Hydraulic system issue...
Hydraulic system issue...
(OP)
Hi Gents,
We have an ongoing simple winch project and got stuck a bit with hydraulic motor issue.
The system consists of a hydraulic unit (tank+gear pump+el motor), supplying pressure/flow to an axial piston motor.
The winch is equipped with centrifugal brakes (same principle as drum brakes in automotive industry). We use those brakes to lower loads without el. power. This means that the pump in hydraulic unit is not running and the axial piston motor (working in reverse during lowering) is not supplied with pressurized oil.
Any idea how to safely loop the motor to avoid cavitation and keep it lubricated?
We have an ongoing simple winch project and got stuck a bit with hydraulic motor issue.
The system consists of a hydraulic unit (tank+gear pump+el motor), supplying pressure/flow to an axial piston motor.
The winch is equipped with centrifugal brakes (same principle as drum brakes in automotive industry). We use those brakes to lower loads without el. power. This means that the pump in hydraulic unit is not running and the axial piston motor (working in reverse during lowering) is not supplied with pressurized oil.
Any idea how to safely loop the motor to avoid cavitation and keep it lubricated?





RE: Hydraulic system issue...
Give more details and you will have an answer for your situation.
Regards
RE: Hydraulic system issue...
Mike Halloran
Pembroke Pines, FL, USA
RE: Hydraulic system issue...
Peter Nachtwey
Delta Computer Systems
http://www.deltamotion.com
RE: Hydraulic system issue...
Mike Halloran
Pembroke Pines, FL, USA
RE: Hydraulic system issue...
Ted
RE: Hydraulic system issue...
Providing positive head of pressure to the motor by a line from the tank is not possible in our case as the tank is places approx. 1 meter below the winch. We were considering this before - tank has to be lower due to manufacturing & operation reasons.
hydtools,
The installation height is around 50 meters. We were planning to loop the motor as you said from A to B ports. In this case, keeping in mind the installation height, we might need to refill the circuit with fresh oil as some of it will go to internal leakage.
In this circuit (without oil refill) will the motor have tendency to cavitate?
RE: Hydraulic system issue...
Do you have a motor spool in the motor directional valve? This would open motor ports to each other and tank so the motor would turn freely with the directional valve centered.
Ted
RE: Hydraulic system issue...
There is a pilot operated directional valve which loops both motor lines while the suction line remains open to tank.
We were sure in the beginning that this solution would work however the motor manufacturer (his representative) was concerned about cavitation in this loop and advised to provide pressurized oil to it or place the tank above motor position.
Attached the loop...
RE: Hydraulic system issue...
Can you show us all of the circuit schematic?
Ted