500120 505200 530470 530750 Parker Torqmotor Hydraulic Motor BMER

Product Overview

The 500120, 505200, 530470, and 530750 Series are Parker Torqmotor™ low-speed, high-torque (LSHT) orbital hydraulic motors, covering the 500 Series, 501 Series, 505 Series, and 530 Series product lines. These motors feature proven geroler technology with shaft distribution flow, delivering high starting torque, smooth operation, and excellent volumetric efficiency.

This series offers broad compatibility with Parker TG Series and Danfoss White 500/530 Series motor mounting interfaces, making them ideal propulsion and rotary drive solutions for skid steer loaders, mowers, aerial work platforms, and agricultural equipment.

As a premium aftermarket alternative to original Parker Torqmotor series orbital motors, this product is manufactured to strict Parker OEM specifications, ensuring 100% interchangeability with original equipment—direct bolt-on replacement with zero modification required. Every motor undergoes 100% simulated load testing prior to shipment to verify performance and reliability under rated operating conditions.

Technical Specifications

500120 Series (BMER-2-125-MS-G2-R-B)

• Product Series: Parker 500/501 Series Torqmotor™ Orbital Hydraulic Motor

• Geometric Displacement: 121 cm³/rev (7.4 in³/rev)

• Maximum Speed (Continuous/Intermittent): 360 rpm / 490 rpm

• Maximum Flow (Continuous/Intermittent): 45 L/min (12 GPM) / 61 L/min (16 GPM)

• Continuous Torque: 327 Nm (2,900 lb-in)

• Intermittent Torque: 383 Nm (3,400 lb-in)

• Continuous Pressure: 207 bar (3,000 psi)

• Intermittent Pressure: 241 bar (3,500 psi)

• Peak Pressure: 276 bar (4,000 psi)

• Mounting: 4-bolt Magneto flange

• Shaft Type: 1-1/4″ straight keyed shaft

• Port Size: #10 SAE (7/8″-14 UNF)

• Design Type: Geroler

• Control Type: Bi-directional rotation, hydraulic control

• Equivalent Model: Parker TG0125ES030AAAA

505200 Series (RE Series)

• Product Series: Parker/White RE Series Orbital Hydraulic Motor

• Geometric Displacement: 200 cm³/rev

• Displacement Range (Full Series): 121 – 748 cm³

• Design Type: Geroler, roller stator

• Control Type: Bi-directional rotation, hydraulic control

• Mounting: 4-bolt SAE A flange / Wheel mount

• Port Size: G1/2″

• Shaft Options: Multiple configurations (straight key, splined, tapered)

• Operating Pressure: 207 bar / 276 bar

• Equivalent Model: RE200 / 11200011

530470 Series (BMER-3-475-WD-T31-R-B)

• Product Series: White 530 Series RC 470 Orbital Hydraulic Motor

• Geometric Displacement: 475 cm³/rev

• Design Type: Geroler, wheel-mount design

• Control Type: Bi-directional rotation, hydraulic control

• Mounting: Wheel mount

• Typical Application: Multione SL40DT loader

• Equivalent Model: BMER-3-475-WD-T31-R-B, 11200226

530750 Series (BMER-2-750)

• Product Series: Parker TG 530/750 Series Orbital Hydraulic Motor

• Geometric Displacement: 750 cm³/rev

• Design Type: Geroler

• Control Type: Bi-directional rotation, hydraulic control

• Equivalent Model: BMER-2-750MDG2B

• Technical Features: Low internal leakage, high volumetric efficiency, low friction, long service life

Key Technical Advantages

1. Advanced Geroler Gear Set Design
The 500/530 Series utilizes geroler gear set technology with rollers running within the rotor set, significantly reducing friction losses. Compared to traditional gerotor designs, geroler technology delivers higher pressure capacity, lower internal leakage, and extended service life.

2. 100% Interchangeable Design
All models are manufactured to strict Parker TG Series and Danfoss White 500/530 Series mounting interface standards. The 500120 Series directly replaces Parker TG0125ES030AAAA; the 530470 Series directly replaces BMER-3-475-WD-T31-R-B. No modifications or adapters are required, significantly reducing equipment downtime and retrofit costs.

3. High-Strength Cast Iron Housing & Precision Machining
High-strength cast iron housings provide excellent shock and vibration resistance. Geroler gear sets are precision-ground with tightly controlled clearances, ensuring high volumetric efficiency even under high-pressure conditions. All critical friction surfaces undergo surface hardening treatment for extended service life.

4. High-Reliability Sealing System & Patented High-Pressure Shaft Seal
Patented Parker high-pressure shaft seal design prevents oil leakage along the shaft. The optimized sealing structure maintains excellent sealing performance under high-pressure, high-speed operating conditions, reducing maintenance frequency and operating costs.

5. Needle Bearings & Superior Load Capacity
The entire series is equipped with needle bearings, significantly enhancing radial load capacity and shock resistance. The pressure-compensated distribution system maintains low internal leakage even under high operating pressures, ensuring stable volumetric efficiency.

Application Areas

• Skid Steer Loaders: Propulsion drive motors

• Compact Track Loaders (CTL) : Traction drive systems

• Mowers & Turf Equipment: Zero-turn mower drive wheels

• Aerial Work Platforms: Lift and rotation drives

• Agricultural Machinery: Self-propelled sprayers, fertilizer spreaders, forage harvesters

• Material Handling Equipment: Forklifts, AGV drive wheels

• Snow Removal Equipment: Snow blower traction drives

• Peat & Wood Chip Transport Trucks: Typical RE Series application

Expert Maintenance Tips

Installation Guidelines:

1. Model Verification: Before installation, verify the motor model and physical dimensions on the original equipment. This series includes multiple models and sub-models (500120A3120AAAA, 505200W3822AAAAAS, 530470T3831AAAAA, 530750A5130ZAAAA, etc.)—different models may vary in displacement, torque output, and mounting interfaces. Ensure correct model selection, particularly shaft type (straight key, splined, tapered) and mounting flange configuration.

2. Fluid Cleanliness: Maintain system fluid cleanliness to ISO 4406 18/16/13 minimum. Inlet fluid must pass through 10μm absolute filtration. Geroler motors are sensitive to fluid contamination—insufficient cleanliness will directly impact gear set life and volumetric efficiency.

3. Case Pressure & Drain Port Management: Verify whether the motor is equipped with a drain port. If a drain line is required, ensure the line is unobstructed and back pressure does not exceed recommended limits.

4. Shaft Alignment: Precise alignment between motor output shaft and driven load is critical. Misalignment significantly reduces bearing life and increases side loading.

5. Mounting Bolt Torque: Mounting bolts must be torqued to Parker-specified values and re-torqued after initial operation.

Routine Maintenance:

1. Leak Inspection: Regularly inspect housing and shaft seal areas for oil seepage. Replace seals immediately if leakage is detected.

2. Fluid Change Interval: Initial fluid change at 100 hours, thereafter every 1000 operating hours or annually, whichever comes first.

3. Operating Duty Monitoring: Operate motors within continuous duty ratings. Intermittent duty (e.g., 6 seconds per minute) and peak duty (e.g., 0.6 seconds per minute) are permitted for short durations only.

4. Vibration & Noise Monitoring: If abnormal vibration or increased noise is detected during operation, shut down immediately for inspection to identify potential geroler gear set wear or bearing damage.