Question about Toro Lawn Mower With Toro Power Tools

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Lawn mower dies when cutting grass, but will start easily

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  • john andrew manchook May 11, 2010

    engines that die under load can have many issues. 1) weak spark 2) damaged or malfunctioning governor spring or linkage 3) contaminated fuel 4) carburetor issues I would think your mower has good compression if it starts right away. Thats great...most of the stuff I see is great looking equipment with little or no compression left. So you have proven the mower is worth investing in fixing. Weak spark can be caused when the ignition coil gets too hot and is damaged. Sometimes mice will build a winter nest in your lawn equipment and cut off cooling air to the coil! Turning it to scrap! An inline spark tester should tell you if you are losing spark under load. The repair is fairly simple actually. You can buy a new coil online or at a local parts provider and replace the ailing one. You only need a basic set of hand tools and skills to take off the pull starter cover and switch the coils. You have to gap the coil to the flywheel which is simple too. You just take a business card place it between the coil and the flywheel magnet and tighten it up! The governor is a spring and linkage attached to the carb. You can run the mower and have someone watch the linkage to make sure its opening up the throttle as you cut grass. If it doesnt....it probably stuck or dirty or rusty. If its stuck...find the stick or twig or dead critter and get it out! If its dirty hit it with degreaser and rinse it off. If its rusty hit it with some WD-40 or other light penetrating oil and work it back and forth til its moving freely. If you left ANY fuel in the mower dump it out! I mean all of it! You can use a metal pan or bowl and just tip the mower sideways and drain it. *( be sure to remove spark plug wire for safety). Drain the carb is you can. It usually just takes removing the 1/2 inch head main jet from the carb bowl and then pulling down on the bowl itself. Get that gas outta there! And check your gas can before refueling. I know many people who have lost their gas can vent caps and just let the can sit open for ages until there is inches of water in them! Carb issues are a little tougher if you only have basic mechanical skills. A trip to a mower mechanic for a carb service would be best. Check the easy stuff out first and let know what you find ok? Thanks and be careful! John

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 8 Answers

SOURCE: mower wont start

The flywheel key has sheared and it needs to be replaced. Replacing the flywheel key is a fairly straightforward procedure. Otherwise, it will be necessary to take the mower to have someone replace the flywheel key.

Here are some steps to follow to replace the flywheel key on your own (instructions are for a toro 20016 model mower):

  1. block off the blade and driver assembly with a 2x4 to keep it from moving
  2. remove the flywheel nut (regular hand force should be sufficient)
  3. tap the 3 holes on the flywheel (if they aren't already threaded) using 1/4inch 20national tap set
  4. remove the flywheel using a flywheel puller -- a harmonic balancer puller which matches the tecumseh bolt pattern on the flywheel also works using 3 1/4inch thread (20national, 2inch long) bolts with washers
  5. NOTE: (if the blade was removed/reinstalled, tighten the blade to manufacturer's spec of 60lbs) before installing the new flywheel key
  6. remove the sheared flywheel key
  7. clean up the flywheel (wipe off all the dirt and grease)
  8. install the new flywheel key (part 611004 for toro 20016)
  9. install the flywheel (pull the bail brake handle to get the ball-brake inside the flywheel)
  10. tighten the flywheel nut to manufacturer's spec of 37.5lbs
  11. prime the gas bulb, give it a pull and mow away

Posted on Sep 02, 2009

RonInFla
  • 86 Answers

SOURCE: toro lawn mower

ethaanol in fuel...happens when gas sits too long...especially in a gas can in the garage

Posted on Apr 10, 2010

  • 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

barterjoe
  • 338 Answers

SOURCE: We have Toro Lwa 100 Lawn Mower Model #26623.

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

Posted on Mar 02, 2011

2strokeJim
  • 577 Answers

SOURCE: toro recycler model number SR-21 S lawn mower wont

check your oil is it up to full, then I would check to see if you have compresson, pull your plug and roll over and feel with finger ,but don't touch spark plug wire or you will light up! next I would check for spark, then for fuel, make sure the carb is getting fuel,,,check your hoses and fuel cap and clean your carb and needle/seat and make sure gas will run through the fuel line. Also you could have sheared a flywheel key

the choke out you are talking about could of been a lean condition and smoked the eng rings
Good Luck compresson test should tell all 2StrokeJim

Posted on May 18, 2011

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