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Kubota Z231KH-AU - User Manual

Kubota Z231KH-AU
85 pages
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AY . A . 2 - 2 . - . AK
PRINTED IN U.S.A.
©
KUBOTA Corporation 2019
English (Australia)
Code No. K3014-7127-1
Z231BR
-
AU·Z231KH
-
AU·Z251BR
-
AU·Z251KH
-
AU
OPERATOR'S MANUAL
READ AND SAVE THIS MANUAL
1WNAM00001A01
MODELS Z231BR-AU
Z231KH-AU
Z251BR-AU
Z251KH-AU

Table of Contents

Questions and Answers

  • N
    nzimmermanNov 21, 2025
    Why is my Kubota Lawn Mower engine difficult to start?
    • M
      Melissa KleinNov 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 ...
  • Y
    yhayesAug 25, 2025
    What to do if my Kubota Z231KH-AU Lawn Mower engine overheats?
    • R
      Rachel MoralesAug 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.
  • B
    brian03Aug 27, 2025
    Why are the exhaust fumes from my Kubota Z231KH-AU black?
    • C
      Cody GeorgeAug 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
    Raven BauerAug 27, 2025
    What to do if Kubota Lawn Mower engine stops suddenly?
    • M
      Maureen HurstAug 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
    Bryan RiceAug 28, 2025
    How to troubleshoot an uneven cut with my Kubota Z231KH-AU?
    • P
      Phyllis CantuAug 29, 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.
  • C
    Christopher BauerSep 15, 2025
    What to do if the blades on my Kubota Z231KH-AU Lawn Mower do not rotate?
    • T
      Terri TerrySep 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.
  • C
    Candice BauerSep 13, 2025
    Why are the exhaust fumes from my Kubota Z231KH-AU Lawn Mower white or blue?
    • R
      richard18Sep 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.
  • L
    Lori CardenasSep 14, 2025
    What causes corroded and heated terminals on my Kubota Lawn Mower?
    • V
      Vanessa WilliamsSep 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.
  • B
    Barbara MackSep 6, 2025
    Why does my Kubota Lawn Mower load down the machine?
    • J
      jennifer89Sep 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.
  • M
    michaelavilaSep 3, 2025
    How to reduce excessive vibration in my Kubota Z231KH-AU?
    • T
      Tyler JacksonSep 4, 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

Safe Operation

Before Operating the Machine

Read and understand the manual and safety labels before operating the machine.

Starting to Operate the Machine

Working the Machine

Stopping the Machine

Instrument Panel and Controls

Mower Mounting

Operating the Engine

Starting the Engine

Procedures for safely starting the engine, including pre-start checks.

Stopping the Engine

Correct steps to safely shut down the engine.

Operating the Machine

Starting the Machine

Steps to prepare and start the machine for operation.

Motion Control Lever

How to use the motion control levers for steering and speed.

Operating the Mower

Adjusting the Cutting Height

Maintenance

Service Intervals

Periodic Service

Daily Check

Checking the Engine Oil Level

Procedure for checking and maintaining the correct engine oil level.

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

Procedure for changing the engine oil on specific models.

Replacing Transaxle Oil Filter

Adjustment

Motion Control Lever

Mower Deck Level

Storage

Troubleshooting

Engine Troubleshooting

Common engine problems and their solutions.

Mower Troubleshooting

Solutions for issues related to mower deck and blade performance.

Kubota Z231KH-AU Specifications

General IconGeneral
Engine TypeGasoline
Engine Power21.5 HP
Displacement726 cc
Cutting Width48 inches
TransmissionHydrostatic
Cutting Height Range1.5 - 4.5 inches
Deck MaterialSteel
Starter TypeElectric
Battery12V
Speed Range0-8 mph
Wheel Size (Front)13 x 5 inches
Wheel Size (Rear)20x10.00-8

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