540 PTO(d17 series 1)
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=172371
Printed Date: 05 Nov 2025 at 5:08pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 540 PTO(d17 series 1)
Posted By: Hunt4Allis
Subject: 540 PTO(d17 series 1)
Date Posted: 26 Jun 2020 at 8:58pm
What does this refer to?
How do I know if mine is this PTO?
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Replies:
Posted By: MACK
Date Posted: 26 Jun 2020 at 9:17pm
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Did I miss something? MACK
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Posted By: bigal121892
Date Posted: 26 Jun 2020 at 9:20pm
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It refers to the speed of the PTO at rated engine RPM. 540 RPM at whatever the rated engine speed is. The 540 PTO shaft will have 6 splines, and be 1-3/8" in diameter. Then there is the 1,000 PTO, it turns at a speed of 1,000 RPM, and comes in two sizes the "small", which is 1-3/8" and has 21 splines, or the "large", which is 1-34" in diameter, and has 20 splines.
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Posted By: DrAllis
Date Posted: 26 Jun 2020 at 9:25pm
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On any D-17 when the engine is running 1650 RPM the PTO (when engaged) is running approximately 540 RPM.
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Posted By: Hunt4Allis
Date Posted: 27 Jun 2020 at 6:23am
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Ok, but how can you tell when running at the rpm that makes 540 PTO?( Is it wide open throttle?) thanks Matt 👍
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Posted By: DrAllis
Date Posted: 27 Jun 2020 at 6:38am
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That is what the tachometer is for on the instrument panel. Wide open throttle (on a correctly adjusted D-17) is 2,000 RPM which is 665 RPM pto speed. 540 RPM is very important for square balers, sickle mowers, corn pickers, etc. A forage blower or forage chopper is always run at full throttle.
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Posted By: Hunt4Allis
Date Posted: 27 Jun 2020 at 6:46am
Hmmmm, I ran my sickle mower last year on the d17 ( which had occasional cutting issues)so with a dirty gas tank/ carburetor...
Makes me wonder if that was the issue because I did not have the proper PTO speed...
So a sickle mower should run at 540?
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Posted By: AaronSEIA
Date Posted: 27 Jun 2020 at 6:57am
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Everything is built to run at 540. Depending on the load, that may only be 1650 engine rpm, or it may be full throttle with the governor doing the work. AaronSEIA
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Posted By: DrAllis
Date Posted: 27 Jun 2020 at 7:14am
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In the case of a square baler or sickle mower, slower than 540 isn't bad, but not as productive. TOO FAST shakes things apart !!!!!
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Posted By: Hunt4Allis
Date Posted: 27 Jun 2020 at 1:07pm
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Okay my next chore is to get my tachometer reading correctly again then. Any tips on doing this or is it pretty straightforward?
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Posted By: SteveM C/IL
Date Posted: 27 Jun 2020 at 1:19pm
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Dad used the shaft tack and guaged the quadrant on the WD for combining and bar mowing. Remember him yanking the throttle open when a slug was heading for the cylinder on the 90.
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Posted By: Hunt4Allis
Date Posted: 27 Jun 2020 at 1:32pm
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I think I bought a new tachometer and a couple other gauges a while ago when I first bought the d-17 and meant to put new gauges on it but then got consumed with other projects oh, so I think it's just a matter of taking the old out and putting the new in and hopefully (knock on wood it just works!)
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Posted By: Hunt4Allis
Date Posted: 27 Jun 2020 at 2:21pm
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Is it very important to run a round baler like a New Holland 851?
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Posted By: Joe(TX)
Date Posted: 27 Jun 2020 at 2:43pm
If you are running something that needs the HP, you need to run as close to 540 as you can. Speeds below that are at reduced HP from the engine. If the tractor has plenty of HP and run at reduced speed, you put more stress on the driveline because you have to have increased torque to get the required HP.
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1970 190XT, 1973 200, 1962 D-19 Diesel, 1979 7010, 1957 WD45, 1950 WD, 1961 D17, Speed Patrol, D14, All crop 66 big bin, 180 diesel, 1970 170 diesel, FP80 forklift. Gleaner A
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Posted By: AaronSEIA
Date Posted: 28 Jun 2020 at 6:06am
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Fixing the tach is as easy as ordering a new one and cable from http://www.djstractorparts.com " rel="nofollow - www.djstractorparts.com
AaronSEIA
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Posted By: Hunt4Allis
Date Posted: 28 Jun 2020 at 7:01am
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So the tach works mechanically connected to something else ( are the cables always bad, or just good to replace when doing the gauge so it's more accurate?)
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Posted By: DrAllis
Date Posted: 28 Jun 2020 at 8:23am
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Tachometer cables have nothing to do with accuracy. They are just a means to locate the tachometer away from the engine to where the Operator is. They last for many years as a rule, but if you going to use an old one, I'd sure hang it from something up high to stretch it out straight and drizzle some kind of oil/penetrating oil down inside to lube it up before using it.
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Posted By: Hunt4Allis
Date Posted: 28 Jun 2020 at 8:37am
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Ok, thanks much for great info drallis!
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