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Kubota ZD21F - User Manual

Kubota ZD21F
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ZD18
(
F
)
,ZD21
(
F
),
ZD25F,ZD28
(
F
)
WORKSHOP MANUAL
ZERO TURN MOWER
KiSC issued 04, 2009 A

Table of Contents

Questions and Answers

  • S
    Sherri BeltranAug 19, 2025
    What to do if Kubota Lawn Mower has low oil pressure?
    • N
      nsimonAug 19, 2025
      If you're experiencing low oil pressure, you can replenish the engine oil, clean the oil strainer, change the engine oil filter cartridge, clean or replace the relief valve, replace the relief valve spring, replace the main bearings, metals, or crankshaft, replace the crankpin bearings, replace the rocker arms, rocker arm brackets, or rocker arm shaft, clean the oil passage, use the specified type of oil, or repair or replace the oil pump.
  • J
    Julie AustinAug 22, 2025
    What to do if Kubota Lawn Mower engine overheated?
    • B
      bsanchezAug 22, 2025
      If your engine is overheating, try these solutions: Replenish engine oil, replace the fan belt or adjust the fan belt tension, replenish coolant, clean the radiator net and radiator fin, clean inside of radiator or replace radiator, clean or replace coolant flow route or replace the radiator cap. Also, loosen the load, replace the head gasket, adjust the injection timing, or use the specified fuel.
  • M
    Michael WilsonAug 26, 2025
    What to do if Kubota Lawn Mower has deficient output?
    • A
      Amber MurphyAug 26, 2025
      If you notice deficient output, you can adjust the injection timing, repair or replace the engine’s moving parts, repair or replace the injection pump, repair or replace the nozzle, or replace the head gasket and tighten the cylinder head screws, glow plugs, and nozzle holders.
  • C
    Cheyenne McconnellAug 27, 2025
    What to do if Kubota ZD21F engine revolution is not smooth?
    • P
      Paul FullerAug 27, 2025
      If the engine revolution isn't smooth, try replacing the fuel filter, cleaning or replacing the air cleaner element, tightening the retaining nut, repairing or replacing the injection pump, adjusting the nozzle injection pressure, repairing or replacing the injection nozzle, or repairing the governor.
  • C
    Charles TrevinoAug 30, 2025
    Why Kubota ZD21F has excessive lubricant oil consumption?
    • N
      Nicole LinAug 30, 2025
      If there is excessive lubricant oil consumption, consider shifting the ring gap direction, replacing the oil ring, replacing the piston, replacing the valve and valve guide, or replacing defective seals or packing.
  • J
    Jaime BrownSep 2, 2025
    What to do if Kubota ZD21F Lawn Mower emits black or dark gray exhaust gas?
    • B
      Beth GordonSep 2, 2025
      If you observe black or dark gray exhaust gas, you can lessen the load, use the specified fuel, replace the fuel filter, clean or replace the air cleaner element or repair or replace the nozzle.
  • A
    Anthony DonaldsonSep 5, 2025
    What to do if Kubota ZD21F has fuel mixed into lubricant oil?
    • K
      kennedyellenSep 5, 2025
      If fuel is mixed into the lubricant oil, you can replace the pump element or injection pump, repair or replace the nozzle, or replace the injection pump.
  • D
    Donald OlsenSep 7, 2025
    What to do if Kubota Lawn Mower emits white or blue exhaust gas?
    • L
      Lawrence MorrisonSep 8, 2025
      If you observe white or blue exhaust gas, you can reduce to the specified engine oil level, repair the piston ring and bore oversize piston, adjust the injection timing, or replace each bearings.
  • K
    Kimberly FernandezSep 10, 2025
    What to do if Kubota Lawn Mower has high oil pressure?
    • J
      Joseph FloresSep 12, 2025
      If there is high oil pressure, you can use the specified type of oil or replace the relief valve.
  • M
    Megan RothSep 13, 2025
    What to do if Kubota Lawn Mower has water mixed into lubricant oil?
    • J
      Jeremy OconnorSep 13, 2025
      If water is mixed into the lubricant oil, you can replace the head gasket or replace the cylinder block or cylinder head.

Summary

Safety Instructions

Safety First

This symbol warns of the possibility of personal injury. Read instructions carefully before repair or use.

Before Servicing and Repairing

Specifications

Engine Specifications

Details on engine model, type, cylinders, bore, stroke, displacement, rated revolution, and combustion chamber.

Capacities

Specifies capacities for fuel tank, engine crankcase, coolant, recovery tank, transmission, and gear cases.

Tire Specifications

Traveling Speed Specifications

Dimensions

Provides overall length, width, height, wheel base, tread, and weight with mower deck for different models.

G GENERAL

1. IDENTIFICATION

Information on how to identify machine, engine, and mower serial numbers and hour meter reading.

2. GENERAL PRECAUTIONS

Guidelines for disassembly, tool usage, electrical wiring, part handling, and fluid usage to ensure safety and performance.

3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING

Safety guidelines for handling electrical components and wiring to prevent damage and ensure proper function.

4. LUBRICANTS, FUEL AND COOLANT

Table detailing capacities and recommended lubricants, fuel, and coolant for different models.

5. TIGHTENING TORQUES

Specified tightening torques for various screws, bolts, and nuts based on material and grade.

[1] GENERAL USE SCREWS, BOLTS AND NUTS

[2] METRIC SCREWS, BOLTS AND NUTS

6. MAINTENANCE CHECK LIST

Comprehensive check list for periodic maintenance intervals (50, 100, 200, 400 hours, 1, 2 years).

7. CHECK AND MAINTENANCE

Procedures for routine checks and maintenance tasks.

[1] DAILY CHECK

Items to check before starting to prevent trouble: walk-around, fluid levels, tire pressure, damage, hardware tightness.

[2] CHECK POINTS OF INITIAL 50 HOURS

ENGINE

2. SERVICING SPECIFICATIONS [D722-E-XFM5, D782-E-XFM5]

Specifications for engine components including cylinder head, valves, piston, crankshaft, and gears.

3. SERVICING SPECIFICATIONS [D1105-E-ZD]

Specifications for engine components including cylinder head, valves, piston, crankshaft, and gears for D1105 engine.

[1] ENGINE BODY

Specifications for engine body components including cylinder head, valves, piston, crankshaft, and gears for D1105 engine.

4. TIGHTENING TORQUES

Specified tightening torques for various engine screws, bolts, and nuts for D722/D782 and D1105 engines.

5. CHECKING, DISASSEMBLING AND SERVICING

Procedures for checking, disassembling, and servicing engine components.

[1] SEPARATING ENGINE

Procedures for draining engine oil and coolant, and battery/bonnet removal.

[2] ENGINE BODY

Procedures for checking and adjusting engine body components.

(1) Checking and Adjusting

Procedures for checking and adjusting engine compression pressure, top clearance, and valve clearance.

(2) Disassembling and Assembling

Procedures for disassembling and assembling cylinder head, injection pipes, nozzle holders, rocker arms, and crankshaft.

TRANSAXLE

2. TRAVELLING SYSTEM

Explanation of the transaxle's travelling system, primarily the hydrostatic transmission.

[1] HYDROSTATIC TRANSMISSION

Detailed breakdown of the hydrostatic transmission's structure, pump, motor, valves, and operation.

(1) Structure

(2) Pump and Motor

(4) Check and High Pressure Relief Valve

(6) Power Trains Operation

(9) PTO System

5. DISASSEMBLING AND ASSEMBLING

Procedures for disassembling and assembling the transaxle assembly.

[1] SEPARATING TRANSAXLE

Procedures for draining transmission fluid, handling the battery, and separating the transaxle assembly.

FRONT AXLE

1. STRUCTURE

Description of the front axle construction, emphasizing its simple shape and center pin support for stable steering.

HYDRAULIC SYSTEM

1. HYDRAULIC CIRCUIT

Diagram illustrating the hydraulic system components and their interconnections, including pump, control valve, cylinder, and PTO clutch.

2. HYDRAULIC PUMP

3. HYDRAULIC CONTROL VALVE AND VALVE ADAPTOR

Explanation of the hydraulic system's control valve, adaptor, and lift cylinder operation for mower functions.

3. CHECKING, DISASSEMBLING AND SERVICING

Procedures for checking, disassembling, and servicing the hydraulic control valve, pump, and cylinder.

[1] HYDRAULIC CONTROL VALVE, PUMP AND CYLINDER

(1) Checking and Adjusting

(2) Disassembling and Assembling

ELECTRICAL SYSTEM

1. WIRING DIAGRAM

Wiring diagram for ZD18(F)/ZD21(F) and ZD28(F) models, showing component connections and color codes.

2. STARTING SYSTEM

Explanation of the starting system operation, including glow plugs, main switch, and starter motor.

[ZD18(F) · ZD21(F)]

[ZD28(F)]

3. CHARGING SYSTEM

Explanation of the charging system, consisting of an AC dynamo and regulator, supplying power and charging the battery.

[1] BATTERY

[2] STARTING SYSTEM

[3] CHARGING SYSTEM

ROTARY MOWER

1. POWER TRANSMISSION

1. TROUBLESHOOTING

Troubleshooting guide for common mower issues like blades not turning, slow speed, poor cutting, and mower not lifting.

2. SERVICING SPECIFICATIONS

Specifications for pinion shaft turning force/torque, bevel gear backlash, and blade tip differences.

3. TIGHTENING TORQUES

Specified tightening torques for mower components like blade screws, gear box, pulley holders, and mounting nuts.

4. CHECKING, DISASSEMBLING AND SERVICING

Procedures for checking, disassembling, and servicing the rotary mower.

[1] CHECKING AND ADJUSTING

Procedure for adjusting anti-scalp rollers and checking mower deck cutting height for left/right and front/rear balance.

[2] DISASSEMBLING AND ASSEMBLING

Steps for disassembling and assembling universal joints, belt covers, mower blades, blade boss, and gear box.

Kubota ZD21F Specifications

General IconGeneral
BrandKubota
ModelZD21F
CategoryLawn Mower
LanguageEnglish

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