MACKS Posted November 6, 2021 Share Posted November 6, 2021 Hey,does anybody know what size the o rings are in the hi-low shift cylinder are,been all over and can’t find the right size? Quote Link to comment https://www.bigmacktrucks.com/topic/68677-12-speed-hi-low-shift-cylinder/ Share on other sites More sharing options...
MACKS Posted November 6, 2021 Author Share Posted November 6, 2021 So who has done this,where did u find o rings that fit? Quote Link to comment https://www.bigmacktrucks.com/topic/68677-12-speed-hi-low-shift-cylinder/#findComment-482530 Share on other sites More sharing options...
Macktech20 Posted November 7, 2021 Share Posted November 7, 2021 The only place you'll find that oring is from Mack, and it comes in a kit. I might be wrong because it's been along time, but the kit number is 207SH32 I think this is the correct oring kit for a 12 speed. Quote Link to comment https://www.bigmacktrucks.com/topic/68677-12-speed-hi-low-shift-cylinder/#findComment-482533 Share on other sites More sharing options...
Joey Mack Posted November 7, 2021 Share Posted November 7, 2021 how about taking the o-rings to youre local hydraulic cylinder shop and matching them up to some cylinder o-rings. my shop here in town has wall of orings, with what seems like standardized numbers.. just a thought, Volvo doesnt give a damn.... Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/68677-12-speed-hi-low-shift-cylinder/#findComment-482534 Share on other sites More sharing options...
mrsmackpaul Posted November 7, 2021 Share Posted November 7, 2021 Dunno the kit number, but for the few dollars it was I just get them from Mack Paul Quote Link to comment https://www.bigmacktrucks.com/topic/68677-12-speed-hi-low-shift-cylinder/#findComment-482536 Share on other sites More sharing options...
MACKS Posted November 7, 2021 Author Share Posted November 7, 2021 14 minutes ago, Macktech20 said: The only place you'll find that oring is from Mack, and it comes in a kit. I might be wrong because it's been along time, but the kit number is 207SH32 I think this is the correct oring kit for a 12 speed. Went to Mack today,no good.. Quote Link to comment https://www.bigmacktrucks.com/topic/68677-12-speed-hi-low-shift-cylinder/#findComment-482537 Share on other sites More sharing options...
Macktech20 Posted November 7, 2021 Share Posted November 7, 2021 Just now, MACKS said: Went to Mack today,no good.. I think Pai Makes a kit also. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68677-12-speed-hi-low-shift-cylinder/#findComment-482538 Share on other sites More sharing options...
MACKS Posted November 7, 2021 Author Share Posted November 7, 2021 11 minutes ago, Joey Mack said: how about taking the o-rings to youre local hydraulic cylinder shop and matching them up to some cylinder o-rings. my shop here in town has wall of orings, with what seems like standardized numbers.. just a thought, Volvo doesnt give a damn.... Jojo Yes will try that,thanks. Quote Link to comment https://www.bigmacktrucks.com/topic/68677-12-speed-hi-low-shift-cylinder/#findComment-482539 Share on other sites More sharing options...
Joey Mack Posted November 7, 2021 Share Posted November 7, 2021 another option is overdrive rebuilders... I think its a chain company name. but just call the Concord N.C. location, I bet they have e'm 704-782-5557, ask for Chance... jojo Quote Link to comment https://www.bigmacktrucks.com/topic/68677-12-speed-hi-low-shift-cylinder/#findComment-482540 Share on other sites More sharing options...
MACKS Posted November 7, 2021 Author Share Posted November 7, 2021 6 minutes ago, MACKS said: Went to Mack today,no good.. Thanks for the part number,gonna try our truck parts store Monday,they rebuild trannys there so they should have them.. 5 minutes ago, MACKS said: Yes will try that,thanks. Quote Link to comment https://www.bigmacktrucks.com/topic/68677-12-speed-hi-low-shift-cylinder/#findComment-482541 Share on other sites More sharing options...
MACKS Posted November 7, 2021 Author Share Posted November 7, 2021 4 minutes ago, Joey Mack said: another option is overdrive rebuilders... I think its a chain company name. but just call the Concord N.C. location, I bet they have e'm 704-782-5557, ask for Chance... jojo I googled that part number,lots of on line places have it,but I need them now..lol Quote Link to comment https://www.bigmacktrucks.com/topic/68677-12-speed-hi-low-shift-cylinder/#findComment-482542 Share on other sites More sharing options...
MACKS Posted November 7, 2021 Author Share Posted November 7, 2021 Thanks for the help guys,I should be able to track them down with that part number,maybe even back to Mack,I don’t think the guy knew what he was looking for..🤷♂️ Quote Link to comment https://www.bigmacktrucks.com/topic/68677-12-speed-hi-low-shift-cylinder/#findComment-482543 Share on other sites More sharing options...
MACKX Posted November 7, 2021 Share Posted November 7, 2021 Like Joey said local hydraulic shop or stop at your local Cat dealer and tell them to size it..... should be able to in the safe source catalog they have..... I got one of those kits not to awfully long ago from Pittsburgh Mack ...... maybe it was longer than I thought tho..... 😒 2 Quote Link to comment https://www.bigmacktrucks.com/topic/68677-12-speed-hi-low-shift-cylinder/#findComment-482545 Share on other sites More sharing options...
MACKS Posted November 7, 2021 Author Share Posted November 7, 2021 Found some suitable o rings,not exact,just a hair thicker but they worked,gonna order the kit on line for a back up,Thanks folks for the help.. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/68677-12-speed-hi-low-shift-cylinder/#findComment-482567 Share on other sites More sharing options...
Joey Mack Posted November 7, 2021 Share Posted November 7, 2021 👍 Quote Link to comment https://www.bigmacktrucks.com/topic/68677-12-speed-hi-low-shift-cylinder/#findComment-482568 Share on other sites More sharing options...
mrsmackpaul Posted November 8, 2021 Share Posted November 8, 2021 On 11/8/2021 at 5:25 AM, MACKS said: Found some suitable o rings,not exact,just a hair thicker but they worked,gonna order the kit on line for a back up,Thanks folks for the help.. It's been a while now since I rebuilt mine and I seam to recall now that you mention it that I couldn't get a close enough match with the O rings and they gave me grief so I went genuine, either way you'll probably okay as everything on mine was pretty worn out Paul Quote Link to comment https://www.bigmacktrucks.com/topic/68677-12-speed-hi-low-shift-cylinder/#findComment-482617 Share on other sites More sharing options...
MACKS Posted November 9, 2021 Author Share Posted November 9, 2021 4 hours ago, mrsmackpaul said: It's been a while now since I rebuilt mine and I seam to recall now that you mention it that I couldn't get a close enough match with the O rings and they gave me grief so I went genuine, either way you'll probably okay as everything on mine was pretty worn out Paul I ordered the kit and will install the correct o rings,it’s a simple job,might as well do it right.. Quote Link to comment https://www.bigmacktrucks.com/topic/68677-12-speed-hi-low-shift-cylinder/#findComment-482626 Share on other sites More sharing options...
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