Cummins/Onan — Overcrank Time (AT-E Only)
Adjustments · 2 to 3 wire converter module 9
From a Cummins/Onan service manual — check it applies to your exact model before use.
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 selector switch to WITHOUT LOAD.
- Move 2 to 3 wire converter module 9 selector switch to NORMAL.
- Move test transfer switch to TEST. Overcrank lamp on automatic transfer switch should light at end of crank period. Measure the crank time with a stop watch or watch with a second hand.
- To change the time, insert a small screwdriver through the CRANK TIME hole in the front of the 2 to 3 wire converter module. Turn clockwise to increase the cranking time or counterclockwise to decreas
- Move test transfer switch to NORMAL.
- Push the PUSH TO RESET button on the 2 to 3 wire converter module.
- Repeat Steps 5 through 8 until the desired cranking time is obtained.
- Move selector switch to desired position, WITHOUT LOAD or WITH LOAD.
- Close 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.