Danfoss H1 Series, Основная информация

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Independent braking system
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.
Fluid selection
Ratings and performance data are based on operating with hydraulic fluids containing oxidation, rust
and foam inhibitors. These fluids must possess good thermal and hydrolytic stability to prevent wear,
erosion, and corrosion of pump components.
C
CAUTION
Never mix hydraulic fluids of different types.
Reservoir
The hydrostatic system reservoir should accommodate maximum volume changes during all system
operating modes and promote de-aeration of the fluid as it passes through the tank. A suggested
minimum total reservoir volume is 5⁄8 of the maximum charge pump flow per minute with a minimum
fluid volume equal to ½ of the maximum charge pump flow per minute. This allows 30 seconds fluid
dwell for removing entrained air at the maximum return flow. This is usually adequate to allow for a
closed reservoir (no breather) in most applications.
Locate the reservoir outlet (charge pump inlet) above the bottom of the reservoir to take advantage of
gravity separation and prevent large foreign particles from entering the charge inlet line. A 100-125 µm
screen over the outlet port is recommended. Position the reservoir inlet (fluid return) to discharge below
the normal fluid level, toward the interior of the tank. A baffle (or baffles) will further promote de-aeration
and reduce surging of the fluid.
Case drain
All single H1 pumps are equipped with multiple drain ports whereas some H1 pumps are equipped with
two case drain port sizes. Port selection and case drain routing must enable the pump housing to
maintain a volume of oil not less than half full and normal operating case pressure limits of the unit are
maintained. Case drain routing and design must consider unit case pressure ratings.
A case drain line must be connected to one of the case outlets to return internal leakage to the system
reservoir.
Basic Information
H1 Axial Piston Pumps, Single and Tandem
System design parameters
30 | © Danfoss | April 2017 11062168 | BC00000057en-US0602