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Kubota Z121S - User Manual

Kubota Z121S
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READ AND SAVE THIS MANUAL
OPERATOR'S MANUAL
MODELS Z122E
Z121S
Z125E
Z125S
1BDABDYAP0010
PRINTED IN U.S.A.
©
KUBOTA Corporation 2013
English
Code No. K3011-7123-2
AS . E . 2 - 2 . - . AK

Table of Contents

Questions and Answers

  • Z
    zfitzgeraldNov 9, 2025
    Why is my Kubota Lawn Mower engine difficult to start?
    • K
      Kristen TorresNov 9, 2025
      If your Kubota Lawn Mower engine is difficult to start or won't start, several factors could be at play. Ensure you're sitting on the operator's seat and that the parking brake is correctly applied. Verify that the PTO switch is in the "DISENGAGED" (OFF) position and the motion control levers are in the "NEUTRAL LOCK" position. Also, confirm the key switch is in the "ON" position. Check your fuel level and replace the fuel and fuel filter if the fuel is old or of poor quality. For water or dirt in the fuel system, replace the fuel and consult your Kubota dealer. Clean or replace fuel lines if they are clogged or damaged, or visit your Kubota dealer. A clogged air filter or a defective spark plug can also prevent starting; clean or replace these as needed. Check the spark plug wire connecti...
  • N
    Nicole McmillanNov 19, 2025
    What to do if my Kubota Lawn Mower won't start?
    • O
      Oscar MitchellNov 19, 2025
      If your Kubota Lawn Mower engine is difficult to start or won't start, you should first sit on the operator's seat. Then, make sure the parking brake is applied and the PTO switch is in the "DISENGAGED" (OFF) position. Next, ensure the motion control levers are in "NEUTRAL LOCK" and the key switch is in the "ON" position. Check if you have fuel and replace it along with the fuel filter if it's old. If there's water or dirt, replace the fuel and consult your Kubota dealer. Clean or replace clogged fuel lines, or again, see your Kubota dealer. Clean or replace the air cleaner if it's clogged and adjust or replace the spark plug if defective. Check the spark plug wire connection and replace any blown fuses. Use the correct engine oil viscosity for the temperature. Clean battery cables if the ...
  • R
    rebecca73Dec 1, 2025
    How to troubleshoot starting issues with a Kubota Lawn Mower?
    • J
      James RuizDec 1, 2025
      To troubleshoot a Kubota Lawn Mower engine that is difficult to start, begin by ensuring you are sitting on the operator's seat and the parking brake is applied. Next, verify that the PTO switch is in the "DISENGAGED" (OFF) position and the motion control levers are in the "NEUTRAL LOCK" position. Confirm that the key switch is in the "ON" position and that there is sufficient fuel. If the fuel is old, replace it along with the fuel filter. If there is water or dirt in the fuel system, replace the fuel and consult your Kubota dealer. Clean or replace any clogged or damaged fuel lines, or consult your Kubota dealer. Clean or replace a clogged air cleaner. Adjust or replace a defective spark plug, and check the spark plug wire connection. Replace any blown fuses. Use the appropriate engine o...

Summary

FOREWORD

SAFETY FIRST

Explains the industry's "Safety Alert Symbol" and its meaning for warnings.

SAFE OPERATION

BEFORE OPERATING

OPERATING

Guidelines for safe operation during mowing, including starting, working, and handling children.

Operation on slopes

Critical safety procedures for operating the machine on inclines to prevent tip-overs and loss of control.

SERVICING OF MACHINE

INSTRUMENT PANEL AND CONTROLS

MOWER MOUNTING

MOUNTING THE MOWER DECK

Step-by-step instructions for attaching the mower deck to the machine safely.

OPERATING THE ENGINE

STARTING THE ENGINE

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

CHECK DURING OPERATING

JUMP STARTING

STOPPING THE ENGINE

Proper procedures for shutting down the engine safely, including fuel valve operation.

OPERATING THE MACHINE

OPERATING NEW MACHINE

Guidelines for breaking in a new machine to ensure maximum performance and longevity.

STARTING

Motion Control Lever

Detailed explanation of how to use the motion control levers for steering and speed control.

STOPPING

Procedures for safely stopping the machine, including parking and engine shutdown.

OPERATING THE MOWER

ADJUSTING CUTTING HEIGHT

PERIODIC SERVICE

SERVICE INTERVALS

Changing Engine Oil (Z122 E, Z125 E)

Checking and Replacing Blade

Mower Belt Replacement

ADJUSTMENT

MOTION CONTROL LEVER

Instructions for adjusting the motion control levers for proper operation and safety.

MOTION CONTROL LEVER ALIGNMENT

MOWER DECK LEVEL

LEVEL MOWER DECK (Side-to-Side)

LEVEL MOWER DECK (Front-to-Rear)

TROUBLESHOOTING

ENGINE TROUBLESHOOTING

A guide to diagnosing and resolving common engine problems and their causes.

BATTERY TROUBLESHOOTING

MACHINE TROUBLESHOOTING

MOWER TROUBLESHOOTING

Solutions for common mower performance issues such as blade rotation, cut quality, and vibration.

Kubota Z121S Specifications

General IconGeneral
Engine TypeGasoline
Horsepower21.5 HP
TransmissionHydrostatic
Deck MaterialSteel
Displacement726 cc
Cutting Height1.5 - 4.5 inches
Cylinders2
Turning RadiusZero-turn
Forward Speed0 - 8.0 mph
Reverse Speed0 - 4.0 mph

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