Kohler MPAC 1200 / MPAC 1500 — Microswitch Replacement Procedure
Repair & overhaul
For the Kohler MPAC 1200 / MPAC 1500, from the Kohler service manual.
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Before you start
- Hazardous voltage. Disconnect all power sources before opening the enclosure.
Procedure
- Prevent all connected generator sets from starting; disconnect the starting battery, negative lead first.
- Disconnect power to the transfer switch.
- Open the transfer switch enclosure and verify zero volts across each phase.
- Note the location of the fast-on connectors to the microswitch terminals.
- Disconnect the fast-on connectors and remove the holding screws.
- Remove the suspect microswitch.
- Install the new microswitch and holding screws.
- Tighten the holding screws to 0.3 Nm (3 in. lb.).
- Connect the fast-on connections to the microswitch terminals as noted.
- Close the ATS enclosure and connect power to the ATS.
- Enable the generator set; reconnect the battery, negative lead last.
- Test the transfer switch operation per the Automatic Operation Test.
Tools required
- Basic electrician's hand tools
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Tighten holding screws to 0.3 Nm (3 in. lb.)
Source: Kohler 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.