Cummins/Onan — Setting the Exerciser
Operation · Exerciser clock
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Open the cabinet door of the automatic transfer switch.
- Move the operation selector switch (on engine control for two-wire starting, in LT cabinet for three-wire starting) to STOP.
- Install a trip pin (left-hand thread) in the inside row of holes on the large dial for the time of day you want the generator set to start.
- Place a trip pin in the outside row of holes on the large dial to stop the generator set.
- Install a trip pin in the small spoked wheel for every day no exercise is desired.
- Rotate the large dial clockwise until the correct time is correctly aligned with the time pointer.
- Align the small spoked wheel with the correct day at its pointer.
- Move the operation selector switch to RMT (on engine control for two-wire starting) or AUTO (in LT cabinet for three-wire starting).
- Close the cabinet door.
Tools required
- Trip pins (16 supplied with the clock) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Onan recommends operating the generator set for at least 30 minutes each week
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.