Toro 77404 - User Manual

Questions and Answers

C
crobertsAug 17, 2025
What to do if my Toro 77404 cutting height is uneven?
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  Michael Smith IIIAug 17, 2025
  If your Toro Lawn Mower has an uneven cutting height, several factors could be responsible. The blade(s) may not be sharp, so sharpen the blade(s). A cutting blade(s) might be bent, so install a new cutting blade(s). Ensure the mower is level from side-to-side and front-to-rear. If applicable, adjust the anti-scalp wheel height. Clean the underside of the mower deck. Adjust the tire pressure. For a bent blade spindle, contact an Authorized Service Dealer.
M
Marie HamiltonAug 20, 2025
Why don't the blades rotate on my Toro 77404 Lawn Mower?
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  Megan MaxwellAug 21, 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. It could also be that the drive belt is off of the pulley, in this case install the drive belt and check the adjusting shafts and belt guides for the correct position. For a faulty power-takeoff (PTO) switch or PTO clutch, or a worn, loose, or broken mower belt, contact an Authorized Service Dealer.
M
Mark GonzalezAug 25, 2025
Why does my Toro 77404 Lawn Mower engine lose power?
- S
  Stephanie SmithAug 25, 2025
  Your Toro Lawn Mower engine might be losing power due to several reasons. The engine load could be excessive, so try reducing the ground speed. A dirty air cleaner can cause power loss, so clean the air-cleaner element. Low oil level in the crankcase, add oil to the crankcase. Check if the cooling fins and air passages under the engine blower housing are plugged and remove any obstruction. Also, inspect the spark plug(s) for pitting, fouling, or incorrect gap and install a new, correctly gapped spark plug(s). For a blocked fuel-tank vent, dirt, water, or stale fuel in the fuel system, or incorrect fuel in the fuel tank, contact an Authorized Service Dealer.
B
Brandi HerreraAug 28, 2025
What to do if my Toro Lawn Mower engine overheats?
- D
  Dave StantonAug 28, 2025
  If your Toro Lawn Mower engine overheats, there are several possible causes. The engine load may be excessive, so reduce the ground speed. The oil level in the crankcase may be low, so add oil to the crankcase. The cooling fins and air passages under the engine-blower housing may be plugged, so remove the obstruction from the cooling fins and air passages. The air cleaner may be dirty, so clean or replace the air-cleaner element. If the issue is due to dirt, water, or stale fuel in the fuel system, contact an Authorized Service Dealer.
R
Richard BrooksSep 1, 2025
What to do if my Toro Lawn Mower starter does not crank?
- F
  frileySep 1, 2025
  If the starter on your Toro Lawn Mower doesn't crank, check the following: Ensure the blade-control switch is disengaged. Make sure the motion-control levers are in the PARK position. If the battery is dead, charge it. Inspect the electrical connections for good contact. Replace the fuse if it's blown. For a damaged relay or switch, contact an Authorized Service Dealer.
C
Craig MacdonaldSep 5, 2025
What to do if my Toro 77404 machine vibrates abnormally?
- L
  luisdawsonSep 5, 2025
  If your Toro Lawn Mower is vibrating abnormally, check these potential causes: The cutting blade(s) might be bent or unbalanced, so install new cutting blade(s). Ensure the blade mounting bolt is tight. Tighten the engine mounting bolts if they are loose. Also, tighten the engine pulley, idler pulley, or blade pulley if any of them are loose. For a damaged engine pulley, bent blade spindle, or a loose/worn motor mount, contact an Authorized Service Dealer.
Z
Zachary MitchellSep 8, 2025
What to do if my Toro 77404 Lawn Mower machine does not drive?
- C
  Caleb ThompsonSep 9, 2025
  If your Toro Lawn Mower isn't driving, the bypass valves might be open; close the tow valves. For issues related to worn, loose, or broken traction belts, traction belts off the pulleys, or a failed transmission, contact an Authorized Service Dealer.
E
Eric KingNov 12, 2025
Why does my Toro Lawn Mower engine not start, start hard, or fail to keep running?
- M
  Mackenzie VillanuevaNov 12, 2025
  Several factors can cause your Toro Lawn Mower engine to not start, start with difficulty, or fail to keep running. These include an empty fuel tank (fill the fuel tank), the choke not being on (move the choke lever to the ON position), a dirty air cleaner (clean or replace the air-cleaner element), a loose or disconnected spark-plug wire(s) (install the wire(s) on the spark plug), a pitted, fouled, or incorrectly gapped spark plug(s) (install a new, correctly gapped spark plug(s)), dirt in the fuel filter (replace the fuel filter), incorrect fuel in the fuel tank (drain the tank and replace the fuel with the proper type), or a low oil level in the crankcase (add oil to the crankcase). For issues related to dirt, water, or stale fuel in the fuel system, it's best to contact an Authorized S...

Summary

Introduction

Manual Conventions and Safety Symbols

Explains manual terminology and safety alert symbols used throughout.

Safety

General Safety Precautions

Essential safety guidelines for operating the mower to prevent injury.

Slope Operation

Using the Slope Indicator Chart

Guidance on using the slope chart to determine safe operating angles.

Safety Decals and Symbols

Understanding Battery Symbols

Explains various symbols found on the battery for hazard identification.

Product Overview

Key Mower Components Identification

Diagram and labels identifying major parts of the riding mower.

Controls

Control Panel Functions

Details on the key switch, throttle, choke, and blade control.

Specifications

Mower Model Dimensions

Provides cutting width, length, height, and weight for each model.

Attachments and Accessories

Approved Toro Attachments and Accessories

Information on available accessories and the importance of genuine Toro parts.

Fuel Safety and Adding Fuel

Filling the Fuel Tank Safely

Step-by-step guide for safely filling the fuel tank.

Safety-Interlock System

Testing the Safety-Interlock System

Procedure to verify the proper function of safety interlocks.

Seat and Lever Adjustments

Positioning the Operator Seat

How to adjust the seat for optimal control and comfort.

During Operation Safety

General Operator Safety Guidelines

Rules for safe operation, including attention and avoiding distractions.

Slope Safety

Evaluating Site Conditions for Slopes

Guidelines for assessing terrain and operating safely on slopes.

Towing Safety

Safe Towing Procedures and Precautions

Safety advice and considerations for towing equipment with the mower.

Operating the Mower Blade-Control Switch (PTO)

Engaging and Disengaging the PTO

Instructions for starting and stopping the mower blades.

Starting the Engine

Engine Starting Procedure

Step-by-step instructions for safely starting the engine.

Shutting Off the Engine

Safe Engine Shutdown Process

Procedure for turning off the engine and securing the machine.

Driving the Machine

Understanding Motion-Control Levers

How the independent drive wheels and levers control movement.

Smart Speed Control System

Selecting Ground Speed Ranges

Guidance on choosing between Trim, Tow, and Mow speed settings.

Adjusting the Height of Cut

Setting Mower Deck Cutting Height

Instructions for raising and lowering the mower deck.

Operating Tips

Maximizing Air Circulation and Cutting Quality

Tips for best mowing, air circulation, and cutting quality.

Maintaining the Blade(s)

Blade Sharpness and Condition Checks

Ensuring blades are sharp, balanced, and free from damage.

Pushing the Machine by Hand

Engaging Bypass Levers for Manual Push

Steps to disengage the electric brake for manual movement.

Transporting the Machine

Selecting and Using Ramps for Trailers

Guidelines for choosing and safely using ramps for loading.

Maintenance

Recommended Maintenance Schedule

Overview of service intervals and required maintenance tasks.

Engine Maintenance

Servicing the Air Cleaner Element

Instructions for cleaning and replacing air cleaner elements.

Servicing the Engine Oil

Checking Engine Oil Level

Procedure for checking the engine oil level before operation.

Changing the Engine Oil and Oil Filter

Procedure for Engine Oil and Filter Replacement

Step-by-step guide for draining oil and replacing the oil filter.

Servicing the Spark Plug

Checking and Setting Spark Plug Gap

Instructions for checking, gapping, and replacing spark plugs.

Fuel System Maintenance

Replacing the In-Line Fuel Filter

Guidance on replacing the fuel filter annually.

Electrical System Maintenance

Servicing the Mower Battery

Procedures for removing, charging, and installing the battery.

Drive System Maintenance

Checking Tire Pressure

Importance and procedure for maintaining correct tire pressure.

Belt Maintenance

Replacing the Mower Belt

Step-by-step instructions for replacing the mower drive belt.

Mower Maintenance

Servicing the Cutting Blades

Guidance on sharpening, checking for damage, and replacing blades.

Deck Leveling

Checking Side-to-Side Deck Level

Procedure to check and adjust the mower deck's side-to-side balance.

Adjusting the Front-to-Rear Blade Slope

Procedure to Adjust Front-to-Rear Blade Slope

How to adjust the nut to set the correct front-to-rear blade slope.

Removing the Mower Deck

Steps for Mower Deck Removal

Detailed steps for safely detaching the mower deck from the machine.

Installing the Mower Deck

Steps for Mower Deck Installation

Detailed steps for safely attaching the mower deck to the machine.

Cleaning

Washing the Underside of the Mower Deck

Instructions for cleaning the mower deck underside using a washout fitting.

Storage

Cleaning and Preparing for Storage

Steps for cleaning, servicing, and preparing the machine for storage.

Storing the Battery

Proper Battery Charging and Storage

How to charge and store the battery for longevity.

Troubleshooting

Engine Not Starting or Running Issues

Diagnosing and correcting problems with engine starting and running.

Troubleshooting

Machine Not Driving or Vibrating Abnormally

Resolving issues with machine movement and vibration.

Schematics

Electrical Diagram and Wire Color Codes

Provides the electrical system diagram and wire color code key.

Toro 77404 Specifications

General

Model	77404
Deck Material	Steel
Starter	Recoil
Mulching Capability	Yes
Bagging Capability	Yes
Side Discharge Capability	Yes
Cutting Width	22 inches
Drive System	Personal Pace