TP-6805 8/1568 Section 5 Troubleshooting
5.10 Troubleshooting Engine
Hunting, 20 kW Models
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
Moving parts.
WARNING
Adapted from SB-722.
Engine hunting can be the result of a number of factors.
Experience has shown that replacement of the
controller or stepper motor is typically not effective in
solving hunting-related issues.
The following steps outline a troubleshooting sequence
to help diagnose and pinpoint the cause of the frequency
fluctuation and suggestions for resolving the condition.
Perform the steps in the order shown and test the
operation after each step. If one step does not solve the
hunting, proceed to the next step.
1. To prevent automatic starting, disconnect the ATS
by disconnecting PWR and COM (RXT) or engine
start leads 3 and 4 ( RDT).
2. Confirm the operating conditions that produce
generator hunting: no load, loaded, and/or only
during exercise.
3. Most hunting cases can be solved by completing
the following two steps:
a. Update to the most current version of firmware
available. The Kohler Generator Service
Department will provide the most current
version if it is not yet available on TechTools.
b. Models 20RESA(L) and 20RESC(L): Install
vent tubes on the two reference ports on the
fuel regulator. Procure the parts shown in
Figure 5-8 locally, or order Regulator Vent Tube
Kit GM87489. Drill two 13 mm (0.5 in.) holes,
one on each side the fuel inlet opening in the
enclosure, and route both tubes to the outside.
See Figure 5-9 and Figure 5-10.
Qty. Description Part Number
2
Elbow, 90_, 1/8” NPT x 3/8” hose barb
25-155-38
2 Tubing, 3/8” ID x 9” long, clear flexible
plastic
GM76024
Figure 5-8 Regulator Vent Tube Kit GM87489
GM78090
Dimensions are in mm.
Figure 5-9 Hole Locations for Vent Tubes
1. Elbow fittings 25-155-38, qty. 2
2. Tubing GM76024, qty. 2
3. Route both hoses to the outside through the 13 mm (0.5 in.)
openings in the enclosure (drilled by the installer)
3
sb722
1
2
Figure 5-10 Fuel Regulator Vent Tube Installation
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