TG0335 Parker Gerotor Hydraulic Motor 337 cc/rev

Product Overview

The Parker TG0335 is a fixed-displacement Gerotor / LSHT hydraulic motor designed for low-speed, high-torque hydraulic drive applications. Parker’s official TG documentation specifies a geometric displacement of 337 cm³/rev (20.6 in³/rev), a maximum operating speed of 277 rpm, and a maximum continuous differential pressure of 207 bar / 3,000 psi.

The TG architecture incorporates several heavy-duty design features, including high starting torque, high volumetric efficiency, high side-load capability, full-flow drivetrain cooling, high-pressure shaft sealing and cooled shaft-seal operation. Parker also specifies a heavy-duty torque link with patented 60:40 spline geometry for high torque transmission.

The supplied configurations include TG0335MW440AAAB and TG0335HW460AAAA. Both use the TG0335 displacement group, but their mechanical interfaces are different. The MW configuration uses a standard SAE “A” four-bolt flange with G1/2 milled porting and shaft code 44, while HW is a wheel-mount configuration with a machined pilot nose, G1/2 milled port face and shaft code 46.

For OEM replacement and MRO applications, the complete ordering code should always be matched before installation.

Technical Specifications

• Brand: Parker Hannifin
• Series: TG Series
• Motor Type: Fixed-Displacement Gerotor / LSHT Hydraulic Motor
• Geometric Displacement: 337 cm³/rev
• Displacement: 20.6 in³/rev
• Maximum Continuous Differential Pressure: 207 bar / 3,000 psi
• Maximum Intermittent Differential Pressure: 276 bar / 4,000 psi
• Maximum Supply Pressure: 300 bar / 4,350 psi
• Maximum Continuous Flow: 76 L/min / 20 GPM
• Maximum Intermittent Flow: 95 L/min / 25 GPM
• Maximum Operating Speed: 277 rpm
• Maximum Continuous Torque: 964 Nm / 8,533 lb-in
• Maximum Intermittent Torque: 1,297 Nm / 11,479 lb-in
• Maximum Continuous Output Power: 30 kW
• Maximum Intermittent Output Power: 41 kW
• Control: Fixed displacement; motor speed is primarily controlled by hydraulic flow
• Intermittent Rating: Maximum intermittent rating applies to 10% of every minute according to Parker documentation.

TG0335MW440AAAB

• Displacement: 337 cm³/rev
• Mounting Code: MW
• Mounting: Standard SAE “A” 4-bolt flange
• Porting: G1/2 milled port
• Shaft Code: 44
• Shaft: 14-tooth spline, 12/24 pitch, 12 mm tapped
• Configuration: Industrial and mobile hydraulic applications requiring a standard flange and manifold-style port arrangement.

TG0335HW460AAAA

• Displacement: 337 cm³/rev
• Mounting Code: HW
• Mounting: Wheel mount with machined pilot nose
• Porting: G1/2 (1/2 BSPP) milled port face
• Shaft Code: 46
• Shaft: 32 mm keyed
• Application: Wheel-mounted and mechanically loaded hydraulic drive systems
• Cross-reference: The complete part number is documented as a Parker motor in equipment parts documentation.

Key Technical Advantages

High Starting Torque

The TG0335 is designed for low-speed, high-torque operation and provides up to 964 Nm continuous torque at its maximum continuous differential pressure rating. This makes it suitable for machinery requiring strong startup performance under mechanical load.

Heavy-Duty Torque Transmission

Parker identifies a heavy-duty torque link with patented 60:40 spline geometry in the TG powertrain. This drivetrain architecture is designed to transmit high torque while maintaining durability under demanding operating conditions.

Continuous Internal Fluid Cooling

The complete powertrain is continuously washed with cool, high-flow hydraulic fluid. This improves heat management around rotating components and supports long operating life in demanding duty cycles.

Smooth Low-Speed Performance

Parker specifies roller vanes and a sealed commutator to maintain efficiency and smooth low-speed motor operation. This is particularly valuable in hydraulic drives requiring stable rotation rather than high shaft speed.

High Side-Load Capability

The TG platform is designed for significant side loading. Parker’s technical material provides side-load calculations based on bearing L10 life according to ISO 281, while the maximum load curve must not be exceeded even under shock loading.

High-Pressure Shaft-Sealing System

The TG architecture includes a high-pressure shaft seal and shaft-seal cooling provisions, helping protect the output shaft area under demanding hydraulic and mechanical operating conditions.

Precision Replacement Engineering

For TG0335MW440AAAB and TG0335HW460AAAA replacement programs, engineering control should extend beyond external dimensions to Gerotor clearances, commutation surfaces, shaft alignment, mounting pilot geometry, port interfaces, key/spline engagement and shaft-seal dimensions.

Our replacement production process focuses on these critical interfaces and incorporates 100% simulated working-condition testing to validate flow, pressure, speed and load performance before shipment.

Application Areas

The Parker TG0335 is suitable for:

• Construction Machinery
• Wheel Drive Systems
• Excavator Auxiliary Drives
• Forestry Equipment
• Agricultural Machinery
• Material Handling Equipment
• Conveyor Drives
• Winch Drive Systems
• Road Construction Equipment
• Mobile Hydraulic Machinery
• Industrial Rotary Drives
• Heavy-Duty Hydraulic Transmission Systems

The HW wheel-mount configuration is particularly relevant to machines requiring wheel-drive interfaces and substantial mechanical loading. Equipment documentation also identifies TG0335HW460AAAA as a Parker motor used in hydraulic swing-drive equipment.

Expert Maintenance Tips

Match the Complete Ordering Code

Do not select a replacement based only on “TG0335.” Always verify:

• Mounting configuration
• Port configuration
• Shaft code
• Shaft dimensions
• Rotation requirements
• Mechanical interface
• Seal arrangement

For example, MW44 and HW46 are different configurations, despite sharing the TG0335 displacement group.

Respect Continuous and Intermittent Pressure Limits

TG0335 is rated at:

• 207 bar continuous differential pressure
• 276 bar intermittent differential pressure
• 300 bar maximum supply pressure

Parker specifies intermittent operation for only 10% of every minute, so 276 bar should not be treated as a continuous operating pressure.

Control Flow According to the Speed Requirement

The TG0335 maximum operating speed is 277 rpm. Hydraulic flow should therefore be selected according to the required motor speed, actual efficiency, load pressure, oil temperature and system losses rather than simply increasing pump flow.

Inspect the Mechanical Interface

For TG0335HW460AAAA, regularly inspect the machined pilot, wheel mounting interface, 32 mm keyed shaft, keyway and shaft-side loading. Parker’s side-load calculations are related to bearing L10 life, so the mechanical load position is as important as the hydraulic pressure.

Commission Gradually After Replacement

After installation, fill and purge the hydraulic circuit, verify rotation direction, run the motor at low flow and low pressure, inspect for leakage, and increase the load progressively. This reduces the risk of air-related damage, abnormal heating and mechanical shock during commissioning.