Backlash
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=27665
Printed Date: 21 Sep 2024 at 7:48pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Backlash
Posted By: Ted J
Subject: Backlash
Date Posted: 21 Mar 2011 at 8:05am
I see reference all the time to setting backlash in gears. What exactly is meant by backlash? Especially in reference to the belt pulley on a WD45. I haven't a clue as to how to set this.
-------------
"Allis-Express"
19?? WC / 1941 C / 1952 CA / 1956 WD45 / 1957 WD45 / 1958 D-17
|
Replies:
Posted By: Hurst
Date Posted: 21 Mar 2011 at 9:43am
If you were to put a torque on the gear in 1 direction so one side of the teeth on one gear are in contact with one side of the teeth on the other gear, then changed the torque so the opposite sides of the gear came into contact, that distance that the gear teeth traveled before contacting the opposite side is the gear backlash. You can measure it also by degrees of rotation or the change in length of a string wrapped around the shaft that a gear is attached to, just takes some geometry. This link should take you to a good picture that shows it:
http://%20en.wikipedia.org/wiki/File:Backlash.svg -
http://en.wikipedia.org/wiki/File:Backlash.svg - http://en.wikipedia.org/wiki/File:Backlash.svg
Hurst
-------------
1979 Allis Chalmers 7000
5800 Hours
|
Posted By: Ted J
Date Posted: 21 Mar 2011 at 12:00pm
OK Thanks, now I know what it is. How can you set the belt pulley so you don't have any? Do you feel it? Thanks
-------------
"Allis-Express"
19?? WC / 1941 C / 1952 CA / 1956 WD45 / 1957 WD45 / 1958 D-17
|
Posted By: CTuckerNWIL
Date Posted: 21 Mar 2011 at 12:47pm
You don't want to set gears with no backlash. The slightest amount of runout in either gear would add stress to the bearings carrying the assembly if the was no backlash. Yes you can feel the backlash.
There should be a number of blind holes drilled in the tube that contains the bearings and shaft connected to the pulley. Engage the gears and lock the set screw , check backlash. If it is too much turn to the next hole, continue this till you get the right amount of backlash and then, make a chisel mark on the housing to line up with the mark on the frame. Use the mark as a reference if you remove the shaft for loader work etc.
-------------
http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
|
Posted By: wfmurray
Date Posted: 21 Mar 2011 at 1:17pm
|
Rule of thums to tight it whines to loose it roars.
|
Posted By: Steve M C/IL
Date Posted: 21 Mar 2011 at 1:58pm
|
you should have a little clunk-clunk but not much.wfmurry gives good advise. Don't know the spec but .010 at the gear could be 1/8in at the outer dia of pulley.
|
Posted By: Brian Jasper co. Ia
Date Posted: 21 Mar 2011 at 5:11pm
Too tight and it will self destruct under load.
-------------
"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
|
|