Kohler MPAC 1200 / MPAC 1500 — Arc Chute 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 and open the enclosure.
- Verify zero volts across each phase.
- Remove the arc chute hold down screws.
- Remove the arc chute.
- Inspect the movable contact for damage.
- Install the new arc chute.
- Install the holding screws and washers; torque screws to 2.8 Nm (25 in. lb.).
- Manually operate the switch several times to ensure it does not stick.
- Close the enclosure and reconnect power to the ATS.
- Enable the generator set (reconnect 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
- Torque screws to 2.8 Nm (25 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.