Welcome! Please use the navigational links to explore our website.
PartsASAP LogoCompany Logo Auction Link (800) 853-2651

Shop Now

   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver

Tractor Talk Discussion Forum

John Deere transmissions?

Welcome Guest, Log in or Register
Author 
Danny

09-19-2003 18:51:35




Report to Moderator

In simple terms what does a power shift transmission and synchro transmission have that is different from just a regular transmission or how do they work differently than just a normal clutch and shift transmission? Thanks.




[Log in to Reply]   [No Email]
JMS/MN

09-19-2003 22:35:51




Report to Moderator
 Re: John Deere transmissions? in reply to Danny, 09-19-2003 18:51:35  
The JD Powershift is like an automatic transmission in that you do not NEED to use the clutch- they call it an inching pedal- to shift from one speed to another. With the synchro tranny, you have about 4 stations-= need to use the clutch to shift from one station to another. Each station has a couple of forward gears and some have one or two reverses. Within each station, the gears are synchronized, you use the clutch but do not need to come to a complete stop- they can shift on the fly. Powershift delivers less power to the drawbar, but is offset with the convenience of popping from one gear to another. Powershift lasts longer but costs more to repair. Since 1973 I've had four Powershifts, rebuilt one. Two have over 8000 hrs, one has over 10000 hrs, the one that was rebuilt was a plantation tractor with ? hrs. Meter showed 5000, mechanic said maybe 3x that.

[Log in to Reply]  [No Email]
JMS/MN

09-19-2003 22:32:47




Report to Moderator
 Re: John Deere transmissions? in reply to Danny, 09-19-2003 18:51:35  
The JD Powershift is like an automatic transmission in that you do not NEED to use the clutch- they call it an inching pedal- to shift from one speed to another. With the synchro tranny, you have about 4 stations-= need to use the clutch to shift from one station to another. Each station has a couple of forward gears and some have one or two reverses. Within each station, the gears are synchronized, you use the clutch but do not need to come to a complete stop- they can shift on the fly. Powershift delivers less power to the drawbar, but is offset with the convenience of popping from one gear to another. Powershift lasts longer but costs more to repair.

[Log in to Reply]  [No Email]
RJ-AZ

09-19-2003 19:38:12




Report to Moderator
 Re: John Deere transmissions? in reply to Danny, 09-19-2003 18:51:35  
The power shift is basicaly an automatic trans without a torque convertor. The clutch is actualy a dump valve. There is a torque damper on the flywheel though. It is like a clutch with no release forks although JD did have a release mechanism on some early model 3020's.The PTO is part of this package also and is engaged hydraulicly.
The early synchro range is a pure gear transmission with a dry type clutch. The PTO is incorporated into the main clutch setup but is controlled by a seperate lever and not by a two stage pedal. The slot machine shifter really controls a 4 speed main with a 2 speed. This gives you 8 forward and 2 reverse speeds.

[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:


TRACTOR PARTS TRACTOR MANUALS
We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home  |  Forums


Copyright © 1997-2023 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy