Wish we had a clutch....

   / Wish we had a clutch.... #12  
Not to pick a nit, but is that true that the oil is flowing thru the filter when tram is in "neutral"?
If it is a variable displacement pump (which I believe it is), there is no fluid flowing through it when it is in neutral.

Aaron Z
 
   / Wish we had a clutch....
  • Thread Starter
#14  
Not to pick a nit, but is that true that the oil is flowing thru the filter when tram is in "neutral"?

After you change the hydraulic filter, what's the next thing you're supposed to do?

Bleed the pump.

How do we bleed the pump?

We disconnect the spark plugs, stick the hose on the bleed port and the other end into the tank.

Then we crank the starter and watch the air bubbles.

Where are the air bubbles coming from?

Fluid being pushed through the pump.

The swash plate is in neutral.

Is my thinking incorrect? It has been many times before, so have at it if I'm mistaken. :)
 
   / Wish we had a clutch....
  • Thread Starter
#15  
If it is a variable displacement pump (which I believe it is), there is no fluid flowing through it when it is in neutral.

Aaron Z

I think the charge pump is constantly pumping.
 
   / Wish we had a clutch.... #16  
I think the charge pump is constantly pumping.
Most likely, but if the swashplate is in neutral the high pressure tram pump should not be pumping anything through beyond what the charge pump is pushing through.

Aaron Z
 
   / Wish we had a clutch....
  • Thread Starter
#17  
Wonder if they could run all the pumps out the back and through something like this, works on my chipper and it’s 140hp !
Mechanical Power Takeoff - Mechanical PTO | Twin Disc

My 2001 PT425 model year has pumps on both ends of the motor. I'm not sure which year, but several years after mine was made, they moved all the pumps to one end of the motor. So, yes, something like that would work very well, if it had all the correct bolt patterns, etc... and the tub might have to be lengthened to make it fit.

I'm not planning on making any changes to my machine. It's just a question I ponder every time I'm out there in sub-zero temps wondering if it's gonna start. It always starts. But I still wonder! :laughing:
 
   / Wish we had a clutch....
  • Thread Starter
#18  
Most likely, but if the swashplate is in neutral the high pressure tram pump should not be pumping anything through beyond what the charge pump is pushing through.

Aaron Z


If the swash plate is in neutral, no fluid is being pumped through the wheel circuits. The pump is still spinning, but the plate is in a neutral position. We agree on that much.

The charge pump is still pumping. It has no neutral position. It always pumps. I believe it's a fixed displacement pump. It can't be disengaged.
 
   / Wish we had a clutch.... #20  
Would a cold weather (low-vis) hydraulic oil make an improvement? or an oil heater ? or a higher CCA battery ?
 

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