Toro 74721 User Manual

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FormNo.3408-588RevB

TimeCutter

®

SS4225or5000

RidingMower

ModelNo.74721—SerialNo.400000000andUp

ModelNo.74732—SerialNo.400000000andUp

Registeratwww.Toro.com.

OriginalInstructions(EN)

*3408-588*B

Table of Contents

Questions and Answers:

J
Jacob GriffithAug 12, 2025
Why does my Toro 74721 Lawn Mower engine not start, start hard, or fail to keep running?
- J
  Jesus GatesAug 13, 2025
  Several factors can cause this issue. The fuel tank might be empty, so refill it. The air cleaner could be dirty, requiring cleaning or replacement. Check if the spark plug wire(s) is loose or disconnected and install the wire(s) on the spark plug. A spark plug(s) may be pitted, fouled, or have an incorrect gap, so install a new, correctly gapped spark plug(s). The fuel filter may be dirty, so replace it. The oil level in the crankcase might be low, so add oil to the crankcase. Finally, ensure that you are using the correct fuel type; if not, drain the tank and replace the fuel with the proper type.
C
christopher57Aug 16, 2025
What to do if the blades do not rotate on my Toro 74721?
- E
  Edward CarpenterAug 17, 2025
  If the blades on your Toro Lawn Mower aren't rotating, it could be due to a worn, loose, or broken drive belt, so install a new drive belt. Alternatively, the drive belt might be off the pulley, so install the drive belt and check the adjusting shafts and belt guides for the correct position. Also, the mower belt could be worn, loose, or broken, so install a new mower belt.
S
Sean MartinAug 20, 2025
What to do if my Toro 74721 Lawn Mower engine overheats?
- E
  Erin AndrewsAug 20, 2025
  If your Toro Lawn Mower engine is overheating, several factors could be the cause. First, the engine load might be excessive, so reduce the ground speed. Second, the oil level in the crankcase might be low, so add oil to the crankcase. Third, check the cooling fins and air passages under the engine blower housing for obstructions and remove them. Fourth, a dirty air cleaner can cause overheating, so clean or replace the air-cleaner element.
T
Tyler SavageAug 25, 2025
Why is my Toro 74721 Lawn Mower engine losing power?
- L
  Luis DuncanAug 25, 2025
  A loss of power in your Toro Lawn Mower engine can stem from several causes: excessive engine load, which can be resolved by reducing ground speed; a dirty air cleaner, which requires cleaning; or a low oil level in the crankcase, necessitating the addition of oil. Furthermore, check for obstructions in the cooling fins and air passages under the engine blower housing and remove them if present. Ensure the spark plug(s) is in good condition; if pitted, fouled, or incorrectly gapped, replace it. Check the fuel filter for dirt and replace if necessary. Finally, if you are using incorrect fuel, drain the tank and replace it with the proper type.
T
Theresa OlsonAug 28, 2025
Why is my Toro 74721 cutting height uneven?
- C
  Cynthia GarciaAug 28, 2025
  An uneven cutting height on your Toro Lawn Mower can be due to several reasons. The blade(s) may not be sharp, so sharpen the blade(s). A cutting blade(s) may be bent, so install a new cutting blade(s). The mower might not be level, so level the mower from side-to-side and front-to-rear. An anti-scalp wheel may not be set correctly, so adjust the anti-scalp wheel height. The underside of the mower could be dirty, so clean it. Finally, the tire pressure might be incorrect, so adjust the tire pressure.
S
spetersonAug 31, 2025
What to do if my Toro Lawn Mower does not drive?
- P
  Penny ReedSep 1, 2025
  If your Toro Lawn Mower isn't driving, check if the bypass valves are open and close the tow valves.
W
wwarrenSep 4, 2025
What to do if my Toro Lawn Mower starter does not crank?
- N
  Nicole GalvanSep 4, 2025
  If the starter on your Toro Lawn Mower isn't cranking, here are a few things to check: Ensure the blade-control switch is disengaged. Make sure the motion-control levers are in the PARK position. Verify the battery isn't dead by charging it. Inspect the electrical connections for corrosion or looseness, and ensure they have good contact. Check for a blown fuse and replace it if necessary.
C
crobinsonSep 8, 2025
What to do if my Toro Lawn Mower has an abnormal vibration?
- R
  Rebecca WebsterSep 8, 2025
  If your Toro Lawn Mower is vibrating excessively, check the following: Tighten any loose engine-mounting bolts. Ensure the engine pulley, idler pulley, or blade pulley is tightened appropriately. If the cutting blade(s) is bent or unbalanced, install a new cutting blade(s). Also, tighten any loose blade-mounting bolts.

Toro 74721 Specifications

General

Transmission	Hydrostatic
Power Source	Gasoline
Starter Type	Electric
Deck Material	Steel
Mulching Capability	Yes
Bagging Capability	Yes
Side Discharge Capability	Yes

Summary

Safety

General Safety

General safety guidelines to avoid serious personal injury while operating the mower.

Safety and Instructional Decals

Product Overview

Operation

Before Operation

Before Operation Safety

Key safety precautions to follow before operating the machine.

Fuel Safety

Important safety rules for handling and storing fuel to prevent hazards.

Recommended Fuel

Filling the Fuel Tank

Checking the Engine-Oil Level

Using the Safety-Interlock System

Understanding the Safety-Interlock System

Testing the Safety-Interlock System

Procedure to test the safety interlock system before each use.

Adjusting the Motion-Control Levers

During Operation Safety

General Safety

General safety guidelines to follow while the machine is in operation.

Slope Safety

Operating the Mower Blade-Control Switch (PTO)

Starting the Engine

Shutting Off the Engine

Using the Motion-Control Levers

Driving the Machine

Using the Smart Speed™ Control System

Stopping the Machine

Adjusting the Height of Cut

Maintaining the Blade(s)

Transporting the Machine

Loading the Machine

Maintenance

Recommended Maintenance Schedule(s)

Schedule outlining maintenance tasks based on service intervals for optimal performance.

Pre-Maintenance Procedures

Maintenance and Storage

Engine Maintenance

Engine Safety

Safety precautions to follow during engine maintenance procedures.

Servicing the Air Cleaner

Instructions for cleaning and replacing the air cleaner element.

Servicing the Engine Oil

Changing the Engine Oil and the Engine-Oil Filter

Servicing the Spark Plug

Removing the Spark Plug

Checking the Spark Plug

How to check the spark plug's condition and set the correct gap.

Installing the Spark Plug

Fuel System Maintenance

Replacing the In-Line Fuel Filter

Procedure for replacing the in-line fuel filter.

Electrical System Maintenance

Electrical System Safety

Safety precautions when working on the machine's electrical system.

Charging the Battery

Removing the Battery

Charging the Battery

Installing the Battery

Drive System Maintenance

Checking the Tire Pressure

Mower Maintenance

Servicing the Cutting Blades

Guidance on sharpening and replacing mower blades for optimal cutting quality.

Blade Safety

Essential safety precautions when working with mower blades to prevent injury.

Before Inspecting or Servicing the Blades

Inspecting the Blades

How to inspect mower blades for wear, damage, or cracks.

Checking for Bent Blades

Removing the Blades

Sharpening the Blades

Installing the Blades

Leveling the Mower Deck

Leveling from Side to Side

Procedure to level the mower deck side-to-side for an even cut.

Adjusting the Front-to-Rear Blade Slope

Removing the Mower Deck

Installing the Mower

Mower Belt Maintenance

Inspecting the Belts

Replacing the Mower Belt

Procedure for replacing the mower drive belt.

Storage

Cleaning and Storage

Procedures for cleaning and preparing the machine for long-term storage.

Troubleshooting

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