Green Tractor Talk banner
1 - 20 of 21 Posts

·
Registered
Joined
·
3,188 Posts
Discussion Starter · #1 · (Edited)
Like I said....Looking at a possible purchase..yep its 4x4.

When swapping from tall R1's to some Low pro Radials in a perfect world.

How do you know what size for front & Rear........I'm less than skeptical about trusting any of the current employees of Any tire store local to me.

I need to do this math myself w/Help of course.

It will be a spendy venture.....I don't think tractor Data lists gear ratio's for Front & Rear axlels.
Anyone know a source for this info...??


Heres the tractor.. https://www.tractordata.com/farm-tractors/001/5/7/1571-john-deere-5420.html

Factory R1's
John Deere 5420 Tires
Ag front:7.50-16
Ag rear:16.9-30


This tells me not much.
 

·
Premium Member
Early 2017 Vintage 1025R TLB (260/H120)
Joined
·
1,978 Posts
You need to find the distance traveled by the front and rear, per rotation, figure out the ratio of front to rear to ensure that any replacement tires are basically the same ratio to ensure that you're not introducing strain in the 4WD system. I'd be very suprised if there wasn't a published list of tires that can be run on that tractor.
 

·
Registered
Joined
·
83 Posts
You can download the owners manual for free from JD and that should have all the info for proper wheels and tires and also the combos for FWD.
 

·
Registered
Joined
·
3,188 Posts
Discussion Starter · #4 ·
I'm currently trying that...

I think I have to submit a DNA sample and a Positive Covid test to proceed any further...I'm making slow progress as they seem to call this a "Straddle Mount"..and pic shows an Up/Stack exhaust...something seems goofy.

New twist....Front axle has Planetary gears out at HUB......so even if I found Gear ratio F&R....Will it represent what it is to the tire or just the ring& pinion?

I'll continue to dig.
 

·
Premium Member
Joined
·
4,479 Posts
You should be able to research your current tires and obtain circumference of front vs rear.
Simply keep that ratio and you’ll be good.
Example
Let's say your fronts are 70" and your rears are 210", that would mean that your rears need to have a circumference that is 3 x the fronts.
So if your new fronts are 50" you'll need rears that are 150"
Did that make sense?
 

·
Registered
Joined
·
3,188 Posts
Discussion Starter · #6 ·
I'm not sure the tires on the tractor I'm looking at are correct.
They been changed to r4 fronts and huge turf rears.
I have yet to see the "factory" tires and wheels that apparently come with the tractor......Thats the ones I need to measure.
Owners manual is No Joy so far with any tire specs...still wading through it.... thanks Doc. :p
 

·
Registered
Joined
·
83 Posts
Nevermind, I see you received the manual. 🤓
 
  • Like
Reactions: theduke

·
Registered
Joined
·
3,188 Posts
Discussion Starter · #8 ·
Finally found this....took forever.

Tire Compatibility Chart—5420 and 5520—Early Model Tractor
NOTE:
Rear wheels have cast disks.
NOTE:
The following chart details which front tires are compatible with an available rear tire. Underneath each rear tire will be the compatible front tires, either 2-WD or MFWD, along with the compatible tractor model.
-: Tire Compatibility Chart—5420 and 5520

Model​
Tire Size​
5420​
5520​
Rear​
21.5L-16.1 6PR R3​
X​
X​
Front​
2-WD​
27/9.5-15 6PR I1​
X​
X​
27/12LL-15 6PR​
X​
X​
MFWD​
9.5-16 6PR R3​
X​
X​
Rear​
16.9-24 8PR R4​
X​
X​
Front​
2-WD​
11L-15 8PR F3​
X​
X​
MFWD​
12.5/80-18 10PR I3​
X​
X​
Rear​
16.9-24 6PR R1​
X​
X​
Front​
2-WD​
7.50-16 6PR F2​
X​
X​
9.5L-15 6PR F2​
X​
X​
11L-15 8PR F2​
X​
X​
MFWD​
8.3-24 4PR R1​
X​
X​
Rear​
16.9-24 6PR R3​
X​
X​
Front​
2-WD​
10.0-15 8PR I1​
X​
X​
27/12LL-15 6PR​
X​
X​
11L-15 8PR F3​
X​
X​
MFWD​
8.3-24 4PR R3​
X​
X​
Rear​
19.5L-24 10PR R4​
X​
X​
Front​
2-WD​
11L-15 8PR F3​
X​
X​
MFWD​
12.5/80-18 10PR I3​
X​
X​


-: Tire Compatibility Chart—5420 and 5520

Model​
Tire Size​
5420​
5520​
Rear​
13.6-28 4PR R1​
X​
X​
Front​
2-WD​
6.50-16 6PR F2​
X​
X​
7.50-16 6PR F2​
X​
X​
9.5L-15 6PR F2​
X​
X​
10.0-15 8PR I1​
X​
X​
11L-15 8PR F2​
X​
X​
MFWD​
8.3-24 4PR R1​
X​
X​
Rear​
14.9-28 6PR R1​
X​
X​
Front​
2-WD​
6.50-16 6PR F2​
X​
X​
7.50-16 6PR F2​
X​
X​
9.5L-15 6PR F2​
X​
X​
10.0-15 8PR I1​
X​
X​
11L-15 8PR F2​
X​
X​
MFWD​
9.5-24 6PR R1​
X​
X​
Rear​
16.9-28 6PR R1​
X​
X​
Front​
2-WD​
7.50-16 6PR F2​
X​
X​
9.5L-15 6PR F2​
X​
X​
11L-15 8PR F2​
X​
X​
MFWD​
9.5-24 6PR R1​
X​
X​
Rear​
16.9-30 6PR R1​
X​
X​
Front​
2-WD​
9.5L-15 6PR F2​
X​
X​
11L-15 8PR F2​
X​
X​
11L-15 8PR F3​
X​
X​
7.50-16 6PR F2​
X​
X​
MFWD​
11.2-24 6PR R1​
X​
X​


-: Tire Compatibility Chart—5420 and 5520

Model​
Tire Size​
5420​
5520​
Rear​
22.5LL-16.1 6PR Turf Special​
X​
X​
Front​
2-WD​
27/9.5-15 6PR I1​
X​
X​
27/12LL-15 6PR Turf Special​
X​
X​
MFWD​
12LL-16 6PR R3 Turf Special​
X​
X​
Rear​
18.4-30 6PR R1​
X​
X​
Front​
2-WD​
11L-15 8PR F2​
X​
X​
MFWD​
12.4-24 6PR R1​
X​
X​
Rear (Cast Wheels)​
15.5-38 6PR R1​
X [Not available in cab or isolated open operator station tractors.]​
X [Not available in cab or isolated open operator station tractors.]​
Front​
2-WD​
11L-15 8PR F2​
X​
X​
MFWD​
13.6-24 6PR R1​
X​
Rear - Veggie Tractors​
9.5R48 4STAR R1 [Tractors with Isolated Open Operator Station require 102 mm (4 in.) spacers.]​
X​
X​
Front​
MFWD​
9.5R32 4STAR R1​
X​
X​
All Tires - Hi-Crop Tractors​
13.6-38 6PR R2​
X​
 

·
Registered
X320, 3720 W/ 300cx loader, 5'ford 917 flail, CL 6' box blade,
Joined
·
87 Posts
7.5x16 front/16.9x30 rear Ag's, is what tractor data lists as coming on them factory
 

·
Premium Member
Joined
·
9,208 Posts
I would want as my first choice 16.9 30 rear 11.2 24 front R1s
 

·
Registered
Joined
·
3,188 Posts
Discussion Starter · #11 ·
I need Low pro replacements if I go with this machine.

Part of my concern is ....Is whats on it Now the correct height F&R to not damage the MFWD system.

Now for field work your supposed to have x amount of slippage......whatever . Whole big long chapter on that and how to determine "slippage"...Never knew it was a thing but JD says it is.

I'm not doing any field work...It will be loader work on gravel road type stuff...Its a half mile to any pavement and I see no reason to ever be there .
 

·
Premium Member
Joined
·
9,208 Posts
I need Low pro replacements if I go with this machine.

Part of my concern is ....Is whats on it Now the correct height F&R to not damage the MFWD system.

Now for field work your supposed to have x amount of slippage......whatever . Whole big long chapter on that and how to determine "slippage"...Never knew it was a thing but JD says it is.

I'm not doing any field work...It will be loader work on gravel road type stuff...Its a half mile to any pavement and I see no reason to ever be there .
I think what you are calling "slippage" is what JD calls "lead". You want the fronts to turn 1-5% faster than the rears, so they "lead" or slip, rather than the rears having to slip. The tire combinations JD offered should be in this range. JD may have expanded the range (1-5%) a little so as to only have to offer one gear ratio in the axles, rather than several ratios.

So if you were to determine the ratio of the rear to front tires (either loaded radius or circumference) of approved tire combinations. Then compare to the ratio for what is on it. If way off, it will either wear out the front tires quicker or possibly damage the MFWD.

If they are including the original R1 tires and wheels, isn't this mute point? Or are you concerned the MFWD has been damaged?
 

·
Premium Member
Joined
·
9,208 Posts
From the list you posted, are the rears 22.5LL -16.1 Turf Specials?
 

·
Registered
Joined
·
3,188 Posts
Discussion Starter · #15 ·
I never checked what size is on it.
I'll have to go through my pics and see if I got one.

The r1's are going to be too tall to deal with my hills here I fear.
I like the low and wide look and I'll fill all 4.

Story was The previous owner just used it to mow flat land..likely was in 2x4 but I want to know how close they got the combo as they been on there a while. Center of the rears are worn pretty good.

I found nothing in the manual about this Lead...but that makes perfect sense.
This Slippage was all about how much ballast to add to which end depending how much tire Spin /Slippage your getting pulling a ground engageing implement.
I'll see if I can find that page and drop it in here.

Checking for Correct Ballast
The best way to check for correct ballast is to measure amount of travel reduction (% slip) of the drive wheels. Under normal field conditions, travel reduction should be 10—15 percent.

Add more weight to drive wheels if slip is excessive. If there is less than 10 percent slip, weight should be removed.

Measuring Wheel Slip—Manually
M47166
M47166-UN: Measuring Wheel Slip—Manually
    • Place a mark (A) on a rear tire which is easily observed (a chalk mark is recommended).
    • With tractor working, mark a starting point (B) on the ground at the place where the tire mark (A) meets the ground.
    • Mark the ground again where the tire mark (A) completes 10 full revolutions (C).
    • With implement raised, return in the opposite direction. At the second mark on the ground (C) remark the tire (D).
    • While driving the tractor along the same path (implement raised), count the tire revolutions required to reach the starting point (B).
    • Use the return tire revolutions count and Wheel Slippage Chart to determine slippage. 10—15 percent for two wheel drive or 8—12 percent for MFWD engaged tractors is ideal.
    • Adjust ballast or load to give correct slippage.
      NOTE:
      Available horsepower is greatly reduced when wheel slip drops below 10 percent.
      -: Wheel Slippage Chart
      WHEEL SLIPPAGE CHART​
      Non-Loaded Wheel Revolutions (Step 5)​
      Estimated % Slip​
      Recommended Action​
      10​
      0​
      Remove Ballast​
      9-1/2​
      5​
      Remove Ballast​
      9​
      10​
      Proper Ballast​
      8-1/2​
      15​
      Proper Ballast​
      8​
      20​
      Add Ballast​
      7-1/2​
      25​
      Add Ballast​
      7​
      30​
      Add Ballast​
MX,BAIP,PA3-19-19960110
 

·
Premium Member
Joined
·
9,208 Posts
Ok, I thought you were calling "lead" slippage. Because the fronts will slip first.
I also doubt the use it saw hurt the MFWD. Mowing flat ground.
Your previous post from the JD owners manual list approved tire combinations. I saw several R3 rears listed.
See if you can find out what sizes if currently has. It may be that the R4 fronts were closest size to work with the chosen rear tires if the are a size not listed? I am guessing the rears are 22.5-16.1 R3 Turf Specials.
IIRC you said it has R4 Industrial front tires
I would want to know if the front wheels are the correct ones for replacement with the recommended R3 tire. If the R3 front tires need a 16" wheel and the R4 front tires are on 18" wheels you will also need new wheels.

Since R3 tires are what you want, price new tires all round, wheels if the fronts are wrong size, and consider this when negociating the price. Better to know this before you buy than after!
 
  • Love
Reactions: theduke

·
Registered
Joined
·
3,188 Posts
Discussion Starter · #17 ·
Yes Sir.

I'm trying to cover my but in every direction on this...gonna have to slightly finance a chunk of it creatively.

Going back by in a day or so and it will be time to talk if its still avl.

Learned lots so its not a total loss if its gone.

I think I've settled on this model or Era/yr tractor.....It seems to fit what I desire in a bigger machine.

Never have investigated the actual engine yet........No ones jumped out and said anything bad about a JD 4cyl and I've yet to stumble on any talk about engine troubles.
Hoping for the best......
 

·
Registered
Joined
·
73 Posts
Never have investigated the actual engine yet........No ones jumped out and said anything bad about a JD 4cyl and I've yet to stumble on any talk about engine troubles.
Hoping for the best......
The 276 cid 4 cylinder (aka 4045) is another one of Deere's engines they've been making since the 1970s and has an excellent reputation. We had essentially that same engine as in in the 5420 you are looking at in a 5410 and put a couple thousand hours on it without any issues, and then my dad has the turbocharged Tier III version in a 5083E and has put a couple thousand hours on it without any issues either.
 

·
Premium Member
Joined
·
9,208 Posts
My JD 6415 also has the 276ci 4045 engine. Close to 3000 hours and no problems. It's 85PTO HP and I've seen it list at 100, 104, and 108 gross HP. (in the 6415)
The only thing wrong with that engine in the 5420 is JD painted it black instead of green :D
 
  • Like
Reactions: theduke

·
Registered
Joined
·
73 Posts
My JD 6415 also has the 276ci 4045 engine. Close to 3000 hours and no problems. It's 85PTO HP and I've seen it list at 100, 104, and 108 gross HP. (in the 6415)
The only thing wrong with that engine in the 5420 is JD painted it black instead of green :D
Deere painted engines in their small frame utility tractors black instead of green when they changed from the 55 series to the 5x00 series in the early 1990s and continued the black engines through the 5x25/5x03/5x05 series in the late 2000s. They switched back to green engines when they changed the model designations from 5xxx to 5D/5E/5M.
 
1 - 20 of 21 Posts
Top