BX2200 Hydro power? Slipping???

bxbuster · Oct 28, 2003

I have a general question regarding the amount of hydro slippage that is acceptable. Last week I was trying to push over an old clothes line post. I had the fel bucket about 3 feet up on the pole, put the tractor in low range and gave it a go. I expected one of two things to happen. The pole would be pushed up and out of the ground or the tractor would spin all four tires. Neither hapened. The tractor gave a great deal of push and started lugging down the engine but then the hydro started slipping. In my experience with other brands of tractors the hydro would not slip and the engine could be lugged to the point of killing it. Is there something wrong with my hydro or am I expecting too much from this tractor? Thanks for any responses. By the way, I have bar tires and it was running full throttle. Yes, the diff lock was applied. I'm not saying the tractor didn't have plenty of power and it did end up bending the post and removing it. I've also noticed when stabbing the fel into a heavy pile of dirt it slips vs. spinning the tires. Again, the tractor was in low gear. Thanks again for any responses.

jrlichina · Oct 28, 2003

The Kubota HST unit does have relief valves in both the forward and reverse circuits. These are to protect the unit from damage done by applying too much force on the input and output shafts and related components. Side note, are you sure none of the wheels were slipping and did you have the dif-lock engaged?

ges · Oct 28, 2003

Hi.....
Were you in high or low gear?
George

Hoosier_Daddy · Oct 28, 2003

Hey BX Buster.

I have the BX2200 and have never noticed the problem you have stated. Of course I have lawn tread tires and if I am in Low and 4 wheel and the Dif lock down and it spins I just try a different angle or method. However I can't say I have ever noticed slippage.

Hope you find your answer. It s a good little machine but it has it's limits. Sounds like you found one.

Good Luck,

Tom

bxbuster · Oct 29, 2003

I wonder if something has changed. Plugged filter etc. As I recall when the tractor was in its first year of service it seemed unstoppable in low range. All tires would spin. No one else can chime in on wether I should have tire spin or not? thanks again to all that have posted.

surfran · Oct 29, 2003

I have a BX1800 with turf tires, but I don't recall anything but engine bogging down (actually stalled it once, since I let off), or tire spinning on mine, I don't recall any trans slippage. I will of course pay more attention to that now, but don't expect to get into anything to find out until next spring/summer as Winter is barrelling down on us soon /forums/images/graemlins/frown.gif

sandyc · Oct 29, 2003

bxbuster
I have a 2200 and have moved a lot of earth and pulled trees and stumps. The wheels will spin even if the diff lock is engaged.
The hst is not an accelerator. If you push it to the floor you are in effect decresing the gear ratio. At least that is what I think I was told. Best thing I have found for pulling stumps is to start with the engine at about 2500 rpm or so, low range, and diff lock engaged, with my foot just at the first position of the hst (where it first engages).
You might want to check your fluid level and make sure it is full.
Best of luck

n3qik · Oct 29, 2003

While digging a trench for new water line. I had hydro slip many times, then some times nearly stall out engine. This using bar tires, 4WD, diff-locked, and in low. Like others have said it's the pressure relief valve.

Henro · Oct 30, 2003

I have a general question regarding the amount of hydro slippage that is acceptable. 

Good question.

I think the answer is no slip is acceptable

But I do not know for sure.

I do know that with my B2910 there is no perceptible slip...the engine dies if I do not let up on the directional pedal soon enough when I am digging into a pile of stuff with my loader and trying to do more than I should.

Is there a pressure relief valve on the bx2200 that is somehow tied into the HST system? I think someone in this thread said there was...again I do not know, but that would seem odd to me...viewing the bx2200 from the perspective of my B2910 experience.

I do not have a loader for my bx2200...but I sure would be disappointed if the tractor HST seemed to slip when worked hard. Like I said, my B2910 will stall but not slip... /forums/images/graemlins/blush.gif ...only stalled it a couple times though... /forums/images/graemlins/grin.gif...just enought to know for sure that what I am saying is accurate! /forums/images/graemlins/smile.gif

jrlichina · Oct 30, 2003

The HST unit and the system hydraulics are two separate systems, the only thing in common is that they share the same reservoir. The HST unit has relief valves for both the forward and backward circuits. These relief valves are completely separate from the system hydraulics relief valve. It is possible that they are set too low. You would have to hook up a pessure guage to the test port on the HST to see when(what pressure) it is bypassing. I don't remember the range on these relief valves off the top of my head, I can look it up when I get home.

art · Oct 30, 2003

I've never been able to stop the tire spin on one in low range as you stated. I do not know you exact situation but if not far from the dealer and you did or have maintained the filter I would put him in the circle here as you might have problem. The engine and drive train are covered for 3 years.

Dabota · Oct 31, 2003

I really think Sandyc hit this one dead on. Our tendency is to press the "accelerator" pedal (HST) harder if we aren't moving. All that does is shift to a higher gear and decrease the torque delivered to the wheels. At full engine RPM you should easily spin tires in low range throughout the first half of the pedal range.

Henro · Oct 31, 2003

The HST unit has relief valves for both the forward and backward circuits. These relief valves are completely separate from the system hydraulics relief valve. 

This would make sense. I was never aware [never really thought about it I guess] that there would be a relief valve in the hst circuit. Guess I just thought since there is not relief valve with a manual transmission...and stopped thinking at that point.

Are pressure relief valves common in all hst transmission set ups? Or is this just a feature of smaller tractors like the bx?

I know my B2910 will stall if I try to do more than I should. So if there is a PR valve it must be set pretty high. Totally different feeling than when I try to lift a heavy load and the loader pr valve kicks in...

JWE · Oct 31, 2003

I agree with Sandyc and Dabota on this one. My BX2200 is the first Hydro that I have owned and I have a hard time remembering to treat the hydro pedal as a speed control rather than a throttle. My tractor bogs down if I am pushing into a big pile and at the same time push the hydro pedal to the floor. If I leave-up on the pedal the engine RPMs pickup and the wheels start spinning.

John

frank_f15 · Oct 31, 2003

not sure what u mean by HYDRO SLIPPING but on my b2400 the tires will spin if i lose traction or the engine will lug, but never had a problem with the hst

JMP · Nov 2, 2003

Make sure your brakes aren't locked. Sounds dumb but I had the same problem when tring to push my model A into the shed. Was in low range, tires wouldn't spin and motor would bog. was ready to call the dealer when noticed the brake where locked on. (BX 2200)

rosey · Nov 2, 2003

I did not experience any 'slippage' while moving several tons of dirt this past summer with my loader (BX2200).......only wheel spin.

art · Nov 2, 2003

We have not done any repairs on the hydro units on these tractors and have easily over 300 of them out working. It was a good point on the hydro petal and using it as a gas petal as I often see that happening with owners.

bxbuster · Nov 11, 2003

After digesting all of the information received I put the tractor to some hard use last weekend and have determined that everything seems ok. I think when I was trying to remove the post from the ground I had the bucket up around 3 to 4 feet and this put and extreme amount of down pressure on the tires giving no chance for tire slippage. I think I started slow with the hydro pedal and when nothing happened I increased the pressure expecting the motor to lug until I could stall it out. This never happened. Instead it started lugging down, got to a point and stayed there. No matter how hard I pressed the pedal the engine rpm niether increased or decreased. As I started to say, last weekend I put it to some work and it no doubt had plenty of power to spin all four tires. I think with the post I had just reached a limitation in the hydro. Thanks for all of your posts! /forums/images/graemlins/laugh.gif

jrlichina · Nov 11, 2003

Henro

 Are pressure relief valves common in all hst transmission set ups? Or is this just a feature of smaller tractors like the bx?

Yes all HST units have relief valves as well as check valves in the forward and reverse circuits. Many combine them into one valve per circuit.