HDL 1000-2500 / 1600-4000
Air-Hydraulic Pumps ready for immediate use at hydraulic
pressures of 2500 to 4000 bar.



The SCHAAF HDL Series is a high-capacity, compact air-hydraulic high-pressure unit, specially designed for industrial use.

  • Low air pressure for extreme working pressures
  • 1 bar air pressure = 425 bar hydraulic pressure
  • 1 bar air pressure = 740 bar hydraulic pressure
  • Rugged, compact and durable design
  • Small dimensions
  • Low weight
  • Immediately ready for use, fully assembled and oil filled
  • All components sealed leakproof
  • No pressure loss even at 4000 bar
  • Manufactured in high-quality materials
  • Hardened, replaceable valve seats
  • Pressure relief valve with internal tank return line
  • Installed in rugged housing
  • Low-maintenance operation
  • Distributor block for up to four connections


Areas of Application

The SCHAAF HDL Series is ideally suited for:

  • The use of bolt tensioners, hydraulic nuts,
    ExpaTen Bolts and EcoRolls
  • Tightening and loosening of oil press fits (e.g., gearwheels, flywheels, coupling hubs, roller bearings, hydraulic couplings and overload protection devices)


Quality Assurance

All HDL 1000-4000 are checked for material quality, dimensional accuracy, correct functioning and load-resistance. During order execution, they are subject to continuous quality assurance measures and are supplied together with detailed technical documentation.



HDL 1000-4000 are, of course, oil filled and ready for immediate use.

SCHAAF HDL 1000-4000 are user-friendly, reliable, and manufactured in accordance with the highest level of technical know-how. Our highly-motivated staff would be pleased to train your personnel, in situ or at our works, in the general handling and operation of high-pressure equipment.