Hydraulic rotator KRM 80

Product overview
KRM rotation units provide continuous, stepless 360° rotation for precise attachment orientation on excavators. Designed for integration with milling, trenching and cutting attachments, KRM units use worm-gear drives and heavy-duty bearings to deliver high holding torques across a wide range of models (KRM 20–KRM 80). Compact footprint and reduced maintenance requirements help optimize on-site cycle times.

Key benefits

• Compact design with low maintenance requirements
• Continuous, stepless 360° rotation for exact tool positioning
• High holding torques to stabilise heavy attachments
• Durable worm-gear drive
• Heavy-duty bearings for sustained loads
• Potential to reduce working time by up to 50% in many applications
• In-house developed oil distributors to ensure consistent oil and water flow

Main applications

• Trenching and pipeline installation
• Tunnelling and underground works
• Demolition, renovation and refurbishment
• Surface profiling and milling
• Offset trenching adjacent to walls or barriers

Model comparison

• KRM 20 — Diameter (A): 240 mm; Height (B): 330 mm; Length (C): 350 mm; Max holding torque: 6,000 Nm; Max idle oil flow: 40 l/min; Max operating pressure: 160 bar; Drive motors: 1; Recommended excavator weight: 2–6 t; Recommended idle rpm: 9 rpm; Weight: 138 kg; Width (D): 510 mm
• KRM 30 — Diameter (A): 370 mm; Height (B): 371 mm; Length (C): 500 mm; Max holding torque: 9,000 Nm; Max idle oil flow: 40 l/min; Max operating pressure: 160 bar; Drive motors: 1; Recommended excavator weight: 5–12 t; Recommended idle rpm: 7 rpm; Weight: 335 kg; Width (D): 610 mm
• KRM 35 — Diameter (A): 370 mm; Height (B): 371 mm; Length (C): 500 mm; Max holding torque: 18,000 Nm; Max idle oil flow: 40 l/min; Max operating pressure: 160 bar; Drive motors: 2; Recommended excavator weight: 7–15 t; Recommended idle rpm: 5 rpm; Weight: 387 kg; Width (D): 610 mm
• KRM 40 — Diameter (A): 460 mm; Height (B): 405 mm; Length (C): 555 mm; Max holding torque: 45,000 Nm; Max idle oil flow: 40 l/min; Max operating pressure: 160 bar; Drive motors: 2; Recommended excavator weight: 12–18 t; Recommended idle rpm: 3 rpm; Weight: 493 kg; Width (D): 805 mm
• KRM 50 — Diameter (A): 570 mm; Height (B): 430 mm; Length (C): 690 mm; Max holding torque: 95,000 Nm; Max idle oil flow: 40 l/min; Max operating pressure: 160 bar; Drive motors: 2; Recommended excavator weight: 19–27 t; Recommended idle rpm: 1 rpm; Weight: 629 kg; Width (D): 860 mm
• KRM 60 — Diameter (A): 600 mm; Height (B): 610 mm; Length (C): 780 mm; Max holding torque: 200,000 Nm; Max idle oil flow: 40 l/min; Max operating pressure: 160 bar; Drive motors: 2; Recommended excavator weight: 25–40 t; Recommended idle rpm: 1 rpm; Weight: 910 kg; Width (D): 770 mm
• KRM 70 — Diameter (A): 700 mm; Height (B): 620 mm; Length (C): 910 mm; Max holding torque: 270,000 Nm; Max idle oil flow: 40 l/min; Max operating pressure: 160 bar; Drive motors: 2; Recommended excavator weight: 30–50 t; Recommended idle rpm: 1 rpm; Weight: 1,028 kg; Width (D): 870 mm
• KRM 80 — Diameter (A): 900 mm; Height (B): 820 mm; Length (C): 1,170 mm; Max holding torque: 350,000 Nm; Max idle oil flow: 40 l/min; Max operating pressure: 160 bar; Drive motors: 2; Recommended excavator weight: 50–70 t; Recommended idle rpm: 1 rpm; Weight: 2,068 kg; Width (D): 1,000 mm

Design & operational features

• Endless 360° rotation enables precise orientation without repositioning the carrier machine
• Compact installation interface for easy attachment integration
• Compatibility with a wide range of milling, trenching and cutting attachments
• Space-saving layout to minimise interference with machine operation and reduce downtime

Technical specifications

• Rotation: Continuous, stepless 360°
• Drive type: Worm-gear drive
• Bearings: Heavy-duty bearings for high loads
• Hydraulics: Max idle oil flow 40 l/min (standard across listed models)
• Pressure: Max operating pressure 160 bar (standard across listed models)
• Holding torque range: 6,000 Nm (KRM 20) to 350,000 Nm (KRM 80)
• Drive motors: 1 or 2 depending on model
• Recommended excavator weight: 2 t to 70 t depending on model
• Recommended idle rpm: model-dependent (1–9 rpm)
• Typical benefits: reduced working time (up to 50%), improved precision in confined or offset operations, lower maintenance requirements