Cummins/Onan — Adding Compressor Oil
Maintenance · AC compressor
From a Cummins/Onan service manual covering: ES2075s, FS1870s, M11979s, M1976s, M1977s, M1978s. Check it applies to your exact model before use.
Applies to: Kubota 2482B engine
Before you start
- Do not open the oil fill on the compressor when the system is charged; refrigerant and oil are released under pressure.
Procedure
- Measure the length of the larger #10 refrigerant hose from the power unit to the evaporator.
- Refer to Table 13-1 to determine the amount of oil to add to the system.
- Remove the top cover from the power unit and locate the AC compressor.
- Carefully remove the oil fill cap and use a clean syringe to add the required amount of oil.
- Securely reinstall the oil fill cap.
Tools required
- clean syringe Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Table 13-1: additional compressor oil requirements for cabover installations (by #10 hose length in feet)
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.