Kohler RZ Series

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Operation Manual

Industrial Generator Sets

Models:

6.5RMY

10-18RY/RZ

TP-5631 7/96

Controllers:

Decision-Makert 3, 5-Light

Relay

Table of Contents

Questions and Answers:

M
Michael PowellAug 9, 2025
Why won't my Kohler Portable Generator crank?
- W
  wilsondavidAug 9, 2025
  If your Kohler Portable Generator won't crank, the issue could stem from several causes: * A weak or dead battery: Recharge or replace the battery. Also, check the battery charger's operation. * Reversed or poor battery connections: Inspect the battery charging circuit, including the circuit breaker, module, and wiring (if equipped). * A blown fuse in the controller: Replace the fuse. * A defective starter or starter solenoid: Test their functionality. * A defective start/stop switch (master switch): Test its functionality. * The generator master switch is in the OFF position: Move the master switch to the AUTO position, especially when attempting start-up from a remote switch.
D
David HolmesAug 15, 2025
How to fix a Kohler Portable Generator with no AC output?
- X
  xcollierAug 15, 2025
  If your Kohler Portable Generator has no AC output, here's what you can check: * AC circuit breaker in the OFF position: Place the circuit breaker in the ON position. * AC circuit breaker tripping due to overload: Reduce the load on the generator set. * AC circuit breaker tripping due to a short circuit: Correct the cause of the short circuit. * Voltage regulator fuse blown: Replace the fuse. * Internal generator problem: Contact distributor
R
robertmejiaAug 27, 2025
What causes low output or voltage drop in a Kohler Portable Generator?
- L
  Lauren BaileyAug 27, 2025
  Low output or an excessive voltage drop in your Kohler Portable Generator can be caused by: * The generator set being overloaded: Reduce the load. * Engine speed being too low: Check the governor. * A faulty or misadjusted voltage regulator: Check the voltage regulator adjustment and/or test the voltage regulator. * Internal generator problem: Contact distributor
S
Samuel MartinSep 2, 2025
What causes high output voltage in a Kohler Portable Generator?
- J
  Jordan WoodSep 2, 2025
  High output voltage (or high frequency) in your Kohler Portable Generator can be attributed to: * Loose voltage regulator connections: Check the connections. * A misadjusted governor (leading to high frequency): Check the governor. * A faulty voltage regulator: Check the voltage regulator adjustment and/or test the voltage regulator. * Internal generator problem: Contact distributor

Kohler RZ Series Specifications

General

Brand	Kohler
Model	RZ Series
Category	Portable Generator
Language	English

Summary

Safety Precautions and Instructions

General Hazard Indicators

Key indicators for hazard levels and important notices.

Personal Safety Risks

Risks to personnel from accidental starts, battery, hot components, and moving parts.

System & Environmental Risks

Hazards related to fire, exhaust gases, fuel, and noise pollution.

Electrical & Equipment Risks

Dangers from electrical shock, moving rotors, grounding issues, and improper lifting.

Section 1. Specifications

Controller Features

Section 2. Operation

Prestart & Generator Exercising

Microprocessor Controller Operation

Detailed operation of the 5-light microprocessor controller, including its components.

Fault Shutdowns & Resetting

Identifies shutdown causes and outlines procedures for resetting the controller after faults.

Relay Controller Operation

Section 3. Scheduled Maintenance

Fuel System Maintenance

Battery & Charging System Care

Section 4. Troubleshooting

General Troubleshooting Charts

Comprehensive tables to diagnose and resolve common generator issues.

Section 6. Installation

General Installation Guidelines

Air, Exhaust & Fuel System Setup

Electrical Connections

AC Load Lead Connections

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