Cummins/Onan — Charging the High Pressure Side with Liquid R-134a
Maintenance · AC system
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 operate the power unit engine. No more than one pound of refrigerant should be added at this time.
- Adding R-134a as a liquid can damage the compressor if not done correctly.
Procedure
- Connect the center service hose from the gauge set to the R-134a container dispensing valve.
- Purge the hose of any air using R-134a gas pressure from the container.
- Turn the refrigerant container upside down.
- Open the R-134a dispensing valve and HP side hand valve on the gauge set to flow liquid R-134a into the system.
- When approximately one pound of R-134a liquid has been added, close the R-134a supply.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Approximately one pound of liquid R-134a Amazon Amazon eBay $585.30 eBay FridayParts $25.50 added through the HP side
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.