When a gear tractor reaches 1000's of hours it needs a clutch; what does a HST need?

[MA1920]

My 1920 is only two years newer than yours.
Great machine....I will NEVER sell it!

The 1920's are nice machines. I don't see myself selling or trading for a new one. Just too expensive. Like with cars/trucks, it's usually "cheaper to keep her."

 

[dsgsr]

I've had 5 tractors in 21-yrs. three new and 2-used. All but one were hydro's. No problems if taken care of. I put 6700 hrs. on one of those tractors.

David

 

[atsah]

I change out the hydro filters and oil every 150 hours, that's about every two years for me, I don't expect I will ever have a HST issue. I would think a well taken care of HST tractor will last many years and several thousand hours without issues unless there was something wrong with it to begin with..

 

[MHarryE]

Hydros need clean oil operating in the right viscosity range. Viscosity is temperature sensitive and I haven’t seen any tractors with high temperature alert warnings. A partly plugged oil cooler coupled with hard work can reduce life significantly. Of course cleanliness is extremely important but new oil can be the dirtiest a tractor sees so filtration is extremely important. At our plant, every machine hydrostatic, we checked oil cleanliness before shipping. If it didn’t meet a certain ISO cleanliness level, we attached a kidney loop and cleaned until the oil exceeded the required cleanliness, then installed a new filter before shipping. Shuttling back and forth - should have no effect on life as long as oil is clean and in the right temperature range, and is quality oil. Lower quality oil that meets specs when poured out of its container can break down in a short period. There is no standard that labeling is required stating this oil meets standard JDxxx as shipped but if run 100 hours will shear down to the equivalent of water. Expensive equipment often has monitoring built in. An example is monitoring airplane incident reports. Nearly every day airliners need to shut down an engine and land early because the oil monitor indicator indicated oil exceeded a set level and the engine needed to be shut down. That type of system is used on a $5 million off highway mining truck but is too costly for a CUT. So we CUT users rely on servicing by the book. It’s also up to the user in selecting oil and filters. Me - I have an I-R temp gun on every piece of equipment and monitor the hydro oil filter temp because in my work life, the only premature failures I saw were due to overheating systems resulting in piston slippers melting. We did have much better filtration than I see on any CUT and customers who depend on equipment running for a living do not cut corners and buy low quality oil. If anything they change out factory fill for very high quality synthetic.

 

[fried1765]

Hydros need clean oil operating in the right viscosity range. Viscosity is temperature sensitive and I haven稚 seen any tractors with high temperature alert warnings. A partly plugged oil cooler coupled with hard work can reduce life significantly. Of course cleanliness is extremely important but new oil can be the dirtiest a tractor sees so filtration is extremely important. At our plant, every machine hydrostatic, we checked oil cleanliness before shipping. If it didn稚 meet a certain ISO cleanliness level, we attached a kidney loop and cleaned until the oil exceeded the required cleanliness, then installed a new filter before shipping. Shuttling back and forth - should have no effect on life as long as oil is clean and in the right temperature range, and is quality oil. Lower quality oil that meets specs when poured out of its container can break down in a short period. There is no standard that labeling is required stating this oil meets standard JDxxx as shipped but if run 100 hours will shear down to the equivalent of water. Expensive equipment often has monitoring built in. An example is monitoring airplane incident reports. Nearly every day airliners need to shut down an engine and land early because the oil monitor indicator indicated oil exceeded a set level and the engine needed to be shut down. That type of system is used on a $5 million off highway mining truck but is too costly for a CUT. So we CUT users rely on servicing by the book. It痴 also up to the user in selecting oil and filters. Me - I have an I-R temp gun on every piece of equipment and monitor the hydro oil filter temp because in my work life, the only premature failures I saw were due to overheating systems resulting in piston slippers melting. We did have much better filtration than I see on any CUT and customers who depend on equipment running for a living do not cut corners and buy low quality oil. If anything they change out factory fill for very high quality synthetic.

"nearly every day airliners need to shut down an engine and land early because the oil monitor indicator indicated oil level exceeded a set level and the engine needed to be shut down."

REALLY ???

Where the he!! did that information come from?

I spent 38 years flying large passenger aircraft, and have 33,000 hours of pilot time.
Never experienced such a condition.

 

[Teachu2]

If I owned a hydro, given my 80 or so hours/year use, I'd buy a rebuild kit and stash it away in the back of the pantry. That way, if I need one in the next twenty years, I wouldn't have to worry about availability. And because I had the parts on hand, it would never need them!

 

[Industrial Toys]

What do you do, if you own a bunch? If I hoarded the parts, I would without a doubt, find out I bought the wrong ones, or my model was the only one that didn't use the usual parts.

I use JD low visc hyd oil in all my hydrostats and JD6200.

 

[LouNY]

If I owned a hydro, given my 80 or so hours/year use, I'd buy a rebuild kit and stash it away in the back of the pantry. That way, if I need one in the next twenty years, I wouldn't have to worry about availability. And because I had the parts on hand, it would never need them!

Lets see a little B7100, complete hydrostaic $ 8500.00
The drive and driven piston sets only $ 1700.00 each so times 2
Then a quick look at a L5740 main hydro $8500 piston sets don't look to be available.

Then a M4500 with a dual disk clutch;
complete unit $2155

I know I can split and replace a clutch,
I have rebuilt automatic transmissions,
I would be leery of trying to rebuild a hydro even if you can locate all the parts,
I piece of grit or dust blows into those servo and pistons you have wasted a lot of money and time.
clutch disc $460-560 each times 2

 

[Teachu2]

Lets see a little B7100, complete hydrostaic $ 8500.00
The drive and driven piston sets only $ 1700.00 each so times 2
Then a quick look at a L5740 main hydro $8500 piston sets don't look to be available.

Then a M4500 with a dual disk clutch;
complete unit $2155

I know I can split and replace a clutch,
I have rebuilt automatic transmissions,
I would be leery of trying to rebuild a hydro even if you can locate all the parts,
I piece of grit or dust blows into those servo and pistons you have wasted a lot of money and time.
clutch disc $460-560 each times 2

I didn't make the statement as a recommendation for folks with different circumstances. I bought my current tractor with the intent of it being my last - and it's still my intent. I merely stated that IF I'd bought a hydro for remaining lifetime use, I'd buy the parts to rebuild the hydro. As far as screwing up a rebuild, I'm already past the stage in my life where I would attempt such a project. It would be a shame to junk a tractor with 2000 hrs because the mechanic couldn't get parts.

 

[LouNY]

I didn't make the statement as a recommendation for folks with different circumstances. I bought my current tractor with the intent of it being my last - and it's still my intent. I merely stated that IF I'd bought a hydro for remaining lifetime use, I'd buy the parts to rebuild the hydro. As far as screwing up a rebuild, I'm already past the stage in my life where I would attempt such a project. It would be a shame to junk a tractor with 2000 hrs because the mechanic couldn't get parts.

I can understand that.
But I will also say that of numerous tractor dealership and independent tractor repair shops I have been in,
I can not think of a single one I would be comfortable having them rebuild a hydro. A few of the mechanics yes, but they do not have a clean enough facility.
Replacing one OK, but I also know that is should have a drain and refill after just a couple of hours on it from airborne dirt and dust.