Which way is up?: Tractor Tires  -- Tractor Maintenance Discussion Forum and Review Which way is up?: Tractor Tires -- Tractor Maintenance Discussion Forum

  parts   |   manuals   |   discussion   |   photos   |   podcast   |   reviews   |   specs   |   dealers   |   classifieds   |   contact   |   faq   |   myProfile   |   home          Login Now | Sign Up


FAQ:   What is a tractor?

Forum Index
New As Posted | Active Subjects



www.emerichsales.com - New & Used Equipment
          View Tractors For Sale!


www.partsbynet.com - Lawn and Garden Equipment Parts


Bernardsville Landscape Lighting
Click to Post a New Message!

Discussion Boards > Active Subjects > Messages as Posted > Tractor Tires Forum

Page [ 1 ] |
Reply | Pop Up Window Reply | Add PhotoAdd Photo
 03-30-2004, 12:49 Post: 81575
Toller



Join Date: Feb 2004
Location: Alabama
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 27
 Which way is up?

I have JD 970 that I just purchased.

The tires have been ballasted with water and anti-freeze.

I note that the book says to measure the tire pressure of ballasted tires with the valve stem at the bottom of the tire but notes a special guage is needed. The dealer/salesman says to measure the pressure with the stem up. His comment is that this is where the air is.

A nagging memory of a science class is telling me that the pressure will be the same either way. The simplest ought to be with the valve stem up. Why would the book say valve stem down?

Thanks.

Eric Johnson






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Technorati | Furl | Stumble This

 03-30-2004, 13:33 Post: 81577
kwschumm



View my Photos

View my Photos  Pics
Join Date: Feb 2003
Location: NW Oregon
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 5764

2
Filter by User
 Which way is up?

FWIW, my JD manual doesn't specify a particular orientation. Pressure wise I don't think it matters. I always check my filled tires with the stem up to minimize the amount of fluid that may squirt out. You should use a gauge that is approved for fluid filled tires. I bought mine at a nearby auto parts store for something like $8, but I live in a rural area. Stores in less rural areas may not carry them.






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Technorati | Furl | Stumble This

 03-30-2004, 14:30 Post: 81580
Murf

TP Contributor

View my Photos

View my Photos  Pics
Join Date: Dec 1999
Location: Toronto Area, Ontario, Canada
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 7007
 Which way is up?

Toller, the salesman would be correct if you needed to measure the air charge.

What you need to know is the total pressure on the tire. This is what affects load-carrying, ride, etc.

Since water alone is ten pounds per gallon this must be taken into consideration also. Calcium raises this even further.

Thus the valve must be at the very bottom to get the 'whole picture'.

Best of luck.









Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Technorati | Furl | Stumble This

 03-30-2004, 14:35 Post: 81581
shortmagnum

TP Contributor

View my Photos

View my Photos  Pics
Join Date: Nov 2003
Location: Wisconsin
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 848

2
Filter by User
 Which way is up?

If it was just air, it wouldn't matter for the few feet from top to bottom of the tire, but for a dense substance like water, even a few feet difference vertically will show increased pressure at the bottom. So it doesn't matter if you measure 4 ft deep in a lake or at the bottom of a 4 ft diameter tractor tube, the increase in pressure would be the same.
Dave






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Technorati | Furl | Stumble This

 03-30-2004, 14:38 Post: 81582
kwschumm



View my Photos

View my Photos  Pics
Join Date: Feb 2003
Location: NW Oregon
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 5764

2
Filter by User
 Which way is up?

Hey, learn something new every day here!






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Technorati | Furl | Stumble This

 03-30-2004, 17:54 Post: 81602
JParker

TP Contributor

View my Photos

View my Photos  Pics
Join Date: Oct 2003
Location: Richmond, VA
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 152
 Which way is up?

Ok, I didn't know that there were special gauges for fluid filled tires, so that was good new info. I'll have to look for one just for good measure, but I still like the idea of measuring just the air at the top.

2.31 feet of water = 1 psi. Calcium would be more dense, so it would exaggerate the effect. If you know the approximate height of water in the tire, why not just add the difference? For the 4 ft high tire example, 4/2.3 = 1.7 psi.

Is 1.7 psi going to make that much difference? My old stick type gauge isn't that accurate.

The Service manual calls for 20 psi in rear tires, so we are talking about around 10% variance. The Orange service manual for 7800, 2410, 2710, 2910 doesn't say anything about stem position that I have found.

Just my $0.02






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Technorati | Furl | Stumble This

 03-31-2004, 09:44 Post: 81697
DRankin



View my Photos

View my Photos  Pics
Join Date: Jan 2000
Location: Northern Nevada
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 5105
 Which way is up?

I agree. This isn't a nuclear submarine. All my manuals refer to air pressure, not water pressure. Air is at the top.... measure it there.






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Technorati | Furl | Stumble This

 03-31-2004, 10:21 Post: 81701
shortmagnum

TP Contributor

View my Photos

View my Photos  Pics
Join Date: Nov 2003
Location: Wisconsin
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 848

2
Filter by User
 Which way is up?

"THE BOOK says to measure the tire pressure of ballasted tires with the valve stem at the bottom of the tire..."

Can 2-3 extra PSI of pressure at the bottom of a tire from a high density Calcium solution cause problems? It's a free country. You make the call...






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Technorati | Furl | Stumble This

 03-31-2004, 17:48 Post: 81736
Peters

TP Contributor

View my Photos

View my Photos  Pics
Join Date: Feb 2002
Location: Northern AL
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 3034
 Which way is up?

If the tire is more than a foot in height then the pressure at the bottom of the tire, contacting the soil is different than the bottom. You might as well measure the top and calculate the difference.






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Technorati | Furl | Stumble This

 03-31-2004, 18:52 Post: 81739
JAZAK5



Join Date: Jul 2003
Location: coxsackie,ny
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster
Posts: 276
 Which way is up?

MY 790 MANUAL CLEARLY STATES TO MEASURE THE AIR PRESSURE ABOVE THE FILL LEVEL OR 12 NOON






Reply to PostReply | Quote Post Reply to PostQuote Reply | Add PhotoAdd Photo




Bookmarks: Digg It | Del.icio.us | Technorati | Furl | Stumble This

Reply | Pop Up Window Reply | Add PhotoAdd Photo


Page [ 1 ] |

Discussion Boards > Active Subjects > Messages as Posted > Tractor Tires Forum

Thread 81575 Filter by Poster:
DRankin 1 | JAZAK5 1 | JParker 1 | kwschumm 2 | Murf 1 | Peters 1 | shortmagnum 2 | Toller 1 |




Most Viewed

+ Filling rear tractor tires with antifreeze
+ Tractor Tire sizes - what do those numbers mean
+ I hate my R4s, part II
+ Valve stem trouble on calcium filled tires
+ AG vs. Industrial tires
+ Galaxy tires?
+ Tire Chains
+ Rubber Tire Chains
+ foam filled turf tires pros and cons
+ Turf or R4 tires for snow

Most Discussion

+ I hate my R4s, part II
+ Filling rear tractor tires wit
+ Tire Chains Revisited
+ mixed R4 tires and PSI
+ R4 tire tears scuffs turf lawn
+ Chains: The Further Adventures
+ Average life span for turf tir
+ More tire chain questions
+ checking air pressure
+ Water Filled Tires

Newest Topics

+ 5100 front tires
+ 5100 front tires
+ Tractor Loaded Tires Short Weight
+ CubCadet 7532 Front Tire/wheel change
+ Ford 2120 Rear Rims
+ TIRE WEIGHTS
+ Tire Chains and Tensioners
+ Studding Tires
+ Rubber Tire Chains
+ Load tires to stop leaks??







Turbochargers for Tractors and Industrial Machines
Cab Glass for Tractors and Industrial Machines

Alternators for Tractors and Industrial Machines
Radiators for Tractors and Industrial Machines

Driveline Components for Tractors and Industrial Machines
Starter Motors for Tractors and Industrial Machines