Skid steer snow blower on tractor loader?

   / Skid steer snow blower on tractor loader? #131  
See if the relief valve is adjustable as GRS said. That would be the first thing to try. That crushed hose could well be an issue too and you may want to consider replacing that in any case. I know it is a pain but it would be good to see the flow and pressure at a couple points in the system. Not sure where you have it now, but I would want to see it right after the pump, before the relief valve, as well as right after the relief.

You sure the pump is getting good fluid supply too? Fluid level good, tank pickup not clogged?
 
   / Skid steer snow blower on tractor loader?
  • Thread Starter
#132  
The steering issue may need chains to fix. I chain up all 4 tires on my tractor so i can use plow anyways.

not sure on problem with your pressures. Mine pumps at about 3,000 psi, 15 gpm. It will bog a bit with real wet snow, but hardly ever jambs with snow. And throws snow very far.

there is an adjustable pressure bypass on snow blower itself.
Thanks.

Erskine doesn't publish the hydraulic schematics, so I have had to piece a few things together as best I can. Some comes from the manual and parts diagrams, and some comes from a discussion with Erskine. It appears that the fan and auger motors are plumbed in series with the fan first in line. So the fan is relieved by the main pressure relief in the hydraulic power pack. Fluid then flows out of the fan pump and into the auger pump, but there is in intervening auger relief valve that is part of the hydraulic block on the blower. That provides protection in case the auger picks up a rock or branch and jams. The manual says to adjust the auger relief only if the auger is stalling prematurely. Since at the moment my issue appears to be with the fan and main power pack relief valve, that's where I'm focused at least until I fix this particular problem.
 
   / Skid steer snow blower on tractor loader?
  • Thread Starter
#133  
See if the relief valve is adjustable as GRS said. That would be the first thing to try. That crushed hose could well be an issue too and you may want to consider replacing that in any case. I know it is a pain but it would be good to see the flow and pressure at a couple points in the system. Not sure where you have it now, but I would want to see it right after the pump, before the relief valve, as well as right after the relief.

You sure the pump is getting good fluid supply too? Fluid level good, tank pickup not clogged?
Unfortunately the main relief valve is fixed at 3000 psi.

I will definitely replace the crushed hose - probably early next week. But at the moment I don't think it's a problem since when I haven't jamed the fan so it can't turn, I have good fluid flow on my flow meter, and there is no detectable back pressure.

My pressure gauge and flow meter are currently immediately does stream of the pump and main relief valve. That's how I know that the problem is either the pump unable to develop pressure, or the relief letting go too soon. The next location for the flow and pressure meters will be immediately after the pump, as you say. And this time with a working adjustable flow restrictor to I can put a load just on the pump to see if it builds pressure. That should tell me if it's a pump or relief valve problem.

I think the fluid supply is good, again, because I saw good flow when there is no load on the snow blower. The tank is full, raised above the pump, and it's a 1-1/2" hose on the supply side. And the machine in inside a heated shop at 60F, so I'm not pumping molasses.
 
   / Skid steer snow blower on tractor loader? #134  
Unfortunately the main relief valve is fixed at 3000 psi.

I will definitely replace the crushed hose - probably early next week. But at the moment I don't think it's a problem since when I haven't jamed the fan so it can't turn, I have good fluid flow on my flow meter, and there is no detectable back pressure.

My pressure gauge and flow meter are currently immediately does stream of the pump and main relief valve. That's how I know that the problem is either the pump unable to develop pressure, or the relief letting go too soon. The next location for the flow and pressure meters will be immediately after the pump, as you say. And this time with a working adjustable flow restrictor to I can put a load just on the pump to see if it builds pressure. That should tell me if it's a pump or relief valve problem.

I think the fluid supply is good, again, because I saw good flow when there is no load on the snow blower. The tank is full, raised above the pump, and it's a 1-1/2" hose on the supply side. And the machine in inside a heated shop at 60F, so I'm not pumping molasses.
I am a little confused. You have a 24 gpm/3000psi pump thats showing 6 gpm/0 psi at full pto rpm and with the fan motor blocked?
 
   / Skid steer snow blower on tractor loader?
  • Thread Starter
#135  
I am a little confused. You have a 24 gpm/3000psi pump thats showing 6 gpm/0 psi at full pto rpm and with the fan motor blocked?
Sorry for the confusion. The engine is at idle or slightly above, and the fan and auger are rotating freely when I see 6 gpm and 0 psi. I think that tells me there are no serious flow restrictions in the system.

Then with the fan blocked and again at idle or slightly above, I get 0 gpm and 1000 psi. I think I should get 0 gpm and 3000 psi, and perhaps even stall the engine. I then increased rpms to see if pressure would build and it momentarily climbed to 1500 psi, but then back down to 1000 psi. Since my pressure gauge is immediately after the pump and main relief valve, I think it tells me that either the pump is unable to develop pressure, or the relief valve is releasing prematurely.
 
   / Skid steer snow blower on tractor loader?
  • Thread Starter
#136  
It's the pump. I hooked up my flow meter, gauge, and restrictor immediately at the outlet of the pump. With engine at idle, no load but the blower rotating, I get 10 gpm and barely detectable pressure. That's normal. But when I apply load to the pump by restricting flow, it couldn't develop more than 500 psi, even when completely dead headed.

So I pulled the pump apart and indeed it's trashed. Take a look at the attached pictures. I think teh housing it too damaged to even attempt a rebuild, so I'll be getting a new pump. Now I just need to figure out what it is. I did finally find some numbers on it and an embossed "Eaton", so with that I suspect I can figure it out.

If anyone had any pump rebuild experience, I'd be real interested in a read on what might have caused this damage. Because this power pack has no active cooling, and relies solely on ambient temp and operator attention to prevent overheating, I think overheating is a distinct possibility. So I'm particularly interested in whether this could have been caused by overheating. I guess the other possibilities are cavitation or contamination.
 

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   / Skid steer snow blower on tractor loader? #137  
All i know is when i purchased my unit new in 2010, the original pto pump failed after 2 years use. It leaked like a sieve. I contacted quick attach and they told me they had issues with the pumps from my series and if i shipped the old one back on their dime, they would send me the updated version. That was 8 years ago and this one works flawlessly. Ill go see if i can find a brand or part number on it later today. But mine is only 15 gpm pump. And its extremely heavy
 
   / Skid steer snow blower on tractor loader? #138  
Here are a few pics pf the thing.
 

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   / Skid steer snow blower on tractor loader?
  • Thread Starter
#139  
All i know is when i purchased my unit new in 2010, the original pto pump failed after 2 years use. It leaked like a sieve. I contacted quick attach and they told me they had issues with the pumps from my series and if i shipped the old one back on their dime, they would send me the updated version. That was 8 years ago and this one works flawlessly. Ill go see if i can find a brand or part number on it later today. But mine is only 15 gpm pump. And its extremely heavy

That's very interesting and might be related to the problem I have. It would be super helpful if you can get any number off your pump. Mine is an aluminum body, and perhaps they switched to a cast iron body. That would also explain the difference in weight. My pump isn't rebuildable, so if I'm replacing it, I'd like to replace with something good.
 
   / Skid steer snow blower on tractor loader?
  • Thread Starter
#140  
Here are a few pics pf the thing.
That's a different step-up gear from what I have. Did they replace just the pump, or the whole pump+step-up gear assembly?

Below is a picture of my pump plus gear. Also a picture of the model number etched into the pump mounting flange, and a picture of where it would be located on your pump, except it's probably on the underside of the flange in the corresponding location. That's where mine was.
 

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