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Toro 74978 - User Manual

Toro 74978
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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

  • 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.
  • C
    Christine WilliamsSep 9, 2025
    What to do if my Toro Lawn Mower clutch does not engage?
    • A
      Andre BrownSep 9, 2025
      If the clutch on your Toro Lawn Mower doesn't engage, it could be due to a blown fuse, low voltage supply at the clutch, a damaged coil, inadequate current supply, or a rotor/armature air gap that is too large. To address this, replace the fuse, check the coil resistance, battery charge, charging system, and wiring connections, and replace components if necessary; repair or replace the clutch lead wire or electrical system and clean the connector contacts; remove the shim or replace the clutch.
  • 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.
  • M
    mharperSep 23, 2025
    What causes abnormal vibration in my Toro Lawn Mower?
    • A
      Andrea LoganSep 23, 2025
      Abnormal vibration in your Toro Lawn Mower can arise from several sources. Check if the cutting blades are bent or unbalanced and replace them if necessary. Ensure the blade mounting bolt is tight. Also, tighten the engine mounting bolts. Verify that the engine pulley, idler pulley, or blade pulley isn't loose and tighten it if needed. For a damaged engine pulley, bent blade spindle, or loose/worn motor mount, contact an Authorized Service Dealer.
  • S
    stevenenglishSep 15, 2025
    What causes the clutch to not engage on my Toro 74978 Lawn Mower?
    • K
      Katherine SheppardSep 15, 2025
      If the clutch on your Toro lawn mower won't engage, it could be due to a blown fuse, so replace the fuse. Check for low voltage supply at the clutch, and inspect the coil resistance, battery charge, charging system, and wiring connections, replacing if necessary. Also, inadequate current supply can be a factor; repair or replace the clutch lead wire or electrical system and clean connector contacts. Finally, if the rotor/armature airgap is too large, remove a shim or replace the clutch.
  • S
    Scott HarveySep 12, 2025
    What to do if the clutch does not engage on my Toro Lawn Mower?
    • M
      moralesandreaSep 12, 2025
      If the clutch does not engage on your Toro Lawn Mower, start by replacing the fuse if it is blown. Check the coil resistance, battery charge, charging system, and wiring connections, and replace components if necessary. Also, check the coil and replace the clutch if it is damaged. Repair or replace the clutch lead wire or electrical system if there is inadequate current supply, and clean the connector contacts. Finally, remove the shim or replace the clutch if the rotor/armature air gap is too large.
  • 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.
  • R
    Richard GarciaNov 25, 2025
    Why Toro 74978 engine does not start?
    • G
      gblackburnNov 25, 2025
      The engine may not start due to several reasons. The fuel tank could be empty, so fill it. The fuel-shutoff valve might be closed, so open it. The oil level in the crankcase could be low, so add oil. The throttle may not be in the correct position, so be sure that the throttle control is midway between the slow and fast positions. The fuel filter might be dirty, so replace it. The air cleaner might be dirty, so clean or replace the air-cleaner element. The seat switch may not be functioning properly, so check the seat-switch indicator and replace the seat if necessary. The electrical connections may be corroded, loose, or damaged, so check the electrical connections for good contact, clean the connector terminals thoroughly with electrical-contact cleaner, apply dielectric grease, and make...
  • M
    Michelle HatfieldAug 30, 2025
    How to fix uneven cutting height on Toro 74978?
    • C
      Christopher ThomasAug 30, 2025
      To fix an uneven cutting height on your Toro Lawn Mower, start by sharpening any dull blades or installing new ones if bent. Ensure the mower deck is level from side-to-side and front-to-rear. Clean the underside of the mower deck, adjust the tire pressure to the correct level. For a bent blade spindle, contact an Authorized Service Dealer.
  • T
    Toni Gilmore DDSAug 30, 2025
    Why is my Toro 74978 resulting in uneven cutting height?
    • J
      James JohnsonAug 30, 2025
      If your Toro Lawn Mower is mowing with an uneven cutting height, several factors could be responsible. Ensure the blades are sharp; if not, sharpen them. Bent cutting blades can also cause this, so install new ones. Check if the mower deck is level from side-to-side and front-to-rear, and adjust as needed. A dirty underside of the mower can interfere with cutting, so clean it. Also, verify that the tire pressure is correct. For a bent blade spindle, contact an Authorized Service Dealer.

Toro 74978 Specifications

General IconGeneral
BrandToro
Model74978
CategoryLawn Mower
LanguageEnglish

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