Temperature; Case Pressure; Independent Braking System; Reservoir - Danfoss LPV Technical Information

Technical Information
LPV Axial Piston Pumps
Operating parameters

Temperature

Case pressure

Independent braking system

Reservoir

© Danfoss | September 2017
severe duty cycle operation. Maximum viscosity should only occur at cold start. Limit speeds until the
system warms up. Refer to Specifications
Maintain fluid temperature within the limits shown in the table.
Minimum temperature relates to the physical properties of the component materials. Cold oil will not
affect the durability of the pump components, however, it may affect the ability of the pump to provide
flow and transmit power. Maximum temperature is based on material properties. Don't exceed it.
Measure maximum temperature at the hottest point in the system. This is usually the case drain. Refer to
Specifications on page 20, for specifications.
Ensure fluid temperature and viscosity limits are concurrently satisfied.
Do not allow case pressure to exceed ratings under normal operating conditions. During cold start, keep
case pressure below maximum intermittent case pressure. Size drain plumbing accordingly.
C
Caution
Possible component damage or leakage.
Operation with case pressure in excess of stated limits may damage seals, gaskets, and/or housings,
causing external leakage. Performance may also be affected since charge and system pressure are
additive to case pressure.
W
Warning
Unintended vehicle or machine movement hazard.
The loss of hydrostatic drive line power, in any mode of operation (forward, neutral, or reverse) may cause
the system to lose hydrostatic braking capacity. You must provide a braking system, redundant to the
hydrostatic transmission, sufficient to stop and hold the vehicle or machine in the event of hydrostatic
drive power loss.
The reservoir provides clean fluid, dissipates heat, and removes trapped air from the hydraulic fluid. It
allows for fluid volume changes associated with fluid expansion and cylinder differential volumes.
Minimum reservoir capacity depends on the volume needed to perform these functions. Typically, a
capacity of 5/8 of the charge pump flow (per minute) is satisfactory for a closed reservoir. Open circuit
systems sharing a common reservoir require greater fluid capacity.
Locate the reservoir outlet (suction line) near the bottom, allowing clearance for settling foreign particles.
Use a 100 - 125 µm screen covering the outlet port.
Place the reservoir inlet (return lines) below the lowest expected fluid level, as far away from the outlet as
possible. Use a baffle (or baffles) between the reservoir inlet and outlet ports to promote de-aeration and
reduce fluid surging.
on page 20, for specifications.
Technical specifications
520L0954 | BC00000044en-US0102 | 9
on page 20.