Hawe pumps up its axial-piston pumps

  • 05-Apr-2011 03:34 EDT
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With a new housing construction, Hawe says its V30E variable displacement axial-piston pump is ready for more demanding challenges in mobile hydraulics.

Hawe Hydraulik has redesigned the housing of its V30E-270 variable displacement axial-piston pump, extending its range to include particularly demanding applications such as concrete pumps, harbor cranes, and large hydraulic excavators.

A new SAE E mounting flange conforms to SAE J744. This version now comes as a third mounting flange variant on top of the existing versions that conform to DIN ISO 3019-2/SAE J744 D and SAE J744 E. The shaft versions were also extended by another spline shaft variant according to SAE J744, allowing a wide variety of combination options for the driveshaft and mounting flange.

If the pump is used in tandem, i.e., two V30E-270 pumps, the load increases. The end housing was therefore designed to ensure safe transmission of higher drive performances from the first to the second pump. Like all other pumps from the V30E series, the V30E-270 type can also be combined in tandem with Hawe's radial piston pumps.

The V30E is generally suited for open circuits both in mobile and industrial hydraulics. The purpose-built followers, swashplate bearing, and control plate add to the pump's robustness. The extensive controller program supports its varied potential applications. Hawe says that this pump model also features particularly low noise levels.

The V30E-270 has been designed for an operating pressure of up to 5075 psi (350 bar), with a peak pressure of 6000 psi (420 bar). The output volume is up to a maximum of 124 gal/min (470 L/min) at 1750 rpm, with a geometric displacement of 270 cm³/rev.

Combined with Hawe's proportional directional spool valves and electronic controls, the pump lends itself to being part of a customized hydraulic system. The new nominal size 7 of the proportional directional spool valve is suited for the tandem combination of two V30E-270 pumps.

Hawe has also added a newly designed load-sensing controller to its V60N variable displacement axial-piston pump for what it describes as more reliable operation.

V60N is particularly suited for open-loop circuits in mobile hydraulics, such as for ancillary drives. The new controller contains an integrated pressure limitation function so even unusual requirements can be met with little effort, says the company. Regardless of the pump being connected to either soft, vibration-prone, or rigid and swiftly reacting systems, the controller is easy to adjust due to a special set screw that serves as the sole adjusting element for the dampening and on-stroke velocity of the pump.

The adjusting screws for the pressure relief and the stand-by pressure are positioned on the controller in direction of the shaft. Even if the pump is already pre-installed, for example at the transmission of a truck, the user can still easily adjust the settings via the screws. The single-piece screen at the load-sensing input can be cleaned and exchanged without the need for special tools.

The special surface finish ensures the controller's longevity, and it comes in a more compact build compared with its predecessor model.

Type V60N is also a swashplate design, with the same operating and peak pressures as the V30E-270. Its geometric displacement is up to 110 cm³/rev, with a maximum flow rate of 105 gal/min (397 L/min).

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