White 2-105 Brake Valve Seals

[DanielW]

Hi folks,

We've had a problem with our 2-105 for a few years now, where the hydraulic flow from the remotes is (very) significantly reduced if you happen to be operating the brakes while using the remotes. It's rather irksome, as we use this tractor for round baling, and most of our fields are on hills; You almost always want to instinctively be braking while you open the gate, but if you do so the gate will shudder and open very, very slowly from lack of flow.

Because we now only do about 120 round bales a year, it hasn't been at the top of my priority list to fix. But it's getting to the point where I'd like to look at it soon. I suspect a bypass/leaking piston in the brake valve. Looking at the AGCO parts books, it looks like the seals on the brake pistons are just SAE #119 O-rings (with #112 O-Rings for the spool where it exits the valve body and a gasket for the end cap). I'm thus hoping it's pretty easy to re-seal these, and I'm not surprised that this would be an issue, since I had to re-seal the compensator and priority valve spools last year.

But I thought I'd ask here first in case anyone has any other thoughts/advice. I also confess that I haven't looked into how easy/hard a job it is to access/remove the brake valve, so any advice on that is greatly appreciated. We've only had this tractor for about 5 years, and because it only gets used a few hours each year (and because I confess we all hate using this tractor) I really don't pay much attention to it and haven't learned its mechanical 'ins and outs' like I have any of our other tractors.

Any thoughts/advice greatly appreciated.

Daniel

 

[tom upton]

Daniel: Never had any issues with the brakes on mine so cant help you there, but I am thinking if you hate using this tractor it probably has a cab on it?? I took cab off mine and put some 4 digit Oliver fenders on it, Its like a whole different machine. Probably my second favorite tractor to operate now. (1655 is my favorite)

 

[DanielW]

You nailed it Tom: It has the (awful) cab. (though I'm not nor fan of the control layout nor Vickers pump either).

 

[mkuhns]

Hi folks,

We've had a problem with our 2-105 for a few years now, where the hydraulic flow from the remotes is (very) significantly reduced if you happen to be operating the brakes while using the remotes. It's rather irksome, as we use this tractor for round baling, and most of our fields are on hills; You almost always want to instinctively be braking while you open the gate, but if you do so the gate will shudder and open very, very slowly from lack of flow.

Because we now only do about 120 round bales a year, it hasn't been at the top of my priority list to fix. But it's getting to the point where I'd like to look at it soon. I suspect a bypass/leaking piston in the brake valve. Looking at the AGCO parts books, it looks like the seals on the brake pistons are just SAE #119 O-rings (with #112 O-Rings for the spool where it exits the valve body and a gasket for the end cap). I'm thus hoping it's pretty easy to re-seal these, and I'm not surprised that this would be an issue, since I had to re-seal the compensator and priority valve spools last year.

But I thought I'd ask here first in case anyone has any other thoughts/advice. I also confess that I haven't looked into how easy/hard a job it is to access/remove the brake valve, so any advice on that is greatly appreciated. We've only had this tractor for about 5 years, and because it only gets used a few hours each year (and because I confess we all hate using this tractor) I really don't pay much attention to it and haven't learned its mechanical 'ins and outs' like I have any of our other tractors.

Any thoughts/advice greatly appreciated.

Daniel

I would think you have a priority / flow control valve issue. The brakes and pto use a pressure reducing valve under the hydraulic pump to drop pressure to about 180 - 210 psi. Rest of the tractor operates on normal hydraulic pump pressure around 2500 psi. Sheetmetal and fuel tank would need removed to access the brake valve. It's located on the front side of the brake pedals on the front side of the dash. Never had any brake valve issues on all the tractors that had that valve on.

 

[DanielW]

Ah, good point. That might explain our troublesome brake action if the reducing valve is acting up or bypassing: One of the aspects I dislike about this tractor is how 'touchy' the brakes are: Just a slight bit of pressure on the brakes will lock the wheels up. I never took apart the reducing valve when I replaced the o-rings and cleaned up the compensator and relief valves: I initially intended to pull the whole valve body off and go over it properly, but (like all things when haying) I was in a rush, and replacing the seals and shimming/adjusting the relief valve back up to its proper pressure fixed the issues at the time, so I left it at that and never got around to going over the whole valve body properly.