dot4 in when mineral oil needed

[ppea]

I buy a tractor that requires mineral oil in brakes or lhm and the owner before me uses brake fluid(dot3 or dot4).the tractor front brakes are oil bath type and when i run the tractor fast ,the brakes are hot but works perfect.the wheels are free.I think the dot4 ruin the seal.any ideas?

 

[oldnslo]

Dot 3 Brake fluid will ruin seals meant for mineral oil use. If my memory is correct it will cause the seal material to swell and or turn mushy.

 

[ppea]

Only dot 3 wil ruin the seal?

 

[oldnslo]

I should have stated both Dot 3 and 4 will ruin seals meant for mineral oil use. EPDM is seal material required for use with brake fluid while Nitril (buna n) or FKM (viton) is used for mineral oil.

Depending on how your tractor is made the DOT 3,4 brake fluid may not have made it to the wheel cylinder. It could be majority mineral oil still in the brake lines and wheel cylinders.

 

[ppea]

In tractor it was dot3 or dot4 when i buy it.I made same mistake and replace with the same dot4 and then i saw the front brakes are hot when i runing fast on road.I thing it's to late and the seal are damage already.

 

[RayIN]

Regardless; I'd flush the brake system ASAP and install the correct fluid. Might require new wheel cylinders and master cylinder too.

 

[ppea]

the problem is i didn't find the seal for front brakes.I try to put mineral oil and i hope to work.

 

[caver]

My Case backhoe specifically states hydraulic fluid. Not long after I bought it from a dealer both seals on the master cylinders started leaking. I suspect someone just topped it off with brake fluid. I ended up replacing both master cylinders as at the time I couldn't find a rebuild kit.

 

[LouNY]

It could be crud and rubber particles blocking the return from the master cylinders and maintaining just a bit of back pressure in the system,
Cleaning and flushing with the good mineral fluid may solve the problems.

 

[ppea]

I change to mineral oil but the brakes are still warm.The problem is i didn't find the seal.

 

[etpm]

I change to mineral oil but the brakes are still warm.The problem is i didn't find the seal.

Warm brakes sounds like they are dragging. Get the front wheel off of the ground and see if they turn easily. If they don't then try adjusting the brakes.
Eric

 

[ppea]

The wheels can be turn by the hand.It cannot be adjusted,it's a wet disc brakes.Can an incorect oil to be cause for heat? I don't know if it's corect oil in front axle.

 

[etpm]

The wheels can be turn by the hand.It cannot be adjusted,it's a wet disc brakes.Can an incorect oil to be cause for heat? I don't know if it's corect oil in front axle.

I apologize for not reading your original post again before making my post. I don't know anything about wet brakes but do know a bit about wet clutches and oil viscosity and heat. When a thick oil is forced to move, for example when it is stirred by brake discs, it will heat up more that if a thin oil is subjected to the same forces. So if the wrong oil is used in your brakes, if the oil is too thick, it could indeed get hot. Also, I know that different oils act differently when subjected to shear forces, such as would be encountered in a disc braking system. So the wrong oil could indeed run hotter than the correct oil.
Eric

 

[etpm]

I looked online for your tractor, the one you have listed in your profile, and the only tractor I could find was a two wheel tractor. This makes me think you are asking about a different tractor because you mention front wheels. Furthermore, looking at the specs for the tractor in you profile, there is no oil listed for the brakes. What tractor are you needing help with? I bet if you told us all there is a pretty good chance that someone with knowledge would be able to help. This site is a great resource.
Eric

 

[TractorTech]

Your tractor is a Case 1056xl?

 

[ppea]

I have a grillo ,case 1056xl and now i buy an valpadana 6575 isr-rev,what is it about.I the manual it says to use utto(Universal Tractor Transmission Oil)GL4 because it's ok to use when require a combined hydraulic, transmission, and final drive fluid with wet brake and power take-off performance.In the tractor i don't know what type of oil is in the front axle.It's only get hot when i run top speed after 1 km because the drive axle spin very fast .Today a wheel on the front almost block for a few second.The wheels i can rotate by hand if i lift the front of the tractor.

 

[TractorTech]

The seals on the front brake actuator discs are probably swollen from the Dot 3 fluid and may start working again after flushing with mineral oil, but not likely. The actuator disc should be located in the front hub. I don't know what axle a Valpadana 6575 uses, but I have attached a picture of a front hub from a Fiat/New Holland hub from a TN95A. The actuator disc is #5. The inner seal is #6, outer seal #7.

If you could post some pictures of the front axle and hub, it would help. Valpadana is part of Landini, so a Landini dealer may be able to help with parts.

 

[ppea]

i remove the seal and this is the cause.i find only the biger seal to buy.I think to put an o ring to replace the small one.

 

[ptsg]

Try an hydraulic shop. Maybe that have a one of those teflon piston seals that may work in your application.

 

[ppea]

Very small chances.