Jump to content

Unofficial Home of Old Simplicity & Allis-Chalmers Garden Tractors

  • Announcements

    • Kent

      Sign In or Password Problems?   10/09/2016

      If you can't Sign In, you need to reset your password.  Use the Forgot Your Password link at the bottom of the Sign In screen, and the site will send you an email to reset it. If you have an AOL email account, use the Contact Us link at the bottom of the screen -- AOL is intermittently blocking email from the site.
    • Kent

      Feedback Please!   10/28/2017

      See News and Announcements forum.
620Doc

AC 620 Drive Clutch ,Front Axle and More Questions

Recommended Posts

620Doc
I have the motor out of my 620 to repair the starter. I have been following the "Kicking around engine ideas for the 4040" thread below. In a post by D-17 Dave on 01/04/09, he suggested inspecting the clutch drive bearings. It does seem to make some noise when the clutch is engaged and quiets when the clutch is disengaged. My question is, is there a way to inspect the bearings or should they just be replaced? Same question with the drive belts. He also mentioned "tightening up the front axle." I'm interested in what to look for and how to tighten it up. I must add that this site has been an outstanding resource for me. It has helped me immensely in keeping my old Allis-Chalmers in running order. Thank you in advance, gentlemen, for your kind help.

Share this post


Link to post
Share on other sites
richp
What A lot of guys do, including myself, is to weld some plates behind the front axle. This will keep it from pivoting from front to back when you move the wheel. I think I welded 1/4" plates on my last Powermax. On the front PTO, I would think the bearing would make most noise when disengaged. On the machines I had, both had worn bearings on the pto clutch.

Share this post


Link to post
Share on other sites
wilm169
The foot clutch bearings there are 2 of them in the cast mounting, I have had good luck in just taking the nut off and taping them out toward the back of the tractor. Some need to be taken to a press to get out, so watch the shims if you unbolt it to take it out of the tractor to press. The are nothing more than lawn mower arbor bearings.

Share this post


Link to post
Share on other sites
D-17_Dave
The bearing on the clutch only spins when the clutch is dis-engaged. ie, the crankshaft turns but the pulley does not. An old, dry bearing will make a lot of noise say when you have no belt on the clutch and shut the engine off, the pulley will free wheel till it looses it's momentum and you will here the noise very prevalent without the engine running then. Most of the time you don't realise how worn and noisy they are till they are replaced. You need to pay attention to the same bearing in the rear pto if so equipped and as Levi mentioned, the clutch bearings. The front axle pivot bushings wear and let the front axle flop around. The torque from the drag link pushing forward and backward doesn't help either. The best thing to do is to fix the bushings properly first. Replacing the bushings and pivot bolts will help a lot but will not likely last very long as the pivots were too close together to start with. Small design flaw. What most do is after repairing the bushings is to weld a couple of 1/4" plates a few inches long inside of the frame channel where the axle rests. When you place the axle back into the tractor be sure to shim the bushings to match the new plates and tighten the pivot bolts and lock them. This will last a long time and not allow all the load of the front axle to be put solely on the bushings.

Share this post


Link to post
Share on other sites
620Doc
Thank you D-17 Dave. I have to say that, after several years of watching you give input on matters such as this, you are probably considered the ABSOLUTE WORLD EXPERT for advise on large frame Allis-Chalmers/Simplicity tractors. Keep up the great work.

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


×