Toro 74978 - User Manual

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FormNo.3377-739RevA

ZMaster

®

Professional6000

SeriesRidingMower

with60inor72inTURBOFORCE

®

Side

DischargeMower

ModelNo.74978—SerialNo.313000001andUp

ModelNo.74979—SerialNo.313000001andUp

G021416

Registeratwww.Toro.com.

OriginalInstructions(EN)

*3377-739*A

Table of Contents

Questions and Answers:

H
Hailey MullenAug 28, 2025
What to do if my Toro 74978 Lawn Mower engine loses power?
- N
  Nicole HerreraAug 28, 2025
  If your Toro Lawn Mower engine is losing power, consider the following: * Reduce the ground speed if the engine load is excessive. * Clean the air-cleaner element. * Add oil to the crankcase if the oil level is low. * Remove any obstructions from the cooling fins and air passages above the engine. * Clean or replace the fuel cap if the vent hole is plugged. * Replace the fuel filter if it is dirty.
C
crystal85Aug 27, 2025
Why won't my Toro 74978 engine start, starts hard, or fails to keep running?
- K
  Kathy GriffithAug 27, 2025
  If your Toro Lawn Mower engine will not start, starts hard, or fails to keep running, fill the fuel tank, open the fuel shutoff valve and add oil to the crankcase. Ensure that the throttle control is midway between the “SLOW” and “FAST” positions. Also, replace the fuel filter, clean or replace the air cleaner element, check the seat switch indicator (replace the seat if needed), check the electrical connections for good contact (clean the connector terminals thoroughly with electrical contact cleaner, apply dielectric grease, and reconnect), clean, adjust, or replace the spark plug and check the spark plug wire connection. If problems persist, contact an Authorized Service Dealer.
J
Jennifer WatsonAug 27, 2025
Why Toro Lawn Mower blades do not rotate?
- J
  Jennifer WallerAug 27, 2025
  If the blades on your Toro Lawn Mower aren't rotating, it could be due to a worn, loose, or broken mower deck belt; in this case, install a new deck belt. Another possibility is that the mower deck belt is off the pulley; reinstall it and check the idler pulley, idler arm, and spring for correct position and function. Also, check the pump drive belt for wear, looseness, or breakage, and adjust the belt tension or install a new belt. Finally, inspect the idler spring and replace it if it's broken or missing.
M
Mercedes LangSep 3, 2025
What causes my Toro 74978 engine to lose power?
- R
  Rebecca LarsenSep 3, 2025
  A loss of power in your Toro Lawn Mower engine can stem from several causes. The engine load might be excessive, so reduce the ground speed. Check the air cleaner element; if it's dirty, clean it. Ensure the oil level in the crankcase is sufficient by adding oil if needed. Clear any obstructions from the cooling fins and air passages above the engine, and clean or replace the fuel cap if the vent hole is plugged. Also, replace the fuel filter if it's dirty. For issues like dirt, water, or stale fuel in the fuel system, contact an Authorized Service Dealer.
M
Michael BartlettSep 5, 2025
What to do if my Toro Lawn Mower machine vibrates abnormally?
- L
  lgriffithSep 5, 2025
  If your Toro Lawn Mower is vibrating abnormally, it could be due to: * Bent or unbalanced cutting blade(s); install new cutting blade(s). * A loose blade mounting bolt; tighten the blade mounting bolt. * Loose engine mounting bolts; tighten the engine mounting bolts. * A loose engine pulley, idler pulley, or blade pulley; tighten the appropriate pulley.
C
Corey MyersSep 7, 2025
What causes abnormal vibrations in my Toro 74978?
- L
  Lorraine RussoSep 7, 2025
  If your Toro Lawn Mower vibrates abnormally, try the following: 1. Install new cutting blade(s). 2. Tighten the blade mounting bolt. 3. Tighten the engine mounting bolts. 4. Tighten the appropriate pulley.
W
Wendy BarajasSep 18, 2025
What should I do if the oil-pressure light is on and the engine rpm is low on my Toro 74978?
- S
  Steven BellSep 18, 2025
  If the oil-pressure light is on and the engine rpm is low on your Toro Lawn Mower, it means the engine-control unit has limited engine rpm, known as “limp” mode. Let the engine cool and check the engine-oil level. If the level is above the “add” line, contact an Authorized Toro Service Dealer.
M
Michael Gonzalez MDSep 15, 2025
Why won't my Toro Lawn Mower drive?
- J
  Jeffrey MooreSep 15, 2025
  If your Toro lawn mower isn't driving, check if the by pass valves are not closed tight and tighten them. Also, inspect the pump belt for wear, looseness, or breakage and change the belt if needed. Ensure the pump belt is on a pulley. Replace any broken or missing idler spring. Lastly, check the hydraulic oil level and add hydraulic oil to reservoirs or let it cool down if it's too hot.
B
Benjamin JohnsonAug 25, 2025
Why is my Toro 74978 Lawn Mower resulting in an uneven cutting height?
- G
  Gloria LawsonAug 26, 2025
  If mowing results in an uneven cutting height with your Toro Lawn Mower, try the following: 1. Sharpen the blade(s). 2. Install new cutting blade(s). 3. Level the mower deck from side-to-side and front-to-rear. 4. Clean the underside of the mower. 5. Adjust the tire pressure.
A
Arthur HardyAug 25, 2025
How to fix a Toro 74978 when the starter does not crank?
- C
  Cody WrightAug 25, 2025
  If the starter on your Toro Lawn Mower doesn't crank, here are some things to check: 1. Move the blade control switch (PTO) to disengaged. 2. Set the parking brake. 3. Ensure that the drive levers are in the neutral lock position. 4. Sit on the seat. 5. Charge the battery. 6. Check the electrical connections for good contact. 7. Replace the fuse.

Toro 74978 Specifications

General

Brand	Toro
Model	74978
Category	Lawn Mower
Language	English

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