Thermo King MD-MT, Operator'S Manual

Page: 119 / 192

Refrigeration Service Operations
119
Whenever the two-piece pulley is removed from
any type of unit service, anti-seize lubricant
should be applied to the outside of the tapered
surface on the pulley bushing. Use one of the
following recommended anti-seize lubricants:
• Fel-Pro C5-A
• Loctite 767
• Never-Seez NS-12
• Never-Seez NS-160.
Condenser/Radiator Coil
Removal
1. Remove the refrigerant charge.
2. Remove the grille assembly.
3. Drain engine coolant and disconnect the
coolant hoses from the condenser/radiator
coil.
4. Unsolder the inlet line and liquid line
connections.
5. Unbolt and remove the condenser/radiator
coil.
Installation
1. Clean the tubes for soldering.
2. Place the condenser/radiator coil in the unit
and install the mounting hardware.
3. Solder the inlet line and liquid line
connections.
4. Pressurize refrigeration system and test for
leaks. If no leaks are found, evacuate the
system.
5. Connect the coolant hoses to radiator and refill
the cooling system tank with 50/50 ethylene
glycol/water solution.
6. Recharge the unit with refrigerant.
7. Reinstall the front grille.
Drier
Removal
1. Pump down the low side and equalize the
pressure to slightly positive.
2. Disconnect the ORS nuts at the ends of the
drier.
3. Loosen the mounting hardware and remove
the drier.
Installation
1. Place the new o-rings in the ORS fittings on
the ends of the drier.
2. Install the new drier and tighten the mounting
screws and nuts.
3. Install and tighten the inlet ORS nut. Hold the
drier with a back-up wrench on the hex behind
the ORS fitting.
4. Release a small amount of refrigerant to purge
the air through the drier. Then tighten the
outlet ORS nut.
5. Pressurize the system and inspect for leaks. If
no leaks are found open the refrigeration
valves and place the unit in operation.
High Pressure Cutout Switch
and Receiver Tank Pressure
Cutout Switch
Removal
1. Pump down the low side and equalize the
pressure in the high side to slightly positive.
2. Disconnect the wires and remove the high
pressure cutout switch from the compressor.
Installation
1. Apply a refrigerant locktite to the threads of
the high pressure cutout switch.
2. Install and tighten the high pressure cutout
switch and reconnect the wires.
3. Pressurize the refrigeration system and test for
leaks.