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Original Issue Date: 5/96
Model: 4/5CKM/CKMR, 4CFKM/CFKMR, 7CCKM/CCKMR, 7CCFKM/CCFKMR,
Market: RV, Mobile, and Small Standby
Subject: Kohler Electronic Governor (D-278670) Troubleshooting
Kohler Generator Division, in an attempt to reduce returns
of functional electronic governors, created this bulletin to
better inform customers. Consult the Service Manual for
adjustment procedures not found in this bulletin.
Model
4/5CKM/CKMR
4CFKM/CFKMR
7CCKM/CCKMR
7CCFKM/CCFKMR
6.5RMY
Figure 1. Service Manual Selection
OVER
SPEED
GAIN
M3
M4
M2
70
M1
P7
AD
MP
MP
N
Figure 2. Kohler Electronic Governor Control
Service
Routing
Manager
Initial
Here
SERVICE BULLETIN
and 6.5RMY
Service Manual
Publication Number
TP-5394
TP-5570
TP-5632
SPEED
P2
Sales
Parts
Technician
Manager
Manager
No. 1
Accidental starting.
Can cause severe injury or death.
Disconnect battery cables before working on
generator set (disconnect negative lead first and
reconnect it last).
Disabling generator set.
cause severe injury or death.
cables (remove negative lead first and reconnect it last) to
disable generator set before working on the generator set
or connected equipment.
started by the remote start/stop switch unless this
precaution is followed.
Technician
Technician
Return
No. 2
No. 3
This to
SB-555 5/96
WARNING
Accidental starting can
Disconnect battery
The generator set can be
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Summary of Contents for Kohler 4CKM
- Page 1 6.5RMY Market: RV, Mobile, and Small Standby Subject: Kohler Electronic Governor (D-278670) Troubleshooting Kohler Generator Division, in an attempt to reduce returns WARNING of functional electronic governors, created this bulletin to better inform customers. Consult the Service Manual for adjustment procedures not found in this bulletin.
- Page 2 The governor system consists of an electronic WARNING isochronous governor, an electro-mechanical stepper motor, and a magnetic pickup. Electrical pulses are supplied by the magnetic pickup to the isochronous governor (control unit) each time one of the ring gear teeth passes the pickup.
- Page 3 Magnetic Pickup (See Figure 3 or Figure 4) The magnetic pickup provides an AC signal to the control unit. Minimum voltage output from the pickup during engine cranking should be 1.75 VAC. Air Gap (See Figure 3 or Figure 4) The air gap between the ring gear and pickup should be 0.040 inches.
- Page 4 Actuator TOP VIEW (See Figure 5 and Figure 6) The actuator consists of a stepper motor coupled to the carburetor throttle shaft. It receives signals from the governor control unit and rotates the shaft to the proper position. To test for proper operation of the actuator, disconnect magnetic pickup leads.
-
Page 5: Governor Control
Governor Control Gain Adjustment The electronic control board provides power to the The Gain Potentiometer (Pot) pertains to governor actuator. It also controls energizing and de-energizing of sensitivity. See Figure 8. the fuel— anti-diesel (AD) solenoid or gas valve. Prior to any governor adjustments: 1. - Page 6 Overspeed Adjustment 3. While observing the frequency meter, manually turn the governor actuator shaft until frequency reaches The governor control contains a circuit which will the desired cut-out speed. de-energize the carburetor fuel solenoid (AD) if the NOTE generator exceeds the overspeed setting. Do not exceed 72 Hertz 4.
- Page 7 Condition (Fault) Result Throttle moves to closed position and fuel shut-off solenoid de-energizes Loss of pickup while running (genset shutdown) Engine overspeed Fuel shut-off solenoid de-energizes (genset shutdown) Break of fuel shut-off solenoid lead Fuel shut-off solenoid de-energizes Loss of DC power to governor assembly Fuel shut-off solenoid de-energizes (genset shutdown) Break of stepper motor leads Erratic performance then fuel shut-off solenoid de-energizes (genset shutdown)