Toro 39678 User Manual

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FormNo.3436-971RevA

CommercialWalk-BehindMower

FixedDeck,T-Bar,GearDrivewith48in

TURBOFORCE

®

CuttingUnit

ModelNo.39678—SerialNo.405457997andUp

Registeratwww.Toro.com.

OriginalInstructions(EN)

*3436-971*A

Table of Contents

Questions and Answers:

J
Jennifer MorrisonAug 17, 2025
What to do if my Toro Lawn Mower engine overheats?
- T
  Tyler KnoxAug 17, 2025
  If your Toro Lawn Mower engine is overheating, it could be due to several reasons. First, try reducing the ground speed, as the engine load may be excessive. Check the oil level in the crankcase and add oil if it's low. Ensure that the cooling fins and air passages under the engine-blower housing are free from obstructions. Also, a dirty air cleaner can cause overheating, so clean or replace the air-cleaner element. If these steps don't resolve the issue, it could be due to dirt, water, or stale fuel in the fuel system, which requires contacting an Authorized Service Dealer.
L
Laura BestAug 21, 2025
Why is my Toro 39678 engine losing power?
- J
  Jill JonesAug 21, 2025
  If your Toro Lawn Mower engine loses power, there are several potential causes. Start by reducing the ground speed if the engine load is excessive. Clean the air-cleaner element if it's dirty. Check the oil level in the crankcase and add oil if necessary. Remove any obstructions from the cooling fins and air passages under the engine blower housing. Replace the spark plug if it's pitted, fouled, or the gap is incorrect. If the fuel-tank vent is blocked, or there is dirt in the fuel filter, or there is dirt, water, or stale fuel in the fuel system, or the fuel tank has incorrect fuel, contact an Authorized Service Dealer, replace the fuel filter, drain the tank and replace the fuel with the proper type, respectively.
S
Sean AlvarezAug 25, 2025
How to fix a Toro 39678 Lawn Mower when the starter does not crank?
- M
  mary62Aug 25, 2025
  If the starter on your Toro Lawn Mower doesn't crank, there are a few things you can check. First, make sure the PTO (Power Take-Off) is disengaged. Next, inspect the electrical connections to ensure they are clean and making good contact. If you find a blown fuse, replace it. If the issue persists, a relay or switch may be damaged, and you should contact an Authorized Service Dealer.
A
anthonycarrAug 27, 2025
What to do if the blades do not rotate on my Toro 39678?
- E
  Eddie NicholsAug 27, 2025
  If your Toro Lawn Mower blades do not rotate, several issues could be the cause. A worn, loose, or broken drive belt can prevent rotation, so install a new drive belt. If the drive belt is off the pulley, install the drive belt and check the adjusting shafts and belt guides for the correct position. A faulty power-takeoff (PTO) switch or PTO clutch can also be the culprit, requiring you to contact an Authorized Service Dealer. Lastly, inspect the mower belt; if it's worn, loose, or broken, replace it with a new one.
L
lisamontgomeryAug 30, 2025
How to fix uneven cutting height on my Toro 39678?
- E
  Eric ReedAug 30, 2025
  If your Toro Lawn Mower's cutting height is uneven, consider the following: Ensure the blade(s) is sharp; if not, sharpen them. Replace the cutting blade(s) if they are bent. Level the mower from side-to-side and front-to-rear. Clean the underside of the mower deck. Adjust the tire pressure to the correct level. If a blade spindle is bent, contact an Authorized Service Dealer.
J
Jerry BryanSep 3, 2025
What to do if my Toro 39678 Lawn Mower does not drive?
- P
  potterjoshuaSep 3, 2025
  If your Toro Lawn Mower does not drive, ensure the shift lever is not in the NEUTRAL position; move it to a drive gear position. If the traction belts are worn, loose, or broken, or if the traction belt is off a pulley, or if the idler spring is broken or missing, contact an Authorized Service Dealer.
A
Angelica LowerySep 6, 2025
Why is my Toro 39678 vibrating abnormally?
- C
  Carolyn ChaseSep 6, 2025
  If your Toro Lawn Mower is vibrating abnormally, several components could be the cause. Start by checking the cutting blades; if they are bent or unbalanced, install new ones. Tighten the blade mounting bolt if it's loose. Also, tighten the engine mounting bolts if they are loose. Check the engine pulley, idler pulley, or blade pulley; if any are loose, tighten the appropriate pulley. If the engine pulley is damaged, the blade spindle is bent, or the motor mount is loose or worn, contact an Authorized Service Dealer.
K
Kathleen MartinezSep 10, 2025
Why is the fuel tank collapsing on my Toro 39678 Lawn Mower?

Toro 39678 Specifications

General

Brand	Toro
Model	39678
Category	Lawn Mower
Language	English

Summary

Safety

General Safety Precautions

Follow all safety instructions and warnings to avoid serious personal injury and damage.

Controls

Control Panel Layout

Details the location and function of various controls on the control panel.

Operation

Before Operation Safety

Essential safety checks and procedures to perform before starting the machine.

Fuel Safety

Safe Fuel Handling and Storage

Guidelines for safely handling, storing, and using gasoline and fuel additives.

During Operation

During Operation Safety

Critical safety measures to follow while operating the mower.

Slope Safety

Safe Operation on Slopes

Procedures and precautions for operating the mower safely on sloped terrain.

Starting the Engine

Engine Starting Procedure

Detailed steps for starting the mower's engine, including choke and throttle usage.

Shutting Off the Engine

Engine Shutdown Procedure

Proper steps to safely shut down the mower's engine.

Operating the Blade-Control Lever (PTO)

Engaging and Disengaging Mower Blades

How to use the blade-control lever to engage and disengage the mower blades.

Using the Safety-Interlock System

Safety Interlock System Operation

Explains the function of safety interlocks and how to test their operation.

Adjusting the Height of Cut

Blade Height Adjustment

How to adjust the cutting height by modifying blade spacers.

Maintenance

Maintenance Safety Guidelines

Critical safety rules to follow before, during, and after performing maintenance.

Recommended Maintenance Schedule(s)

Maintenance Service Intervals and Procedures

Schedule of maintenance tasks based on operating hours.

Engine Maintenance

Engine Safety Precautions

Safety rules specifically related to engine maintenance.

Servicing the Engine Oil

Checking and Changing Engine Oil

Procedures for checking the oil level and changing the engine oil and filter.

Fuel System Maintenance

Fuel System Servicing Procedures

Instructions for draining the fuel tank and replacing the fuel filter.

Brake Maintenance

Parking Brake Check and Adjustment

Procedures for checking and adjusting the parking brake for secure holding.

Belt Maintenance

Belt Inspection and Replacement

Adjusting the Mower Belt Tension

Mower Belt Tension Adjustment

Mower Deck Maintenance

Blade Safety Precautions

Troubleshooting

Common Problems and Solutions

A guide to identifying and resolving common issues encountered with the machine.

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