Tires 790 tire pressure/flat

   / 790 tire pressure/flat #1  

F350Lawman

Gold Member
Joined
Jul 5, 2003
Messages
477
Location
Goshen, NY
Tractor
JD 790
What are you guys running in your 790s with FEL and R-4s. My tires seem rock hard. The sidewalls on the front deform slightly with a load in the bucket and hitting bumps but I don't think the rears ever flex. I think they are 30 or 36 lbs. in the rear because it had some chalk writing on it when it was delivered Saturday. I wanted to get some opinions before I check the pressure and possibly adjust.

I also got my first "flat" today. Well not really flat but a roofing nail in my R-4s that I removed and plugged with a rubber plug. Looks good so far. It has hard ramming a plug through those puppies especially since the nail ran crossways through part of a lug. /forums/images/graemlins/frown.gif

5 days and already 19 hours on the clock. 90% FEL/ real nasty brush. Plenty of power I was bulldozing large piles of brush clear across the field for burning. It's a beast for it's size. I am learning how to maximize downforce to avoid spinning. Even with the LX-5 hanging out back it still has much more torque than traction. No problems with mud, with the rain it has been pretty nasty. Had to rock myself out twice of mud up to the rims but it was real easy to unstick even without using the FEL. This was pretty bad so I am pleased with it's ability to traverse the mud. Might be that the lack of weight actually helped as it didn't bog REAL deep.

Tractor is great other than the nail /forums/images/graemlins/shocked.gif
 
   / 790 tire pressure/flat #2  
30 or 36 psi sounds way to high. I dropped my R4's on my tractor (Kubota L3830) to 15 psi on the rears, 20 PSI in the fronts. Your manual should clearly spell out your pressures for you. If not, consider 20 PSI max in the rears and 20 PSI in the fronts for starters. Your tractor has neither the weight or power to begin worrying about overloading or spinning a rim. Rat...
 
   / 790 tire pressure/flat #3  
On a JD 4610 with R4s, the manual calls for 45 in the front and 28 for the rear. Don't know about the 790.
 
   / 790 tire pressure/flat
  • Thread Starter
#4  
Thanks guys.

I WOULD go check the manual while John Deere may make good tractors they CAN"T get things correct in manuals or ads.

They don't have the R-4s listed in the manual. In fact they don't have a size listed that corresponds to ANY of the tires nor do they indicate WHAT tires they are talking about????

The sidewall says 30 lbs. max and that is what the dealer did. I am going to try 20 -15 and see how they look and feel.
 
   / 790 tire pressure/flat #5  
My opinion is to run as low a pressure as you can. The Michelin website explains the benefits of running the tires at lower pressures. Compaction being a huge part of it. Traction is also enhanced. You might want to experiment a little. The 30 lbs max may very well be the max seating pressure allowed. Rat.
 
   / 790 tire pressure/flat
  • Thread Starter
#6  
I will try 15lbs. With the light tractor that should work.
 
   / 790 tire pressure/flat #7  
<font color="blue">( You might want to experiment a little. ) </font>

I agree with Mark...

If you intend to use the loader alot on a particular day... then increase the pressure on the fronts only (most stress placed)... reduce later when done...
 
   / 790 tire pressure/flat
  • Thread Starter
#8  
Yes, I will. The fronts seem OK I think they are at 23. I see them flex slightly with a full load in the loader so I will only go down to 20. The rears are like stone at 30 so I am going to try 15. I will monitor and adjust accordingly.

As you suggetsed I will go as soft as possible in and then air up the fronts if I am moving gravel or some other heavy material.

Have the same situation with my truck and the dual rear wheels. If I am fully loaded I run max pressure 80lbs unloaded I run 40 lbs or else the tires wear only in the middle.
 
   / 790 tire pressure/flat #9  
The JD manual on my 1998 770 (essentially the same tractor) with 12.4-16 R4 rear tires shows minimum of 12 PSI, maximum of 16 PSI. With 6.00-12 R-4 front tires shows minimum of 15 PSI, maximum of 26 PSI. These are for 4 Ply tires. Just for reference, the manual lists the approximate gross tractor weight with MFWD at 2,150 lbs.

The manual said "Minimum pressures may be used only for light loads and only if tractor has no added weight. If you install ballast or mounted implements, or if you pull heavy loads, increase pressure." "If tires contain liquid ballast, use a special air-water gauge and measure with valve stems at bottom."

Interestingly: The specifications are not in the specifications section, but under the 50 hour service section in a box called CHECK TIRE INFLATION.

A great tractor, but the manuals look like they were photocopied because they ran out of originals. Not too impressive.

Hope this is a helpful point of reference for you.
 
   / 790 tire pressure/flat #10  
I do not have a loader (yet), and I run my tires at 12 psi front and rear. I am afraid to go lower but they still are fairly hard.When I run thriugh water and then pavement the tread looks like it is contacting across full width, (it did not with higher pressures). I also have turned my front wheels around with the blessing of the dealer, and as of now no ill effects.
 

Tractor & Equipment Auctions

2025 Kivel 48in Forks and Frame Skid Steer Attachment (A50322)
2025 Kivel 48in...
2019 Ford Explorer AWD SUV (A50324)
2019 Ford Explorer...
2018 Nissan Pathfinder SUV (A50324)
2018 Nissan...
LINK BELT LB-98 LOG LINE YARDER WITH MOTORIZED CARRIAGE (A51222)
LINK BELT LB-98...
2020 CHEVROLET Z71 TEXAS EDITION TRUCK (A51406)
2020 CHEVROLET Z71...
2015 FORD F750 26FT BOX TRUCK (A51219)
2015 FORD F750...
 
Top