BX-Wheels will not spin-Normal?
- Thread starter Mike_Lipke
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RayH
Banned
Im puzzled that your engine bogs with an HST. Maybe the BX is different than the larger tractors. Even if I leave the throttle at idle in high range, my engine wont bog, I just wont have enough power to do anything before the tractor just wont move.
Volfandt
Veteran Member
The engine will bog down. I'll lose RPM and it will start smoking (lugging) alittle also.
The HST is not like an automatic tranny in an automobile. Theres no torque converter in a tractor to act like a "clutch" to separate the load form the engine.
In an HST, the more you depress the pedal or move the HST hand control in a certain direction, the more the swash plate's angle of attack changes which applies more hydraulic pressure to the hydro motor. When this pressure can't overcome the drive wheels inertia, due to an obstruction or whatever is preventing the wheels from turnng, is when it can bog or lug an engine down.
Neutral is achieved by the swash plate's angle of attack not applying any hydraulic power to the hydro motor.
That how it is in the vast majority of tractors, there may be exceptions or modifications but that is the basic principle of the HST in tractors & L&G tractors.
I've also bogged/lugged the engine down when overloading the FEL and BH, and also when trying to mow to low in high grass.
All in all I have learned to avoid lugging/bogging by working within the BX23's design limits and it works very good for me when I do.
Volfandt
The HST is not like an automatic tranny in an automobile. Theres no torque converter in a tractor to act like a "clutch" to separate the load form the engine.
In an HST, the more you depress the pedal or move the HST hand control in a certain direction, the more the swash plate's angle of attack changes which applies more hydraulic pressure to the hydro motor. When this pressure can't overcome the drive wheels inertia, due to an obstruction or whatever is preventing the wheels from turnng, is when it can bog or lug an engine down.
Neutral is achieved by the swash plate's angle of attack not applying any hydraulic power to the hydro motor.
That how it is in the vast majority of tractors, there may be exceptions or modifications but that is the basic principle of the HST in tractors & L&G tractors.
I've also bogged/lugged the engine down when overloading the FEL and BH, and also when trying to mow to low in high grass.
All in all I have learned to avoid lugging/bogging by working within the BX23's design limits and it works very good for me when I do.
Volfandt
OP
Mike_Lipke
Silver Member
- Joined
- Oct 25, 2005
- Messages
- 205
- Tractor
- Kubota BX1500
Final Post ( I think).
Used tractor again this weekend. At first, same issue, not much hook-up between that 15 ponies and the wheels. Then I thought, what the He**.
Put bucket against a big oak, rev'd her up all the way and tried to push in low range.
At first, nothing.
Then, about 20 seconds into this, two wheels started to turn in the gravel-one front and one rear. Pushed on the diff-lock pedal. Now one front wheel and two rear wheels are digging holes in the gravel, and engine starts to lose rpm a little. This seems to be normal to me. A day later, it stll all works like I think it should. In other words, as soon as the tractor cannot move, wheels spin immediately and engine sounds like it is loading down.
What I think happened is a piece of something lodged in the relief valve, bleeding off hydraulic pressure. My torture test opened the valve wide enough for the chunk of whatever to dislodge. Now the valve only opens when pressure gets too high, the way it was designed. All is well, Kubota is great, Allah is great, Diesel is the man, God is good and BX1500 is the best thing since canned beer.
Used tractor again this weekend. At first, same issue, not much hook-up between that 15 ponies and the wheels. Then I thought, what the He**.
Put bucket against a big oak, rev'd her up all the way and tried to push in low range.
At first, nothing.
Then, about 20 seconds into this, two wheels started to turn in the gravel-one front and one rear. Pushed on the diff-lock pedal. Now one front wheel and two rear wheels are digging holes in the gravel, and engine starts to lose rpm a little. This seems to be normal to me. A day later, it stll all works like I think it should. In other words, as soon as the tractor cannot move, wheels spin immediately and engine sounds like it is loading down.
What I think happened is a piece of something lodged in the relief valve, bleeding off hydraulic pressure. My torture test opened the valve wide enough for the chunk of whatever to dislodge. Now the valve only opens when pressure gets too high, the way it was designed. All is well, Kubota is great, Allah is great, Diesel is the man, God is good and BX1500 is the best thing since canned beer.
Volfandt
Veteran Member
Congrats, good to hear it's working now.
I haven't read back through the entire thread but if you haven't changed the HST fluid & filter I'd recommend doing so. I'd recommend useing super UDT. Theres also a filter screen located on the main HST return line located on the left side of the HST down near the bottom. You can get to it without pulling the wheel but you've got to have the fluid drained before you remove it. Whatever may be loose in your hydraulic system will eventually end up in it.
Volfandt
I haven't read back through the entire thread but if you haven't changed the HST fluid & filter I'd recommend doing so. I'd recommend useing super UDT. Theres also a filter screen located on the main HST return line located on the left side of the HST down near the bottom. You can get to it without pulling the wheel but you've got to have the fluid drained before you remove it. Whatever may be loose in your hydraulic system will eventually end up in it.
Volfandt
HomeBrew2
Banned
Good deal /forums/images/graemlins/grin.gif
Cheers!
Cheers!
RayH
Banned
I know this thread is old news but I have an update.
My BX23 doesnt seem to spin wheels in 4X4 at 3/4 throttle with the BH on, on hard packed dirt. At full throttle or with the BH off, it will barely spin two wheels. It still doesnt seem to bog at anything above 3/4 throttle. It does drop a few RPMs but doesnt bellow black smoke or act like it wants to stall.
My BX23 doesnt seem to spin wheels in 4X4 at 3/4 throttle with the BH on, on hard packed dirt. At full throttle or with the BH off, it will barely spin two wheels. It still doesnt seem to bog at anything above 3/4 throttle. It does drop a few RPMs but doesnt bellow black smoke or act like it wants to stall.