Jump to content

Unofficial Home of Old Simplicity & Allis-Chalmers Garden Tractors

Sign in to follow this  

7116H Hydro Linkage Moves Hard

Recommended Posts


The arm that controls the forward and reverse speed of the hydro on the tractor is much harder to move than I would like. It takes a good amount of effort to get it to move, which makes controlling ground speed a bit on the jittery side.

I'm wondering if there's any go-to's that I should check, or if a good cleanup and greasing of the pivots/joints/linkage will do wonders?


Share this post

Link to post
Share on other sites

First thing I'd do is disconnect the rod from the front lever (under the tractor, inside the frame).

If the lever is hard to move, then it's the lever "bearing". If the lever moves easy, then it's something in the linkage at the rear.

Share this post

Link to post
Share on other sites

I took the linkage apart one piece at a time, and in the end found out that the spring connecting the shaft assembly to the whole roller assembly thing makes to really tough to move the hydro arm.

When I disconnect the spring, the arm moves super smooth. I'm guessing that maybe the spring was replaced at one point with an oversized one..?

I can't quite figure out was it's even for..

Share this post

Link to post
Share on other sites

There is supposed to be a horizontal spring from the pump control shaft to a bracket on the left side of the frame. I believe to give constant tension in the control cam so the pump doesn't surge or pulse. The spring is not very heavy and if your cam roller is in good condition (not much slop) you can probably get by without a spring.

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Sign in to follow this  

  • Who's Online (See full list)

    • Bear
    • TTDE419
    • CarlH
    • Sean72
    • BLT
    • Tom45
    • gwiseman
    • smalljob
  • Today's Birthdays

    1. Carchief
      (57 years old)
    2. Geoff
      (56 years old)
    3. mohrds
      (51 years old)
  • Recent Status Updates

    • SonOfCreepfeed


      Thinkin' about this old girl.

      · 2 replies
    • Dean McFadden

      Dean McFadden

      Good morning peeps! I’m always searching for helpful information with my AC collection. Hope to find out new information and pass on my own experience in restoration. Here are some pics of my babies. I’m still looking for front rims for the 410 so yesterday I put the 310 wheels on took it for a drive. Working pretty good but still needs some carb work. Gotta get the 310 running next. Have a great day!😁

      · 1 reply
  • Adverts