AD 40 reverse gear.

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   Hi All, 
New person here which means I'm doing this wrong and am bracing for an onslaught of responses telling me I did it wrong.

I have an Allis Chalmers AD40 with cab-over, year is unknown and serial plate is unreadable but I think I've traced it to '62-63. Power plant is a Detroit 4-71.

I'm looking for a little advice and perhaps some resources for parts. 

I have no reverse and looking at the parts manual, it seems that it must be the reverse idler gear. I was told by the previous owner that the cab needed to be removed to access the transmission but I can't understand why that would be necessary: All of the transmission bolts seem to be front facing and I even have easy access to remove the idler shaft... which I'm wondering if someone did by mistake and thus the reason for no reverse.

Questions:
What is the best way to remove the transmission (I have no gantry or crane)?
Does anyone here have resources for reverse idler gear and also a mold board ring worm gear?

Thanks in advance and sorry I did it wrong.

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Cml9868 Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 18 Jan 2022 Location: OREGON Points: 3	Post Options Post Reply Quote Cml9868 Report Post Thanks(0) Quote Reply Topic: AD 40 reverse gear. Posted: 18 Jan 2022 at 9:06pm
	Hi All, New person here which means I'm doing this wrong and am bracing for an onslaught of responses telling me I did it wrong. I have an Allis Chalmers AD40 with cab-over, year is unknown and serial plate is unreadable but I think I've traced it to '62-63. Power plant is a Detroit 4-71. I'm looking for a little advice and perhaps some resources for parts. I have no reverse and looking at the parts manual, it seems that it must be the reverse idler gear. I was told by the previous owner that the cab needed to be removed to access the transmission but I can't understand why that would be necessary: All of the transmission bolts seem to be front facing and I even have easy access to remove the idler shaft... which I'm wondering if someone did by mistake and thus the reason for no reverse. Questions: What is the best way to remove the transmission (I have no gantry or crane)? Does anyone here have resources for reverse idler gear and also a mold board ring worm gear? Thanks in advance and sorry I did it wrong.
	It ain't old it's just prematurely gray. Allis Chalmers AD40 Ford 276 Versatile JI Case VAI

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CAL(KS) Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 18 Sep 2009 Location: Chapman, KS Points: 3786	Post Options Post Reply Quote CAL(KS) Report Post Thanks(0) Quote Reply Posted: 19 Jan 2022 at 7:16am
	I dont have any input on procedure but i can tell you the machine is not that new. 52-53 is more like its build date if not a few years earlier. Did you verify the shift pattern? on my grader the inner stick has 3 speeds, and the outer has high, low and reverse off to the right. i believe the ad40 and ad45 use this pattern but the Bd series is different.
	Me -C,U,UC,WC,WD45,190XT,TL-12,145T,HD6G,HD16,HD20 Dad- WD, D17D, D19D, RT100A, 7020, 7080,7580, 2-8550's, 2-S77, HD15

SteveM C/IL Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Location: Shelbyville IL Points: 8246	Post Options Post Reply Quote SteveM C/IL Report Post Thanks(0) Quote Reply Posted: 22 Jan 2022 at 1:57pm
	Some things I know and some things I think. Worked on AD40 trans shift fork twice 45-50 yrs ago. (broke off). I know the cab was never removed. I THINK we removed trans for that because I remember seeing the clutch.I think we did it in the driveway not inside.Have no recollection how it was held/lifted. Doesn't the seat area fold fwd when unbolted? Don't know if we used a chain hoist hanging from roof?. Not much help really but know the cab never was removed.

Cml9868 Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 18 Jan 2022 Location: OREGON Points: 3	Post Options Post Reply Quote Cml9868 Report Post Thanks(0) Quote Reply Posted: 23 Jan 2022 at 3:34pm
	Hey Steve, Thanks for the reply. As much as I may be looking for new information, a validation of my own suspicions may be just as useful and you've provided that. In an information vacuum, a "maybe" carries almost as much weight as a "yes". I can see in various documents that the seat does tilt but it appears that the cab is in the way of that function. There is an access plate in the floor of the cab which I plan to use. I'll make a frame in the cab to suspend a chain hoist through the floor then unbolt the transmission and lower it to the ground. Always easier said than done... Thank you for your help.
	It ain't old it's just prematurely gray. Allis Chalmers AD40 Ford 276 Versatile JI Case VAI