Question about Toro Lawn Mower With Toro Power Tools

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Toro Model 20439. Motor runs fine but the sharp blade slows down and fails to cut grass. Is there a clutch between the motor and the blade? It there an adjustment that can be made or should I take it in to the repair show. Above average ability to repair things.

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Posted on Jan 02, 2017

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  • 5 Answers

SOURCE: I have a 1988 Model

Yes, it sounds like you need to adjust the blade brake clutch (BBC). I have a PDF service manual that explains it. If you post your email address I can upload it to you. Here's an excerpt from the manual:

BBC
BBC Adjusting the Blade Brake
1. Stop the engine. Pull the wire off the spark plug.
2. Remove the two screws securing the screen
panel to the top of the mower housing as shown
in Figure 22. Remove the panel. (The panel they're
referring to is the red screen between the motor
and handle.)
3. Move the control bar down and lift up against the
handle. With the control bar against the handle,
measure the spring length (L) at the front of the
spring as shown in Figure 26.
4. If the spring dimension is greater than 32 mm
(1-1/4") an adjustment is needed.
5. To adjust, loosen the bottom jam nut on the blade
brake cable as shown in Figure 27. Adjust the top
jam nut until spring dimension is as near as
possible to nut; not less than 25 mm (1") See
note below.
NOTE: Adjusting the top jam nut too high can
cause the cable end to crush the plastic fitting
when the control bar is moved up against the
handle. If the spring cannot be adjusted to less
than 32 mm (1-1/4") before the cable end
contacts the plastic fitting, the clutch belt is worn
out and should be replaced. After replacing the
belt, adjust the cable per the above procedure.
NOTE: 1990 and newer models are equipped
with finger tip adjusters that do not require tools.
Use the same adjustment criteria on these
cables.

Posted on Oct 03, 2010

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SOURCE: My Toro mower is 7 yrs old. 3 speeds, blade

I've noticed that when the blade get dull it work harder a cutting tall grass. I just put a new blade on mine and now it runs and sounds like a brand new mower. also if the inside of the deck is coated with old grass that makes a differance too

Posted on Jun 24, 2009

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1 Answer

Cutting Blades going too slow


if it is an older mower or has a lot of hours on it it is possible that the deck belts have stretched or wore out. if it runs fine in short grass but slows down in taller grass that is a sign of a wore belt. replace and it should be good. also be sure your blades are sharp. that will have a effect on its cutting capability.

May 06, 2016 | Garden

2 Answers

Why would a riding mower have the blade turning slow?


If speed varies depending on how much grass you are cutting, look for loose or badly worn belt. If constant slow speed when engine is running at full noise can only be a slipping on pulley or clutch. Most likely clutch. Normally slipping generates much heat so look to your clutch or pulleys. If drive key has separated there will be damage to shaft with metal dust showing.

Jul 21, 2014 | Toro Garden

1 Answer

Mtdproducts com


This most often happens when you are mowing too much grass at once, or when the deck (or chute if you have a bagger) is clogging for some reason. Sometimes this is made worse by having dull blades. Usually mowing at a slower speed or mowing more frequently will help solve this. If the motor is struggling with the blades, these are usually the culprits. Clean your deck thoroughly, cut the lawn more often, or cut it slower.

In some cases, if your PTO belt may be worn, stretched, or need adjustment. When this happens, the motor will not slow down with the blades but will keep running normally and you may smell a burning rubber smell as the blades slow down.

Jul 16, 2013 | Garden

1 Answer

I have a 1988 Model 26624, 21" Key-Lectric mower. I've noticed over a period of time that the mower blade slows considerably when cutting the lawn. At first, I thought it may be grass accumulation under...


Yes, it sounds like you need to adjust the blade brake clutch (BBC). I have a PDF service manual that explains it. If you post your email address I can upload it to you. Here's an excerpt from the manual:

BBC
BBC Adjusting the Blade Brake
1. Stop the engine. Pull the wire off the spark plug.
2. Remove the two screws securing the screen
panel to the top of the mower housing as shown
in Figure 22. Remove the panel. (The panel they're
referring to is the red screen between the motor
and handle.)
3. Move the control bar down and lift up against the
handle. With the control bar against the handle,
measure the spring length (L) at the front of the
spring as shown in Figure 26.
4. If the spring dimension is greater than 32 mm
(1-1/4") an adjustment is needed.
5. To adjust, loosen the bottom jam nut on the blade
brake cable as shown in Figure 27. Adjust the top
jam nut until spring dimension is as near as
possible to nut; not less than 25 mm (1") See
note below.
NOTE: Adjusting the top jam nut too high can
cause the cable end to crush the plastic fitting
when the control bar is moved up against the
handle. If the spring cannot be adjusted to less
than 32 mm (1-1/4") before the cable end
contacts the plastic fitting, the clutch belt is worn
out and should be replaced. After replacing the
belt, adjust the cable per the above procedure.
NOTE: 1990 and newer models are equipped
with finger tip adjusters that do not require tools.
Use the same adjustment criteria on these
cables.

Sep 18, 2010 | Toro Lawn Mower With Toro Power Tools

1 Answer

Blade slows down when grass gets thick


Hello,

The reason the blade slows down when the grass gets thick is simply because the mechanism operating the blade is weak and cannot move fast when on thick grass.

I suggest you troubleshoot the mower. After that, the blade should work fine when the grass gets thick.

Also, some mowers normally gets slow when grass gets thick, so after troubleshooting, if the mower does the same, then you already know it has to be slow when trying to cut thick grasses.

Take care

Sep 09, 2010 | Toro Personal Pace CARB Walk Power Mower

1 Answer

We have Toro Lwa 100 Lawn Mower Model #26623. Power engaged, start mowing but lawn mower will not cut grass. You have to stop and let it rev up again to cut more grass.


This 1991-92 model is equipped with a blade brake clutch. When the blade slows down this means the belt is slipping. This slipping can be caused from a few different things.
1 --A loose cable. barterjoe_0.gif
Try adjusting the blade cable on the upper handle. this unit has an adjustable section. make sure the cable is not so tight that you snap it.
2 --A sticky pivot point under the belt cover
The belt cover in the back builds up with dirt and debris. Make sude it is clean under the cover and all of the pivots move freely. ( do this with the engine off)
3 --A sticky belt tensioner under the deck cover
The underside of this machine has a metal cover to protect the belts. Remove it and check that the blade belt idler arm is not frozen in place. this will cause the belt not to enguage all the way.
4 --A worn belt or belt pulley
The large flywheel and pulley can wear. Check this if the belt looks good.
This is all there is to the machine BBC system.
I hope this helps.

Get parts and more diagrams at a Master Toro Dealer like www.arcolawn.com
barterjoe_52.png

Jun 06, 2010 | Toro Lawn Mower With Toro Power Tools

1 Answer

My Toro mower is 7 yrs old. 3 speeds, blade


I've noticed that when the blade get dull it work harder a cutting tall grass. I just put a new blade on mine and now it runs and sounds like a brand new mower. also if the inside of the deck is coated with old grass that makes a differance too

Jun 23, 2009 | Toro Lawn Mower With Toro Power Tools

1 Answer

Very little grass is shooting into the bag to fill it


Hello monica_skinn:

If the Underside of the Deck is Clean and the Blades are Tightened Properly, then the Problem is Caused by the Blade Lifts being Worn or the Blades are Not a High Lift (Bagger Blade) Blades.
A Bagger Blade has a Very High Lift Ear on the Backside of the Blade Across from the Cutting Edge. This Extra Lift is What Gives the Extra Lift and Throw (by increasing air Flow under the Mower) the Grass gets to be Bagged.
Please, Do Not Hesitate, If you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance.
Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Be Happy. Thanks.

Good Luck

Respectfully

jbridger (John)

May 11, 2009 | Toro Lawn Mower With Toro Power Tools

1 Answer

Mower won't start


13 to 15 amps electric or battery operated mower may runs slow when cutting thick grass. also recommended not to cut grass when it's wet & need very sharp blade to do the lawn. may overloading it, cutting grass too thick also draws too much power. check house breaker first.

Jun 11, 2008 | Black & Decker 19" Electric Lawnhog...

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