mcratchet1 5 Posted January 8 Share Posted January 8 2007 Mack mr688s gearbox is leaking around shaft area. My question is how bad of a job would resealing it be? Instead of buying a reman for $1200 mack part# 8148592SV5R or does anyone have a rebuild manual on gearbox any help would be greatly appreciated Quote Link to post Share on other sites
Mackpro 429 Posted January 8 Share Posted January 8 RH Sheppard has all their manuals on the website. I use it a lot . TRW used to have their manuals online but haven’t checked it a while. First thing would be to figure out which brand then which model gear box you have . Quote Link to post Share on other sites
Joey Mack 392 Posted January 9 Share Posted January 9 Is it leaking at the input shaft or the sector shaft? If at the Sector shaft, your done... new box.. There are seal kits for the input shaft, these kits are for several versions, so there will be some leftover parts.. the Mack dealers are proud of these kits.. I have bought them at private truck parts suppliers for less than $50.00.... if it's the input shaft, before you open the seal repair kit,(not returnable).. pull the seal out of the steering box and see if there is a groove on the input shaft at the seal lip line.... if so..... get a new box.... Ok "V" and "F"... you're turn... Jojo 2 Quote Link to post Share on other sites
Vmac3 95 Posted January 9 Share Posted January 9 I have rebuilt these boxes because of the the sector shaft leaking. In the end it's not worth it. After replacing the sector shaft and resealing the box add labor it doesn't make sense. If the inputshaft has a groove, then the box is toast. Sorry, i wish I had another idea, but as JOJO said it, you are better off with another box. 1 Quote Link to post Share on other sites
Joey Mack 392 Posted January 9 Share Posted January 9 Bingo!!! Thanks "V" 1 Quote Link to post Share on other sites
mcratchet1 5 Posted January 11 Author Share Posted January 11 Ok thanks for the information I think I’ll just get the reman and be done with it. 1 Quote Link to post Share on other sites
mcratchet1 5 Posted January 31 Author Share Posted January 31 Reman gear has 2 marks but old one only had one and pitman arm only has one! It’s Sunday everything is closed would anyone know the answer please? Which make do I align Quote Link to post Share on other sites
Joey Mack 392 Posted January 31 Share Posted January 31 The small arrow is the manufactuerer mark, the other is someone's scribe... the small one is it... Quote Link to post Share on other sites
Joey Mack 392 Posted January 31 Share Posted January 31 I'm surprised the re-man center, didnt grind the wrong one off... Quote Link to post Share on other sites
mcratchet1 5 Posted January 31 Author Share Posted January 31 Ok that means I would have to turn heat pump 180 degrees to align is that ok Quote Link to post Share on other sites
mcratchet1 5 Posted January 31 Author Share Posted January 31 So turn it to that small arrow right Quote Link to post Share on other sites
mcratchet1 5 Posted January 31 Author Share Posted January 31 The pump will not turn enough to align must be the big arrow Quote Link to post Share on other sites
Joey Mack 392 Posted January 31 Share Posted January 31 Ok,, this is a new one for me, when its installed on the truck, align the big arrow to the pitman arm, jack up the front end and turn the wheel all the way both ways and check the range of movement.(engine off)... i'm not sure how it could be off 180 degrees, the sector shaft is only a 1/4 round gear, driven by the input shaft (worm gear)... someone here may have been through this, hopefully they chime in.. When you do get it right, you may have to set the plungers to get the best out of the steering, we will get to that later. Jojo Quote Link to post Share on other sites
Mark T 82 Posted January 31 Share Posted January 31 If he moved it that much already, I don't think the autostops are gonna be much good. Quote Link to post Share on other sites
Joey Mack 392 Posted February 1 Share Posted February 1 that sucks.... Quote Link to post Share on other sites
Mark T 82 Posted February 1 Share Posted February 1 They'll work, just need to be reset. Quote Link to post Share on other sites
mcratchet1 5 Posted February 1 Author Share Posted February 1 Ok thanks for help guys, the scribe arrow was right. Thought that was strange but it worked. Installed, bleed air out and she steers perfect thanks again!! 1 Quote Link to post Share on other sites
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