Rockstarmx21 Posted September 26 Share Posted September 26 Dose anyone have an air line diagram for a Mack 12 speed 1070A with deep reduction. Everything works but my low range gears I’m looking for a diagram to make sure my air line are correct Quote Link to comment https://www.bigmacktrucks.com/topic/74585-1990-rb688s-mack-12speed-trans/ Share on other sites More sharing options...
Joey Mack Posted September 27 Share Posted September 27 have you un hooked those lines and flipped the splitter to see if air is delivered.? Quote Link to comment https://www.bigmacktrucks.com/topic/74585-1990-rb688s-mack-12speed-trans/#findComment-559072 Share on other sites More sharing options...
mrsmackpaul Posted September 27 Share Posted September 27 Has work been done and it hasn't worked since or has it always been issue ? Paul Quote Link to comment https://www.bigmacktrucks.com/topic/74585-1990-rb688s-mack-12speed-trans/#findComment-559084 Share on other sites More sharing options...
Rockstarmx21 Posted September 27 Author Share Posted September 27 The trans was taken out to be rebuilt and some where while putting it back in the air lines got hooked up wrong Quote Link to comment https://www.bigmacktrucks.com/topic/74585-1990-rb688s-mack-12speed-trans/#findComment-559087 Share on other sites More sharing options...
mrsmackpaul Posted September 27 Share Posted September 27 How many air regulators does it have, 1 or 2 Here is a old air line diagram with some useless buggers chicken scratch all over it This is for a single air regulator Quote Link to comment https://www.bigmacktrucks.com/topic/74585-1990-rb688s-mack-12speed-trans/#findComment-559127 Share on other sites More sharing options...
Rockstarmx21 Posted September 30 Author Share Posted September 30 On 9/27/2024 at 5:56 PM, mrsmackpaul said: How many air regulators does it have, 1 or 2 Here is a old air line diagram with some useless buggers chicken scratch all over it This is for a single air regulator It has one regulator and that’s on the firewall I’m looking for the 1070A air line diagram with the deep reduction Quote Link to comment https://www.bigmacktrucks.com/topic/74585-1990-rb688s-mack-12speed-trans/#findComment-559265 Share on other sites More sharing options...
mrsmackpaul Posted October 1 Share Posted October 1 Im gunna look like a complete dick here But the regulators on the Mack boxes I have worked on are mounted on the box on a bracket on the LHS I have never seen a regulator on the fire wall I'm sure someone else will chime in soon enough Try this link to this web site, it might be of some help Paul Quote Link to comment https://www.bigmacktrucks.com/topic/74585-1990-rb688s-mack-12speed-trans/#findComment-559318 Share on other sites More sharing options...
Rockstarmx21 Posted October 4 Author Share Posted October 4 Mine has two regulators Quote Link to comment https://www.bigmacktrucks.com/topic/74585-1990-rb688s-mack-12speed-trans/#findComment-559543 Share on other sites More sharing options...
mrsmackpaul Posted October 4 Share Posted October 4 1. Air Control Reference Locator 2. Air Control Select Lever 3. Gear Select Lever 4. Quick Release Valve 5. Exhaust 6. Reverse Shift Cylinder 7. Port No. 4 8. Port No. 3 9. Back-Up Switch (normally open) 10. Amber Indicator Light (on in reverse) 11. Pressure Reducing Valve (60 psi delivery) 12. Port No. 2 TRTXL1070, Serial Number 8S6798 and later 12. Hi/Direct Shift Cylinder 13. Pressure Reducing Valve (70 psi delivery) 14. Air Filter 15. Air Supply 16. Selectair Valve 17. Exhaust A. Section A - A B. Piston Port C. Pressure D. Exhaust 11. Port No. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74585-1990-rb688s-mack-12speed-trans/#findComment-559549 Share on other sites More sharing options...
mrsmackpaul Posted October 4 Share Posted October 4 This should be close enough Deep reduction is on the second stick in this diagram When you say your low range isnt working Are you talking about high low - split or deep reduction If it is low range as you say then this should get things sorted Paul Quote Link to comment https://www.bigmacktrucks.com/topic/74585-1990-rb688s-mack-12speed-trans/#findComment-559550 Share on other sites More sharing options...
Rockstarmx21 Posted October 7 Author Share Posted October 7 On 9/27/2024 at 5:56 PM, mrsmackpaul said: How many air regulators does it have, 1 or 2 Here is a old air line diagram with some useless buggers chicken scratch all over it This is for a single air regulator It has one regulator and that’s on the firewall I’m looking for the 1070A air line diagram with the deep reduction Quote Link to comment https://www.bigmacktrucks.com/topic/74585-1990-rb688s-mack-12speed-trans/#findComment-559666 Share on other sites More sharing options...
Rockstarmx21 Posted October 7 Author Share Posted October 7 The high low is what messed up I have all my high range gears but I don’t have my low range gears Quote Link to comment https://www.bigmacktrucks.com/topic/74585-1990-rb688s-mack-12speed-trans/#findComment-559667 Share on other sites More sharing options...
mrsmackpaul Posted October 8 Share Posted October 8 The diagram above shoukd be fine Paul Quote Link to comment https://www.bigmacktrucks.com/topic/74585-1990-rb688s-mack-12speed-trans/#findComment-559679 Share on other sites More sharing options...
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