Cummins/Onan OT UCD 280 — Overcrank Time Adjustment (Solid-State, Three-Wire Starting Only)
Adjustments · 2 to 3 wire converter module
For the Cummins/Onan OT UCD 280, from the Cummins/Onan service manual.
Browse Cummins/Onan generators & specs →
Procedure
- Remove the positive lead from the generator set's start solenoid or starter.
- Open cabinet door of automatic transfer switch.
- Move the load selector switch to WITHOUT LOAD.
- Move the operation selector switch to NORMAL.
- Move test transfer switch to TEST; overcrank lamp should light at end of crank period; measure crank time.
- To change the time, insert a small screwdriver through the CRANK TIME hole in the front of the 2 to 3 wire converter module and turn to adjust the cranking time.
- Move test transfer switch to NORMAL.
- Push the PUSH TO RESET button on the 2 to 3 wire converter module.
- Repeat until the desired cranking time is obtained.
- Move the load selector switch to desired position.
- Close and lock cabinet door.
- Reconnect positive lead to generator set's starter or start solenoid.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Overcrank settings are made at the factory for approximately 75 ± 10 seconds cranking
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.