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John Deere 300 Hydraulics stop when hot


 
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jcaldwell
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PostPosted: Sun Sep 27, 2020 3:50 pm    Post subject: John Deere 300 Hydraulics stop when hot Reply to specific post Reply with quote

My JD 300 backhoe has stopped working when it gets warmed up. Hydraulics and transmission. When it cools off, everything works again. I've changed the filters, fluid, and cleaned the sump screen. Any idea whats causing it?
 
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Tx Jim
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PostPosted: Mon Sep 28, 2020 3:01 am    Post subject: Re: John Deere 300 Hydraulics stop when hot Reply to specific post Reply with quote


Welcome to YT
Since trans stops operating I'm going to guess that the low pressure trans pump circuit has an internal leak or worn trans pump. A very large high pressure internal could cause same problem. JD closed center hyd system such as your 300 has require "good diagnostics" to determine the problem. Check hyd filter relief valve(keys18-20) to be sure it's not stuck open. Check trans pump output by removing hyd filter cover with drain pan underneath then operate engine for 15 seconds to check pump output.

I also suggest to check temp of each external hyd component with a hand held laser thermometer.

Remember diagnostics-diagnostics- diagnostics Good Luck.


 
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jcaldwell
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PostPosted: Mon Sep 28, 2020 5:44 am    Post subject: Re: John Deere 300 Hydraulics stop when hot Reply to specific post Reply with quote

Will do. I know everything I touch in the hyd system gets very hot when I've used the hoe for awhile. The steering column will burn my leg if I touch it.
 
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Tx Jim
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PostPosted: Mon Sep 28, 2020 6:03 am    Post subject: Re: John Deere 300 Hydraulics stop when hot Reply to specific post Reply with quote


Steering column o-rings have a long history of leaking causing hyd oil to heat & cause hyds to get sluggish. I suggest to acquire a JIC female cap then next time you need to operate backhoe disconnect steering supply line install female cap on main hyd line then see if hyd's operate cooler/better.
 
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jcaldwell
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PostPosted: Fri Oct 02, 2020 9:06 am    Post subject: Re: John Deere 300 Hydraulics stop when hot Reply to specific post Reply with quote

just so I understand, this would cap off the power steering? See if I can operate without power steering and see if it corrects the heating issue?
 
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Tx Jim
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PostPosted: Fri Oct 02, 2020 9:20 am    Post subject: Re: John Deere 300 Hydraulics stop when hot Reply to specific post Reply with quote


Yes capping power steering supply line then operating hyd's is a diagnostic step aka process of elimination.
 
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buickanddeere
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PostPosted: Fri Oct 02, 2020 10:51 am    Post subject: Re: John Deere 300 Hydraulics stop when hot Reply to specific post Reply with quote


Also time to make certain that there is no oil returning to the tractor from the loader or backhoe . When no function is selected.
 
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