Case 580B Transaxle / Differential Rebuild

[580Bhoe]

Rebuilding my 1975 Case 580B Transaxle and Differential and could use some help / clarification during the process. I have the shop manual, I'm partially through the process, and I have some questions as I go along.


Here's some back ground and pictures of the original damage.

https://www.heavyequipmentforums.com/threads/case-580b-backhoe-transaxle-gear-destruction.124219/

Currently j have the Differential /ring gear out, I have the new parts, and I'm starting the "Adjustments" process. Based on the instructions I'm trying to set the side gear to spider gear backlash. It calls for "0.05" to 0.15" of backlash per the manual, is this supposed to be measured on each spider gear as I'm getting different backlash measurements on each spider gear VS side gear and it also changes as I rotate the spider gear around.. So I've labeled each spider gear 1, 2, & 3, and I've taken measurements from each 1/3 of the spider gear. So on the right side gear with a 2.66mm/0.104" (A39009) spacer washer I'm getting the following:

Right side gear to spider gear backlash in thousandths with a 2.66mm/0.104" (A39009) steel shim.
Spider #1) 18 -20- 22 thousandths as you
Spider #2) 0-2-4 thousandths
Spider #3) 15-18-25 thousandths


Brand New Left side gear to spider gear backlash in thousandths with a 2.66mm steel shim.
(Due to the spider gears being recessed it was harder to hold the spider so I only got I mesurement on each spider)
Spider #1) 18 -20- thousandths
Spider #2) 1-2 thousandths
Spider #3) 25 thousandths


Per the book if the measurements are different, your suppose togo off the smallest one, which would be spider #2.




Based on this if I went up to the next thickest steel shim a 2.78mm/0.109 (A39010) it would give me 3.5 to 7.5 thousandths total backlash on the right side BUT it would push out spider #3 backlash to 28.5 thousandths on the high side. Is this an acceptable clearance or is it too large?

If this is still not enough backlash on spider #2 the next size up is 3.04mm/0.119" (A39011) which would push it out a total of 10.5 thousandths for backlash on #2 of 10.5 to 14.5 thousandths BUT on spider #3 the backlash would be 25.5 to 35.5 thousandths. I'm thinking the 3.04mm/0.119" washer is too large and will push out the backlash too far on spider #3 at 25.5 to 35.5 thousandths?

If the 3.04mm /0.119" washer is too big, what's the best option; going to the next thicker 2.77mm/0.109 steel shim even though the high side on spider #3 will be 28.5 thousandths ...OR is is better to keep #2 at 0-4 thousandths and #3 at 25 thousandths with the current 2.66mm/0.104" washer?


Thanks

 

[580Bhoe]

@alrman .....do you know whats the better way to set this up?

Thanks

 

[580Bhoe]

So to summarize my question:

Is it better to use the current shim (2.66mm/ 0.104") and be at basically 0-3 thousandths lash on the tigest spider gear and 25 thousandths on the loosest spider gear.

OR

Is it better to go one shim thicker to 2.78mm / 0.109" and be 3.5 to 5.5 thousandths lash on the tigest spider gear and 28.5 thousandths lash on the loosest spider gear?


Thanks

 

[alrman]

First thing I would do is find why there is a huge difference.
Something is worn.
Often the shafts that the spider gears run on are the cause, sometimes the gears are worn as well.