Toro 74790 User Manual

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Troubleshooting

Problem

PossibleCauseCorrectiveAction

1.Theengineloadisexcessive.1.Reducegroundspeed.

2.Theoillevelinthecrankcaseislow.2.Addoiltothecrankcase.

3.Thecoolingnsandairpassages

undertheengineblowerhousingare

plugged.

3.Removetheobstructionfromthe

coolingnsandairpassages.

4.Theaircleanerisdirty.

4.Cleanorreplacetheair-cleaner

element.

Theengineoverheats.

5.Dirt,water,orstalefuelisinthefuel

system.

5.ContactanAuthorizedServiceDealer.

1.Theblade-controlswitchisengaged.1.Movetheblade-controlswitchtothe

disengagedposition.

2.Thebatteryisdead.

2.Chargethebattery.

3.Theelectricalconnectionsare

corrodedorloose.

3.Checktheelectricalconnectionsfor

goodcontact.

4.Afuseisblown.4.Replacethefuse.

Thestarterdoesnotcrank

5.Arelayorswitchisdamaged.

5.ContactanAuthorizedServiceDealer.

1.Thefueltankisempty.1.Fillthefueltank.

2.Thechokeisnoton.

2.MovethechokelevertoON.

3.Theaircleanerisdirty.

3.Cleanorreplacetheair-cleaner

element.

4.Thespark-plugwire(s)islooseor

disconnected.

4.Installthewire(s)onthesparkplug.

5.Thesparkplug(s)ispitted,fouled,or

thegapisincorrect.

5.Installanew,correctlygappedspark

plug(s).

6.Thereisdirtinthefuellter.6.Replacethefuellter.

7.Dirt,water,orstalefuelisinthefuel

system.

7.ContactanAuthorizedServiceDealer.

8.Thereisincorrectfuelinthefueltank.

8.Drainthetankandreplacethefuelwith

thepropertype.

Theenginedoesnotstart,startshard,or

failstokeeprunning.

9.Theoillevelinthecrankcaseislow.9.Addoiltothecrankcase.

1.Theengineloadisexcessive.1.Reducethegroundspeed.

2.Theaircleanerisdirty.

2.Cleantheair-cleanerelement.

3.Theoillevelinthecrankcaseislow.3.Addoiltothecrankcase.

4.Thecoolingnsandairpassages

undertheengineblowerhousingare

plugged.

4.Removetheobstructionfromthe

coolingnsandairpassages.

5.Thesparkplug(s)ispitted,fouled,or

thegapisincorrect.

5.Installanew,correctlygappedspark

plug(s).

6.Thefuel-tankventisblocked.6.ContactanAuthorizedServiceDealer.

7.Thereisdirtinthefuellter.7.Replacethefuellter.

8.

Dirt,water,orstalefuelisinthefuel

system.

8.ContactanAuthorizedServiceDealer.

Theenginelosespower.

9.Thereisincorrectfuelinthefueltank.

9.

Drainthetankandreplacethefuelwith

thepropertype.

1.Thebypassvalvesareopen.

1.Closethetowvalves.

2.Thetractionbeltsareworn,loose,or

broken.

2.ContactanAuthorizedServiceDealer.

3.

Thetractionbeltsareoffthepulleys.

3.

ContactanAuthorizedServiceDealer.

Themachinedoesnotdrive.

4.Thetransmissionhasfailed.4.ContactanAuthorizedServiceDealer.

50

Table of Contents

Questions and Answers:

K
Kevin MillerAug 18, 2025
Why won't my Toro 74790 Lawn Mower engine start?
- H
  henrywrightAug 18, 2025
  If your Toro Lawn Mower engine won't start, has difficulty starting, or stalls frequently, several factors could be at play. First, ensure the fuel tank isn't empty by filling it. Then, check that the choke is activated by moving the choke lever to the ON position. A dirty air cleaner can also cause issues, so clean or replace the air-cleaner element. Make sure the spark-plug wire(s) is securely connected to the spark plug. Inspect the spark plug(s) for pitting, fouling, or incorrect gaps, and replace if necessary with a correctly gapped spark plug(s). Also, check for a dirty fuel filter and replace it if needed. Ensure that you are using the correct fuel type; if not, drain the tank and refill with the proper fuel. Finally, verify the oil level in the crankcase and add oil if it is low.
S
Sierra HesterAug 20, 2025
What to do if my Toro 74790 engine won't start?
- A
  Amber LeeAug 21, 2025
  If your Toro Lawn Mower engine does not start, starts hard, or fails to keep running, start by checking if the fuel tank is empty and fill it if necessary. Ensure the choke is on by moving the choke lever to the On position. Inspect the air cleaner for dirt and clean or replace the element. Verify that the spark plug wire(s) is securely installed on the spark plug. Check the spark plug(s) for pitting, fouling, or incorrect gap and replace if needed. If there is dirt in the fuel filter, replace it. If there is incorrect fuel in the fuel tank, drain the tank and replace the fuel with the proper type. Finally, check the oil level in the crankcase and add oil if it is low. If you suspect dirt, water, or stale fuel is in fuel system, contact an Authorized Service Dealer.

Toro 74790 Specifications

General

Engine Displacement	852cc
Start Type	Electric
Cutting Width	60 inches
Cutting Height	1.0 to 5.5 inches
Deck Material	Steel

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