Rear Tire Pressure

I noticed the rear tires on my one-eighty looked a little low.  I have a Milton tire gauge that is for water/fluid tires, which the one-eighty has.  I filled the tire up to 12 to 15 psi per this gauge, but as it seemed to be taking quite a while I wondered if this gauge was working properly.  I used my regular tire gauge (non fluid gauge) and it indicated 25 psi.  I am comfortable with the 12-15 psi, but until I get a new fluid gauge to double check things, will 25 psi in a rear tire do any damage?  Thanks, Dave

Dave, I can't count how many of those liquid gauges I have tossed in the grader ditch while driving the tire service truck from job to job. We never found a brand that lasted very long. I always had a half dozen new ones in the truck. When they get bad, they do exactually as you stated. There is some misinformation being stated here. If you have the right equipment, you can fill a rear tractor tire 90% full with no problems. I don't know what size tires you have on the tractor. If they are 18.4X30 or 18.4X28 18 lbs is the correct pressure to run in them, that is for bias ply tires. Radials can run up to 5 lbs lower pressure. You can go lower than those pressures but you defiantly run a risk of destroying the sidewalls in your tires. I can't recommend you run them lower than that, I've seen too many rears with decent tread destroyed because they were ran too low. When you are done checking the air/fluid in your tires, stick the business end of your air/water gauge in a pan of water or something like WD40 and pull the gauge out and in several times. This will rinse out the inside of your gauge. I always had a gallon or 2 of WD40 at the shop and would stick the business end of the gauge in that and pull it out and in. It seemed to help them last a little longer.

Is there a risk with too much pressure in the tire?