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When you look under the mower do you see two belts ? Top one goes to the rear axle and lower one goes to mower deck spindle.
Your description sounds like the electric clutch is engaging,so if you are seeing two belts coming off the bottom of the engine maybe the belt bounced off a idler pulley on the deck and is not tight enough.
I am wondering if you have the right belt for that machine. or possible its not installed properly.The belt should be tight when engaged. The tightener may not be working as well. These are things to check. Does the belt try to tighten up when you engage it?
I am wondering if the wrong belt was the reason why some one lowered the deck too low.
If the belt bounces then it has stretched or the belt tightener is not working. properly. Also check the shear pin in the drive pulley. If it has sheared the blades will try to turn but slip when any pressure is put on.
First check the belt.Make sure it is tight when the lever is engaged,and the engine is off.Make sure the belt is on all pulleys,and inspect for frays in the belt.If the belt is ok then,run your hand under the fender around the area of the lever.Make sure there is no debris blocking the lever from fully engaging.If that is good.Next inspect the linkage between the lever`s handle and the deck.Again make sure there is no debris and all connections are snug.
Sounds like the mower belt may not be routed correctly around the pulleys or may be running on the wrong side of a belt guard. Also check under the deck to make sure there are no obstructions to the turning of the blade or bent blades....you did not state where the hammering was coming from ( engine or deck ) I can only assume that it is on the deck....so these are the things I would check. Also check the tightness of the bolt on the main pulley sheave (the pulley on the bottom of the engine that drives the belt. the bolt is in the center hole of the pulley) if it is loose it can cause misalignment of the belt and juddering of the deck. If the bolt is tight, remove the belt from the engine pulley sheave and start the engine and look to see that the crankshaft is not bent causing the pulley to wobble....worst case scenario....will require new engine...hope this helps... ;-D
Another possibility, is a broken spring or a tight/ rusted idler pivot arm.
with the engine off & the deck down, engage the pto & pull on the belt to see which pulley is the tensioner
you need to start with your electric clutch and then backwards to your idler pulleys and deck spindles and bearings.
your electric clutch should almost stop the blades instantly when disengaged ,check the center bolt in the clutch to be sure it is tight also
remove the belt from the electric clutch and energize clutch any noise? sometimes the bearing goes bad in the clutch itself.
check all of your 3 spindles for noise and loose. remove belt and spin by hand and listen for quiet and they should turn free with no binding
check blade tightness
any item the belt goes around needs to be looked at for secure and operable.
I had an MTD riding mower, when the mower started the belt should not have been engaging the blade spindle. They're is a clutch lever which goes down to a simple spring tensioner which engages the blade. You may have the tensioner misaligned which will allow the belt to be desheaved. My old manual told me to hold a straight edge along the engine pulley and the driven pulley, like on a table saw. There should be some deflection in the belt, 1/2" over two feet.
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