When I start to move the tractor begins to go then it surges as though the transmission just got a delayed flow of fluid? Especially noticeable when in third (high) range. Fluid levels are fine, and pedals seem to be properly adjusted. Anybody know what's causing this?
B3300SU Transmission Surge
- Thread starter Ralph B
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- kubota b3300su
JOHNTHOMAS
Super Member
- Joined
- Apr 14, 2008
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- Somerset, Ky
- Tractor
- F2690 4WD RTV X1140 MX5400 HST ZD1211
HST or geared? The HST has sensors or something that helps the driver by trying to match the demands on the tractor to the input of power on the HST models. Don't know that much about the geared since I only have one of them and don't use it much. I think the surge is common on the HST. Get on a flat paved road, no dips or hills, and set it at a constant speed with no change in throttle pressure and see if it does it. The slightest change in demand, hill up or down, will change it by increasing or like downshifted.
Verticaltrx
Veteran Member
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- Dec 30, 2009
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- VA
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- Kubota B3200/L2501/SVL65-2/U35-4, IH 454/656, Ford NAA, Case 1845C/480E/450C LGP
The B3300su is HST, and has no sensors on the transmission.
The surge is normal and shouldn't be worried about it. It is just the change in pressure in the pumps that is causing it. A little bit unrefined, but not a problem by any means.
mjw357
Platinum Member
Same here. I actually have come to anticipate it, when manuevering out of the barn for example. Just E-Z-does-it.
namesray
Platinum Member
just wondering, what type of terrein (hill/flat) you are on and what rpms are you using when this happens to you?
i have a b7800 (very simular to b3300su) and this has not been a problem for me for the 850+ hours i have used it. the only time it will do this for me is if it is cold and oil not fully warmed up, or in too high a gear for use, or to low rpms. i run my rpms at least 2300 almost all the time. maybe i just got lucky with my tractor too since a lot of others mentioned this in this thread. anyway just some info for thought.
You got lucky, my 2620 I had was smooth as silk yet my 3200 is jerky no matter what rpm it is at.
namesray
Platinum Member
you running the super udt fluid in the hyd. trans. with kubota filters? just wondering for my info.
I changed the fluid at 50 hrs and went with CaseIH Hy-tran fluid but I did not notice any difference. As for filters I stick with Kubota filters. Expensive yes but I consider them excellent quality.:thumbsup:
I use Super-UDT and Kubota filters and always have. The transmission lurch only happens when the Hydraulic fluid is not up to operating temperature. Then it's pretty much gone. I use Lo 60% Med 39% and Hi about 1% of the time. So. It's a none issue for me anyway.
namesray
Platinum Member
same with me. in fact i only notice the problem with my b7800 when i am pulling out of my shed first thing=usually not fully warmed up and/or i have it at low rpms just pulling out. it will do it once with in the first 5 feet i move it then that is it. anyother time it has happened to me is if i was transporting it in high range and i get lazy and try to take it up a hill i should have shifted to medium on. other then that i never have this surge problem. i run my rpms atleast 2300. gears= low=50% med=49% high=1%.
not sure, but does it have a two stage pump and it might be kicking between stages causing this surge or lurch forward?
namesray
Platinum Member
i actually just priced kubota filters against wix (napa) and to my surporise, the kubota filters were not any more expensive. some of napa's filters were a little more (not much), some of kubota's filters were more (not much). i priced all the filters, air, oil, hyd/trans, fuel. i am in the north east. maybe prices with competitors vary elsewhere??? i too will stick with the kubota filters.:thumbsup:
