masterwelder Posted December 31, 2022 Share Posted December 31, 2022 My truck is a 2000 RD688s Tractor with E7 400 and a Eaton Fuller 14909MLL transmission. My truck also has a REPTO (rear engine power take off). I’m taking the 9LL out along with the REPTO. I have a standard ETech engine bell housing to replace the REPTO engine bell housing. The new transmission will be a RTLO 18918B. My question is about the correct mounts and location. I’m wondering if someone has a RD with a factory Eaton 18sp that would be willing to share the vin so I can source the correct mounts/ transmission bell housing? Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/ Share on other sites More sharing options...
Joey Mack Posted December 31, 2022 Share Posted December 31, 2022 i know the tranny mounts are in the same spot on the Eatons,, just like Mack tranny's. The back boxes are different.. ...... RD 688-S/ 045719 Is a 2001 RD that i have worked on.. E-Tech with an 8LL.. This should be what you need to check and see if your tranny hangers are different.. No REPTO on this truck.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-519455 Share on other sites More sharing options...
masterwelder Posted January 1, 2023 Author Share Posted January 1, 2023 Thanks Jojo. After reading your post I brought my 2001 RD688S dump truck with a 427 and 8Ll in to measure things up and compare. I was initially thinking I needed info from a truck with a eaton 18 in it but- I see that both trucks have the mounts on the transmission bell housing. So I’ll need to make sure the new 18sp comes with the correct transmission bell housing. Other than that the only difference I see is because of the REPTO flywheel housing being about 4.5” longer than a regular flywheel housing, once it’s removed and replaced with the regular flywheel housing, the mounts will need to come ahead. It also looks like the frame side mounts are angled and by switching them left to right and right to left they may bolt in the same spot as the dump truck and line up with the new trans and flywheel bell housing. The transmission side mounts are the same on both trucks. Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-519533 Share on other sites More sharing options...
Joey Mack Posted January 1, 2023 Share Posted January 1, 2023 Thanks for posting again.. I would like to know what other differences you find, if any. Plus it is good for future questions about this.. are you saying the REPTO housing is 4.5" longer measuring at the seem on the engine block? if so then the tranny is set back 4.5 inches more than your '01 RD? which may result in a drive shaft change.. jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-519534 Share on other sites More sharing options...
masterwelder Posted January 2, 2023 Author Share Posted January 2, 2023 Yes, will have to lengthen the driveshaft when the new 18 is in. I’ll keep you posted if anything else comes up. Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-519559 Share on other sites More sharing options...
Joey Mack Posted January 2, 2023 Share Posted January 2, 2023 👍 Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-519560 Share on other sites More sharing options...
Joey Mack Posted January 2, 2023 Share Posted January 2, 2023 Unfortunately, I have No practical knowledge of REPTO's.. I have seen them and made a few repairs many years ago, But I have forgotten all of it.. I'm just glad that I have a Mack svc. manual on REPTO's,, in the case I have to do a repair, or post the info here.. P.M. me if you need me to send a picture of the book and its pages.. Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-519561 Share on other sites More sharing options...
Joey Mack Posted January 2, 2023 Share Posted January 2, 2023 Here is the only REPTO book I have.. It is for E-7's, but I wonder if it has info for you.. Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-519562 Share on other sites More sharing options...
masterwelder Posted January 3, 2023 Author Share Posted January 3, 2023 I have one too- Looking it over it should not be a bad job to remove the REPTO and install the standard flywheel housing. Going to be nice having a Eaton 18 in the tractor. Mostly I’m pulling a 55 Ton Fontaine Magnitude Lowboy. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-519869 Share on other sites More sharing options...
Popular Post masterwelder Posted January 3, 2023 Author Popular Post Share Posted January 3, 2023 5 Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-519870 Share on other sites More sharing options...
Popular Post masterwelder Posted January 23, 2023 Author Popular Post Share Posted January 23, 2023 New 18 showed up this week, shop yanked out the 9LL and the REPTO on Friday. 4 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-523599 Share on other sites More sharing options...
masterwelder Posted January 23, 2023 Author Share Posted January 23, 2023 Stopped in at the shop quick between pushing snow into piles and the bell housing was on, flywheel was back from resurfacing and they were in the process of relocating the transmission mounts. They hoped to have the trans in by the afternoon and driveshaft ready to be sent out to be lengthened. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-523652 Share on other sites More sharing options...
masterwelder Posted January 27, 2023 Author Share Posted January 27, 2023 Turns out the transmission side mounts are different. I was able to get the numbers off the transmission mounts on my dump truck. I think the frame side mounts are the same but will do some measuring in the morning. The transmission mount part numbers I believe I need are, 158GB4553A and 158GB4554A. So we are at a standstill for now. Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-523963 Share on other sites More sharing options...
Joey Mack Posted January 28, 2023 Share Posted January 28, 2023 Yeah that's why I posted a VIN for you from an RD. I was hoping it would have helped.. Sorry bud.. Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-523965 Share on other sites More sharing options...
masterwelder Posted January 28, 2023 Author Share Posted January 28, 2023 Thanks Joey. My truck has a single frame. I’m unsure if the inner frame dimensions are the same as a double frame truck? In other words did Mack maintain the inner frame dimension or did it get narrower as they added layers of frame. My RD dump is double framed. I wonder if the same mounts are used on a single frame truck. I really wish Mack would give us access like I have with caterpillar on my heavy equipment. In the caterpillars SIS system I can go in with the Vin number for any piece of equipment and get the complete breakdown right to the bolt and nut specifications. Saves a lot of phone calls to the caterpillar parts department you can do all of your own research. I would love to run a vin number of a double frame RD against a single frame RD with a E7 and Eaton manual trans to see if they use the same frame side and trans side mounts. I think I found a single frame RD vin number with an E7 and Eaton, they’re not that common at least on TruckPaper right now. Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-523997 Share on other sites More sharing options...
masterwelder Posted January 28, 2023 Author Share Posted January 28, 2023 (edited) Well got my Mack frame book out and might’ve answered my own question about the single frame versus double frame, triple etc. According to the book a double frame truck will have the second frame on the inside of the main frame. Any additional layers after a double will be to the outside of the main frame. With that being said it would make sense that mounting brackets would be narrower on a double frame truck than a single frame. Or a spacer is used to make up the space, similar to having an inner rail on a single frame, then the same brackets can be used regardless of the frame thickness. Edited January 28, 2023 by masterwelder Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-523999 Share on other sites More sharing options...
masterwelder Posted January 28, 2023 Author Share Posted January 28, 2023 Here are the frame options from a RD600S brochure dated 1998. Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-524004 Share on other sites More sharing options...
masterwelder Posted February 3, 2023 Author Share Posted February 3, 2023 I got the correct mounts in Wednesday, shop told me this afternoon truck is ready. I’m planing on road test Sunday. -4 here at the moment, Sunday it’s supposed to be 45. Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-524528 Share on other sites More sharing options...
Joey Mack Posted February 3, 2023 Share Posted February 3, 2023 I hope you have that: 'Child on Christmas Morning Experience.'.... jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-524530 Share on other sites More sharing options...
masterwelder Posted February 4, 2023 Author Share Posted February 4, 2023 Me too! New trans and the removal of the REPTO. The REPTO is kinda heavy- 3 good size gears plus several bearings and it took two oil lines. Aluminum housing but it all ads up. No doubt took HP to turn even if not connected to anything. Hope my oil pressure comes up a little, I was on the lower side when hot. I wanted the REPTO out the day I bought the truck. When the 9ll started to occasionally slip out of 3/7 gear I took the opportunity to get rid of it and slip in the 18. Turns out the clutch was in need and the rear main was leaking so I would of been in there soon anyway. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-524532 Share on other sites More sharing options...
fullfuel01 Posted February 4, 2023 Share Posted February 4, 2023 Do you want to sell your repto? Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-524577 Share on other sites More sharing options...
masterwelder Posted February 4, 2023 Author Share Posted February 4, 2023 3 hours ago, fullfuel01 said: Do you want to sell your repto? Yes. Can’t see having a use for it myself. Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-524597 Share on other sites More sharing options...
Popular Post masterwelder Posted February 7, 2023 Author Popular Post Share Posted February 7, 2023 Got the truck back home yesterday. The 18 is great for keeping the engine in the power band. My oil pressure is the same despite removing the REPTO. All in all I believe it will be money well spent. 4 Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-524737 Share on other sites More sharing options...
Joey Mack Posted February 7, 2023 Share Posted February 7, 2023 That is Great!! Sweet looking RD !!! That's a REAL TRUCK.. 👍 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-524738 Share on other sites More sharing options...
Joey Mack Posted February 7, 2023 Share Posted February 7, 2023 When I was with the construction co. In Scarborough Maine,. The last tractor that was assigned to me was a '97 RD.. E-7 400,,, 18 spd. Mack tranny,,, Mack Rears, 4.17 I think.. it would out pull the new E-Tech 427's... At the time.. Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70946-rd688s-with-eaton-18-speed/#findComment-524771 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.