Rotary Motor

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

3 year

Product details

1. Product Name & Model Numbers

Chinese: 三一75 / 现代80 / 徐工80 回转马达

English:

• Sany SY75C / Hyundai R80-7 / XCMG XE80U Rotary Motor Assembly

(Note: Specific excavator models are appended, e.g., SY75C for Sany’s 7.5-ton class)

Sub-Models:

• Sany 75 Series: SY75C, SY75N, SY75W (Wheeled)

• Hyundai 80 Series: R80-7, R80CR-9, R80LC-7

• XCMG 80 Series: XE80U, XE80C, XE80DA

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2. Key Specifications (Example)

【表格】

Parameter Sany SY75C Hyundai R80-7 XCMG XE80U

Displacement (cc/rev) 85 92 88

Rated Pressure (MPa) 25 28 26

Max Speed (rpm) 120 115 118

Output Torque (Nm) 2,200 2,500 2,350

Compatible Machine Weight (t) 7.5–8.5 8.0–9.0 7.8–8.8

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3. Structural & Functional Features

Chinese Description:

• Design: Swashplate axial piston motor with integrated brake valve and relief valve.

• Sealing System: Fluororubber (FKM) seals for high-temperature resistance (-30°C to +120°C).

• Hydraulic Compatibility: Flow range 40–60 L/min, pressure fluctuation compensation ≤5%.

Technical Details:

• Brake System: Spring-applied, hydraulically released brake with a torque rating of 1,800 Nm.

• Cooling Method: Forced lubrication with case-drain oil return.

• Noise Level: ≤75 dB(A) at rated speed (ISO 3744 compliant).

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4. Compatibility Notes

Chinese:

• Direct replacement forNabtesco M8X90andEaton 6K-110series motors.

• Mounting interface conforms toISO 6162-1, with bolt pattern 105mm×105mm.

English Translation:

• Interchangeability: Fully compatible with Nabtesco M8X90 and Eaton 6K-110 motors (drop-in replacement).

• Mechanical Interface:

• Port threads:BSPP 3/4"(inlet/outlet),M16×1.5(case drain).

• Shaft keyway:12mm×8mm×30mm(DIN 6885 standard).

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5. Troubleshooting & Maintenance

Common Issues:

1. Slew Jerking: Brake valve spring fatigue (replace with P/N:HY-BRK-007).

2. Oil Leakage: O-ring degradation (useParker Trueline70 Shore hardness seals).

3. Excessive Noise: Piston shoe wear (return for repair if clearance >0.05mm).

Maintenance Schedule:

• 500-hour service: Replace hydraulic filter (filter rating ≤10μm).

• 2,000-hour service: Inspect bearing clearance; replace rotary group if out of tolerance.

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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3 year

Main Product: hydraulic motor , gear box, hydraulic pump, hydraulic valve , hydraulic winch, hydraulic system

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