Cummins/Onan — Temperature Sensor Battery Replacement
Maintenance
From a Cummins/Onan owner's manual covering: LP 2500, LP 3600, LP 5500, LP 6500, QD 10000, QD 12500, QD 5000, QD 5500, QD 6000, QD 8000, QG 2800, QG 4000…. Check it applies to your exact model before use.
Applies to: Cummins/Onan HDKA, Cummins/Onan HDKB, Cummins/Onan HDKC, Cummins/Onan HGJAA, Cummins/Onan HGJAB, Cummins/Onan HGJAD, Cummins/Onan HGJAE, Cummins/Onan HGJBB, Cummins/Onan HGLAA
Before you start
- Pushing on the cover too hard can damage or break it.
Procedure
- Make sure the generator set is not set to start in Auto mode.
- Remove the top cover of the temperature sensor using a small flathead screwdriver.
- Slide the battery out of the battery holder and remove the battery.
- Slide the new battery into the battery holder and replace the cover.
Tools required
- Small flathead screwdriver Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Battery is a 2450 coin battery
- Replace when below 2.5 V
- Battery life expectancy of 4 years
Full service-parts list: Cummins/Onan HDKA →, Cummins/Onan HDKB →, Cummins/Onan HDKC →, Cummins/Onan HGJAA →, Cummins/Onan HGJAB →, Cummins/Onan HGJAD →, Cummins/Onan HGJBB →, Cummins/Onan HGLAA →
Source: Cummins/Onan owner's 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.