Kohler — Overspeed Shutdown Check (Pot. 5) - Models Without NFPA Controllers
Adjustments · Voltage Regulator Board
From a Kohler service manual covering: 10/15RMOY, 15/17.5ROY, 15RMY, 22.5-47.5ROZ, 22.5/32.5RZ. Check it applies to your exact model before use.
Applies to: Kohler 15RMY
Procedure
- While observing the frequency counter, slowly increase engine speed (adjusting the engine governor) just to the point where the set shuts down. Note the frequency reading just prior to shutdown.
- Reading shall be within: 50 Hz Sets 60 + 2 Hz; 60 Hz Sets 70 + 2 Hz.
- Readjust the governor slightly to reduce engine speed, preventing an immediate shutdown upon restart.
- Turn the controller main switch to OFF position and reset the overspeed fault.
- After restarting the set, readjust the engine speed governor for the set's specified output frequency.
- If the set fails to pass this test, perform Overspeed Shutdown Adjustment (Pot. 5).
Tools required
- Frequency counter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 50 Hz Sets 60 + 2 Hz
- 60 Hz Sets 70 + 2 Hz
- 50 Hz Sets 61 + 1 Hz (adjustment)
- 60 Hz Sets 71 + 1 Hz (adjustment)
Full service-parts list: Kohler 15RMY →
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.