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Deutz-Allis 917H


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#1 VintageIronCollector ONLINE  

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Posted March 03, 2014 - 08:51 PM

Tractor goes in reverse but won't move forward. Anybody know what the problem could be?


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#2 superaben OFFLINE  

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Posted March 03, 2014 - 09:29 PM

Assuming a hydro.

 

Does it whine as it tries to go forwards or does it do nothing?  Does the lever feel mushy as if there is nothing behind but still connected, tight, or loose?

 

Ben W.


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#3 LTD OFFLINE  

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Posted March 04, 2014 - 09:04 AM

Sounds like the relief valve is stuck.


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#4 VintageIronCollector ONLINE  

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Posted March 04, 2014 - 03:24 PM

Assuming a hydro.

 

Does it whine as it tries to go forwards or does it do nothing?  Does the lever feel mushy as if there is nothing behind but still connected, tight, or loose?

 

Ben W.

Not sure I want to buy one and it has this problem.

 

Sounds like the relief valve is stuck.

Is this a easy/cheap fix or hard/expensive?



#5 LTD OFFLINE  

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Posted March 04, 2014 - 05:22 PM

Not sure I want to buy one and it has this problem.

 

Is this a easy/cheap fix or hard/expensive?

Might be able to fix it yourself. They are located on top of the hydro pump. Side by side. One for reverse travel and one for forward travel. They have little buttons sticking out of the top of them about 1/8 of an inch. If one is stuck down flush it could be your problem. Put some good penetrating oil on it and let it sit for a while. Start up the tractor and move the hydro lever back and forth. May pop it free. If not you will haveto pull the relief valve.


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#6 Talntedmrgreen OFFLINE  

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Posted March 05, 2014 - 07:30 AM

Trimmed a pic I found on the net...the red arrow on the left points to one of the relief valves in the up, or motion position.  The arrow on the right points to a relief valve that is NOT in the up, motion position.  This tractor would move in only one direction the way it sits (Dunno which direction, maybe someone can identify which valve is fwd and which is rev).  That's what you're lookin for.

 

reliefvalves.png


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#7 skunkhome OFFLINE  

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Posted March 05, 2014 - 09:00 AM

I agree with Mr Green and LTD that that is likely the issue, however calling these valves relief valves is a misnomer. There are two relief valves on the transmission and pump but those valves are actually check valves that also allow moving of the tractor short distances without engine power when the buttons are depressed by the latch. They are supposed to pop back up when the engine is started again however sometimes there is a bit of corrosion or trash around the buttons preventing them from returning to the run position. Most have had success freeing up by soaking with PB blaster and gently tapping with hammer and drift.




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