CASE 580C backhoe shuttle shift forward is weak, reverse is fine

   / CASE 580C backhoe shuttle shift forward is weak, reverse is fine #1  

1adam

New member
Joined
Sep 2, 2025
Messages
2
Tractor
580c
Hello
Have a 76 or 77 CASE 580C backhoe that just had the Borg Warner shuttle rebuilt with new torque converter and basically has the same issue coming right back at me--
The forward power is weak, reverse is fine-- I now have better than minimum pressures, stall tests still check out as do converter tests too.
I had similar numbers just below minimums before the rebuild with the exception of the test for the converter---I figured that was the issue and since I had it out I would do a full rebuild.
In the rebuild I found no issues--no burn smell, no debris, no warped plates, no seals with holes rips or tears.
I even had 2 old timer mechanics who worked at CASE when these machines were their main bread and butter guiding me thru this.
I found that pushing up on the shuttle shifter helped it a little--very little --but in 1st it let me push stone. (noticed this long ago and assumed it was the seals)
I then checked to see if the linkages were allowing the valve to move all the way---and it was metal to metal
I then took off the cutout solenoid and took off the shift linkage on the metal arm at the end of the valve shaft.
I walked over the grinder and took about 1/8" off the forward side so it would move farther forward.
I put it all back together----and it now works better than ever, I can be in first gear run into stone pile, spin tires get a full bucket loaded, shift to 3rd and off I go. it even starts off in 4th and can go up a small hill and down the road like a rocket death trap on wheels----
It has not had this much power ever--my dad bought it over 20 years ago to fix tile blow outs---which it did and still does perfectly.

Question--
-What is worn or broke to cause this issue that needed me to GRIND it to fix it?
 
   / CASE 580C backhoe shuttle shift forward is weak, reverse is fine #2  
Could be the linkage was worn.
 
   / CASE 580C backhoe shuttle shift forward is weak, reverse is fine #3  
Welcome to TBN!

Did you replace all of the springs in the shuttle spool assembly? I'm thinking you may have an old, weak spring on the forward side that caused it not to shift the spool all the way.
 
   / CASE 580C backhoe shuttle shift forward is weak, reverse is fine #4  
I then took off the cutout solenoid and took off the shift linkage on the metal arm at the end of the valve shaft.
I walked over the grinder and took about 1/8" off the forward side so it would move farther forward.
I put it all back together----and it now works better than ever,
It has not had this much power ever--my dad bought it over 20 years ago to fix tile blow outs---which it did and still does perfectly.

Question--
-What is worn or broke to cause this issue that needed me to GRIND it to fix it?
Well, since it hasn't worked this well for over 20 years, maybe it was cast wrong from the start. Or, is there a linkage adjustment that had 1/8" turned back?
 

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