Hydrostat and braking

[Rotro]

On my 2018 1736, any hill that I brake to stop on, trying to go backwards always results in rolling forward until the brake is fully released. It's done this since day one. Doesn't matter how rev'd up I have it, the brake releases either too soon or the hydrostat doesn't engage soon enough. This weekend I grew sick of the problem after I wiped out a 4x4 post on the chicken coop trying to go backwards after dumping some feedbags.

I called the service dept and the tech isn't sure. He couldn't find any reason in the parts diagram why the hydrostat would ever be disengaged. He suspected there's a switch somewhere that disengages the hydrostat with the park brake lever but he doesn't see it.

A few moments ago, I thought about separating the brake pedals and only using left or right to see if that would at least bypass the problem. Haven't tried it yet. Perhaps that is how I am suppose to deal with hills.

Does anyone know what I am talking about and is there anything that needs fixing? I don't care if the hydrostat is always engaged as long as that means I won't roll down the hill a few feet before the hydrostat engages.

 

[Rotro]

Grok says the linkage off the pedal that goes to the floorboard activates a "neutral switch" and it's out of adjustment... going to go see if that's what's going on...

 

[Eagle1]

Hold brake, step on reverse it will start to move and release brake..... works for me. Little harder with the BX where brake and HST are on the same side. Normally us the loader to hold until it starts to move. Only an issue on steeper grades, I have plenty.

 

[Rotro]

Yeah that doesn't work for me. I can hold reverse all the way down reving the tractor and once enough brake is released, the tractor rolls until I have the brake pedal all the way out... then it jerks backward.

I think I see two microswitches behind the dash for the l/r brake pedal that probably are my problem, I just don't know if they can be adjusted yet if they are.

 

[Rotro]

My thought at the moment is that these switches suppose to be activated when the brakes are fully in, but whoever stuck them in had them activated until the brakes are fully out... just opposite of what they should be. I'm still researching.

 

[Rotro]

Took the dash off and figured out what's going on. Those two microswitches I saw earlier are only activated at the end of brake peddle retracted. If I try to adjust them to activate anywhere off parking, the arms will bend. It's almost as if they are the wrong switches or they are reversed and wired backwards.

As proof these things are my problem, I taped one always activated and this is my problem. Worked just like I think it should on a hill.

I'll study this some more but the only way I see to fix it to where these particular switches work correctly only in the parking brake position, is to get out my grinder. Surely that isn't the answer.

At this point, I am thinking of bypassing them and not have the hydrostat disengage ever. I don't know if I'll really ever need that.