Moparmike Posted July 18 Share Posted July 18 Ok guys need some guidance on this had a trunnion replace in 1 of my other Mack dump trucks the shop that did it the owner passed so now it’s time to replace another in the Mack I have left I’ve ordered the trunnion should be here Monday any tips or tools you guys can tell me to assist in this I called around to get it done but everyone is at least a month out or more and 6/8 thousand dollars Ive owned and maintained trucks and equipment for almost 21 yrs I feel I’m over thinking it my plan is to get the front end on blocks get the back secured and cut it all out Left everything I can out with my excavator then jack the back up I also have to ream the holes out to 1 inch but like I said any tips or guidance will truly be appreciated Thank you Quote Link to comment https://www.bigmacktrucks.com/topic/75795-rd688-trunnion-replacement/ Share on other sites More sharing options...
terry Posted July 18 Share Posted July 18 Are you taking the dump box off? If it is a one piece trunnion then everything behind trunnion has to be removed to slide new one in. terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75795-rd688-trunnion-replacement/#findComment-579378 Share on other sites More sharing options...
Moparmike Posted July 18 Author Share Posted July 18 25 minutes ago, terry said: Are you taking the dump box off? If it is a one piece trunnion then everything behind trunnion has to be removed to slide new one in. terry No sir I bought the 1 you cut the old out and new comes in from top or bottom Quote Link to comment https://www.bigmacktrucks.com/topic/75795-rd688-trunnion-replacement/#findComment-579380 Share on other sites More sharing options...
Joey Mack Posted July 18 Share Posted July 18 ive never done one of those that drop in. I only ever had to remove the body and all thats behind the a-frame and roll it out with the rears as an assembly. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/75795-rd688-trunnion-replacement/#findComment-579381 Share on other sites More sharing options...
Popular Post D-Day Posted July 18 Popular Post Share Posted July 18 A spiral fluted reamer and magnetic drill press are the best way to bore the holes out 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75795-rd688-trunnion-replacement/#findComment-579393 Share on other sites More sharing options...
terry Posted July 18 Share Posted July 18 6 hours ago, Moparmike said: No sir I bought the 1 you cut the old out and new comes in from top or bottom I have heard of them,three pieces? terry Quote Link to comment https://www.bigmacktrucks.com/topic/75795-rd688-trunnion-replacement/#findComment-579400 Share on other sites More sharing options...
Moparmike Posted July 18 Author Share Posted July 18 1 hour ago, D-Day said: A spiral fluted reamer and magnetic drill press are the best way to bore the holes out Yes sir I have the mag drill and reamer Quote Link to comment https://www.bigmacktrucks.com/topic/75795-rd688-trunnion-replacement/#findComment-579404 Share on other sites More sharing options...
Moparmike Posted July 18 Author Share Posted July 18 54 minutes ago, terry said: I have heard of them,three pieces? terry I’ve used 1 in my other truck before no problem with it heavier steel the other 1 and this 1 cracked in the same place right off the chassis in the bend and this 1 has a few more cracks 2 Quote Link to comment https://www.bigmacktrucks.com/topic/75795-rd688-trunnion-replacement/#findComment-579405 Share on other sites More sharing options...
Joey Mack Posted July 18 Share Posted July 18 Wish i had known about them a dozen a-frames ago.. do they have a long life span ? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75795-rd688-trunnion-replacement/#findComment-579408 Share on other sites More sharing options...
Popular Post Moparmike Posted July 18 Author Popular Post Share Posted July 18 23 minutes ago, Joey Mack said: Wish i had known about them a dozen a-frames ago.. do they have a long life span ? They are supposed to to be better the factory the design and build and of course easy of installation my truck came with rubber busing no grease fitting and it’s 4100.0” I opted for the brass busing with grease fitting 2200.00 I believe all parts and stand was cheaper then just the factory design stand with rubber busing shipped was around 3500.00 sigh all parts needed 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75795-rd688-trunnion-replacement/#findComment-579411 Share on other sites More sharing options...
Moparmike Posted July 18 Author Share Posted July 18 Here’s a picture of the stand 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75795-rd688-trunnion-replacement/#findComment-579412 Share on other sites More sharing options...
Joey Mack Posted July 18 Share Posted July 18 Thats awesome. I guess ibwas thinking about all the twisting of the frame when off road, loosening up the bolts. Thanks bud Quote Link to comment https://www.bigmacktrucks.com/topic/75795-rd688-trunnion-replacement/#findComment-579413 Share on other sites More sharing options...
Moparmike Posted July 18 Author Share Posted July 18 16 minutes ago, Joey Mack said: Thats awesome. I guess ibwas thinking about all the twisting of the frame when off road, loosening up the bolts. Thanks bud Yes sir I appreciate all the help you give out 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75795-rd688-trunnion-replacement/#findComment-579415 Share on other sites More sharing options...
Popular Post Mark T Posted July 19 Popular Post Share Posted July 19 5 hours ago, Joey Mack said: Thats awesome. I guess ibwas thinking about all the twisting of the frame when off road, loosening up the bolts. Thanks bud They work. Save a lot of cut'n and welding on a dump truck too. They seem a little heavier as far as adding a couple pounds to the truck,but otherwise I've seen lots of guys get good results from them. Dump trucks, mixers....they work. 3 Quote Link to comment https://www.bigmacktrucks.com/topic/75795-rd688-trunnion-replacement/#findComment-579451 Share on other sites More sharing options...
cruiseliner64 Posted July 19 Share Posted July 19 14 hours ago, Moparmike said: Here’s a picture of the stand Thats a very neat idea...not over costly too.. Paul Quote Link to comment https://www.bigmacktrucks.com/topic/75795-rd688-trunnion-replacement/#findComment-579455 Share on other sites More sharing options...
Moparmike Posted August 2 Author Share Posted August 2 Any of you guys know of a good place to buy a replacement 1 inch reamer for my chassis the 1 I had is now missing Quote Link to comment https://www.bigmacktrucks.com/topic/75795-rd688-trunnion-replacement/#findComment-580204 Share on other sites More sharing options...
Moparmike Posted 7 hours ago Author Share Posted 7 hours ago Well guys I’m trying to document my journey on this jnstall serms my pics or to big but I’ll try get them so I can post them I’m at the point of sliding the springs off and cutting the stand out I’m about 5/ 6 hrs in rain on 2 days so not on it as planned Quote Link to comment https://www.bigmacktrucks.com/topic/75795-rd688-trunnion-replacement/#findComment-580563 Share on other sites More sharing options...
Brocky Posted 4 hours ago Share Posted 4 hours ago 2 hours ago, Moparmike said: erms my pics or to big There was a while I had to go thru Postimage.com (afreebe site)to get mine to post Quote Brocky Link to comment https://www.bigmacktrucks.com/topic/75795-rd688-trunnion-replacement/#findComment-580586 Share on other sites More sharing options...
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