TG0405 Parker Gerotor Hydraulic Motor 405 cc/rev

Product Overview

The Parker TG0405 is a fixed-displacement Gerotor LSHT hydraulic motor with a geometric displacement of 405 cm³/rev (24.7 in³/rev). Parker’s official TG documentation specifies the series for high volumetric efficiency, long operating life, high starting torque, high side-load capability, full-flow spline cooling, high-pressure shaft sealing and shaft-seal cooling.

With a large 405 cm³/rev displacement, TG0405 is designed for applications where the hydraulic system requires low rotational speed and high output torque rather than high-speed operation.

The TG0405 platform is suitable for interchangeable replacement programs, OEM service, MRO and hydraulic system refurbishment. For replacement projects, the complete original part number must be matched because TG configuration codes define mounting, shaft and port variations.

Our replacement manufacturing process focuses on dimensional interchangeability and 100% simulated working-condition testing, providing additional validation before shipment.

Technical Specifications

• Series: Parker TG Series
• Motor Type: Fixed-Displacement Gerotor / LSHT Hydraulic Motor
• Displacement: 405 cm³/rev
• Displacement: 24.7 in³/rev
• Maximum Continuous Differential Pressure: 172 bar / 2,500 psi
• Maximum Intermittent Differential Pressure: 241 bar / 3,500 psi
• Maximum Supply Pressure: 300 bar / 4,350 psi
• Maximum Operating Speed: 232 rpm
• Maximum Continuous Flow: 76 L/min / 20 GPM
• Maximum Intermittent Flow: 95 L/min / 25 GPM
• Maximum Continuous Output Torque: 942 Nm / 8,336 lb-in
• Maximum Intermittent Output Torque: 1,342 Nm / 11,877 lb-in
• Maximum Continuous Power: 27 kW
• Maximum Intermittent Power: 37 kW
• Control: Fixed displacement; motor speed is primarily controlled by hydraulic flow, while output torque is determined by differential pressure and motor efficiency
• Reference Weight: 16.9 kg for Parker TG0405 H/V configurations; exact weight varies with configuration.

Specific TG0405 Ordering Codes

TG0405US081AAMF

• Parker TG Series hydraulic motor
• 405 cm³/rev displacement
• Exact mounting, shaft and option configuration should be verified against the original identification code before replacement.

TG0405MS030AAAA

• Parker TG Series
• 405 cm³/rev displacement
• Magneto mounting
• 1-1/4 in keyed shaft
• 7/8-14 SAE ports

TG0405US080AAAA

• Parker TG Series
• 405 cm³/rev displacement
• Wheel mounting configuration
• 1-1/4 in tapered shaft configuration
• Exact interface details should be confirmed using the complete ordering code.

Key Technical Advantages

High Volumetric Efficiency

The Parker TG architecture is specified for high volumetric efficiency, helping maintain consistent hydraulic-to-mechanical power conversion while minimizing the effects of internal leakage.

High Starting Torque

TG motors are engineered for high starting torque, making the TG0405 suitable for heavy-load startup conditions where conventional low-torque motors may struggle to overcome initial resistance.

Full-Flow Spline Cooling

The TG design incorporates full-flow spline cooling to assist heat removal and lubrication around the drivetrain during sustained operation.

High-Pressure Shaft Sealing

A high-pressure shaft seal combined with high-flow shaft-seal cooling supports reliable output-shaft operation in demanding hydraulic environments.

High Side-Load Capability

The TG Series is specifically described by Parker as having high side-load capacity, making it particularly relevant to wheel drives, sprocket drives and other mechanically loaded applications.

Heavy-Duty Low-Speed High-Torque Architecture

The 405 cm³/rev displacement and 942 Nm continuous torque rating place the TG0405 firmly in the low-speed, high-torque category. It is therefore better suited to controlled heavy-duty rotary motion than applications requiring very high shaft speed.

Precision Replacement Engineering

For interchangeable replacement production, critical engineering dimensions include the Gerotor working clearances, drive-shaft interface, bearing alignment, mounting flange geometry, port interface and sealing surfaces. These interfaces should be controlled through precision machining and final assembly inspection, followed by simulated operating-condition testing.

Application Areas

Typical application environments include:

• Construction machinery
• Wheel loaders
• Backhoe loaders
• Forklifts and telehandlers
• Agricultural machinery
• Forestry equipment
• Material handling systems
• Conveyor drives
• Mobile hydraulic equipment
• Hydraulic wheel-drive systems
• Auxiliary drive systems

Parker’s mobile-hydraulic documentation identifies equipment such as drill rigs, dump trucks, telehandlers, forklifts, forest machines, wheel loaders, backhoe loaders, refuse collection vehicles and forest cranes among its representative mobile equipment applications.

Final application compatibility should always be verified using the complete motor ordering code, hydraulic circuit requirements and mechanical load conditions.

Expert Maintenance Tips

1. Match the complete ordering code

Do not select a replacement only by the TG0405 frame size. Confirm the full part number, mounting configuration, shaft type, port specification, rotation and sealing configuration.

2. Respect the continuous/intermittent pressure limits

TG0405 is rated at 172 bar continuous differential pressure and 241 bar intermittent differential pressure, while the maximum supply pressure is 300 bar. These values have different engineering meanings and should not be treated as interchangeable limits.

3. Keep shaft speed within the published range

The Parker reference maximum operating speed for TG0405 is 232 rpm. Flow should therefore be sized around the required speed and actual motor efficiency rather than simply increasing pump flow.

4. Inspect the shaft and seal area regularly

Check shaft seals, shaft wear, bearing play, key or spline wear, mounting hardware and hydraulic-port sealing, particularly when the motor operates under significant side loading.

5. Commission the replacement motor progressively

After installation, start at low pressure and low flow, confirm correct rotation and purge trapped air before applying full hydraulic load. This helps reduce the risk of abnormal heating, cavitation and premature wear.