Kohler 14RESA Troubleshooting Manual - Page 4

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Also for Kohler 14RESA: Installation Instructions (4 pages), Installation Instructions (2 pages), Operation (20 pages), Installation And Operation Instruction Manual (37 pages)

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Engine Hunting

Models 20RES, 20RESL, 20RESA, and 20RESAL

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 under what conditions the generator

hunts. No load? Loaded? 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 (4.09 or higher for the RDC2,

RESA/RESAL; 3.15 or higher for the RDC,

RES/RESL). The Kohler Generator Service

Department will provide the most current

version if it is not yet available on TechTools.

b. Install vent tubes on the two reference ports on

the fuel regulator. Procure the parts shown in

Figure 1 locally, or order Regulator Vent Tube

kit GM87489. Route both tubes to the outside

through the customer connection openings in

the enclosure. See Figure 2.

If the unit still hunts after performing these steps,

continue following the troubleshooting steps

below.

4. Use SiteTech to check the Engine Speed Gain

Adjustment setting. The default setting is 50 and it

normally is not adjusted.

a. If the setting is different, reset to 50 and run the

engine again.

b. If the setting is 50, change the value in

downward increments of 5. Note the effect that

the change has on the speed of the hunting.

c. If decreasing the setting is not effective, reset to

50 and increase in increments of 5.

5. Check the air intake tube that runs from the filter

housing to the controller J-box. Is the tube seated

properly on the filter housing? Is the grommet

completely inserted in the housing?

a. No? Adjust tubing and grommet as needed.

b. Yes? Proceed to the next step.

6. Verify that the unit is set up for the proper fuel

source. See the generator set Installation Manual

for instructions.

LPG: Insert orifice and disconnect DSAI leads.

NG: Remove orifice and connect DSAI leads.

7. Is fuel pressure from the source steady and at

acceptable levels during all phases of operation?

Verify the minimum and maximum fuel pressures

with the spec sheet. Pressure should not vary more

than 10% from static pressure when starting and

accepting full load.

a. If the pressure varies more than 10% during

operation, check the fuel supply and adjust as

needed.

b. If the pressure is steady, proceed to the next

step.

Qty. Description

Elbow, 90_, 1/8"NPT x 3/8" hose barb

Tubing, 3/8" ID x 9" long, clear flexible

plastic

Figure 1 Regulator Vent Tube Kit GM87489

1. Elbow fittings 25-155-38, qty. 2

2. Tubing GM76024, qty. 2

3. Route both hoses to the outside through the existing

openings in the enclosure

Figure 2 Fuel Regulator Vent Tube Installation

Part Number

25-155-38

GM76024

sb722

SB-722

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