Flow/PSI Chart Hydrostatic subcompact FEL

[3RRL]

Perhaps your dealer's service department can tell you the test pressures for the charge pump circuit. If they tell you it is in the 300-400 psi range, then it is likely that the charge pump is being used for the auxiliary hydraulics.

I've got a feeling that's exactly the case.
If so, that loader will never see the psi it needs to lift what it can. The gals/min flow is there, but the lack in psi might cause a pressure relief valve to open when the fel starts to go up. It's weight alone might be enough to cause that to happen once it gets to a certain height?

 

[HangarDebris]

Perhaps your dealer's service department can tell you the test pressures for the charge pump circuit. If they tell you it is in the 300-400 psi range, then it is likely that the charge pump is being used for the auxiliary hydraulics.

I've got a feeling that's exactly the case.
If so, that loader will never see the psi it needs to lift what it can. The gals/min flow is there, but the lack in psi might cause a pressure relief valve to open when the fel starts to go up. It's weight alone might be enough to cause that to happen once it gets to a certain height?

Yes Farmerford and Rob. I think this is the case. I think for the time being I will live with it. I get by for now. If the time comes I get a place I can work it harder I will buld a seperate engine driven pump circuit for it. For now I will selttle for smaller loads in the bucket.

Thanks for the information,
Jim

 

[SkunkWerX]

I wonder if you could drive a small log splitter-style pump off of your PTO?

Lifting 800 lbs with a 900 lb tractor may not be a recommended procedure anyway Be Safe!

Another suggestion: Check with your dealer to see if your output psi is adjusted near it's max. For example, It may be your are only pushing 300 psi, when it could be raised up to 400 psi, still within Specs, but at the higher end of your Specs. That should buy you a few extra pounds of lifting capacity.

And, of course, run it at high (within specs) RPMs.

Good Luck.

Have you taken known weights, like bags of sand and checked your lift capacity? I would be curious as to the amount you can currently lift.

 

[randyny]

I have a simplicity spec doc I can email you - it's about 4.5 MB. It shows the psi as follows:

Hydraulic System:
Pump type Variable Displacement Axial Type
Output @ fast idle .488 in 3/rev. (8 cc/rev)
System Pressure
Implement Relief 1,000 psi
Charge Relief 300-397 psi (2.1 – 2.7 MPa) charge relief
Hydraulic flow (@ 3600 rpm) 6.2 GPM (23.5 l/min) – No Load
5.3 GPM (20.0 l/min) @ 300 psi (2 MPa)