Toro 52in Z Master Professional 2000 Series Riding Mower User manual

Brand: Toro

Model: 52in Z Master Professional 2000 Series Riding Mower

Type: User manual

This manual is also suitable for

48in Z Master Professional 2000 Series Riding Mower

Form No. 3460-328 Rev A

2000 Series Z MASTER ® Service

Manual

Published: May 2023

Revision History

Revision History Page 2 2000 Series Z MASTER®Service Manual

3460-328 Rev A

Preface

This service manual was written expressly for T oro service technicians. The T oro Company has made

every ef fort to make the information in this manual complete and correct.

Basic shop safety knowledge and mechanical/electrical skills are assumed. The T able of Contents lists

the systems and the related topics covered in this manual.

W e are hopeful that you will nd this manual a valuable addition to your service shop. If you have any

questions or comments regarding this manual, please contact us at the following address:

The T oro Company

RLC/SWS Customer Care Department

81 1 1 L yndale A venue South

Bloomington, MN 55420

The T oro Company reserves the right to change product specications or make changes to this manual

without notice.

2000 Series Z MASTER®Service Manual Page 3 Preface

3460-328 Rev A

Service Procedure Icons

The following icons appear throughout this Service Manual to bring attention to

specic important details of a service procedure.

Critical Process

This icon is used to highlight:

•Installing safety equipment (shields, guards, seat belts, brakes, and R.O.P .S.

components) that may have been removed

•Dimensions or settings that must be maintained for proper machine operation

•A specic fastener tightening sequence

•Component orientation that may not be obvious

Critical T orque

This icon is used to highlight an assembly torque requirement that is dif ferent

than what is recommended in the Standard T orque T ables.

Fluid Specications

This icon is used to highlight uid specications and capacities that are less

common, and may not appear on the machine service decal or in the machine

Operator ’ s Manual.

Note: Refer to the service decal on the machine and the machine Operator ’ s

Manual for commonly used uid specications and capacities.

Preface Page 4 2000 Series Z MASTER®Service Manual

3460-328 Rev A

T able of Contents
Preface ................................................................................................................ 3
Chapter 1: Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1– 1
Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1– 2
Chapter 2: Specications and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2– 1
Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2– 2
T orque Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2– 4
Chapter 3: T roubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3– 1
General T roubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3– 3
Chapter 4: Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4– 1
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4– 2
Service and Repairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4– 3
Chapter 5: Deck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5– 1
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5– 2
Service and Repairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5– 3
Chapter 6: Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6– 1
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6– 2
Service and Repairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6– 3
Chapter 7: Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7– 1
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7– 2
Service and Repairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7– 3
Chapter 8: Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8– 1
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8– 2
Service and Repairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8– 3
Appendix A ......................................................................................................A– 1
Electrical Drawing Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A– 2
T ORO Engine Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A– 3
T ORO Engine Powered Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A– 4
Kawasaki Engine Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A– 5
Kawasaki Engine Powered Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A– 6
Briggs & Straton Engine Schemaitc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A– 7
Briggs & Straton Engine Powered Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A– 8
2000 Series Z MASTER®Service Manual Page 5 Preface
3460-328 Rev A

Preface Page 6 2000 Series Z MASTER®Service Manual

3460-328 Rev A

Chapter 1

Safety

T able of Contents

Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1– 2

Think Safety First . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1– 2

2000 Series Z MASTER®Service Manual Page 1–1

Safety

3460-328 Rev A

Safety Instructions

DANGER

This safety symbol means danger . When you see this symbol,

carefully read the instructions that follow . Failure to obey the

instructions could cause serious permanent injury , disability , or

death.

W ARNING

This safety symbol means warning. When you see this symbol,

carefully read the instructions that follow . Failure to obey the

instructions could result in serious injury .

CAUTION

This safety symbol means caution. When you see this symbol,

carefully read the instructions that follow . Failure to obey the

instructions may result in minor to moderate injury .

IMPORT ANT

The Important notice will give the important instructions which you

must follow to prevent damage to the systems or components on

the machine.

Note: ANote will give the general information about the correct operation,

maintenance, service, testing, or repair of the machine.

Think Safety First

T oro Products are evaluated for compliance with existing safety standards and

specications. Although hazard control and accident prevention are partially

dependent upon the design and conguration of the machine, hazard control

and accident prevention are also dependent upon the awareness, concern

and proper training of the personnel involved in the operation, transport,

maintenance, and storage of the machine. Improper use or maintenance of the

machine can result in injury or death.

W ARNING

T o reduce the potential of injury or death, comply with the safety

instructions in this manual, as well as information found in the

Operator ’ s Manuals and the Operator and Safety T raining Materials

found on www .toro.com .

•A void unexpected starting of the machine…

Safety: Safety Instructions

Page 1–2 2000 Series Z MASTER®Service Manual

3460-328 Rev A

Think Safety First (continued)

Always turn of f the machine, remove the key and unplug the battery or

operate the disconnect device before cleaning, adjusting, or repair . Refer

to the machine’ s operator ’ s manual for procedure.

•A void lacerations and amputations…

Stay clear of all moving parts whenever the machine is running. T reat all

normally moving parts as if they were moving whenever the machine is

running or has the potential to start.

•A void burns…

Do not touch the machine, or other exhaust components such as the

muf er , which may be hot during operation, while the unit is running or

shortly after is has been running. Allow the machine and other exhaust

components to cool before working near them.

•A void res and explosions…

Use extreme care in handling fuel. Fuel is ammable and its vapors are

explosive.

– Extinguish all cigarettes, cigars, pipes, and other sources of ignition.

– A void spilling fuel and never smoke while working with any type of fuel

or lubricant.

– Wipe up any spilled fuel or oil immediately .

– Never remove the fuel cap or add fuel when the machine is running.

– Always use approved, labeled containers for storing or transporting fuel

and lubricants.

– Do not add or drain fuel in an enclosed space.

– Do not store the machine or fuel container where there is an open ame,

spark, or pilot light, such as on a water heater or other appliance.

•A void asphyxiation…

Do not operate the machine in a conned area without proper ventilation.

•A void injury from lead acid batteries…

– Battery acid is poisonous and can cause burns. A void contact with skin,

eyes and clothing.

– Battery gases can explode. Keep cigarettes, sparks and ames away

from the battery .

•A void injury from lithium-ion batteries…

– Immediately discontinue use of the battery if the battery emits an unusual

smell, feels hot, changes color or shape, or appears abnormal in any

other way . Move the product or battery to a safe outdoor area away from

any building, vehicle, or combustible material. Observe the battery for

at least 1 hour to ensure that any reaction has stopped. If the reaction

continues, or if any smoke is observed, call your local emergency services

immediately .

– Use only T oro-specied lithium-ion battery packs designed for your

machine. Do not mix batteries of any brand or type in T oro products.

– Use only the T oro-specied lithium-ion charger designed to charge your

machine. Do not attempt to use any other battery charger .

– Do not over-charge or over-discharge lithium-ion batteries.

– Do not expose a battery pack or machine to re or excessive

temperatures. Exposure to re temperature above 130° C may cause

an explosion.

– Do not puncture or open the battery case.

2000 Series Z MASTER®Service Manual Page 1–3

Safety: Safety Instructions

3460-328 Rev A

Think Safety First (continued)

– Always disconnect the batteries at the battery disconnect provided when

servicing products with lithium-ion batteries.

– Always change out the batteries while servicing the machine with the

lithium-ion batteries machine parked near a service door large enough to

move the product or battery outside in case of an emergency and keep a

re blanket nearby . Do not use a re extinguisher on lithium-ion batteries.

•A void injury due to inferior parts…

Use only original equipment parts to ensure that important safety criteria

are met.

•A void injury to bystanders…

Always clear the area of bystanders before starting or testing powered

equipment.

•A void injury due to projectiles…

Always clear the area of any debris that could be picked up and thrown

by the powered equipment.

•A void modications…

Do not alter or modify any part unless it is a manufacturer ’ s approved

procedure.

•A void unsafe machine operation…

Always test the safety interlock system after adjusting or repairing the

machine. Refer to the machine’ s operator ’ s manual for more information.

•A void electrical shock…

– De-energize the system if you are having to do repairs. Refer to the

machine’ s operator ’ s manual for more information.

– If testing electrical components, ensure you are working in a dry

environment.

– Do not touch exposed terminals.

– Do not wear metal jewelry when working on or near electrical components

or wiring.

– Use only insulated tools whenever servicing electrical components or

wiring.

•Hydraulic System...

– Seek immediate medical attention if uid is injected into the skin.

– Injected uid must be surgically removed within a few hours by a doctor .

– Always bleed pressure from the hydraulic system prior to service.

– Use cardboard or paper to nd hydraulic leaks.

•Use personal protective equipment…

– T ie back long hair , and do not wear loose clothing or jewelry .

– Use appropriate personal protective equipment (PPE) for protecting

yourself from potential hazards in the environment in which you will work.

– Each process outlined in this manual may need dif ferent PPE to protect

the person performing service. Use the proper PPE for the task at hand.

•Using tools…

– All tools should be in proper working order . Do not use tools that are

broken or in disrepair .

– Use the proper tool for the proper application.

•Using lifts, hoists, and jacks…

Safety: Safety Instructions

Page 1–4 2000 Series Z MASTER®Service Manual

3460-328 Rev A

Think Safety First (continued)

– All lifts, hoists, and jacks should be used in accordance with the

manufacturer information.

– Inspect lifts, hoists, and jacks prior to use.

– Do not overload lifts, hoists, and jacks.

– Do not work under a suspended load.

– Ensure chock blocks are used on equipment that can move.

– Use lifts or jacks and jack stands that are rated to support the total weight

of the machine and any attachments.

– Do not rely on jacks to support the machine.

– If you are unfamiliar with any lifts, hoists or jacks, do not use them until

you know how to operate them correctly .

•Using re extinguishers…

Use the proper class of re extinguisher in case of re.

Ensure re extinguishers are serviced regularly , and replace any re

extinguishers that are discharged or in use beyond their expiration dates.

W ARNING

Do not use a re extinguisher on lithium-ion batteries. If you

observe any smoke, move the product or battery to a safe outdoor

area away from any building, vehicle, or combustible material if

possible and call your local emergency services immediately .

Failure to do so may result in personal injury and property

damage.

–Class A re extinguishers are for ordinary combustible materials such

as paper , wood, cardboard, and most plastics. The numerical rating on

these types of extinguishers indicates the amount of water it holds and

the amount of re it can extinguish. Geometric symbol (green triangle).

–

–Class B re extinguishers are for res that involve ammable or

combustible liquids such as gasoline, kerosene, grease and oil. The

numerical rating for class B extinguishers indicates the approximate

number of square feet of re it can extinguish. Geometric symbol (red

square).

–Class C re extinguishers are for res that involve electrical equipment

such as appliances, wiring, circuit breakers and outlets. Never use water

to extinguish class C res - the risk of electrical shock is far too great!

Class C extinguishers do not have a numerical rating. The C classication

means the extinguishing agent is non-conductive. Geometric symbol

(blue circle).

–ABC re extinguishers are a dry chemical type used for multiple purposes.

See above descriptions for additional information.

2000 Series Z MASTER®Service Manual Page 1–5

Safety: Safety Instructions

3460-328 Rev A

Safety: Safety Instructions

Page 1–6 2000 Series Z MASTER®Service Manual

3460-328 Rev A

Chapter 2

Specications and Maintenance

T able of Contents

Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2– 2

T orque Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2– 4

Equivalents and Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2– 9

U.S. to Metric Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2– 10

2000 Series Z MASTER®Service Manual Page 2–1 Specications and Maintenance

3460-328 Rev A

Specications

Engine

Model 77281 77283 77285 77291 77294 77288 77281T A 77291T A 77294T A

Hp 24.5 Hp 23.5 Hp 28 Hp 24.5 Hp 23.5 Hp

Engine

T oro Kawasaki

Briggs &

Stratton

T oro Kawasaki

Engine

Model

LC2P77F

FX730V V anguard 810

LC2P77F

FX730V

Engine T ype

Carbureted 4–cycle

Fuel injected

4-cycle

Carbureted 4–cycle

High Idle

3600 ± 100 RPM 3800 ± 100 RPM

3600 ±

100 RPM

3800 ± 100 RPM

Low Idle

1800 ± 150 RPM 1550 ± 150 RPM

1750 ± 100

RPM

1800 ±

150 RPM

1550 ± 150 RPM

Spark Plug

Champion: RN9YC, NGK:

BPR6ES

NGK: BPR4ES

See B&S

Manual

Champion:

RN9YC,

NGK:

BPR6ES

NGK: BPR4ES

Engine Oil

See Operator ’ s Manual

See Kawasaki

Manual

See B&S

Manual

See

Operator ’ s

Manual

See Kawasaki

Manual

Oil Capacity

2.4 L (2.5 US qt) w/ Filter

2.1 L (2.2 US qt)

w/ Filter

1.9 L (2.0 US

qt) w/ Filter

2.4 L (2.5

US qt) w/

Filter

2.1 L (2.2 US qt)

w/ Filter

Fuel

Capacity

26.5 L (7 gallons)

Battery

12V - 300 CCA

Hydraulic Drive System

T ransmission ZT -3400

T ransmission

Lubricant

1.9 L (2 US qt) T oro HYPR-OIL 500 Hydraulic Fluid or Mobil 1 20W -50

Max Ground

Speed

Up to 16.1 km/h (10 mph)

Rear T ires

61 x 24.1

- 30.5 cm

(24 x 9.5

- 12 inch)

61 x 26.7

- 30.5

cm (24

x 10.5 -

12 inch)

61 x 30.5

- 30.5

cm (24

x 12 - 12

inch)

61 x 26.7

- 30.5

cm (24 x

10.5 - 12

inch)

61 x 30.5 - 30.5 cm (24

x 12 - 12 inch)

61 x 24.1

- 30.5 cm

(24 x 9.5

- 12 inch)

61 x

26.7 -

30.5 cm

(24 x

10.5 - 12

inch)

61 x

30.5 -

30.5 cm

(24 x

12 - 12

inch)

Rear T ire

Pressure

0.9 bar (13 psi)

Front Caster

T ires

33 x 16.5 - 15.2 cm (13 x 6.5 - 6 inch)

Front T ire

Pressure

Pneumatic, 0.9 bar (13 psi) Semi-Pneumatic Pneumatic, 0.9 bar (13 psi)

Mower Deck

Deck W idth

121.9 cm

(48 inch)

132.1

cm (52

inch)

152.4

cm (60

inch)

132.1 cm

(52 inch)

152.4 cm (60 inch)

121.9 cm

(48 inch)

132.1

cm (52

inch)

152.4

cm (60

inch)

Deck

Conguration

Side Discharge

Deck

Spindles

203.2 mm (8 inch) AL Ball Bearing, 25.4 mm (1 inch) Shaft

Specications and Maintenance: Specications Page 2–2 2000 Series Z MASTER®Service Manual

3460-328 Rev A

Blade T ip

Speed

18,500+ ft/min

Cutting

Height

38.1 - 127 mm (1.5 - 5.0 inch)

2000 Series Z MASTER®Service Manual Page 2–3 Specications and Maintenance: Specications

3460-328 Rev A

T orque Specications

The recommended fastener torque values are listed in the following tables. For

critical applications, as determined by T oro, either the recommended torque or a

torque that is unique to the application is clearly identied and specied in the

service manual.

These torque specications for the installation and tightening of fasteners shall

apply for all fasteners which do not have a specic requirement identied in

the service manual. The following factors shall be considered when applying

torque: cleanliness of the fastener , use of a thread sealant (Loctite), degree of

lubrication on the fastener , presence of a prevailing torque feature, hardness

of the surface underneath of the fastener ’ s head, or similar condition which

af fects the installation.

As noted in the following tables, torque values should be reduced by 25% for

lubricated fasteners to achieve the similar stress as a dry fastener . T orque values

may also have to be reduced when the fastener is threaded into aluminum or

brass. The specic torque value should be determined based on the aluminum

or brass material strength, fastener size, length of thread engagement, etc.

The standard method of verifying torque shall be performed by marking a line on

the fastener (head or nut) and mating part, then back of f fastener 1/4 of a turn.

Measure the torque required to tighten the fastener until the lines match up.

Fastener Identication

Inch Series Bolts and Screws

g272208

Figure 1

1. Grade 1 3. Grade 8

2. Grade 5

Specications and Maintenance: T orque Specications Page 2–4 2000 Series Z MASTER®Service Manual

3460-328 Rev A

Metric Bolts and Screws

g272209

Figure 2

1. Class 8.8 2. Class 10.9

2000 Series Z MASTER®Service Manual Page 2–5 Specications and Maintenance: T orque Specications

3460-328 Rev A

Standard T orque for Dry , Zinc Plated, and Steel Fasteners (Inch Series)

Thread Size Grade 1,

5, & 8

Fasteners

with Thin

Height Nuts

SAE Grade 1 Bolts, Screws,

Studes & Sems with

Regular Height Nuts (SAE

Grade 2 or Better Nut)

SAE Grade 5 Bolts, Screws,

Studs & Sems with Regular

Height Nuts (SAE Grade

5 or Better Nut)

SAE Grade 8 Bolts, Screws,

Studs & Sems with Regular

Height Nuts (SAE Grade

8 or Better Nut)

in-lb in-lb N • cm in-lb N • cm in-lb N • cm

#6-32 UNC

15 ± 2 169 ± 23 23 ± 3 260 ± 34

#6-40 UNF

10 ± 2 13 ± 2 147 ± 23

17 ± 2 192 ± 23 25 ± 3 282 ± 34

#8-32 UNC

29 ± 3 328 ± 34 41 ± 5 463 ± 56

#8-36 UNF

13 ± 2 25 ± 5 282 ± 30

31 ± 4 350 ± 45 43 ± 5 486 ± 56

#10-24 UNC

42 ± 5 475 ± 56 60 ± 6 678 ± 68

#10-32 UNF

18 ± 2 30 ± 5 339 ± 56

48 ± 5 542 ± 56 68 ± 7 768 ± 79

1/4-20 UNC

48 ± 7 53 ± 7 599 ± 79 100 ± 10 1 130 ± 1 13 140 ± 15 1582 ± 169

1/4-28 UNF

53 ± 7 65 ± 10 734 ± 1 13 1 15 ± 12 1299 ± 136 160 ± 17 1808 ± 192

5/16-18 UNC

1 15 ± 15 105 ± 15 1 186 ± 169 200 ± 25 2260 ± 282 300 ± 30 3390 ± 339

5/16-24 UNF

138 ± 17 128 ± 17 1446 ± 192 225 ± 25 2542 ± 282 325 ± 33 3672 ± 373

ft-lb ft-lb

N • m

ft-lb

N • m

ft-lb

N • m

3/8-16 UNC

16 ± 2 16 ± 2 22 ± 3 30 ± 3 41 ± 4 43 ± 5 58 ± 7

3/8-24 UNF

17 ± 2 18 ± 2 24 ± 3 35 ± 4 47 ± 5 50 ± 6 68 ± 8

7/16-14 UNC

27 ± 3 27 ± 3 37 ± 4 50 ± 5 68 ± 7 70 ± 7 95 ± 9

7/16-20 UNF

29 ± 3 29 ± 3 39 ± 4 55 ± 6 75 ± 8 77 ± 8 104 ± 1 1

1/2-13 UNC

30 ± 3 48 ± 7 65 ± 9 75 ± 8 102 ± 1 1 105 ± 1 1 142 ± 15

1/2-20 UNF

32 ± 4 53 ± 7 72 ± 9 85 ± 9 1 15 ± 12 120 ± 12 163 ± 16

5/8-1 1 UNC

65 ± 10 88 ± 12 1 19 ± 16 150 ± 15 203 ± 20 210 ± 21 285 ± 28

5/8-18 UNF

75 ± 10 95 ± 15 129 ± 20 170 ± 18 230 ± 24 240 ± 24 325 ± 33

3/4-10 UNC

93 ± 12 140 ± 20 190 ± 27 265 ± 27 359 ± 37 375 ± 38 508 ± 52

3/4-16 UNF

1 15 ± 15 165 ± 25 224 ± 34 300 ± 30 407 ± 41 420 ± 43 569 ± 58

7/8-9 UNC

140 ± 20 225 ± 25 305 ± 34 430 ± 45 583 ± 61 600 ± 60 813 ± 81

7/8-14 UNF

155 ± 25 260 ± 30 353 ± 41 475 ± 48 644 ± 65 667 ± 66 904 ± 89

Note: Reduce torque values listed in the table above by 25% for lubricated fasteners. Lubricated

fasteners are dened as threads coated with a lubricant such as oil, graphite, or thread sealant such

as Loctite.

T orque values may have to be reduced when installing fasteners into threaded aluminum or brass. The

specic torque value should be determined based on the fastener size, the aluminum or base material

strength, length of thread engagement, etc.

The nominal torque values listed above for Grade 5 and 8 fasteners are based on 75% of the minimum

proof load specied in SAE J429. The tolerance is approximately ± 10% of the nominal torque value.

Thin nuts include jam nuts.

Specications and Maintenance: T orque Specications Page 2–6 2000 Series Z MASTER®Service Manual

3460-328 Rev A

Standard T orque for Dry , Zinc Plated, and Steel Fasteners (Metric Series)

Class 8.8 Bolts, Screws, Studs with Regular

Height Nuts (Class 8 or Stronger Nuts)

Class 10.9 Bolts, Screws, Studs with Regular

Height Nuts (Class 10 or stronger Nuts)

Thread Size

in-lb N • cm in-lb N • cm

M5 X 0.8 57 ± 6 644 ± 68 78 ± 8 881 ± 90

M6 X 1.0 96 ± 10 1085 ± 1 13 133 ± 14 1503 ± 158

ft-lb

N • m

ft-lb

N • m

M8 X 1.25 19 ± 2 26 ± 3 28 ± 3 38 ± 4

M10 X 1.5 38 ± 4 52 ± 5 54 ± 6 73 ± 8

M12 X 1.75 66 ± 7 90 ± 10 93 ± 10 126 ± 14

M16 X 2.0 166 ± 17 255 ± 23 229 ± 23 310 ± 31

M20 X 2.5 325 ± 33 440 ± 45 450 ± 46 610 ± 62

Note: Reduce torque values listed in the table above by 25% for lubricated fasteners. Lubricated

fasteners are dened as threads coated with a lubricant such as oil, graphite, or thread sealant such

as Loctite.

T orque values may have to be reduced when installing fasteners into threaded aluminum or brass. The

specic torque value should be determined based on the fastener size, the aluminum or base material

strength, length of thread engagement, etc.

The nominal torque values listed above are based on 75% of the minimum proof load specied in SAE

J1 199. The tolerance is approximately ± 10% of the nominal torque value. Thin height nuts include jam

nuts.

2000 Series Z MASTER®Service Manual Page 2–7 Specications and Maintenance: T orque Specications

3460-328 Rev A

SAE Grade 8 Steel Set Screws

Recommended T orqueThread Size

Square Head Hex Socket

1/4 - 20 UNC

140 ± 20 in-lb 73 ± 12 in-lb

5/16 - 18 UNC

215 ± 35 in-lb 145 ± 20 in-lb

1/2 - 13 UNC 75 ± 15 ft-lb 50 ± 10 ft-lb

3/8 - 16 UNC 35 ± 10 ft-lb 18 ± 3 ft-lb

Wheel Bolts and Lug Nuts

Thread Size Recommended T orque**

7/16 - 20 UNF Grade 5 65 ± 10 ft-lb

88 ± 14 N • m

1/2 - 20 UNF Grade 5 80 ± 10 ft-lb

108 ± 14 N • m

M12 X 1.25 Class 8.8 80 ± 10 ft-lb

108 ± 14 N • m

M12 X 1.5 Class 8.8 80 ± 10 ft-lb

108 ± 14 N • m

**For steel wheels and non-lubricated fasteners.

Thread Cutting Screws (Zinc Plated Steel)

T ype 1, T ype 23, or T ype F

Thread Size Baseline T orque*

No. 6 - 32 UNC

20 ± 5 in-lb

No. 8 - 32 UNC

30 ± 5 in-lb

No. 10 - 24 UNC

38 ± 7 in-lb

1/4 - 20 UNC

85 ± 15 in-lb

5/16 - 18 UNC

1 10 ± 20 in-lb

3/8 - 16 UNC

200 ± 100 in-lb

*Hole size, material strength, material thickness and nish must be considered when determining

specic torque values. All torque values are based on non-lubricated fasteners.

Conversion Factors

in-lb X 1 1.2985 = N • cm

ft-lb X 1.3558 = N • m

N • cm X 0.08851 = in-lb

N • cm X 0.73776 = ft-lb

Thread Cutting Screws (Zinc Plated Steel)

Threads per InchThreads Size

T ype A T ype B

Baseline T orque*

No. 6 18 20 20 ± 5 in-lb

No. 8 15 18 30 ± 5 in-lb

No. 10 12 16 38 ± 7 in-lb

No. 12 1 1 14 85 ± 15 in-lb

*Hole size, material strength, material thickness and nish must be considered when determining

specic torque values. All torque values are based on non-lubricated fasteners.

Specications and Maintenance: T orque Specications Page 2–8 2000 Series Z MASTER®Service Manual

3460-328 Rev A

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Toro 52in Z Master Professional 2000 Series Riding Mower User manual

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