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John Deere X300 K66 Upgrade project

146K views 132 replies 31 participants last post by  stladrill 
#1 ·
So guys I decide to go forward whit the project to replace the K46BR3 on my X300 with a K66Y.

I know some of you have objection and concern about the warranty of the tractor, please be advise I’m doing that for me and do not advise anyone to do it.

If you decide otherwise be advice that I strongly recommend that you wait until your warranty expired.

Disclaimer: this thread is for information only.

I receive it this afternoon, NOS K66Y ($300.00 CDN at my door step)

I inspect it and everything seam OK at first look, tomorrow I will test it on bench.

First I will replace all the oil and make the purge procedure, like usual I will document my progress all along.

Enjoy :)
 

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#4 ·
Re: John Deere X300GT project

Looks very interesting:thThumbsU Are you going to put new rims & 23x10.50 on the rear or keep the X300 with whats on there already,
 
#10 ·
Re: John Deere X300GT project

Looks very interesting:thThumbsU Are you going to put new rims & 23x10.50 on the rear or keep the X300 with whats on there already,
Yes I will change the rim to put the recommend tire size (23x10.50-12)

In fact it's already in order at John Deere (suppose to be there tomorrow)

The tire I plan to install are HDAP or Lug, I did not decide yet.
 

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#5 ·
Re: John Deere X300GT project

I believe he will be changing the rims to a 12" version for the 1" shafts (from a G110) but not sure if he has decided on tires yet.
 
#11 ·
Re: John Deere X300GT project

:goodl:
 
#13 ·
Re: John Deere X300GT project

I am very much looking forward to following this thread. Can't wait to see what needs to be done to make this happen.

Actually, I propose that this be a sticky already!
 
#17 ·
Re: John Deere X300GT project

according to jdparts.deere.com the hitch plate is 125.00 US. but it would give the ability to also add the sleeve hitch, which the X300 hitch does not.
Yes I know, I'm not gone a change it if I don't need to because of my rear blade mechanism, it will not give me any advantage.

If I was to put a sleeve hitch I would change it for sure to have all the attachment possibility.
 
#18 ·
Re: John Deere X300GT project

This thread is like watching your favorite TV show and anxiously waiting for the next episode. No pressure Stladrill!
 
#19 ·
Re: John Deere X300GT project

So I perform the bench test and do a meticulous inspection of the K66Y.

The oil reservoir add some sort of very small crack on it and the seal was crack to so I order new one at Tuff Torq

My parts from John Deere as arrive (rims, clips, sleeve,,,) I'll pick them up tomorrow

Here you will see the forward/reverse action with the lever position,
It is not “reverse logic” like the K66R transaxle.

Video link http://www.youtube.com/watch?v=UUpzjSz4Nzo
:rauch10:
 

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#20 ·
Re: John Deere X300GT project

That's too bad the oil resevoir was cracked. Looks good though. Of course I know the tractor is going to move faster than the shaft was moving in the video.
 
#21 ·
Re: John Deere X300GT project

That's too bad the oil reservoir was cracked. Looks good though.
The reservoir is not expensive ($10.00) and it's better to be safe then sorry.

Of course I know the tractor is going to move faster than the shaft was moving in the video
Can you imagine we could drive our tractor with a cordless drill. :sidelaugh
 
#23 ·
Re: John Deere X300GT project

OK back to business.

The k66Y pulley come with a different diameter and thickness, so to keep the original ratio (speed) between the motor and the tranny I have to install the K46 pulley

At the same time keep they original belt that come with the X300
 

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#26 ·
Re: John Deere X300GT project

What would happen if you used the K66 pulley? Would you just have to get a different belt? Would it go faster?
 
#29 · (Edited)
Re: John Deere X300GT project

What would happen if you used the K66 pulley? Would you just have to get a different belt? Would it go faster?
The pulley of the K66Y is smaller (4.27) (the K46 is 4.9) so theoretically they input shaft will go slower and she is larger so that will mine to change the engine pulley to have a matching set for the belt.
 
#27 ·
Re: John Deere X300GT project

I`m thinking that your new 66 needs to be driven at it`s original design speed in order to perform properly. If I`m following correctly, you have installed the larger stock pulley from your 46. which will slow down the impeller. Assuming that both engine drive pulleys are the same, won`t this translate into lower ground speed and perhaps decreased power / hyd efficiency ?
 
#30 ·
Re: John Deere X300GT project

I`m thinking that your new 66 needs to be driven at it`s original design speed in order to perform properly. If I`m following correctly, you have installed the larger stock pulley from your 46. which will slow down the impeller. Assuming that both engine drive pulleys are the same, won`t this translate into lower ground speed and perhaps decreased power / hyd efficiency ?
The spec input speed of the K66 is 3400 RPM and 3000 RPM for the K46

So the way I did it they input shaft will turn 400 RPM less It is better then going to fast, slower a bit will not brake the internal part in the tranny but going faster is always risky
 

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#28 ·
Re: John Deere X300GT project

How did you release the internal brake? Without the drill power, can you turn both sides of the axle the same direction by using your hands?
 
#37 ·
Re: John Deere X300GT project

How did you get the nut off the input shaft to change the pulley, is there a way to lock the shaft ?
 
#41 ·
Re: John Deere X300GT project

:ditto: :ditto: :ditto: :ditto: :ditto:
 
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