BG0140 Parker Brake Motor | Torqmotor LSHT Hydraulic Motor

Product Overview

The Parker Torqmotor™ BG0140 Brake Motor is a fixed-displacement LSHT hydraulic motor designed for low-speed, high-torque hydraulic drive applications where reliable parking or holding capability is required.

The BG Series combines a hydraulic motor with an integrated wet-disc, spring-applied, hydraulically released brake. Hydraulic pressure at the brake release circuit disengages the brake for motor operation, while removal of release pressure allows the spring mechanism to reapply the brake for parking or load holding. Parker documentation specifically identifies the brake as a parking/holding brake rather than a dynamic braking device.

The BG Series covers displacement sizes from 141 cm³/rev to 959 cm³/rev, with BG0140 representing the 141 cm³/rev / 8.6 in³/rev displacement configuration.

The requested configurations are:

• BG0140AS050AAAB
• BG0140AS080AAAB

Parker’s ordering information shows that the complete model code defines mounting, shaft, rotation and other configuration characteristics. Therefore, the complete code should always be verified when selecting a replacement motor.

For replacement applications, our engineering approach emphasizes dimensional interchangeability, configuration matching and 100% simulated operating-condition testing before shipment.

Technical Specifications

Motor Configuration

• Brand: Parker Hannifin
• Product Family: Torqmotor™ BG Series
• Product Type: LSHT Hydraulic Brake Motor
• Motor Type: Fixed Displacement
• Model: BG0140
• Complete Model Options: BG0140AS050AAAB / BG0140AS080AAAB
• Displacement: 141 cm³/rev
• Displacement: 8.6 in³/rev

Brake System

• Brake Type: Wet Disc Brake
• Brake Design: Spring Applied, Hydraulically Released
• Standard Holding Capacity: 12,000 lb-in
• Standard Holding Torque: 1,350 Nm
• Maximum Full Release Pressure: 22 bar / 315 psi
• Brake Release Port Capability: Up to 3,000 psi

BG Series Performance Limits

• Maximum Continuous Pressure: Up to 207 bar / 3,000 psi
• Maximum Intermittent Pressure: Up to 276 bar / 4,000 psi
• Maximum Oil Flow: Up to 114 L/min / 30 gpm
• Maximum Speed: Up to 660 rpm
• Maximum Torque: Up to 1,044 Nm continuous
• Maximum Intermittent Torque: Up to 1,428 Nm
• Maximum Side Load at Key: Up to 16,000 N / 3,597 lb

Engineering Note: These pressure, flow, speed and torque values are published BG Series limits and should not be interpreted as simultaneous operating limits for every BG0140 configuration. Actual BG0140 operating performance must be verified against the applicable Parker performance curves and the complete model configuration.

Ordering-Code Configuration

• BG: BG Series Brake Motor
• 0140: 141 cm³/rev displacement
• AS: Front mounting / front bolting configuration
• 05: 1-1/4″ 14-tooth spline shaft
• 08: 1-1/4″ tapered shaft
• AAAB: No-paint configuration

Therefore:

• BG0140AS050AAAB: BG0140 with AS mounting and 05 shaft configuration
• BG0140AS080AAAB: BG0140 with AS mounting and 08 shaft configuration

Key Technical Advantages

1. LSHT Low-Speed High-Torque Performance

The BG0140 uses the LSHT hydraulic motor architecture to deliver high torque at relatively low rotational speed.

This makes it particularly suitable for applications requiring:

• High starting torque
• Controlled low-speed rotation
• Frequent start-stop operation
• High inertia loads
• Low-speed hydraulic drive

The design prioritizes hydraulic torque transmission and controllable low-speed performance rather than high-speed operation.

2. Integrated Wet-Disc Parking Brake

The integrated wet-disc brake is one of the key engineering characteristics of the BG Series.

The brake operates on a:

Spring-Applied / Hydraulically Released

principle.

Hydraulic pressure releases the brake during motor operation. When release pressure is removed, the spring mechanism applies the brake for parking or holding.

This architecture is particularly useful for mobile machinery and industrial equipment where reliable stationary holding is required.

3. High Side-Load Capability

Parker’s BG Series documentation specifies a maximum side load at the key of up to 16,000 N / 3,597 lb.

This capability makes the motor suitable for mechanical systems involving external loads from:

• Sprockets
• Gears
• Pulleys
• Wheel drives
• Chain transmissions

However, radial load, load location, speed and bearing life must still be evaluated during system design.

4. High-Pressure Shaft Sealing

The BG Series incorporates a high-pressure shaft seal configuration designed for hydraulic applications where reliable shaft sealing is critical.

This is particularly valuable in mobile and outdoor machinery exposed to:

• Hydraulic pressure
• Dust
• Water
• Mud
• Temperature variations
• Frequent cycling

5. Multiple Shaft Configurations

Parker provides multiple shaft configurations within the BG platform, including keyed, spline and tapered shaft designs.

For the two requested configurations, shaft identification is especially important:

• BG0140AS050AAAB → Code 05 shaft
• BG0140AS080AAAB → Code 08 shaft

These configurations should not be treated as mechanically interchangeable without confirming the driven machine’s shaft interface.

Application Areas

Typical applications for the Parker BG0140 Brake Motor include:

• Construction machinery
• Hydraulic winches
• Hoisting equipment
• Material handling systems
• Conveyor drives
• Agricultural machinery
• Forestry equipment
• Road construction machinery
• Industrial rotary drives
• Hydraulic wheel-drive systems
• Marine deck machinery
• Mobile hydraulic equipment

The BG architecture is particularly appropriate for machinery requiring both hydraulic rotary drive and reliable parking or holding capability.

Expert Maintenance Tips

1. Verify the Complete Model Number

Always verify the complete ordering code rather than specifying only BG0140.

The following configurations have different shaft interfaces:

• BG0140AS050AAAB
• BG0140AS080AAAB

Parker’s ordering system uses the complete configuration code to identify mounting, shaft, rotation and other options.

2. Do Not Use the Integrated Brake for Dynamic Braking

The BG brake is designed primarily for parking and holding.

Parker specifically states that dynamic braking is not recommended.

For high-inertia rotating systems, speed reduction should therefore be managed through the hydraulic circuit or an appropriate dedicated braking system.

3. Check Installation Orientation

Parker documentation specifies installation restrictions for certain mounting configurations. Operation with the shaft positioned upward more than 30° from horizontal is not recommended for the specified configurations; non-horizontal applications should be tested and approved before production use.

4. Inspect the Brake Release Circuit

After installation, verify:

• Brake release pressure
• Complete brake disengagement
• Absence of brake drag
• Correct brake reapplication
• Hydraulic circuit response
• Release-port cleanliness

Insufficient release pressure can cause brake drag, heat generation and accelerated wear.

5. Service Springs and Seals

Parker’s technical information recommends servicing the brake springs and seals at or before 500,000 brake cycles.

Actual service intervals should be adjusted according to duty cycle, load, operating temperature, hydraulic-fluid cleanliness and machine safety requirements.

6. Perform 100% Simulated Operating-Condition Testing

For replacement BG0140 units, a professional manufacturing QA process should include:

• Pressure testing
• Flow testing
• Speed verification
• Rotation-direction verification
• Torque verification
• Brake-release testing
• Static holding testing
• Leakage inspection
• Noise and vibration inspection
• Temperature-rise inspection
• Full configuration verification

This testing approach helps confirm not only dimensional interchangeability but also functional equivalence under the customer’s actual hydraulic operating conditions.

Engineering reference: Parker’s BG Series documentation confirms the 13 displacement configurations, ordering-code structure, brake architecture and series-level performance limits used above.