Posted: 6/3/2026 4:02:58 PM EDT
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I have a Husqvarna riding lawn mower that is about 6 years old. Lately, the mower has been going slower and when I go up steep hills, the mower stalls on the hill. The engine keeps running, but the wheels stop moving. From looking online it looks like this may be a drive belt or a transmission issue. Does anyone know how to diagnose the difference between these two problems? If it is a drive belt, how easy are they to replace? |
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Drive belts aren't that bad (usually). Depends on mower. Expect some busted knuckles and cussing. If the drive belt is slipping you should be able to smell it burning. But hydros will quit pulling when they're worn out and get hot. I'm hoping it's just a belt for you. |
| Sounds like the hydro transmission is going out. My folks had a Husqvarna rider years ago. At 100 hours the deck spindle bearings started failing and it only went downhill from there. Box store junk. They finally listened to me and bought lawn equipment at an actual dealer after that. |
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Originally Posted By OregonShooter: Sounds like the hydro transmission is going out. My folks had a Husqvarna rider years ago. At 100 hours the deck spindle bearings started failing and it only went downhill from there. Box store junk. They finally listened to me and bought lawn equipment at an actual dealer after that. Hitting a rock usually kills the spindle's bearing in short order. Luckily its easy to swap the spindles out lol 
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How many hours do you have on the drive belt? I had 125 on Husqvarna when I replaced belt as it was on its last go-round. |
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| We really need to know if it's a hydro or belt/gear drive. [hydro's also use a belt but those wear slowly and don't slip much unless the tensioner is bad and the belt is loose. [I finally replaced my grasshopper hydro belts last year after 23 years of use and frankly, they were still fine, I was just bored. ] |
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There is an idler pulley that applies force on the drive belt. It is controlled by the brake pedal. This tightens the belt causing it 'bite' the drive pulley on the engine and thus turning the driven pulley on the trans....ensure that this idler is present/not worn out/loose and that the spring attached to it is in good shape. After that, inspect the belt. I have changed two drive belts on my Husqvarna that sees "rough use" over the years. Once for wear, once after it actually broke. After that, it is the hydro and they are generally a replace item, not repair. |
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Just got my John Deer E180 riding mower back from the shop. Had the blades sharpened, deck leveled, oil changed, and belts checked to see if they need replacement. I threw the cutting deck belt going over a sapling. I don't recall what I paid but it wasn't bad, $80 to $100. I borrowed a friend's rickety old trailer to take it to the shop and thought to myself, I should really get my own trailer. But is it worth it for once a year?  |
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The drive belt should be fairly easy to check. If it's the hydro, and you don't turn your own wrenches, it's a write-off. If you DIY, there are rebuild kits even for "non-serviceable" hydros, or you can replace the whole unit. As usual, YouTube has instructions for all of it. |
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Originally Posted By drobs: Just got my John Deer E180 riding mower back from the shop. Had the blades sharpened, deck leveled, oil changed, and belts checked to see if they need replacement. I threw the cutting deck belt going over a sapling. I don't recall what I paid but it wasn't bad, $80 to $100. I borrowed a friend's rickety old trailer to take it to the shop and thought to myself, I should really get my own trailer. But is it worth it for once a year? https://www.ar15.com/media/mediaFiles/41568/Mower_PNG-3773210.png If you have a place to store a trailer on site, you should get a trailer. They aren't that expensive, MO offers permanent plates, and you'd be surprised how often you use it, even when you have a truck. The low deck height is much better to work from, rolling large items up the ramp with a dolly/hand truck is a breeze, you can move things by the pallet, and you don't have to worry about damage to paint. There's also the payload issue. Your typical half ton truck only has around 1,500 pounds or so of payload capacity. It obviously averages less in a midsize. A typical single axle utility trailer might have a GVWR of 3k and an empty weight of 800 pounds. You can put 2k pounds on it, still be under capacity, and have a very modest tongue weight. A trailer is one of those things that, once you get used to using one, you'll never want to be without one. |
"Sometimes, the grass is greener because it's on a septic system."
"Sporterizing: The art of spending $700 on a $300 gun to make it worth $200." -GTwannabe
"Sporterizing: The art of spending $700 on a $300 gun to make it worth $200." -GTwannabe
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Good to hear it was a simple fix! I actually like tearing into Hydros, though Attached File |
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Originally Posted By GenYRevolverGuy: If you have a place to store a trailer on site, you should get a trailer. They aren't that expensive, MO offers permanent plates, and you'd be surprised how often you use it, even when you have a truck. The low deck height is much better to work from, rolling large items up the ramp with a dolly/hand truck is a breeze, you can move things by the pallet, and you don't have to worry about damage to paint. There's also the payload issue. Your typical half ton truck only has around 1,500 pounds or so of payload capacity. It obviously averages less in a midsize. A typical single axle utility trailer might have a GVWR of 3k and an empty weight of 800 pounds. You can put 2k pounds on it, still be under capacity, and have a very modest tongue weight. A trailer is one of those things that, once you get used to using one, you'll never want to be without one. Got plenty of room here. I have a boat trail I'm not using that I need to sell and use that $ to buy an utility trailer. |
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Originally Posted By Tug153: I have a Husqvarna riding lawn mower that is about 6 years old. Lately, the mower has been going slower and when I go up steep hills, the mower stalls on the hill. The engine keeps running, but the wheels stop moving. From looking online it looks like this may be a drive belt or a transmission issue. Does anyone know how to diagnose the difference between these two problems? If it is a drive belt, how easy are they to replace? Had the same issue with mine. There is a plug in the hydro-drive that you have to pull/drill out. You can drain all of the fluid out, and then fill it back up (look online to find the type). That got mine back up and running again. The drives on those things really aren't made to be serviced.....so the oil just gets old and worn out. |
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Originally Posted By Tug153: Good news. I found a bunch of grass clippings jammed up in the brake area. I cleaned them all out and the mower works good as new now. I think the clippings were not letting the brake go completely off. This is usually the #1 issue when you have a hydro-driven mower slowing down suddenly. The transmission heats up and starts giving up due to debris. Glad you got it up and going again. I use an air compressor or leaf blower to blast off debris and clippings after every use - it helps a ton. I used to have a big box store Husqvarna riding mower that I sold with 1050 hours on it. It still ran great and was still in good condition - but continuing to use it with that many hours on a residential rider was a gamble. I only buy heavy duty stuff with serviceable hydros now for the peace of mind and longevity. The ‘ol gal with 1050 hours when I sold it: Attached File |
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Some Husqvarnas utilize a CVT transmission in which the CVT belt is on the exterior of the transmission and can be clogged with grass clippings. I would avoid these at all costs. Otherwise, it's a hydro transmission that needs the fluid and filter changed. ETA: Originally Posted By Tug153: Good news. I found a bunch of grass clippings jammed up in the brake area. I cleaned them all out and the mower works good as new now. I think the clippings were not letting the brake go completely off. Great news! |
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