Yanmar SA325 newbie

[YanmarGuy]

I have owned and operated hydrostatic tractors and equipment. This new Yanmar SA325 will roll on the slightest slope. If i take my foot off the pedal, I have to quickly hit the brake. I don’t think this should be happening unless it’s a Yanmar thing. Any SA owners comment please.

 

[Yander]

Welcome YanmarGuy!

It's a tractor thing. Our Massey hydro will do the same thing. I recommend set the brake or drop an implement or loader bucket.

 

[YanmarGuy]

Welcome YanmarGuy!

It's a tractor thing. Our Massey hydro will do the same thing. I recommend set the brake or drop an implement or loader bucket.

I hear what you’re saying but, neither my Kubota BX or the L3902 does it. I was working some dirt on a slope and lifted my foot looking back at my work when it started rolling. I have to constantly push the fwd pedal to keep it from rolling. It’s a little unsettling. That’s why I was asking if other SA325/425 folks operated the same manner.

 

[Mtsoxfan]

My 2017 sa325 only rolled if it was above a gentle slope.
My NH TC29D does the same

 

[RogerDL]

My 424 will roll a little on a gentle slope. It is kind of jerky when it rolls, as the fluid must be working its way through the hydro. Usually having the loader down is enough to stop it, unless the hill is pretty steep then I set the brake.

 

[YanmarGuy]

My 424 will roll a little on a gentle slope. It is kind of jerky when it rolls, as the fluid must be working its way through the hydro. Usually having the loader down is enough to stop it, unless the hill is pretty steep then I set the brake.

I worked on stump grinding today with my Baumalight 1p24. It was on a slight slope. I had to have the front pointed up hill so the chips wouldn’t hit a building. I had to be very conscious about roll back. I would feather the fwd pedal to keep from losing my progress and the back of the cutting wheel from contacting the stump. Dealer said he didn’t “think” it should roll on a slight grade. He’s going to investigate.

 

[hodge]

Are you in high or low range?

 

[YanmarGuy]

Low but, it doesn’t matter. Hi/low gear or up/down rpm, it still rolls. Even on flat ground I can push it. I believe something is wrong. I’ve searched the web and haven’t seen this issue.

 

[RogerDL]

Low but, it doesn’t matter. Hi/low gear or up/down rpm, it still rolls. Even on flat ground I can push it. I believe something is wrong. I’ve searched the web and haven’t seen this issue.

If you can push it on flat ground that is very strange. Is that with the tractor running or shut off? I guess I can't remember exactly how mine rolls with it running, I was thinking when the tractor is shut off it will creep if it's on a hill. I should be at my campground this weekend where the tractor is, and I can see what it does when it's running, but I think it creeps about the same running or shut off. It is definitely not freewheeling.

 

[rScotty]

With your foot off the HST, the internal HST pump wobble plate should return to the neutral position. In that position the tractor shouldn't try to creep forward or reverse, but it will roll freely on a slope.
I agree that it would be nice if they didn't move at all unless the operator moves the HST control - but I don't know of any tractor that works like that.

 

[RogerDL]

I had mine running on a slight hill this weekend and it rolled some. Not nearly as easily as a gear drive tractor in neutral, but it does roll a bit of the brake is off or the loader isn't down. I think any tractor with a hydro does that.

 

[YanmarGuy]

Thanks guys. My buddy’s Kioti operates similarly. I’ll test the Kubota L3902 next.

 

[YanmarGuy]

FYI. I tried the Kubota L3902 and it creeps on a grade. I also talked to a guy with an SA425 and his creeps. The dealer adjusted the fwd/rev pedals. This stopped the rolling. All good now.

 

[MaxHeavier]

It sounds like your Yanmar SA325 is behaving normally for its type. Hydrostatic systems often allow some movement when the pedal is released, especially on slopes. The degree of roll can vary based on the tractor's design and whether it’s in high or low range. If you’re finding it excessive, you might want to check if there are any adjustments or upgrades recommended for better holding on slopes.

 

[careyo63]

My Yanmar has two throttles. A hand That you can set the Idle speed and a typical foot pedal that you can Increase, Decrease the Eng. speed. Release the foot pedal and it lowers back to the Idle setting you have it set at. If your having to use a lot of Eng RPM. to keep it from drifting back then that could be a sign of a problem. I would be asking the dealer etc. if it needed to be addressed or a problem then. High RPMs and rolling back is pretty much a sign the Trans. is slipping or a problem. JMO..