YTH21K46 (46″) 21HP Lawn Tractor 960 43 0085

Experienced gardeners share their insights in answering this question :
Hi, check the seat switch for continuity with a multimeter, its most likely not working. If ok check that you have battery voltage at the pto plug, if so the pto is no good. Hope this helps, regards Phil.

How to Identify and Fix Common Gardening Problems ?

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If all blades are rotating at the same time, there is no issue with the cutting deck belt that is connecting the blades. If one, or more, blades are not rotating, the cutting deck belt is worn out and needs to be replaced. This should be done by an authorised dealer.
If the PTO clutch is not getting power, if the clutch solenoid is defective, or if the clutch is worn out, the lawn mower blades will not engage. The PTO clutch is not repairable—if the clutch is defective, you must replace it.
Belt-the number one cause for your blades not to engage is that your belt is either stretched or loose causing it to slip or fall off completely. Belt could have snapped also. When you are trying to process too much grass/leaves they could pack up under your deck and push off your belt.
If your blade has stopped turning, but your motor is still running, this usually means that your drive belt has perished and needs replacing. We only supply the drive belts for a select number of models – please contact the customer helpline, or see our website, to check if we can send you the part.
What`s happening? This is a normal function of the seat safety switch. With the blades engaged, weight from the operator allows the seat safety switch to keep the engine running.
A bypass lever is located on the back of the frame, pull out on the lever to move the mower and push it back in before mowing.
The myth of sharpening brand new lawnmower blades stems from the fact that new blades appear dull, but the blades of these lawn power tools are pre-sharpened to a point where they can cut grass, but not cause injury to you.
If the mower vibrates when you engage the cutting blades, there might be a problem with the blade drive system. Deck vibration can be caused by an unbalanced blade, worn pulley or mandrel, bad blade belt or debris caught inside a pulley. Loose nuts or bolts on the pulleys, mandrels or blades can also cause vibration.
The engine powers both the wheels and the blade, just like a walk-behind self-propelled mower. But instead of being directly connected to it by an axle, the blade on most riding mowers is powered by a belt connected to the engine.
The engine powers both the wheels and the blade, just like a walk-behind self-propelled mower. But instead of being directly connected to it by an axle, the blade on most riding mowers is powered by a belt connected to the engine.
A lawn mower blade can get stuck for several reasons, one of which includes over-tightening. Lawn mower blades are supposed to be loose enough to slip when they hit a solid object in order to protect the engine and the blade itself from damage. Lawn mower blades may also get stuck if the bolt is threaded the wrong way.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Why wont my blade engage
ANSWER : Bad pto clutch shorting out

Why my blade wont engage on my toro 74370 zeroturn mower
ANSWER : It has an electromagnetic clutch switch on it,that is more than likely bad. Try this,pull the pto switch out and start the engine,then disconnect the 2 wires coming from the switch and just tap them together and see if they will come on. If they do then you need to replace that switch.

Blades wont ingage on my craftsman lawn tractor #917.274811?
ANSWER : After hitting a tree root, blades will not cut when I press to engage

Put new belt on riding lawn mower now blade wont engage
ANSWER : How many belt on a columbia lawn tractor
Lost traction when cutting grass
do they have a cluth?

The blades wont enguage i put a new switch sitll wont work
ANSWER : Hi, check the seat switch for continuity with a multimeter, its most likely not working. If ok check that you have battery voltage at the pto plug, if so the pto is no good. Hope this helps, regards Phil.

Have a cub zero turn 52 inch cut the blades wont engage it starts but when you pull the switch to turn on the blades it wont engage any help?
ANSWER : Sounds like one of three possible problems ….one – there are safety switches that prevent engagement of the blades,,,,,two – the electric switch which engages the electric clutch blade pulley is bad….or three – the electric clutch blade pulley assembly is bad…..first…..make sure all ur connections are tight to the safety switches and electric clutchblade pulley…..then, if your able to read and follow a wiring diagram, get the wiring diagram for your tractor and a 12 volt probe light (with probe point end) with a ground lead….first, ground the clamp end to the frame and probe at the electric pulley clutch plug to see if power is getting there…if not…follow the wiring diagram to the next switch location the power lead comes from….if one side of the swtich shows power and the other side doesn’t with the switch in the correct run position….then the switch or connection is bad…..if it probes okay…go to the next switch….follow this logic from both sides of the from the electric pulley blade clutch plug until you isolate the switch or plug problem….if everythin tested is good….then it’s the electric clutch pulley assembly that need replacing…..hope this helps…..

I would like to replace the mulching blades on my Sears Craftsman riding mower with regular cutting blades. I can find plenty of sources for new mulching blades, but not cutting blades. My mower is a model 917.259541 tractor and the blades currently on it are part #134149. I want to make sure I get the right size to replace them. Also, is there a source for a bagging system for this mower, that won’t cost as much as one from Sears?
ANSWER : The straight blade for the 42 inch mower is 138971.They cut better and are easier to sharpen and you will need them if you use a gass catcher. If you do not want to use sears for parts you may be able to find good deals on ebay.

Tractor wont start… battery is new… have had to jump start a couple times this season (mower was purchased in 2008 and had tuneup spring 2009, new battery this season since i thought that this was the problem)… when throttle is up and i turn the key, the battery guage registers, the light works, but there is no “click”…. is there a starter? or could it be as simple as a spark plug issue? no connections that i can find appear to be loose….
ANSWER : Check the safety brake/clutch and other safety switches.