O-rings

[mgbk1200rs]

Hello, I have a ford 1900 tractor 4x4. There will be lots of questions, But not all at once, The major problem is cleaning etc, I have a few leaks in the loader controls, are they hard or easy to repair? Yes, that is a dumb question, we own british cars I can rebuild SU carbs, heads, do tune ups, adjust valves, and all the MG type problems. The major questions, are the o-ring metric or standard, is there a kit I would need to order, Yes we have an owners manual,shop manual and a parts catalog. But a little help increases my confidence and save me money. Thanks Mike

 

[Bigfoot62]

Given your stated experience, spool valves should not be all that difficult for you to rebuild. Now, having said that, I will tell you that the success rate may not be that good. You're looking at a valve that's over 30 years old. There could be pitting, and will likely be wear. So, a rebuild will be somewhat of a gamble. Typically, I will try a rebuild first, before I replace. The rebuild kits are usually much less expensive than a new valve.
Your NH dealer will have the rebuild kits. (assuming it's a Ford loader) There are probably aftermarket kits too, but I'm not sure.

 

[J_J]

The truth is that there is not much one can do to to rebuild a spool valve.

The spools are a precision fit and if they wear, they leak and there isn't much you can do.

The O-rings on the spools are not there to keep pressure/fluid in, they are there to keep dirt and crud out of the spool.

You can try the o-rings if the spool has them, and see if they help reduce the leakage.

Some people try and use any o-ring that looks similar, but I would recommend you get the factory parts if possible. With worn or no o-rings, a good hyd tech can generate the correct size o-ring by carefully measuring the bore, and indentations on the spool.

O-rings come in different material. Buna N O-Ring, Viton® O-Ring, Bonded Seal (Viton).


O-Rings and Seals > Discount Hydraulic Hose.com


The manufacturers have a leak down rate to say a valve needs replacing. It might be 10 drops per min or whatever.

You can get a new loader valve for about $250

2 SPOOL COMPACT 10 GPM JOYSTICK CONTROL VALVE