TG0335EB451AAAA Parker Torqmotor TG Medium Duty Motor 335cc

Product Overview

The TG0335EB451AAAA is a Parker Torqmotor™ TG Series medium-duty low-speed, high-torque (LSHT) orbital hydraulic motor with a displacement of approximately 335 cm³/rev. As the seventh displacement size in the TG Series lineup — Parker‘s flagship medium-duty gerotor motor platform — this motor delivers significantly higher torque output, radial load capacity, and pressure rating than the light-duty TB and TE Series.

This configuration features a 6-bolt magneto flange mount, a 32 mm straight shaft, and 1/2” BSP side ports, making it ideally suited for agricultural machinery and general industrial drive applications. The engineering centerpiece of the TG Series is Parker‘s patented continuous oil flow across splines design, directing hydraulic fluid continuously across the spline interface between the rotor and drive coupling while washing the entire powertrain — including the torque link and thrust bearings. The torque link features Parker’s patented 60:40 internal-to-external spline geometry, transmitting over 13,000 lb-in of torque in a lighter, more compact package.

A high-pressure shaft seal is fitted as standard, completely eliminating the need for a case drain line and simplifying hydraulic circuit design. Every unit is manufactured to exact Parker original specifications and undergoes 100% simulated load testing prior to shipment.

Technical Specifications 

• Model Number: TG0335EB451AAAA

• Brand / Series: Parker Torqmotor™ TG Series

• Motor Type: Medium-Duty Low-Speed High-Torque (LSHT) Orbital Motor

• Geometric Displacement: Approx. 335 cm³/rev (nominal)

• Series Displacement Range: 141 – 959 cm³/rev

• Continuous Pressure Differential: 207 bar (3000 psi)

• Intermittent (Peak) Pressure Differential: 276 – 280 bar (4000 psi)

• Maximum Continuous Flow: 76 L/min (20 GPM)

• Maximum Intermittent Flow: 114 L/min (30 GPM)

• Maximum Continuous Speed: Approx. 227 RPM

• Maximum Intermittent Speed: Approx. 340 RPM

• Maximum Intermittent Output Torque: Approx. 2000 Nm

• Nominal Shaft Diameter: 32 mm straight shaft

• Mounting Flange: 6-Bolt Magneto Flange

• Port Size: 1/2“ BSP side ports

• Max. Dynamic Radial Load: 16,013 N (3,600 lbs) at keyway

• Housing Material: Cast Iron

• Shaft Seal: High-Pressure Shaft Seal (standard)

• Rotation: Bi-directional

• Design & Manufacture: Greeneville, TN USA

• Weight: Approx. 20 – 22 kg

Key Technical Advantages

1. Continuous Oil Flow Across Splines — Full Powertrain Lubrication Protection

The engineering centerpiece of the TG Series is its patented continuous oil flow across splines design. Hydraulic fluid is continuously directed across the spline interface between the rotor and drive coupling during operation, while simultaneously washing the entire powertrain in cool, high-flow fluid. The torque link features Parker’s patented 60:40 spline geometry, transmitting over 13,000 lb-in of torque in a lighter, more compact package. This full-flow washing architecture maintains a stable hydrodynamic lubricating film on the spline tooth surfaces, effectively reducing friction coefficient and fretting wear — a critical advantage in sustained high-load duty cycles such as earth augers and winches.

2. High-Pressure Shaft Seal and Case-Drain-Free Design — Simplified Hydraulic Architecture

The TG0335EB451AAAA comes equipped with a high-pressure shaft seal rated for intermittent pressures up to 280 bar. This design completely eliminates the need for a case drain line, simplifying hydraulic circuit layout and reducing potential leak paths. Parker notes that this design “eliminates the need for a case drain,” thereby reducing the need for hoses and fittings and saving costs for machine builders.

3. High Side-Load Capacity — Optimized for Chain and Gear Drives

The TG Series features a 32 mm nominal shaft capable of withstanding dynamic radial loads up to 16,013 N (3,600 lbs) at the keyway. This load capacity makes the motor particularly suited to chain sprocket, gear, or pulley-driven output systems found in vehicle propulsion, winch, and conveyor applications.

4. Precision Machining and High Volumetric Efficiency — Sustained Output Reliability

The rotor, stator, and commutator plate are manufactured using precision CNC machining, with critical mating surface tolerances controlled to micron-level accuracy. Empirical testing confirms volumetric efficiency exceeding 90% under rated conditions, with stable speed and torque output maintained even after extended continuous operation. The TG Series is designed and manufactured at Parker‘s Greeneville, TN facility, adhering to Parker’s global quality control standards.

Application Areas

• Vehicle Propulsion: Wheel drives, chain drives, propel systems

• Agricultural Machinery: Combine header drives, specialty harvesters, sprayers, post-hole augers

• Construction Equipment: Trenchers, skid steer attachments, mini skid steers, earth augers

• Material Handling: Conveyors, winches, wood chippers, boom rotate drives

• Turf & Municipal Equipment: Zero-turn radius mowers, golf course maintenance, sweepers, snow removal

• Aerial Work Platforms: Scissor lifts, aerial work platforms

• Oil & Gas: Blender truck drives

• Forestry & Mining: Wood chipper feed rollers, mining equipment drives

Expert Maintenance Tips

Installation: Before mounting, verify that the 6-bolt magneto flange pilot diameter and mounting face tolerance conform to Parker specifications. The pilot should enter the mating bore without force. Shaft-to-coupling alignment must be held within 0.05 mm radial deviation. For 1/2“ BSP side ports, tighten to specified torque values. Since the TG Series requires no case drain line, no drain port plumbing is necessary during installation.

Break-In Procedure: After initial installation, operate the motor at no load and 50% rated pressure for 15–20 minutes to allow the running surfaces to seat properly. Monitor return oil temperature during break-in; a rise exceeding 30°C above ambient indicates a potential issue. After break-in, drain the reservoir and replace the filter element.

Routine Maintenance: Inspect the high-pressure shaft seal area regularly for signs of weeping or leakage. Maintain hydraulic fluid cleanliness at NAS Class 8 or ISO 18/15 or better. Maximum operating temperature should not exceed 93.3°C (200°F). A preventive inspection is recommended every 2,000 operating hours or 12 months, whichever comes first, focusing on spline wear measurement, commutator surface condition, and shaft seal lip integrity.