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Hd4 crawler no forward movement

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Joined: 27 Aug 2021
Location: Mo
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    Posted: 27 Aug 2021 at 10:07pm
I have been using my Allis HD4 loader and all of a sudden I have no forward travel. Reverse still works great. Any ideas outside of it being something wrong in the forward pack?
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Joined: 12 Sep 2009
Location: Afton MN
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Coke-in-MN Quote  Post ReplyReply Direct Link To This Post Posted: 28 Aug 2021 at 1:00pm
Valve body on left side - had spring in my HD4 break which did not allow valve spool to move proper distance to open port . Found a spring in my stash of saved things - had to shorten it a couple coils to get proper length and it worked fine after 
Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wire nut Quote  Post ReplyReply Direct Link To This Post Posted: 28 Aug 2021 at 3:55pm
Thanks for your response. Do I merely remove caps/plug on bottom to drop the spools out? Also on the back of that valve body are 2 Allen screws and I am assuming those are test ports. If that is so, do you know how much pressure I should have at those ports?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wire nut Quote  Post ReplyReply Direct Link To This Post Posted: 01 Sep 2021 at 5:49pm
Since my last post, some progress has been made but I still have same issue so if anyone has any insight, I would appreciate it.
Thanks to Coke in MN, I did check control valve and found broken washer on relief. I made repairs on relief thinking maybe it was relieving and not building enough pressure but that was not the issue with no forward movement. In previous post I had ask about test pressures at control and I now have pressure readings as follows and if there are any contributing comments, please free.
Top test port, with throttle at run speed, on control valve reads about 210# in neutral and reverse but drops to 90# in forward with no movement but you can hear a slight engine load. The bottom test port reads about 90# in neutral and reverse but drops to 0 to 10# again no movement. I suspect I am losing the pressure at the forward pack in shuttle. If anyone has any comments to add or that might keep me from having to remove that shuttle, please feel free to give me any input you may have.
Thanks so much.
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