Toro 74637 User Manual (English)

Questions and Answers:

K
kimberlyfosterJul 31, 2025
Why does my Toro 74637 Lawn Mower engine not start?
- K
  Katherine MaxwellJul 31, 2025
  Your Toro Lawn Mower engine may not start due to several reasons: the fuel tank might be empty, so fill it. The choke may not be on, so move the choke lever to the On position. The air cleaner could be dirty, so clean or replace the air-cleaner element. The spark plug wire(s) might be loose or disconnected, so install the wire(s) on the spark plug. The spark plug(s) could be pitted, fouled, or have an incorrect gap, so install a new, correctly gapped spark plug(s). There might be dirt in the fuel filter, so replace it. There could be incorrect fuel in the fuel tank, so drain the tank and replace the fuel with the proper type. Also, the oil level in the crankcase might be low, so add oil to the crankcase.
M
Michelle MartinAug 4, 2025
Why is my Toro Lawn Mower engine losing power?
- J
  Joanne CooperAug 4, 2025
  Your Toro Lawn Mower engine may be losing power for a few reasons. The engine load might be excessive, so reduce the ground speed. The air cleaner could be dirty, so clean it. The oil level in the crankcase might be low, so add oil to the crankcase. The cooling fins and air passages under the engine blower housing could be plugged, so remove any obstructions. The spark plug(s) might be pitted, fouled, or have an incorrect gap, so install a new, correctly gapped spark plug(s). There might be dirt in the fuel filter, so replace the fuel filter. There could be incorrect fuel in the fuel tank, so drain the tank and replace the fuel with the proper type.
J
Jenny SimmonsAug 10, 2025
How to fix uneven cutting height on my Toro 74637 Lawn Mower?
- A
  Anthony GriffinAug 10, 2025
  Uneven cutting height on your Toro Lawn Mower can be caused by several factors: - The blade(s) might not be sharp, so sharpen them. - A cutting blade(s) might be bent, so install a new one. - The mower might not be level, so level it from side-to-side and front-to-rear. - An anti-scalp wheel might not be set correctly, so adjust its height. - The underside of the mower might be dirty, so clean it. - The tire pressure might be incorrect, so adjust it.
C
Chelsea MillerAug 15, 2025
What to do if my Toro 74637 engine overheats?
- M
  monica77Aug 15, 2025
  If your Toro Lawn Mower engine is overheating, it could be due to several factors. The engine load might be excessive, so reduce the ground speed. The oil level in the crankcase might be low, so add oil. The cooling fins and air passages under the engine blower housing could be plugged, so remove the obstruction. The air cleaner might be dirty, so clean or replace it.
B
Benjamin GonzalesAug 20, 2025
Why does my Toro 74637 Lawn Mower have an abnormal vibration?
- L
  lovenicoleAug 20, 2025
  An abnormal vibration in your Toro Lawn Mower could stem from several issues. The engine-mounting bolts might be loose, so tighten them. The engine pulley, idler pulley, or blade pulley could be loose, so tighten the appropriate pulley. The cutting blade(s) might be bent or unbalanced, so install a new cutting blade(s). A blade mounting bolt might be loose, so tighten it.
R
Robert KellyAug 25, 2025
What to do if my Toro 74637 Lawn Mower blades do not rotate?
- E
  Emily LyonsAug 26, 2025
  If the blades on your Toro Lawn Mower aren't rotating, it could be because the drive belt is worn, loose, or broken, so install a new one. Also, the drive belt might be off of the pulley, so install the drive belt and check the adjusting shafts and belt guides for the correct position, or the mower belt is worn, loose, or broken, so install a new mower belt.

Toro 74637 Specifications

General

Brand	Toro
Model	74637
Category	Lawn Mower
Language	English

Summary

Introduction

Safety Alerts and Warnings

Manual highlights potential hazards using safety alert symbols and warnings for user safety.

Model and Serial Number Identification

Locate and record the product's model and serial numbers for reference and service.

Safety

Safe Operating Practices and General Operation

Covers safe operating practices, general operation rules, and specific safety advice for various scenarios.

Slope Operation Safety Precautions

Precautions for mowing on slopes, including speed, terrain, and avoiding tip-overs.

Children Safety

Guidelines to prevent injury to children by keeping them away from the mower during operation and storage.

Towing Safety Guidelines

Recommendations for safely attaching and using towed equipment, considering stability and control.

Safe Gasoline Handling

Precautions for handling gasoline to prevent fire, explosion, and personal injury, including fueling and storage.

General Maintenance and Safety Practices

General service advice, including keeping the machine clean, checking fasteners, and ensuring safety devices function.

Safety Decal Identification

Details and explanations of various safety and instructional decals present on the machine.

Control Identification and Symbols

Identification of various controls (gear shift, bypass levers, height-of-cut) and battery safety symbols.

Hazard Symbols and Operational Warnings

Visual representation of hazards and operational warnings, including blade safety, entanglement, and tipping.

Product Overview

Controls

Ignition Switch Operation

Explains the function and positions of the ignition switch for starting, running, and stopping the engine.

Throttle Control

Description of the throttle control for adjusting engine speed, including its variable setting.

Choke Control Operation

Instructions on how to operate the choke control for starting a cold engine.

Blade Control Switch (PTO)

Explains the function of the blade-control switch for engaging and disengaging the mower blades.

Motion-Control Levers and Park Position

Details on how motion-control levers operate the drive wheels and the importance of the park position.

Operation

Adding Fuel Safely

Instructions for adding fuel, including fuel type recommendations, avoiding contamination, and safety warnings.

Fuel-Presence Window

Description of the fuel window used to verify the gasoline level in the tank.

Height-of-Cut Lever Adjustment

How to use the height-of-cut lever to raise or lower the mower deck for desired grass length.

Fueling Safety and Procedures

Detailed safety precautions for fueling, including static electricity, avoiding spills, and proper filling techniques.

Fuel Stabilizer and Conditioner Usage

Guidance on using fuel stabilizers to keep gasoline fresh and clean the fuel system, with important usage notes.

Engine Oil and Break-in Procedures

Checking the Engine Oil Level

Procedure for checking the engine oil level before operating the machine for safety and performance.

New Machine Break-in Period

Information on the recommended break-in period for new engines and drive systems to ensure optimal performance.

Operating Safety

General Operating Hazards

Critical safety warnings about mowing on slopes, wet grass, and near edges to prevent accidents.

Noise and Protective Gear

Advisory on machine noise levels and the importance of wearing protective gear like safety glasses and hearing protection.

Safety-Interlock System Verification

Starting the Engine

Blade Operation: Engaging and Disengaging

System Testing and Engine Control

Safety-Interlock System Testing

Procedure to test the safety-interlock system before each use to ensure proper functionality.

Stopping the Engine

Steps for safely shutting down the engine, including disengaging blades and turning off the ignition.

Driving the Mower

Smart Speed™ Control System Operation

Driving Forward

Driving Backward and Stopping the Machine

Deck Height and Roller Adjustment

Adjusting the Height-of-Cut Lever

How to use the height-of-cut lever to raise or lower the mower deck for desired grass length.

Adjusting the Anti-scalp Rollers

Guidance on adjusting anti-scalp rollers to prevent deck damage on uneven terrain.

Operator Seating and Control Adjustment

Positioning the Operator Seat

Guidance on adjusting the seat forward or backward for optimal control and comfort.

Motion-Control Lever Adjustment

Instructions for adjusting the height and tilt of motion-control levers for operator comfort.

Pushing the Machine Manually

Manual Pushing and Basic Operation

Manually Pushing the Mower

Steps to engage bypass levers for manual pushing and releasing the electric brake.

Operating the Machine (Post-Pushing)

Instructions for operating the machine after it has been manually pushed, involving bypass lever settings.

Operating Tips for Mowing

Mowing Techniques and Strategies

Advice on throttle use, Smart Speed™, cutting height, direction, intervals, and handling long grass.

Blade Maintenance and Mower Cleaning

Guidance on keeping the mower underside clean and maintaining sharp, undamaged blades for optimal cutting.

Maintenance Overview and Schedule

Recommended Maintenance Schedule

A schedule outlining maintenance tasks and intervals for daily, hourly, and periodic servicing.

Pre-Maintenance Safety Precautions

Essential safety steps before performing maintenance, including removing the ignition key and spark plug wire.

Premaintenance Procedures and Lubrication

Accessing Components by Raising Seat

Steps to raise the seat to access components like the serial plate, fuel filter, and battery cables.

Greasing Wheel Bearings

Procedure for greasing lubrication points, specifically wheel bearings, every 25 hours of operation.

Engine Maintenance: Air Cleaner Service

Engine Maintenance: Engine Oil Service

Engine Oil Specifications

Details on recommended oil type, crankcase capacity, and viscosity grades for engine lubrication.

Checking the Engine Oil Level

Procedure for checking the engine oil level before operating the machine for safety and performance.

Changing Engine Oil and Filter

Spark Plug Service and Checks

Spark Plug and Fuel System Maintenance

Cleaning the Blower Housing

Procedure for cleaning the blower housing and cooling fins to ensure proper engine cooling.

Replacing the In-line Fuel Filter

Steps for replacing the in-line fuel filter to ensure proper fuel flow to the engine.

Electrical System Maintenance

Battery Removal Precautions

Safety warnings and procedures for safely disconnecting and removing the battery from the machine.

Charging and Installing the Battery

Fuse Servicing and Tire Pressure

Servicing Fuses for Electrical Protection

Information on fuse types and procedures for checking and replacing blown fuses in the electrical system.

Checking Tire Pressure

Procedure for checking and maintaining proper tire pressure for even cutting and safe operation.

Brake Release and Blade Inspection

Releasing the Electric Brake

Instructions on manually releasing the electric brake by rotating the brake-link arms forward.

Inspecting Cutting Blades

Procedure for inspecting mower blades for sharpness, wear, damage, and potential defects.

Checking for Bent Blades

Blade Servicing

Sharpening Mower Blades

Guidance on sharpening mower blades, maintaining original angles, and checking for balance.

Removing and Installing Mower Blades

Steps for safely removing and installing mower blades, ensuring proper orientation and torque.

Mower Deck Leveling

Side-to-Side Deck Leveling

Instructions for adjusting the mower deck for side-to-side levelness, including bolt adjustments.

Front-to-Rear Deck Leveling

Front-to-Rear Slope Adjustment

Removing the Mower Deck

Mower Installation and Grass Deflector

Installing the Mower Deck

Procedure for attaching the mower deck to the tractor, including lift rod and support rod connections.

Replacing the Grass Deflector

Instructions for replacing a damaged or worn grass deflector to prevent thrown objects.

Mower Belt Maintenance

Inspecting Mower Belts

Checks for wear, cracks, or damage on mower belts to ensure proper function and prevent failure.

Replacing the Mower Belt

Procedure for replacing a worn mower belt, including tension release and pulley routing.

Mower Belt Replacement Procedure

Cleaning the Mower: Underside Washing

Storage Preparation and Cleaning

Troubleshooting Engine Problems

Troubleshooting Drive and Machine Issues

Troubleshooting Vibration and Cutting Height

Diagnoses causes and solutions for abnormal vibration, uneven cutting height, and blades not rotating.

Schematics

Electrical System Schematics

Provides the electrical diagram for the machine, illustrating wiring connections and component layout.

Toro Total Coverage Warranty Information

Products Covered and Warranty Periods

Details the Toro products covered by the warranty and their respective warranty periods.

Obtaining Warranty Service

Procedure for contacting dealers and obtaining warranty service for defective Toro products.

Items and Conditions Not Covered

Lists conditions, parts, and situations that are excluded from warranty coverage.

Related product manuals

Toro 74637 User Manual

Table of Contents

Questions and Answers:

Toro 74637 Specifications

Summary

Introduction

Safety Alerts and Warnings

Model and Serial Number Identification

Safety

Safe Operating Practices and General Operation

Slope Operation Safety Precautions

Children Safety

Towing Safety Guidelines

Safe Gasoline Handling

General Maintenance and Safety Practices

Safety Decal Identification

Control Identification and Symbols

Hazard Symbols and Operational Warnings

Product Overview

Controls

Ignition Switch Operation

Throttle Control

Choke Control Operation

Blade Control Switch (PTO)

Motion-Control Levers and Park Position

Operation

Adding Fuel Safely

Fuel-Presence Window

Height-of-Cut Lever Adjustment

Fueling Safety and Procedures

Fuel Stabilizer and Conditioner Usage

Engine Oil and Break-in Procedures

Checking the Engine Oil Level

New Machine Break-in Period

Operating Safety

General Operating Hazards

Noise and Protective Gear

Safety-Interlock System Verification

Starting the Engine

Blade Operation: Engaging and Disengaging

System Testing and Engine Control

Safety-Interlock System Testing

Stopping the Engine

Driving the Mower

Smart Speed™ Control System Operation

Driving Forward

Driving Backward and Stopping the Machine

Deck Height and Roller Adjustment

Adjusting the Height-of-Cut Lever

Adjusting the Anti-scalp Rollers

Operator Seating and Control Adjustment

Positioning the Operator Seat

Motion-Control Lever Adjustment

Pushing the Machine Manually

Manual Pushing and Basic Operation

Manually Pushing the Mower

Operating the Machine (Post-Pushing)

Operating Tips for Mowing

Mowing Techniques and Strategies

Blade Maintenance and Mower Cleaning

Maintenance Overview and Schedule

Recommended Maintenance Schedule

Pre-Maintenance Safety Precautions

Premaintenance Procedures and Lubrication

Accessing Components by Raising Seat

Greasing Wheel Bearings

Engine Maintenance: Air Cleaner Service

Engine Maintenance: Engine Oil Service

Engine Oil Specifications

Checking the Engine Oil Level

Changing Engine Oil and Filter

Spark Plug Service and Checks

Spark Plug and Fuel System Maintenance

Cleaning the Blower Housing

Replacing the In-line Fuel Filter

Electrical System Maintenance

Battery Removal Precautions

Charging and Installing the Battery

Fuse Servicing and Tire Pressure

Servicing Fuses for Electrical Protection