TG0625EW440AAAA Parker Hydraulic Orbital Motor

Product Overview

The Parker TG0625 Torqmotor™ is a high-displacement LSHT (Low-Speed High-Torque) orbital hydraulic motor designed for hydraulic systems requiring high starting torque, stable low-speed operation and reliable power transmission under demanding loads.

The requested configurations include:

• TG0625EW440AAAA
• TG0625EW440AAAB
• TG0625MS050AAAB
• TG0625EN440AAAB

The TG0625 platform has a Parker-published geometric displacement of 623 cm³/rev (38.0 in³/rev). Parker’s official TG Series data specifies 121 bar / 1,750 psi continuous differential pressure, 155 bar / 2,250 psi intermittent differential pressure, and 300 bar / 4,350 psi maximum supply pressure.

The TG Series is an LSHT Torqmotor platform rather than an axial piston motor. Parker highlights its heavy-duty torque link, patented 60:40 spline geometry, roller vanes, sealed commutator and continuous powertrain flushing for cooling and lubrication.

For replacement applications, the complete ordering code should be matched against the original motor because mounting, porting, shaft, rotation and options can differ between configurations.

Technical Specifications

TG0625 Platform

• Brand: Parker Hannifin
• Product Family: Torqmotor™ TG Series
• Product Type: LSHT Orbital Hydraulic Motor
• Motor Type: Fixed Displacement
• Model: TG0625
• Geometric Displacement: 623 cm³/rev
• Displacement: 38.0 in³/rev
• Maximum Speed: 182 rpm
• Maximum Continuous Differential Pressure: 121 bar / 1,750 psi
• Maximum Intermittent Differential Pressure: 155 bar / 2,250 psi
• Maximum Supply Pressure: 300 bar / 4,350 psi
• Maximum Continuous Flow: 76 L/min / 20 gpm
• Maximum Intermittent Flow: 114 L/min / 30 gpm
• Maximum Continuous Torque: 986 Nm / 8,727 lb-in
• Maximum Intermittent Torque: 1,291 Nm / 11,424 lb-in
• Maximum Performance: 20 kW / 27 HP
• Minimum Starting Torque, Continuous: 895 Nm
• Minimum Starting Torque, Intermittent: 1,165 Nm
• Maximum Side Load at Key: Up to 16,000 N / 3,597 lb
• Control Method: Fixed displacement; hydraulic flow controls speed while differential pressure determines available torque.

Parker notes that intermittent ratings apply to 10% of each minute. Catalog performance data is based on testing with 10W40 oil at 200 SUS and 54°C / 130°F, and actual production performance may vary slightly.

Configuration Identification

• TG0625EW440AAAA
• TG0625EW440AAAB
• TG0625MS050AAAB
• TG0625EN440AAAB

Parker’s official ordering information confirms:

• 0625: 623 cm³/rev displacement
• MS: Magneto mounting, 7/8-14 SAE
• 05: 1-1/4″ 14-tooth spline shaft
• 44: 14-tooth spline, 12/24 pitch, 12 mm tapped configuration
• AAAA: Standard, Black Paint
• AAAB: Standard, No Paint
• 0: Standard rotation

For the EW and EN combinations, the exact complete-code definition is not explicitly listed in the current public Parker ordering page reviewed here. These configurations should therefore be verified from the motor nameplate or the original Parker quotation/catalog rather than inferred.

Weight

Parker’s dimensional data shows that TG0625 weight depends on the mounting configuration:

• TG0625 MS: 18.6 kg / 41.1 lb
• TG0625 US: 19.0 kg / 41.8 lb
• TG0625 WE: 22.0 kg / 48.4 lb

The weight of the exact EW/EN configurations should be confirmed against the specific configuration drawing.

Key Technical Advantages

1. High-Displacement LSHT Architecture

With 623 cm³/rev geometric displacement, TG0625 is engineered for high torque at low rotational speed.

Parker specifies:

• 986 Nm continuous maximum torque
• 1,291 Nm intermittent maximum torque
• 182 rpm maximum speed

This characteristic makes the motor particularly suitable for heavy low-speed rotary drives.

2. 60:40 Spline Geometry

The TG powertrain uses Parker’s patented 60:40 spline geometry within the torque link. Parker describes the TG powertrain as a heavy-duty design capable of transmitting more than 13,000 lb-in of torque.

From an engineering perspective, this geometry is intended to improve torque transmission and durability under repeated load cycles and mechanical shock.

3. Roller Vanes and Sealed Commutator

Parker specifically identifies roller vanes and a sealed commutator as important TG Series design elements.

These features support:

• Reduced friction
• Controlled internal leakage
• High volumetric efficiency
• Smooth low-speed performance
• Stable torque generation

4. Continuous Powertrain Cooling and Lubrication

The TG powertrain is continuously washed with high-flow working fluid to help provide cooling and lubrication.

This design approach contributes to:

• Lower internal temperature
• Reduced wear
• Better lubrication
• Longer powertrain service life

5. High Side-Load Capability

The TG Series provides up to 16,000 N / 3,597 lb side load at the key under the catalog-defined conditions.

This is valuable for direct mechanical drives involving sprockets, gears, pulleys and wheels.

However, actual shaft loading must still be calculated according to radial load, axial load, load position, speed and bearing life.

6. Simple Fixed-Displacement Hydraulic Integration

TG0625 uses a fixed-displacement architecture. There is no integrated variable-displacement servo control.

In a hydraulic system:

Flow primarily determines motor speed, while:

Differential pressure primarily determines available output torque.

This makes the architecture relatively straightforward for mobile and industrial hydraulic drive applications.

Application Areas

Construction and Road Machinery

• Construction machinery
• Asphalt pavers
• Road construction equipment
• Sweepers
• Mobile hydraulic machinery
• Material handling equipment

Public product references also associate TG0625EW440AAAA with asphalt-paving equipment, supporting its relevance to road-construction machinery.

Agricultural and Forestry Machinery

• Agricultural machinery
• Harvesting equipment
• Forestry machinery
• Augers
• Agricultural conveyors
• Feed-handling systems

Industrial Equipment

• Conveyor systems
• Chain drives
• Sprocket drives
• Industrial rotary machinery
• Heavy-duty material handling
• Hydraulic winches

Expert Maintenance Tips

1. Match the Complete Part Number

Do not replace a motor based only on TG0625.

Always verify:

• Mounting
• Porting
• Shaft
• Rotation
• Options
• Mechanical dimensions

For this product family, the following should be treated as separate configuration references:

TG0625EW440AAAA
TG0625EW440AAAB
TG0625MS050AAAB
TG0625EN440AAAB

2. Check Hydraulic Flow Against Motor Speed

The TG0625 maximum speed is 182 rpm, with 76 L/min continuous flow and 114 L/min intermittent flow according to Parker’s published data.

Initial system sizing should relate flow to displacement and then account for volumetric losses and actual load conditions.

3. Control Pressure Spikes

TG0625 is rated at:

• 121 bar continuous differential pressure
• 155 bar intermittent differential pressure

Hydraulic shock caused by sudden load changes, directional reversal and valve switching should therefore be considered during circuit design.

4. Evaluate External Shaft Loads

When the motor drives a sprocket, gear, pulley or wheel, evaluate:

• Radial shaft load
• Axial shaft load
• Load application distance
• Shaft speed
• Bearing life

Parker provides bearing-life and allowable side-load information within the TG technical documentation.

5. Maintain Proper Oil Quality and Temperature

Because Parker’s catalog performance is established under a defined oil viscosity and temperature condition, hydraulic-fluid cleanliness, viscosity and temperature should be controlled during operation.

Routine inspection should include:

• Hydraulic-fluid cleanliness
• Oil viscosity
• Oil temperature
• Filter condition
• Return-line restriction
• Pressure spikes

6. Use 100% Simulated Operating-Condition Testing

For replacement TG0625 motors, recommended factory QA should include:

• Displacement verification
• Pressure testing
• Flow testing
• Speed testing
• Torque testing
• Starting-torque testing
• Internal leakage testing
• Rotation-direction testing
• Shaft runout inspection
• Bearing/load verification
• Temperature-rise testing
• Noise and vibration inspection
• Complete configuration verification

The target should be true drop-in interchangeability, combining dimensional compatibility with hydraulic performance and functional reliability.