Note

• Safety requirements pertaining to the whole systems are to be observed.

• Please contact us for applications with frequent load changes.

Note

You can find diagrams for a rough calculation in chapter "Diagrams / Characteristic curves".

Hydraulic fluids

The external gear unit is designed for operation with mineral oil according to DIN 51524, 1-3. Under higher load, however, Bosch Rexroth recommends at least HLP compliant with DIN 51524 Part 2.

Application instructions and requirements for hydraulic fluids should be taken from the following data sheets before the start of project planning:

• 90220: Hydraulic fluids based on mineral oils and related hydrocarbons

 

Other hydraulic fluids on request.

Explanatory note regarding the selection of hydraulic fluid

The hydraulic fluid should be selected such that the operating viscosity in the operating temperature range is within the optimum range (v_opt see selection diagram).

Observe the instructions for the filtration of the hydraulic fluid (see chapter Project planning information).

 

Direction of rotation

The dimensional drawings in the chapter Dimensions represent pumps for clockwise rotation. The position of the drive shaft or the position of suction and pressure port changes for counter-clockwise rotation.

Drives

1. Elastic coupling

• The coupling must not transfer any radial or axial forces to the pump.

• The maximum radial runout from the shaft to the spigot may not exceed 0.3 mm.

• See the coupling manufacturer’s assembly instructions for acceptable shaft misalignments.

2. Coupling sleeve

• To be used on splined shaft profile according to DIN and SAE.

• Attention: No radial or axial forces are permitted on the pump shaft or coupling sleeve. The coupling sleeve must be free to move axially.

• The distance between the pump drive shaft and drive shaft on the customer side must 2⁺¹ mm.

• Provide installation space for the snap ring.

• Oil-bath or oil-mist lubrication is required.

3. Coupling dog

• For attaching the pump directly to an electric motor or combustion engine, gear, etc.

• The pump shaft has a special coupling dog and driver (3)

• There is no shaft sealing

• Drive-side installation and sealing according to the following recommendations and dimensions

• Drive shaft on the customer side (1)

• Case-hardening steel DIN EN 10084 e.g. 20MnCrS5 case-hardened 0.6 mm deep; HRC 60^±3

• Seal ring running surface ground without rifling R_max ≤ 4 μm

• Radial shaft seals on the customer side (2)

• Provide with rubber cover (see DIN 3760, type AS, or double-lipped ring)

• Provide installation edge with 15° slant or install shaft seal with protection sleeve

 

4. V-belts and straight gear wheels or helical toothed gear drives without outboard bearing

For V-belt or gear wheel drives, please contact us specifying the application and mounting conditions (dimensions a, d_m, d_w and angle α). For helical toothed gear drives, details of the helix angle β are also required.

Maximum transferable drive torques