MTD Yard Machine Drive belt adjustment.

A friend of mine broke the front drive belt on her MTD Yard Machine Model 136L660F372 Serial 1A256B90009. I replaced the belt tried doing the adjustment as stated in manual. The front drive belt is slipping on the front pulley coming off the engine.

I am confused how in the worl are you supposed to adjust his damn belt!

HELP!

 

It souldn't have to be adjusted. Are you using a genuine MTD belt? MTD used odd sized belts and you must use exact replacements or you'll have problems. Also, The front and back belts should be replaced as a set. (assuming you're talking about motion drive belts, from the engine to variator and variator to tranny). If the variator has problems, it also could cause belt problems.

 

After taliking to a MTD rep. There is an adjustment. It's called the throttle speed linkage. A rod that connects from the variable speed pulley assembly to the shaft that the brake assebmly attaches to. I followed their proceedure and BANG!

Mower is fixed no belt slip in fact goes like hell. FYI was an MTD Belt and according to the representitive you would ahve to make the adjustment when ever you change the belt.

 

I didn't say there isn't an adjustment, just that it shouldn't have to be adjusted. If you're replacing a belt with the exact same belt, there is no need to adjust anything. I wonder if something was out of whack with the old belt, or the one you now have. In any case, glad you got it going and thanks for the update!

 

I hope it is ok to ask a question on this thread which is already started.
I have a Yard machines mower which has the same problem.
My friend brings it to me and it will not not move unless the tranny is in neutral. Thinking oh it just needs adjusted, tried over and over again with minimal luck. I have the book and followed directions to the letter except for the book states to hold the clutch pedal just to where the brake rod "STOP" just touches the frame and continue from there. anyhow there is no brake rod stop on this mower (but there is on my older MTD mower which is very similar) So I mimicked the about position of the brake rod using my old as a guide, and then set the speed control and then moved onto setting the neutral, well it was closer but as the motor runs it seems to get the front belt going with enough power to propel the mower.
I thought ok I will adjust it a little further but that makes the brake not work and if I go the other way it makes it engage worse. I am adjusting it according to directions and all around.
the model number is 13ax675g062 mtd 42"
the belt looks kinda worn and I am thinking that it is the only thing left to fix
oh I took the variable pulley off and it seems fine
any ideas will be appreciated

 

Actually MTD manuals do state that this adjustment should be done whenever a belt is replaced.

 

Yes, I understand that. What I am getting at is that if you are installing a belt the exact same size as the belt that was on it when it left the factory, and no-one has tinkered or messed with anything, then a little adjustment shouldn't be causing this problem. There should be little or no need for adjustment at all.

 

I think MTD allows for belts never being exactly the same maybe

 

I have changed many of these and never found a need to make any adjustments just for new belts.

 

Me too, been changing them for years. If you need to make adjustments, you are compensating for something else that changed.

 

My neighbor has an MTD Yard-man Model T604G AutoDrive that he is kind enough to let me borrow since I help with the maintenenace.

We have replaced all of the belts and at this point it seems as thought the drive and/or transmission belt are too tight - the mower will move in F or R with pressing the accelerator and will even move in N under its own power. Additionally, the brake is not working now so shifting is a little tricky. After reading this thread, I'm thinking the two issues may be a result of the same cause. Thoughts?

Also, if the mower gets pinned against a fence, tree, etc. becasue of the inability to stop and you disengage the blades and the kill the power, it will not re-start. I'm thinking that the mower still thinks things are engaged ans soem safety feature is preventing it from starting. Any tricks?

Thanks!

 

Your belts are probably jammed in the engine pulley, keeping it from turning.

 

Meant to say that it will move under its own power in F, N, or R without pressing the accelerator. By saying that I think the belts being too tight, I mean there is no slack and it seems that it is always engaged and not just when the accelerator is pressed. My neighbor indicated that it will eventually stop in N - not certain how long that takes, but will try it out tomorrow evening. I would think that if the belts were pinched, we would have no power and/or the belts would squeal/smoke - not having any of those symptoms. With the brake not working now - mower still moves under its own power when you use the brake - you have to shift on the fly in that sweet spot where you let off the acclerator and it slows before its own power starts to move it again. That, in turn, leads to it possibly getting wedged against a fence or tree and the whole problem with killing it, forcing into N and then not being able to get it restarted for a while - thus far we've been luck, but not sure what the real trick is to restarting it after such an occurrence. Is there an adjustment to the throttle or any belt pulley that woudl correct this? Anything else?

Is the issue with the brake at all related to the belts and that issue above? If not, any ideas on what it may be? Prior to changing the belts, the brake was rarely used (only to start the engine or if soipping on a hill) as letting off the accelerator was enough to stop it from moving in F or R on level ground.

Thanks for chiming in!