BG0405CS190AAAB Parker Torqmotor Brake Motor

Product Overview

The Parker Torqmotor™ BG0405CS190AAAB is a fixed-displacement, low-speed high-torque hydraulic motor integrated with a wet-disc brake. It is designed for hydraulic drive applications that require substantial low-speed torque together with a dedicated parking or holding function.

Parker describes the BG Brake Motor as a BG Series motor integrated into a wet-disc, spring-applied, hydraulically released brake. The standard brake holding capacity is 1,350 Nm (12,000 lb-in), and the brake release port is capable of pressures up to 3000 psi.

The two configurations supplied in your original title are:

• BG0405CS190AAAB
• BG0405CS190AABP

Both use the same core BG0405 + CS + 19 + 0 configuration. The difference is the final option code:

• AAAB: Standard, No Paint
• AABP: Castle Nut, No Paint

Parker specifies AABP as a castle-nut option for tapered-shaft motors, replacing the standard patch-locking nut arrangement.

For replacement applications, the complete model code should be matched, including displacement, mounting, ports, shaft, rotation and nut/finish options.

Technical Specifications

BG0405CS190AAAB / BG0405CS190AABP

• Brand: Parker Hannifin
• Series: Torqmotor™ BG Series Brake Motor
• Type: Fixed Displacement LSHT Hydraulic Motor with Brake
• Model: BG0405CS190AAAB
• Alternative Configuration: BG0405CS190AABP
• Displacement Code: 0405
• Geometric Displacement: 405 cm³/rev
• Displacement: 24.7 in³/rev
• Mounting/Port Code: CS
• Mounting: Rear Mounting / Thru Bolting
• Main Ports: 7/8-14 SAE O-Ring
• Shaft Code: 19
• Shaft: 1-3/8″ J501 Tapered Shaft
• Rotation Code: 0
• Rotation: Standard Rotation
• Displacement Control: Fixed Displacement
• Brake Type: Wet-Disc Brake
• Brake Actuation: Spring Applied / Hydraulically Released
• Standard Brake Holding Capacity: 1350 Nm / 12,000 lb-in
• Brake Release Port Maximum: 3000 psi
• BG Series Maximum Continuous Pressure: 207 bar / 3000 psi
• BG Series Maximum Intermittent Pressure: 276 bar / 4000 psi
• BG Series Maximum Oil Flow: 114 L/min / 30 gpm
• BG Series Maximum Speed: 660 rpm
• BG Series Maximum Continuous Torque: 1044 Nm
• BG Series Maximum Intermittent Torque: 1428 Nm
• BG Series Maximum Side Load: 16,000 N
• CS Configuration Weight for BG0405: 29.5 kg / 65.2 lb
• CS Configuration Length for BG0405: 221.7 mm / 8.73 in
• AAAB: Standard, No Paint
• AABP: Castle Nut, No Paint

Engineering note: The pressure, flow, speed and torque figures above that are explicitly identified as BG Series maximums represent catalogue limits for the series. They should not be interpreted as simultaneous allowable operating values for every BG0405 configuration. Final selection should be verified against the applicable performance curves and the machine duty cycle.

Key Technical Advantages

1. 405 cm³/rev High-Displacement LSHT Design

The BG0405 provides 405 cm³/rev geometric displacement. This relatively large displacement supports high torque generation at comparatively low shaft speeds, making the motor suitable for heavy-duty rotational mechanisms.

2. Integrated Wet-Disc Parking Brake

The brake uses a spring-applied, hydraulically released operating principle. Hydraulic release pressure disengages the brake during operation, while removal of release pressure allows the spring mechanism to reapply the brake. This architecture is suitable for hydraulic machinery requiring controlled parking or holding.

3. Rear-Mount CS Configuration

The CS mounting code specifies rear mounting / thru bolting with 7/8-14 SAE O-Ring ports. This configuration can be advantageous where the existing machine layout requires rear mounting and SAE hydraulic connections.

4. 1-3/8″ J501 Tapered Shaft

The 19 shaft code specifies a 1-3/8″ J501 tapered shaft. Tapered shaft geometry provides a dedicated mechanical interface for appropriate hubs and drive components. Correct installation and tightening procedures are essential for maintaining the intended shaft connection.

5. Engineered for Radial Shaft Loads

Parker provides specific dynamic side-load guidance for BG motors and bases bearing-life calculations on ISO 281 L10 methodology. This makes radial-load analysis important when the motor directly drives sprockets, pulleys or external gears.

6. Configurable Nut and Finish Options

The difference between AAAB and AABP is not displacement. AAAB specifies the standard no-paint configuration, while AABP specifies a castle nut, no paint option for the tapered shaft. This distinction is important when replacing a motor in an existing mechanical assembly.

Application Areas

Typical applications for the Parker BG0405CS190AAAB / BG0405CS190AABP include:

• Construction machinery
• Heavy-duty hydraulic drives
• Hydraulic wheel-drive systems
• Winches and hoisting equipment
• Conveyor drives
• Agricultural machinery
• Forestry equipment
• Road construction equipment
• Material handling systems
• Heavy-duty rotary machinery
• Hydraulic machinery requiring parking-hold capability

Final application approval should consider pressure, flow, speed, torque, duty cycle, brake requirements and shaft radial loading.

Expert Maintenance Tips

Verify the Complete Ordering Code

Before installation, verify the complete configuration:

BG0405 + CS + 19 + 0 + AAAB/AABP

The complete code controls mounting, port, shaft, rotation and option configuration.

Install the J501 Tapered Shaft Correctly

The model uses a 1-3/8″ J501 tapered shaft, not a standard keyed shaft. The shaft and hub must be correctly matched and installed according to the applicable Parker installation requirements. For AABP configurations, the specified castle-nut arrangement should be retained.

Verify Brake Release

Because the brake is hydraulically released, verify that the release circuit reaches the required pressure and that the brake fully disengages before sustained motor operation.

Calculate Radial Loading

When the motor drives a sprocket, pulley or external gear, evaluate radial force together with load position and shaft speed. Torque capacity alone does not guarantee acceptable bearing life. Parker’s methodology references ISO 281 L10 bearing life.

Maintain Hydraulic Cleanliness

Flush hydraulic lines before installation and prevent metal particles, welding debris and seal fragments from entering the motor ports. Clean hydraulic fluid is essential for reliable LSHT motor operation.

Perform 100% Simulated Operating-Condition Testing

For replacement units, a professional QA process should include 100% simulated operating-condition testing covering hydraulic pressure, flow, rotational speed, brake release, shaft operation, sealing, temperature rise, abnormal noise and mechanical configuration.