Craftsman Tractor 917.256890 Hydro Gear

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  #1  
Old 03-21-11, 01:40 PM
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Craftsman Tractor 917.256890 Hydro Gear

Hello all. Hello Cheese.

Now that Im hopefully over my carb leaking issue Id like to ask about the Hydro Gear in that tractor. Its a 1996 Craftsman model 917.256890 and Ive never had any problems with the functioning of Hydro Gear. But when I went to pull it out of the garage a few weeks ago afteer it leaked gas I noticed a pretty good oil puddle under the Hydro Gear. I dont recall anything like that in the previous 15 years.

According to my tractor owner manual the Hydro Gear is model 310-0500. How do I tell if the unit now has enough oil in it? Do I (or should I) pull the unit out of may tractor to see where it leaking? Can the leak be repaired without tearing the unit down? What type and how much oil does it take?

Thanks
Paul
 
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Old 03-23-11, 05:45 AM
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Anyone know about the Hydro Gear?

Thanks
Paul
 
  #3  
Old 04-10-11, 10:40 AM
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If either of you guys find a written explanation, I'd like a link to it.
I'm all over the net looking for the "How it works" file. Even Wiki is sorta Mum on that.

My understanding is a big oil pump. Engine driven, with a Differential gear.
But what is the Pump part?
In the parts diagram, it looks like a Six piston pump. Similar to a High Pressure water pump.
I dont see the Gear shift, or the Brake.
I dont see how the lever makes more oil pressure for higher speed.

It's an interesting thing to behold.
Leaks are just that. Something separated and lets oil out.

Do the "PURGE" function listed in the manual and see if that dont get your pressure back.
 
  #4  
Old 04-10-11, 06:37 PM
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Paul,

It takes synthetic 20w-50 oil. Hard to know where it could be leaking from, maybe an axle seal.

Hoary, the pump controls fluid flow by the lever with a swash plate. The lever tilts this plate which pushes the pistons further in their cylinders, moving more or less fluid, depending on the angle of the swash plate. If the plate is flat (neutral), the pistons don't move at all.
 
  #5  
Old 04-10-11, 08:12 PM
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Now that is interesting.
It seems right.
I had been given a Pressure washer and figured out how that worked.
Thanks for the Heads up.
 
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