic Diagram Page 1 of 2...
Page 186: ...186 MD RD MT Model 50 w In Cab CYCLE SENTRY Schematic Diagram Page 2 of 2...
Page 187: ...187 MD RD MT Model 50 w In Cab CYCLE SENTRY Wiring Diagram Page 1 of 3...
Page 188: ...188 MD RD MT Model 50 w In Cab CYCLE SENTRY Wiring Diagram Page 2 of 3...
Page 189: ...189 MD RD MT Model 50 w In Cab CYCLE SENTRY Wiring Diagram Page 3 of 3...
Page 190: ...190 MD RD MT Model 50 CYCLE SENTRY Wiring Diagram Page 1 of 3...
Page 191: ...191 MD RD MT Model 50 CYCLE SENTRY Wiring Diagram Page 2 of 3...
Page 192: ...192 MD RD MT Model 50 CYCLE SENTRY Wiring Diagram Page 3 of 3...