My Toro mower is 7 yrs old. 3 speeds, blade clutch. When going thru tall grass (3" cut), the blade slows down and will stop turning even moving forward on slowest speed. I have to stop and lift the mower's front wheels and allow the blade to resume its speed. This mower used to be able to cut the same 3" of grass in the rain without slowing down! Something is wrong.
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Re: 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
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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.
There is not a governor on newer mowers. Ease mower thru grass slowly, if starts to slow down stop, let mower speed up. In tall grass only use 1/2 of the deck width with side discharge open. Ensure spark plug is clean and gapped properly, replace once a year. Ensure air filter is clean, replace once a year. Ensure oil is full. 30w oil. Always use Stabile in gas. Use carb cleaner and clean outside of carb to ensure choke lever is free to rotate.
Not enough torque. Only use 1/2 width of deck on tall grass, go real slow, Ensure side discharge is open! Ensure blade is sharp. Replace spark plug once a year and clean replace air filter. check oil level 30woil.
Some self-propelled mowers include a speed control, but sometimes it may seem that no matter how you adjust it, the mower just creeps along at a snail's pace. Most likely this isn't a mechanical malfunction, but an adjustment is probably needed.
Very tall or thick grass can bog down a self-propelled mower, but adjusting the height of the blade may allow it to roll through and cut the grass at normal speeds. If the blade is low, the amount of cutting required may slow down the movement of the entire mower. The frame of the mower may also stick in the high grass. Raise the blade little by little until the mower rolls at the appropriate speed. Going up hills may cause a similar response.
It's possible the drive belt on the mower can slip. Inspect this part to see if it is loose or cracked, and replace the belt to restore power.
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.
If the grass is very tall (more than 10") you will have to slow down to less than 1 mph, if you have a mulch kit on this unit, remove it to get the grass out as quickly as possible. Also, sharp blades & a level deck are important.
You mention many PM issues but do not mention a blade sharpening. I don't get on my ZTR without a freshly honed blade installed. "That's" what cuts bahia grass...the blade. You can put all the horsepower you want behind the lade but if you're trying to cut grass with a 2X4 it rips more than cuts grass.