Kubota Z231BR-AU - User Manual

Questions and Answers

C
Christopher PayneNov 21, 2025
Why is my Kubota Z231BR-AU engine difficult to start?
- B
  bhannaNov 21, 2025
  There are several reasons why your Kubota Lawn Mower engine might be difficult to start. Here are a few things to check: * Ensure you are sitting on the operator's seat. * Make sure the parking brake is applied. * Verify the PTO switch is in the “DISENGAGED” (OFF) position. * Confirm the motion control levers are in the “NEUTRAL LOCK” position. * Check that the key switch is in the “ON” position. * Ensure there is enough fuel in the tank. Other potential causes include improper or stale fuel, water or dirt in the fuel system, a clogged fuel hose or filter, a clogged air cleaner, a damaged spark plug, a blown fuse, incorrect engine oil viscosity, or a weak battery. Clean battery cables and terminals. In cold weather, always remove the battery from the engine, charge and store ...
M
Mark YoungAug 25, 2025
What to do if my Kubota Z231BR-AU Lawn Mower engine overheats?
- A
  amy29Aug 26, 2025
  If your Kubota Lawn Mower engine overheats, first, check if the engine is overloaded and lower the speed or reduce the load. Ensure the engine oil level is sufficient and fill if needed. Clean the engine air intake screen and cooling fins. Also, clean or replace the air cleaner paper element. Make sure you operate at “FAST” speed and reduce the operating ground speed.
P
Paul MillerAug 26, 2025
Why are the exhaust fumes from my Kubota Lawn Mower black?
- C
  Christine HowardAug 27, 2025
  If the exhaust fumes from your Kubota Lawn Mower are black, dark, or gray, it could be due to an overload. Reduce the load. Another cause might be low-grade fuel, so use the specified fuel. Check the fuel filter and replace it if clogged. Also, clean or replace the air cleaner paper element and check the choke position to ensure it is fully opened.
R
Richard LunaAug 27, 2025
What to do if Kubota Z231BR-AU engine stops suddenly?
- R
  Robert MoyerAug 27, 2025
  If your Kubota Lawn Mower engine stops suddenly, first, refuel the engine. Also, check the fuel valve and carburetor fuel valve positions.
B
browndanielleAug 28, 2025
How to troubleshoot an uneven cut with my Kubota Lawn Mower?
- G
  Gregory LopezAug 28, 2025
  To troubleshoot an uneven cut with your Kubota Lawn Mower, start by leveling the mower deck. Reduce your ground speed. Sharpen dull blades or replace worn or damaged blades. Ensure proper tire inflation. Adjust the anti-scalp rollers, and set both tire pressures to the correct level.
H
hortonpatrickSep 15, 2025
What to do if the blades on my Kubota Lawn Mower do not rotate?
- V
  Victoria HarrisSep 15, 2025
  If the blades on your Kubota Lawn Mower do not rotate, consult your local KUBOTA Dealer because the PTO system is not normal: PTO system malfunctioning. If the PTO system is normal, replace the broken mower belt.
V
Vanessa GrahamSep 13, 2025
Why are the exhaust fumes from my Kubota Z231BR-AU Lawn Mower white or blue?
- M
  Mr. Bill CruzSep 13, 2025
  If the exhaust fumes from your Kubota Lawn Mower are white or blue, it may be due to excessive engine oil. Reduce the oil to the specified level. If the problem persists, consult your KUBOTA Dealer as it could be a worn or stuck piston ring.
M
Michelle RichardsonSep 14, 2025
What causes corroded and heated terminals on my Kubota Z231BR-AU Lawn Mower?
- A
  Amy TylerSep 14, 2025
  Severely corroded and heated terminals on your Kubota Lawn Mower are often due to a poor terminal connection. Clean the terminal and tighten it securely.
A
Antonio GillSep 6, 2025
Why does my Kubota Z231BR-AU load down the machine?
- C
  Charles WhiteSep 6, 2025
  If your Kubota Lawn Mower loads down the machine, ensure you mow at full throttle and check/reset the engine rpm. Slow down your ground speed. Clean any debris wrapped around the mower spindles. Adjust the mower deck if the front is too low.
L
laceyhernandezSep 3, 2025
How to reduce excessive vibration in my Kubota Lawn Mower?
- J
  James HicksSep 3, 2025
  To reduce excessive vibration in your Kubota Lawn Mower, begin by cleaning the mower deck and pulleys to remove any debris. Replace the mower belt if it's damaged. If the pulleys are damaged, replace them. Check the pulleys for proper alignment and balance the blades.

Summary

Safety First: Warning Level Definitions

Safe Operation: General and Pre-Operation Checks

Before Operating the Machine

General precautions and checks to perform before starting the machine operation.

ROPS and Seat Belt Usage

Recommends the use of ROPS and seat belt for operator safety.

Safe Operation: Children, Slopes, Stopping, Transporting

Safety for Children and Elderly Operators

Precautions for operating safely around children and for older operators.

Operating on Slopes and Stopping the Machine

Guidelines for safe operation on inclines and proper machine shutdown procedures.

Safety Labels on the Machine

Machine Specifications Overview

Specification Table

Detailed technical specifications for different Kubota mower models.

Instrument Panel and Controls

Mower Deck Mounting Procedures

Operating the Engine Safely

Starting the Engine

Instructions and safety checks for starting the engine.

Engine Operation: Throttle, Key, and Warm-up

Throttle Lever Operation

How to use the throttle lever for engine speed control and choke engagement.

Key Switch and Starting Procedure

Operation of the key switch and the importance of interlocks for starting.

Stopping the Engine and Operating Checks

Stopping the Engine

Steps for safely shutting down the engine and securing the machine.

Checks During Operation

Engine Operation: Cold Start and Warm-up

Cold Weather Starting

Procedures for starting the engine in cold ambient temperatures.

Warming Up the Engine

Importance of warming up the engine and transmission oil, especially in low temperatures.

Operating a New Machine and Engine Break-in

Engine Break-in Procedures

Starting the Machine Controls: Seat and Belt

Operators Seat and Belt Adjustment

Machine Starting Controls: Lights, Pedals, and Levers

Mower Lift Pedal and Throttle Lever

Operation of the mower lift pedal and throttle lever for deck control and engine speed.

Machine Operation: Motion Control Levers

Motion Control Lever Positions

Explanation of neutral lock and neutral positions for motion control levers.

Operating the Motion Control Levers

How to use motion control levers for steering and speed.

Mowing Tips and Cutting Height Adjustment

Mowing Tips

Adjusting the Cutting Height

Instructions on how to set the desired cutting height for the mower deck.

Maintenance Service Intervals

Daily Checks for Machine Condition

Checking Engine Oil Level

Procedure for checking the engine oil level and adding oil if necessary.

Daily Checks: Fuel and Air Intake

Checking Fuel Amount and Refueling

Safe procedures for checking fuel levels and refueling the machine.

Checking and Cleaning Air Intake Screen

Periodic Service: Engine Start and OPC System Checks

Checking Engine Start System

Checking the OPC System

Periodic Service: Engine Oil Changes

Changing Engine Oil (Z231 BR-AU, Z251 BR-AU)

Periodic Service: Engine Oil Filter Replacement

Periodic Service: Battery Charging and Storage

Charging the Battery

Periodic Service: Engine Oil Filter Replacement (Z231 KH-AU, Z251 KH-AU)

Periodic Service: Transaxle Maintenance

Replacing Transaxle Oil Filter

Troubleshooting: Engine Issues

Troubleshooting: Battery and Machine Issues

Battery Troubleshooting

Machine Troubleshooting

Troubleshooting: Mower Performance

Summary

Safety First: Warning Level Definitions

Safe Operation: General and Pre-Operation Checks

Before Operating the Machine

General precautions and checks to perform before starting the machine operation.

ROPS and Seat Belt Usage

Recommends the use of ROPS and seat belt for operator safety.

Safe Operation: Children, Slopes, Stopping, Transporting

Safety for Children and Elderly Operators

Precautions for operating safely around children and for older operators.

Operating on Slopes and Stopping the Machine

Guidelines for safe operation on inclines and proper machine shutdown procedures.

Safety Labels on the Machine

Machine Specifications Overview

Specification Table

Detailed technical specifications for different Kubota mower models.

Instrument Panel and Controls

Mower Deck Mounting Procedures

Operating the Engine Safely

Starting the Engine

Instructions and safety checks for starting the engine.

Engine Operation: Throttle, Key, and Warm-up

Throttle Lever Operation

How to use the throttle lever for engine speed control and choke engagement.

Key Switch and Starting Procedure

Operation of the key switch and the importance of interlocks for starting.

Stopping the Engine and Operating Checks

Stopping the Engine

Steps for safely shutting down the engine and securing the machine.

Checks During Operation

Engine Operation: Cold Start and Warm-up

Cold Weather Starting

Procedures for starting the engine in cold ambient temperatures.

Warming Up the Engine

Importance of warming up the engine and transmission oil, especially in low temperatures.

Operating a New Machine and Engine Break-in

Engine Break-in Procedures

Starting the Machine Controls: Seat and Belt

Operators Seat and Belt Adjustment

Machine Starting Controls: Lights, Pedals, and Levers

Mower Lift Pedal and Throttle Lever

Operation of the mower lift pedal and throttle lever for deck control and engine speed.

Machine Operation: Motion Control Levers

Motion Control Lever Positions

Explanation of neutral lock and neutral positions for motion control levers.

Operating the Motion Control Levers

How to use motion control levers for steering and speed.

Mowing Tips and Cutting Height Adjustment

Mowing Tips

Adjusting the Cutting Height

Instructions on how to set the desired cutting height for the mower deck.

Maintenance Service Intervals

Daily Checks for Machine Condition

Checking Engine Oil Level

Procedure for checking the engine oil level and adding oil if necessary.

Daily Checks: Fuel and Air Intake

Checking Fuel Amount and Refueling

Safe procedures for checking fuel levels and refueling the machine.

Checking and Cleaning Air Intake Screen

Periodic Service: Engine Start and OPC System Checks

Checking Engine Start System

Checking the OPC System

Periodic Service: Engine Oil Changes

Changing Engine Oil (Z231 BR-AU, Z251 BR-AU)

Periodic Service: Engine Oil Filter Replacement

Periodic Service: Battery Charging and Storage

Charging the Battery

Periodic Service: Engine Oil Filter Replacement (Z231 KH-AU, Z251 KH-AU)

Periodic Service: Transaxle Maintenance

Replacing Transaxle Oil Filter

Troubleshooting: Engine Issues

Troubleshooting: Battery and Machine Issues

Battery Troubleshooting

Machine Troubleshooting

Troubleshooting: Mower Performance

Kubota Z231BR-AU Specifications

General

Brand	Kubota
Model	Z231BR-AU
Category	Lawn Mower
Language	English

Related product manuals

Kubota Z231BR-AU - User Manual

Table of Contents

Questions and Answers

Summary

Safety First: Warning Level Definitions

Safe Operation: General and Pre-Operation Checks

Before Operating the Machine

ROPS and Seat Belt Usage

Safe Operation: Children, Slopes, Stopping, Transporting

Safety for Children and Elderly Operators

Operating on Slopes and Stopping the Machine

Safety Labels on the Machine

Machine Specifications Overview

Specification Table

Instrument Panel and Controls

Mower Deck Mounting Procedures

Operating the Engine Safely

Starting the Engine

Engine Operation: Throttle, Key, and Warm-up

Throttle Lever Operation

Key Switch and Starting Procedure

Stopping the Engine and Operating Checks

Stopping the Engine

Checks During Operation

Engine Operation: Cold Start and Warm-up

Cold Weather Starting

Warming Up the Engine

Operating a New Machine and Engine Break-in

Engine Break-in Procedures

Starting the Machine Controls: Seat and Belt

Operators Seat and Belt Adjustment

Machine Starting Controls: Lights, Pedals, and Levers

Mower Lift Pedal and Throttle Lever

Machine Operation: Motion Control Levers

Motion Control Lever Positions

Operating the Motion Control Levers

Mowing Tips and Cutting Height Adjustment

Mowing Tips

Adjusting the Cutting Height

Maintenance Service Intervals

Daily Checks for Machine Condition

Checking Engine Oil Level

Daily Checks: Fuel and Air Intake

Checking Fuel Amount and Refueling

Checking and Cleaning Air Intake Screen

Periodic Service: Engine Start and OPC System Checks

Checking Engine Start System

Checking the OPC System

Periodic Service: Engine Oil Changes

Changing Engine Oil (Z231 BR-AU, Z251 BR-AU)

Periodic Service: Engine Oil Filter Replacement

Periodic Service: Battery Charging and Storage

Charging the Battery

Periodic Service: Engine Oil Filter Replacement (Z231 KH-AU, Z251 KH-AU)

Periodic Service: Transaxle Maintenance

Replacing Transaxle Oil Filter

Troubleshooting: Engine Issues

Troubleshooting: Battery and Machine Issues

Battery Troubleshooting

Machine Troubleshooting

Troubleshooting: Mower Performance

Summary

Safety First: Warning Level Definitions

Safe Operation: General and Pre-Operation Checks

Before Operating the Machine

ROPS and Seat Belt Usage

Safe Operation: Children, Slopes, Stopping, Transporting

Safety for Children and Elderly Operators

Operating on Slopes and Stopping the Machine

Safety Labels on the Machine

Machine Specifications Overview

Specification Table

Instrument Panel and Controls

Mower Deck Mounting Procedures

Operating the Engine Safely

Starting the Engine

Engine Operation: Throttle, Key, and Warm-up

Throttle Lever Operation

Key Switch and Starting Procedure

Stopping the Engine and Operating Checks