MTD riding mower jerky drive
#1
01-22-21, 08:00 AM
MTD riding mower jerky drive
My MTD riding mower model #13AH660F352 while in gear and driving is constantly jerking. I changed both belts but that didn't change anything. It started to do it in the spring and continued to get worse throughout the summer. I'm thinking that it's something in the transmission but would like to get confirmation from you experts and also how to fix it.
Any help would be appreciated.
Any help would be appreciated.
#3
01-22-21, 08:41 AM
Probably a long shot, but you might jack up the rear end and make sure the wheels are firmly attached to the axles and that neither has a broken key. A year or so ago a buddy asked me to look his relatively similar Cub that had come to a halt, and after the fact told me that it had been jerking for a while, but we jacked it up and pulled one of the rear wheels right off, hub and all.
#6
01-22-21, 10:31 AM
At 20 YO this sounds like a "normal wear-out failure" rather than caused by a factory defect.
It may be easier to find when it fails outright and from your description that won't be long.
Sounds like this is a repair/replace decision and the price of parts is sometimes such that you will be on the fence with this decision.
It may be easier to find when it fails outright and from your description that won't be long.
Sounds like this is a repair/replace decision and the price of parts is sometimes such that you will be on the fence with this decision.
#7
01-22-21, 10:53 AM
I just tried jacking it up and checked the wheels and they both look good and are attached. I put it in gear to check if it was engaging and it is.
Have you ever tried taking the trans/gearbox apart? Can I get parts for it?
Have you ever tried taking the trans/gearbox apart? Can I get parts for it?
#9
01-22-21, 01:38 PM
You gear box my not have a differential. Check by jacking up rear wheels. If you can turn one wheel while holding the other, you have a differential. If not you have a solid axle. On a solid axle, the rear wheel on inside of a turn must rotate the same number of revolutions as the outside wheel, yet travel a shorter distance. The result is the inside wheel jerks to add the needed distance.
#10
01-22-21, 05:15 PM
With the engine off, can you move either back wheel back and forth through a small angle? This should give you a reading of total gear backlash all the way back to the engine output shaft.
#13
01-23-21, 01:18 PM
I checked the rear wheels with it jacked up and in gear and they both won't turn so there must not be a differential. While in neutral I could turn the wheels independently. One wheel with turn about 4 inches while holding the other and vice versa. If I jack it up and put it in gear and run it the mower wheels run smooth with no jerking. When I put it on the ground that's when it will jerk. It doesn't matter if I'm turning or going straight it jerks. I didn't notice any whining while it was moving.
If the tranny is bad are they rebuildable? Can I get parts for it?
If the tranny is bad are they rebuildable? Can I get parts for it?
#14
01-23-21, 01:36 PM
I'd replace the unit as an assembly. I rebuilt some of those years back and for the cost, time involved, and case wear you will have, I don't think rebuilding them is a viable option anymore..We just replace them or junk the mower these days.
