Thermo King – Compressor Oil Checks

Purpose: To check compressor oil level, oil condition and oil pressure.
Oil Level Check Procedure
1. Warm the unit evaporator by operating the unit with 60 to 70 F (16 to 21 C) air over the evaporator for 10 to 15 minutes or operate the unit in heat or defrost for 10 to 15 minutes.
2. If the unit has been operated in heat or defrost, operate it in cool for 5 minutes.
3. Compressor sight glass should be 1/4 to 3/4 full.

Removing Excess Oil or Oil Sample Procedure
1. To remove compressor oil, install an access valve actuator (204 – 625) on the compressor oil pump or oil filter fitting and operate the unit. Catch oil in appropriate container.

Adding Oil Procedure
1. To add compressor oil, perform a compressor pumpdown.
2. Adjust crankcase pressure slightly positive and remove the oil fill plug above the oil pump. Add oil as needed. Evacuate compressor to remove air.

NOTE: Units do not consume oil. Check and add oil as required if there has been a refrigerant leak or major component replacement.

One Reply to “Thermo King – Compressor Oil Checks”

  1. I’m new with reefer unit truck. I’m looking for a usual oil dip stick check for level. Is it just the sighted oil floating in the filter for a good level?

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