SCM-090 Sunfab Bent Axis Piston Motor 90.7cc 400bar Fixed

Product Overview

The SCM-090 (complete model examples: SCM-090W-N-I44-K40-S1M-100-36 / SCM-090W-N-I44-K40-S1M-100) is a Sunfab SCM series fixed-displacement bent-axis piston hydraulic motor. Featuring a spherical-piston bent-axis design, it delivers a compact structure with few moving parts, high starting torque and outstanding operational reliability. Optimized for mobile hydraulic systems, it can be used in open- or closed-circuit applications. This unit offers full dimensional and functional interchangeability with genuine Sunfab SCM-090 motors, matching flange, shaft, ports and overall envelope for direct drop-in replacement. Every unit undergoes 100% simulated operating-condition testing to guarantee consistent performance under high pressure, speed and continuous load.

Technical Specifications 

• Model: SCM-090 (typical codes: SCM-090W-N-I44-K40-S1M-100-36, SCM-090W-N-I44-K40-S1M-100 and similar variants)
• Displacement: 90.7 cm³/rev
• Continuous (rated) working pressure: 350 bar
• Intermittent (peak) pressure: 400 bar
• Continuous speed: approx. 4700 rpm (typical ISO configuration; SAE variants approx. 4200–4400 rpm)
• Maximum (intermittent) speed: 5200 rpm
• Minimum continuous speed: 300 rpm
• Control: Fixed displacement (speed controlled by flow), bidirectional rotation (W = Independent)
• Theoretical starting torque: 1.44 Nm/bar
• Weight (typical ISO flange): approx. 28 kg
• Mounting: ISO 3019-2 (common I44 flange) or SAE options
• Shaft options: Common K40 (DIN 6885 parallel key shaft, 40 mm diameter) and others
• Seals: Optional N (Nitrile) and other materials

Data compiled from official Sunfab SCM series technical documentation. Exact values depend on the specific model code.

Key Technical Advantages

1. Bent-axis spherical-piston design: Spherical pistons combined with precision-machined cylinder block result in few moving parts and a compact structure, delivering high starting torque, low pulsation and smooth operation across the entire speed range.
2. Double tapered roller bearing system: Optimized bearing arrangement supports high radial loads, enabling high speeds and extended service life in heavy-duty mobile applications.
3. Full interchangeability: Flange, shaft, ports and overall dimensions match genuine Sunfab SCM-090 units exactly, enabling direct replacement without interface modifications and minimizing downtime.
4. High overall efficiency and reliability: Quality materials, specialized hardening processes and strict quality control ensure low internal leakage and high volumetric efficiency under high pressure; optional speed-sensor configurations available.
5. 100% simulated-condition testing: Every unit is fully tested for pressure, speed, leakage and noise characteristics prior to shipment, ensuring consistent out-of-box performance.

Application Areas

• Mobile machinery travel drives (wheeled or tracked)
• Winch and slewing drives
• Construction equipment (excavators, loaders, rollers, etc.) main or auxiliary drives
• Agricultural, forestry and industrial hydraulic systems requiring high starting torque and reliable high-pressure output

Expert Maintenance Tips

1. Before installation, thoroughly clean the shaft keyway/spline and flange face; use correct seals and bolt torque values to avoid misalignment or sealing-surface damage.
2. The system must include adequate filtration and overpressure protection; recommended oil viscosity 20–43 cSt and maintain ISO 4406 cleanliness levels to prevent accelerated wear.
3. Fully warm up the system and verify case oil level before starting; avoid dry starts or cavitation and observe case-pressure limits.
4. Regularly monitor leakage rate, noise and bearing temperature; when changing fluid and filters, follow recommended grades.
5. Protect shaft and ports against corrosion during storage; avoid prolonged exposure to moisture or corrosive environments.