Help with reverse acceleration IH125
 

Ok guys in an earlier thread, y’all helped me get my 125 to travel in reverse and determine that my relief valves aren’t malfunctioning. Brakes are adjusted per the manual, and linkage adjustment was performed per the manual. Linkage has been lubed with aerosol white lithium grease because that’s what I had on hand. With the tractor on jack stands, directional operation works, no binding in the control lever on the dash. Here’s the question:

I was moving dirt yesterday with my Brinly scrape blade turned 180° so I can back up and push the dirt. About half the time, I would move the control lever to 100% reverse and the tractor would begin to move, then accelerate in reverse to full reverse speed. It’s acting like the swashplate is lagging behind the linkage. Has anyone ever experienced this? Engine is stable at 100% throttle. No issues in forward, just reverse. What steps can I take to troubleshoot this?

sounds like the trunnion needs rebuilt,

Hydro filter partially plugged and needs replacement ??

:Huh:

New hydro filter and hydro oil.

Is the trunnion the part that’s connected to the swashplate? There is a round plate on the left side of the drive shaft tunnel that can be removed during adjustment, is that the trunnion?

No it is not, it is on the left side attached to pump, when you lubed it did you split the tractor?

Swap relieve valves and try

No I did not split the tractor when I sprayed the lube on the linkages.

I don’t think it’s the relief valves because if you back up to a tree, it will spin the tires in reverse when it’s behaving. If the relief valve was malfunctioning, it probably wouldn’t have enough hydraulic pressure to spin the tires. Right?

It is probably a issue with the trunnion or the linkage on the cam plate, mine does the same thing, Good thing I have others to use, till I find the time to fix it.

Here is a picture of the trunion setup. Where you see the springs in the
arm gets grooves worn in it from the spring assembly. That rectangular
box where the springs ride needs to be square at the edges. The springs
could be worn as well. You may need to shim the plate to the hydro housing
if it is sloppy. You might be able to do all that with the tractor in tact but
for what its worth. It won't take as long as you think to split the tractor and
check it out. Whole lot easier to work on the stuff on the bench. And you'll
learn lots of cool stuff as well.

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Excellent pictures West Valley, I appreciate that. Looks like I have a potential winter project on my hands…