AC PTO
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=168365
Printed Date: 19 Jul 2025 at 5:22am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: AC PTO
Posted By: milomilo
Subject: AC PTO
Date Posted: 15 Feb 2020 at 5:49pm
|
I have a 1967 AC 190XT which has a 1000 rpm PTO. I would like to convert it to a 540 rpm. I have read they made the 540, 1000 and the 540/1000. Seems to me there must be a way to change gears/shafts to change mine from 1000 to a single 540 rpm. Am I correct or is it not possible? |
Replies:
Posted By: DiyDave
Date Posted: 15 Feb 2020 at 5:56pm
Later tractors came with a reversible PTO shaft, likely yours is dedicated 1000 RPM unit. Earlier ones were either 540 or 1000, dedicated. I don't know what would be involved to do the change over to get 540 out of yours... ------------- Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need! |
Posted By: milomilo
Date Posted: 15 Feb 2020 at 6:15pm
|
Thanks for the reply. |
Posted By: SteveM C/IL
Date Posted: 15 Feb 2020 at 8:12pm
| Someone will have the answer. I'd bet possible but may be too involved. |
Posted By: DrAllis
Date Posted: 15 Feb 2020 at 9:18pm
| You have to drop the PTO box under the belly and change two gears. Now the question is, are you a manual "grind-it-in-gear" style PTO, or the hydraulic clutch type?? The first one is pretty easy to change and the hyd clutch type more difficult unless you change out the whole PTO box. |
Posted By: milomilo
Date Posted: 15 Feb 2020 at 9:54pm
|
I just got the tractor and a not sure yet. Should have the answer tomorrow. ------------- Chris (WY) |
Posted By: milomilo
Date Posted: 16 Feb 2020 at 11:14am
|
The PTO has a lever on the right inner side of the seat that says engaged and brake. Forward is engaged. Can you tell from this info if it is manual or hydraulic, or do I need to try to shift it without the clutch in to see if it is manual? ------------- Chris (WY) |
Posted By: DrAllis
Date Posted: 16 Feb 2020 at 11:23am
| That's the optional hydraulic clutch PTO. Are you sure what you have on the rear of the tractor isn't the 540/1000 style with the 1000 side turned out ?? |
Posted By: DougG
Date Posted: 16 Feb 2020 at 11:29am
| I bet thats it too, never seen one as just 1000, but there could be |
Posted By: milomilo
Date Posted: 16 Feb 2020 at 12:35pm
I did start the tractor, in neutral and engine running and I can shift the pto lever in and out with no grinding, not like my Farmall M. ------------- Chris (WY) |
DrAllis wrote:Posted By: milomilo
Date Posted: 16 Feb 2020 at 12:39pm
No, I am not sure. I will check the splines and see what the spline number is. ------------- Chris (WY) |
Posted By: milomilo
Date Posted: 16 Feb 2020 at 12:56pm
|
The shaft and clutch were replaced by the PO. The pto output shaft is fine spline now. Not the 6 spline I see on a 540 pto. ------------- Chris (WY) |
Posted By: milomilo
Date Posted: 16 Feb 2020 at 12:59pm
|
How do you post pics on this forum? ------------- Chris (WY) |
Posted By: milomilo
Date Posted: 16 Feb 2020 at 1:00pm
|
The shaft they replaced is a 540 6 spline. ------------- Chris (WY) |
Posted By: Joe(OH)
Date Posted: 16 Feb 2020 at 1:22pm
|
How many bolts hold the shaft in? ------------- Life is simpler when you plow around the stump. |
Posted By: milomilo
Date Posted: 16 Feb 2020 at 2:17pm
Three. ------------- Chris (WY) |
Posted By: DrAllis
Date Posted: 16 Feb 2020 at 2:52pm
| Well then, provided they changed the PTO clutch assembly or the gears on the clutch and its driving gear, you do have 1,000 RPM only. I don't suppose the owner gave you the old parts ?? |
Posted By: milomilo
Date Posted: 16 Feb 2020 at 3:50pm
I do have the old shaft and the hydraulic clutch and a bag of small parts. Would it help if I posted pictures of everything?
------------- Chris (WY) |
Posted By: DrAllis
Date Posted: 16 Feb 2020 at 4:20pm
| Wouldn't hurt, but if you have the whole PTO box with the clutch inside of it and a single gear all by itself and a rear 540 spline PTO shaft, you should have all you need. |
Posted By: milomilo
Date Posted: 16 Feb 2020 at 4:24pm
I will look in the bag for the gear and let you know. ------------- Chris (WY) |
Posted By: milomilo
Date Posted: 16 Feb 2020 at 5:14pm
Pics of all the parts they gave me. I do not see a gear. ------------- Chris (WY) |
Posted By: Ed (Ont)
Date Posted: 16 Feb 2020 at 5:44pm
|
I see a gear. Is that not the one? |
Posted By: milomilo
Date Posted: 16 Feb 2020 at 5:46pm
I was thinking he meant a small gear internal to the clutch. Likely a bad assumption. ------------- Chris (WY) |
Posted By: DrAllis
Date Posted: 16 Feb 2020 at 6:01pm
| I see the clutch gear, but not the smaller gear that drives it. |
Posted By: milomilo
Date Posted: 16 Feb 2020 at 6:40pm
|
No other gear in the bag. It does make me wonder that If the shaft they replaced was for a 540, why put in a 1000 shaft. Kinda makes me think to just put the old shaft back in so I have the 540 spline. Probably not that simple. I have a Massey 1100 that I think I will check what the pto looks like running and compare it to the Allis. Could be the guy I got it from was wrong about it being a 1000. ------------- Chris (WY) |
Posted By: milomilo
Date Posted: 17 Feb 2020 at 12:37pm
|
DrAllis: What do you recommend now? ------------- Chris (WY) |
Posted By: DrAllis
Date Posted: 17 Feb 2020 at 1:03pm
| I have a tachometer and would check the actual PTO speed at full throttle. If it is about 660 to 680 RPM, you have 540 gearing. If it is 1100 RPM or so, you have 1000 RPM gearing. You can shove the 540 shaft into it and regardless of the actual speed it will work. |
Posted By: milomilo
Date Posted: 17 Feb 2020 at 3:10pm
Ordered a hand held tachometer today. Been wanting one several times over the years. I will always remember it was you that made me buy one.  Update coming in a few days. Thanks much for your help with this.------------- Chris (WY) |
Posted By: Pete from IL
Date Posted: 19 Feb 2020 at 8:37am
| If you can find a 2 speed rear pto-lift arm housing you can put that on and then you will have the reversible 540-1000 pto shaft. Thats what I did years ago with my XT190 with full time 1000 pto. You will need the shaft that drives the pto assembly also. Something else to think about. |
Posted By: milomilo
Date Posted: 19 Feb 2020 at 9:33am
|
Thanks Pete. I will keep that idea as an option. ------------- Chris (WY) |
Posted By: ac fleet
Date Posted: 19 Feb 2020 at 12:18pm
|
My 190 is 540 only.-- didn't know about the 1,000 crap! wow! mine is also " grind-in-gear" type, no hyd. on it. --- Looks like I got lucky and have the good stuff! lol! ------------- http://machinebuildersnetwork.com/ |
Posted By: milomilo
Date Posted: 20 Feb 2020 at 10:25am
I am not sure what you mean about the 2 speed pto lift arm housing. I thought the 3 point lift was not associated the the pto. ------------- Chris (WY) |
Posted By: DrAllis
Date Posted: 20 Feb 2020 at 10:55am
| A tractor equipped with the 540/1000 RPM PTO has a different lift arm housing on it. Inside the lift arm housing are 4 gears which allow for the two-speeds. Direct drive is 1000 RPM and the 540 speed comes thru the four internal slow-down gears. In order to have this dual speed option, the front end of the PTO drive must be 1,000 RPM, like we think yours currently is. If you install the dual-speed lift arm housing on a tractor that is only 540 on the front end, you'll wind up with a 260/540 PTO. |
Posted By: milomilo
Date Posted: 20 Feb 2020 at 5:13pm
My handheld tachometer arrived today. Hope to get the RPM measured tomorrow. Then at least I will know where I stand. ------------- Chris (WY) |