Why does a hydraulic motor require a case drain?

Why does a hydraulic motor require a case drain?

Often in hydraulic systems, hydraulic motors and pumps run case drain hoses. The reason for this is to drain excess internal oil leakage from the motor. Running a case drain can also assist with cooling, and also lubrication of the motors in some instances.

Do all hydraulic motors have case drains?

While absolutely essential on a piston-type hydraulic motor, an external case drain line is usually optional on gear motor designs–external, internal and gerotor/geroller. These types of motors don’t have a large-volume case or sump like piston motors do.

What causes high case drain pressure?

If the case drain line is undersized on a hydraulic pump (piston) it can cause the pressure in the case to be too high. As the pump’s life depreciates its volumetric efficiency will decrease, which in turn will increase leakage from the case drain line.

What is a case drain test?

The case drain monitor provides maintenance a means of taking notice of relatively abrupt changes in a pump’s operating characteristics. By noting the baseline flow from the pump case to the reservoir under typical operating conditions, you can log changes in pump case drain flow at periodic intervals.

What is the purpose of a case drain line?

What is a Case Drain Line ? On most skidsteer and excavator Hydraulic systems, Hydraulic motors and pumps require a case drain line. Sometimes referred to as a third line, the case drain line will relieve any excess pressure and drain it back to your return line, then into the reservoir.

What is a case drain on excavator?

The case drain line connects the hydraulic fluid reservoir to the final excavator drive motor. Case drain lines function to carry internal leaking fluid away from the excavator drive motor such as the one on an IHI 28N.

What is a case drain filter?

The case drain filter is typically a silver canister-style filter with a golden-colored element on the inside. Its purpose is to filter out contaminants in the hydraulic fluid. Contaminants include things like metal shavings, flakes, sand, dust, ash, rubber, etc.

What is a case drain coupler?

Hydraulic Flat Face Couplers provide for quick connect/disconnect from your compact equipment to an attachment; fast and dependable fluid connection without leakage and with minimum restriction of fluid flow during operation.

How do you test a hydraulic piston pump?

Testing a Variable Displacement Pump

1. Check the tank line temperature of the relief valve with a temperature gun or infrared camera.
2. Install a flow meter in the case drain line and check the flow rate.
3. Check the current on the drive motor.
4. Ensure the compensator is 200 psi above the maximum load pressure.

Why might a pump be needed in a hydraulic system?

A pump produces liquid movement or flow: it does not generate pressure. It produces the flow necessary for the development of pressure which is a function of resistance to fluid flow in the system. For example, the pressure of the fluid at the pump outlet is zero for a pump not connected to a system (load).

What the difference between a hydraulic pump and motor?

How to differentiate? In principle, hydraulic motors and pumps are reversible. If driven by a motor, the output is pressure energy (pressure and flow), so this is a hydraulic pump; if the pressure oil is input, and the mechanical energy (torque and speed) is output, so, it’s a hydraulic motor.

Can a hydraulic gear pump be used as a motor?

Gear pump is not designed to provide torque its designed to provide flow, however if the torque of the pump and its pressure ratings are equal with the gear motor then it can be used as a hydraulic motor.

What does the hydraulic motor do?

Hydraulic motors convert fluid pressure into rotary motion. Pressurized fluid from the hydraulic pump turns the motor output shaft by pushing on the gears, pistons, or vanes of the hydraulic motor.