Wheelhorse#1 1,867 #1 Posted October 11 (edited) I have a sunstand 90-2019 on a 1973 12 auto that has a leaking seal right where the cam follower block is Is it possible to replace without removing the whole pump ? thx Edited October 13 by Wheelhorse#1 Share this post Link to post Share on other sites
ebinmaine 74,509 #2 Posted October 11 1 minute ago, Wheelhorse#1 said: 1975 12 auto Should be a 1973. '75 was a C series. @pfrederi might be able to help with the seal info. Share this post Link to post Share on other sites
squonk 44,582 #3 Posted October 11 You can leave the pump in. Get some long bolts and replace the ones that hold the trans to the frame. Then you can roll it way and work on it then roll it back and it's lined up. Don't forget to support the trans and the tractor frame! 2 1 Share this post Link to post Share on other sites
pfrederi 18,966 #4 Posted October 12 You will need a 12pt 1/4" socket. PM me you address i will give you the 2 O rings you will need. Your 1973 Hydrogear Sunstrand is slightly different from the one on Squonks post and uses two O rings. #52 and #55 in the picture. 3 1 Share this post Link to post Share on other sites
squonk 44,582 #5 Posted October 12 7mm 12 pt socket will work in place of the 1/4" 2 Share this post Link to post Share on other sites
Wheelhorse#1 1,867 #6 Posted October 12 On 10/11/2025 at 4:46 PM, ebinmaine said: Should be a 1973. '75 was a C series. @pfrederi might be able to help with the seal info. Correct 73 sorry ,I get them mixed up sometimes. Share this post Link to post Share on other sites
Wheelhorse#1 1,867 #7 Posted October 12 11 hours ago, pfrederi said: You will need a 12pt 1/4" socket. PM me you address i will give you the 2 O rings you will need. Your 1973 Hydrogear Sunstrand is slightly different from the one on Squonks post and uses two O rings. #52 and #55 in the picture. Thank you ,very helpful.The leak has gotten pretty bad and since this is my plow tractor I need to get it right . Pm sent Share this post Link to post Share on other sites
Wheelhorse#1 1,867 #8 Posted October 12 (edited) Folks ,Thanks for all the help. This machine originally had the motion control in the center of the console,didn’t like that so switched it to the side motion controller,much better so I’m familiar with pulling all this back out again, wasn’t fun but not to difficult to do just tight quarters in there . Wish I had thought to check those rings wileI was in there a couple yrs ago Edited October 12 by Wheelhorse#1 Share this post Link to post Share on other sites
mrc 999 #9 Posted October 13 Wheelhorse#1, i just did this job this past summer on my bronco 14. pfrederi was kind enough to send me the seals. i like squonks idea. i supported the tractor on jackstands. then unbolted the tranny and rolled it backward. then changed the seals and reassembled. no leaks 1 Share this post Link to post Share on other sites
Wheelhorse#1 1,867 #10 Posted October 13 @mrc Thanks yes I’m getting ready start on disassembly but going to pick up longer bolts for the tranny. Never would have thought of that, so many helpful folks here well worth the price of admission and more . thx 3 Share this post Link to post Share on other sites
