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JD 301A Brake failure


 
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Johnleslie
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Joined: 01 Jul 2018
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PostPosted: Sat May 09, 2020 10:56 am    Post subject: JD 301A Brake failure Reply to specific post Reply with quote

I have a JD 301A industrial tractor and the brakes completely went out. Pedals went to the floor.
The pistons on the brake valve body are stuck in.
Did the bleeding procedure as the manuals prescribed, but nothing
I am understanding that brake oil is derived from the main hydraulic system and is not isolated to its own.
I cant see where the oil comes in. Is it coming in from the valve body next to the brakes (reverser and clutch)
Seems with both pistons stuck in, there is an issue with the fluid coming in to the brake system. Am I sniffing up the right tree here?
 
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matthies
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PostPosted: Sat May 09, 2020 7:29 pm    Post subject: Re: JD 301A Brake failure Reply to specific post Reply with quote

The oil the brakes use is return oil from other functions, and being the low spot in the system the valve collects a lot of sediment. I've fixed quite a few with just cleaning the valve housing out. There are two plugs on top, two check valves internally under the first plugs you remove and then the lower plugs. Once the valve gets dirty enough the check valves don't shut allowing the brakes not to work. This in done on the machine, you don't have to remove the valve.
 
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Johnleslie
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PostPosted: Sat May 09, 2020 8:16 pm    Post subject: Re: JD 301A Brake failure Reply to specific post Reply with quote

Thanks for the tip. I will try that. Seemed like it was something upstream from the check valves as both of them stuck. I'll let you know how it goes. Thanks!
 
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matthies
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PostPosted: Sun May 10, 2020 9:25 am    Post subject: Re: JD 301A Brake failure Reply to specific post Reply with quote

With no restriction, the plungers traveled to far and got stuck.
 
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Roy Suomi
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PostPosted: Mon May 11, 2020 1:52 pm    Post subject: Re: JD 301A Brake failure Reply to specific post Reply with quote

On top of the brake valve where pedals are, there is a shallow , large steel plug on the top of the reservoir. Take the plug out and look inside the reservoir for oil level.. Should be nearly full. I've had to use a chisel to tap the plug loose upon occasion. fill if low and bleed the brakes. It should work now.. However , there is a reason the brake valve isn't filling by itself. There is a very small hole that fills the valve from the reverser. Might be plugged..
 
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