Toro 74178 User Manual

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Operator’s Manual

Domestic English (EN)

Form No. 3327-248

Z150 and Z153

Z Master



with 52 SFS Side Discharge Mower

Model No. 74178—Serial No. 220000001 and Up

Model No. 74197—Serial No. 220000001 and Up

Table of Contents

Other manuals for Toro 74178

Service Manual113 pages

Questions and Answers:

R
Robert WellsAug 19, 2025
Why my Toro 74178 Riding mower engine will not start?
- J
  Justin ColemanAug 19, 2025
  If your Toro Riding mower engine won't start, starts hard, or fails to keep running, several factors could be responsible. Begin by ensuring the fuel tank is filled with gasoline and the fuel valve is open. Check that the choke is engaged. Inspect the air cleaner for dirt and clean or replace the air cleaner element if necessary. Ensure the spark plug wires are securely connected to the spark plugs. Replace any spark plugs that are pitted, fouled, or have an incorrect gap with new, correctly gapped spark plugs. Replace the fuel filter if it's dirty. If the problem persists, it could be due to dirt, water, or stale fuel in the fuel system, and you should contact an Authorized Service Dealer.
K
kevinloweAug 21, 2025
Why Toro Riding mower starter does not crank?
- J
  justin39Aug 21, 2025
  The starter may not crank due to several reasons: the blade control (PTO) is engaged (move it to disengaged), the parking brake is not on (set the parking brake), the operator is not seated (sit on the seat), the battery is dead (charge the battery), electrical connections are corroded or loose (check for good contact), or the fuse is blown (replace the fuse). If none of these resolves the issue, the relay or switch may be defective.
D
David MillerAug 23, 2025
What to do if Toro 74178 engine will not start?
- J
  John RiveraAug 23, 2025
  If the engine won't start, starts hard, or fails to keep running, check the following: ensure the fuel tank is full, the fuel valve is open, and the choke is on. Also, inspect the air cleaner, spark plug wires, and spark plugs. The fuel filter may be dirty. For dirt, water, or stale fuel in the fuel system, contact an Authorized Service Dealer.
J
Jeremy OrtegaAug 26, 2025
How to fix uneven cutting height on my Toro 74178?
- L
  Lee FletcherAug 26, 2025
  To fix uneven cutting height on your Toro Riding mower: * Sharpen the blades. * Replace bent cutting blades. * Level the mower from side-to-side and front-to-rear. * Adjust the gage wheel height. * Clean the underside of the mower. * Adjust tire pressure. If the issue continues, the blade spindle may be bent, requiring you to contact an Authorized Service Dealer.
V
Victor ClarkAug 27, 2025
Why Toro Riding mower engine loses power?
- D
  Darius CampbellAug 28, 2025
  Your Toro Riding mower engine may lose power if the engine load is excessive (reduce ground speed), the air cleaner is dirty (clean it), the oil level in the crankcase is low (add oil), or the cooling fins and air passages are plugged (remove obstructions). Also, check the spark plugs and ensure the vent in the fuel cap is open. Replace the fuel filter if it's dirty. For persistent issues, contact an Authorized Service Dealer.
K
Kevin FrancisAug 30, 2025
Why Toro Riding mower engine overheats?
- M
  Michael SandersAug 30, 2025
  The engine may overheat if the engine load is excessive (reduce ground speed), the oil level in the crankcase is low (add oil), or the cooling fins and air passages are plugged (remove obstructions).
J
jonbarrettSep 1, 2025
How to fix uneven cutting height on Toro 74178 Riding mower?
- K
  Katherine BlackSep 1, 2025
  Uneven cutting height on your Toro Riding mower can occur if the blades are not sharp (sharpen them), the cutting blades are bent (install new ones), the mower is not level (level it), the gage wheel is not set correctly (adjust its height), the underside of the mower is dirty (clean it), or the tire pressure is incorrect (adjust it). If the blade spindle is bent, contact an Authorized Service Dealer.
A
Angela GarzaSep 3, 2025
What to do if Toro Riding mower blades do not rotate?
- S
  susanthomasSep 3, 2025
  If the blades do not rotate on your Toro Riding mower, it could be due to a worn, loose, or broken drive belt (install a new one), a drive belt that is off the pulley (install the drive belt and check adjusting shafts and belt guides for correct position), or a worn, loose, or broken deck belt (install a new deck belt).
N
Nancy SimsSep 5, 2025
What to do if my Toro 74178 Riding mower starter does not crank?
- M
  melindamarshallSep 5, 2025
  If the starter on your Toro Riding mower isn't cranking, several issues could be the cause. First, ensure the blade control (PTO) is disengaged and the parking brake is set. Also, make sure you are seated on the seat. If these aren't the issue, check if the battery is dead and needs charging, or if the electrical connections are corroded or loose, requiring cleaning for good contact. Finally, inspect the fuse and replace it if it's blown. If none of these steps resolve the issue, the relay or switch may be defective, requiring assistance from an Authorized Service Dealer.
A
Adam HarmonSep 7, 2025
Why does my Toro Riding mower engine loses power?
- J
  Joe CalderonSep 7, 2025
  If your Toro Riding mower engine loses power, there are several potential causes. Start by reducing the ground speed, as the engine load may be excessive. Check the air cleaner and clean the air cleaner element if it's dirty. Ensure the oil level in the crankcase is adequate by adding oil if it's low. Clear any obstructions from the cooling fins and air passages under the engine blower housing. Replace any spark plugs that are pitted, fouled, or have an incorrect gap with new, correctly gapped spark plugs. Open the vent in the fuel cap if it's closed. Replace the fuel filter if it's dirty. If the issue persists, there may be dirt, water, or stale fuel in the fuel system, requiring you to contact an Authorized Service Dealer.

Toro 74178 Specifications

General

Brand	Toro
Model	74178
Category	Riding mower
Language	English

Summary

Safety and Introduction

Safety

Essential safety warnings, precautions, and symbols.

General Operation

Slope Operation

Machine Setup and Operation

Controls

Identification and function of all operator controls.

Starting and Stopping the Engine

Step-by-step guide for engine ignition and shutdown.

Adjusting the Height-of-Cut

Maintenance and Servicing

Recommended Maintenance Schedule

A schedule of regular maintenance tasks and intervals.

Servicing the Cutting Blades

Instructions for inspecting, sharpening, and replacing blades.

Servicing the Air Cleaner

Servicing the Engine Oil

Servicing the Hydraulic System

Adjusting the Motion Controls

Replacing the Deck Belt

Adjusting the Parking Brake

Troubleshooting, Storage, and Warranty

Troubleshooting

Common problems, their causes, and solutions.

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