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420 specs

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staco

10-27-2002 12:43:32

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I am thinking of buying a 420 at an auction. what I would be using it for is pulling or slow race. until I go to the sale I don`t know if it is a 4 or 5 speed. the serial # is u-90675. where can I find the specs that would tell me the speed in different gears and max r.p.m.

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G Taylor

10-28-2002 18:17:14

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Re: 420 specs in reply to staco, 10-27-2002 12:43:32

One of the best descriptions and histories of the M through 440's if J.R. Hobbs's book Little Giants. That combined with the parts CD answeres most questions and what parts can be mixed and matched. That's a 1956 model year with a four speed, transmission driven pto, all green paint with the 40 style starter mount.

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10-27-2002 17:19:26

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Re: 420 specs in reply to staco, 10-27-2002 12:43:32

If the tractor you are looking at has its original tranny, it is a 4 speed, like mine is.(serial # 83327) Were no 5 speeds til serial # 100001

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Steve - IN

10-27-2002 13:56:11

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Re: 420 specs in reply to staco, 10-27-2002 12:43:32

staco,

Four speed was standard, 5 speed was optional.

Here are the speed in gear specs for the 4 speed:

1 1.62
2 3.12
3 4.25
4 12.00
R 2.50

Rated RPM is 1850

Steve

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staco

10-27-2002 15:28:08

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Re: Re: 420 specs in reply to Steve - IN, 10-27-2002 13:56:11

thank for the reply. is this slower than a model A? would the 5 spd. have a slower 1st. gear?Is there a site on the net that has all these specs so I could do a comparison of one model to another?

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Steve - IN

10-27-2002 19:09:04

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Re: Re: Re: 420 specs in reply to staco, 10-27-2002 15:28:08

staco,

You're welcome. Model A covers a lot of ground, or I should say time. I can find only find info on the late model 6 speeds (the early A's were 4 speeds), which are similar to my 60 --

Gear Speed 1st 2.5 mph 2nd 3.5 mph 3rd 4.5 mph 4th 5.75 mph 5th 7.75 mph 6th 13.0 mph Reverse 4.0 mph

The most comprehensive single web site for 2 cylinder JD info I know of is Rummy's www.johnnypopper.com . But that doesn't have it all. You might be able to find archived info from the Nebraska tests at various sites, they do have speed info, but not all tractors were tested - and some they want to sell you the info.

If you really want to get overboard -- there's an auction on ebay now of a collection of over 1,000 old JD manuals. The bid is now at 761 dollars. Wow.

Steve

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