TG0335MS030AAAA Parker Torqmotor 337cc 4000psi

Product Overview

The TG0335MS030AAAA, TG0405US081AAMF, TG0625EW440AAAB, and TG0240MS030AAAB belong to the Parker Torqmoter™ TG Series of medium-duty orbital hydraulic motors – robust, high-power-density Low Speed High Torque (LSHT) motors. The TG Series is one of Parker’s most representative medium-duty product lines within the TE, TF, TG, and TL series portfolio.

Parker Torqmoter™ Series Positioning:

• TE Series (Light Duty): Displacement 36–392 cm³/rev, 1″ nominal shaft, 1,500 lb side load capacity, intermittent pressure to 2,750 psi

• TF Series (Medium Duty): Displacement 80–475 cm³/rev, 1.25″ nominal shaft, 4,000 lb side load (flange) / 6,000 lb (wheel mount), intermittent pressure to 4,000 psi, torque to 8,100 lb-in

• TG Series (Medium Duty): Displacement 140–960 cm³/rev, shaft up to 1.375″, intermittent pressure to 4,000 psi, torque to 1,490 N·m

• TL Series (Heavy Duty): Displacement 140–958 cm³/rev, 3,600 lb side load capacity, ideal for heavy-duty applications

Manufactured to strict Parker original specifications, this product features 100% form-fit-function interchangeability – mounting dimensions, port configurations, and shaft styles are fully identical to original Parker TG series motors, requiring zero modifications for direct replacement. Every motor undergoes 100% simulated duty-cycle testing prior to shipment, with performance validation conducted at rated pressure, flow, and actual load conditions.

The heart of Parker’s TG Series powertrain – the torque link – features patented 60:40 spline geometry. The entire powertrain is continuously washed in cool, high-flow fluid to assure long life. Roller vanes and sealed commutator maintain high efficiency and provide smooth low-speed performance.

Model Code Breakdown:

• TG: Torqmoter™ TG Series medium-duty motor

• 0335 / 0405 / 0625 / 0240: Displacement code (cm³/rev)

• MS / US / EW: Mounting configuration (MS=Magneto Mount, US=US Standard, EW=Wheel Mount)

• 030 / 081 / 440: Shaft and internal specification code

• AAAA / AAMF / AAAB: Porting and rotation configuration

Technical Specifications

TG0335MS030AAAA

• Model Number: TG0335MS030AAAA

• Series: Torqmoter™ TG Series (Medium Duty)

• Geometric Displacement: 337 cm³/rev (20.6 in³/rev)

• Max Differential Pressure (Continuous/Intermittent): 207 bar (3000 PSID) / 276 bar (4000 PSID)

• Maximum Supply Pressure: 300 bar (4350 PSIG)

• Max Torque (Continuous/Intermittent): 964 N·m (8533 lb-in) / 1297 N·m (11479 lb-in)

• Min Starting Torque (Continuous/Intermittent): 843 N·m (7458 lb-in) / 1117 N·m (9889 lb-in)

• Max Flow Rate (Continuous/Intermittent): 76 L/min (20 GPM) / 95 L/min (25 GPM)

• Maximum Speed: 277 RPM

• Max Dynamic Side Load at Key: 16000 N (3597 lb)

• Maximum Output Power: 30 kW (41 HP)

• Shaft Type: 1.25″ Keyed

• Mounting: Magneto Mount

• Porting: 7/8″-14 SAE

• Weight: Approx. 15.0 kg

TG0405US081AAMF

• Model Number: TG0405US081AAMF

• Series: Torqmoter™ TG Series (Medium Duty)

• Geometric Displacement: 405 cm³/rev

• Max Operating Pressure (Continuous): 170 bar

• Max Flow Rate (Continuous): 75 L/min

• Maximum Speed: Approx. 680 RPM

• Maximum Torque: 9239 lb-in

• Shaft Type: 1.25″ Nominal

• Porting: BSP threads

• Weight: Approx. 18.3 kg

TG0625EW440AAAB

• Model Number: TG0625EW440AAAB

• Series: Torqmoter™ TG Series (Medium Duty)

• Geometric Displacement: 625 cm³/rev (38.0 in³/rev)

• Max Operating Pressure (Continuous): 120 bar

• Max Flow Rate (Continuous): 75 L/min

• Maximum Speed: Approx. 182 RPM

• Max Torque (Continuous/Intermittent): 986 N·m (8727 lb-in) / 1291 N·m (11424 lb-in)

• Max Dynamic Side Load at Key: 16000 N (3597 lb)

• Mounting: Wheel Mount (EW Configuration)

• Weight: Approx. 18.1 kg

TG0240MS030AAAB

• Model Number: TG0240MS030AAAB

• Series: Torqmoter™ TG Series (Medium Duty)

• Geometric Displacement: 240 cm³/rev

• Max Differential Pressure (Intermittent): 276 bar (4000 PSI)

• Max Dynamic Side Load at Key: 3600 lb

• Mounting: Magneto Mount (MS Configuration)

TG Series (Full Series Specifications)

• Displacement Range: 140 – 960 cm³/rev (8.6 – 58.5 in³/rev)

• Standard Displacements: TG0140, TG0170, TG0195, TG0240, TG0280, TG0310, TG0335, TG0360, TG0405, TG0475, TG0530, TG0625, TG0785, TG0960

• Max Pressure Differential (Continuous/Intermittent): 69–207 bar / 103–276 bar

• Max Flow Rate (Continuous/Intermittent): 76 L/min (20 GPM) / 95–114 L/min (25–30 GPM)

• Maximum Speed: 118–660 RPM (at intermittent flow)

• Max Output Torque (Continuous/Intermittent): 390–773 N·m / 530–1268 N·m

• Min Starting Torque (Continuous/Intermittent): 315–763 N·m / 418–1177 N·m

• Max Dynamic Side Load: 3600 lb at key

• Shaft Sizes: 1.25″ nominal (other sizes available)

Key Technical Advantages

1. Patented 60:40 Spline Geometry – The Torque Transmission Breakthrough

The heart of the TG Series powertrain – the torque link – features Parker’s patented 60:40 spline geometry. This innovative design significantly optimizes spline load distribution, eliminating stress concentration issues found in conventional 50:50 splines, enabling torque transmission exceeding 13,000 lb-in. For large-displacement models like the TG0625, this translates to peak torque output of up to 1,490 N·m at intermittent pressure.

2. Continuous Spline Oil Flow Flushing – Active Cooling & Long-Life Lubrication

The entire powertrain is continuously washed in cool, high-flow fluid. This design ensures that internal splines and all friction interfaces receive constant lubrication and heat dissipation. For a 625 cc displacement motor, continuous oil flow flushing effectively prevents localized overheating under high-load conditions, significantly extending overall motor life.

3. Roller Vanes & Sealed Commutator – High Efficiency & Smooth Low-Speed Performance

The roller vane rotor set and sealed commutator design reduce internal friction losses and control internal leakage, maintaining high volumetric efficiency across the full speed range. The combination delivers smooth operation even at extra-low speeds, with minimum stable speeds as low as 5–10 RPM.

4. High-Pressure Shaft Seal & No Case Drain Required – System Simplification Innovation

A high-pressure shaft seal comes as standard. This innovative design eliminates the need for a case drain. For end users, this means simplified plumbing layouts, fewer potential leak points, lower installation costs, and easier system maintenance.

5. Superior Side Load Capacity – The Enabler for Direct-Drive Applications

The TG Series supports up to 3,600 lb (16,000 N) of dynamic side load at the key. This capability, enabled by a reinforced drive shaft and bearing system, allows the motor to directly withstand radial loads from belt drives, sprockets, or wheels without requiring external support bearings. The TF Series offers even higher side load capacity of 6,000 lb in wheel mount configurations.

Application Areas

• Vehicle Propulsion: Zero-turn mowers, golf course maintenance equipment, mini and walk-behind skid steers

• Agricultural Machinery: Combine harvesters (header drives), specialty harvesters for potato, tomato, nuts, leafy vegetables, sugar, cotton, coffee, and grapes

• Forestry Equipment: Feller bunchers, wood chippers

• Construction Attachments: Skid steer attachments, trenchers

• Material Handling: Conveyors, winches

• Municipal & Grounds Maintenance: Sweepers, snow removal equipment, salt and sand spreaders

• Oil & Gas: Blender trucks

• Industrial Applications: Augers, portable irrigation systems, pipe spinners

Expert Maintenance Tips

1. Pre-Installation Cleaning & Inspection

TG Series orbital motors are highly sensitive to fluid cleanliness. Thoroughly clean all piping and fittings prior to installation to ensure no metal chips, sand particles, weld slag, or other contaminants remain. Recommended system filtration: ISO 4406 18/16/13 or better. Contaminants accelerate wear on the commutator and roller vane rotor sets, leading to rapid loss of volumetric efficiency.

2. Coupling Alignment & Side Load Management

Although the TG Series offers side load capacity up to 3,600 lb, proper alignment of belt drives, sprockets, or couplings remains critical. Excessive misalignment causes uneven bearing loading and shortens bearing life. Never use hammers to install pulleys or sprockets – use appropriate press-fit tools.

3. Hydraulic Fluid Cleanliness & Viscosity Control

Recommended operating viscosity range for TG Series motors: 50 – 7500 SUS. High oil temperatures reduce viscosity and cause insufficient lubrication; low temperatures cause starting difficulties. Regularly inspect fluid condition and perform oil and filter changes every 500 hours or per equipment manufacturer recommendations.

4. First Start-Up & Air Bleeding – The Critical Break-In Procedure

After installation, bleed air from the system through a loosened outlet fitting. Run the motor at low speed under no load for 5-10 minutes to ensure complete system air bleeding and proper oil film establishment on all lubrication surfaces. Gradually apply load to reach rated operating conditions. Although each motor undergoes 100% simulated duty-cycle testing at the factory, a proper break-in procedure will further extend service life.

5. No Case Drain Required – But Monitor Case Pressure

The TG Series uses a high-pressure shaft seal design that eliminates the need for an external case drain. However, ensure that internal case pressure does not exceed the shaft seal’s maximum rating (maximum supply pressure 300 bar) – avoid conditions that could cause excessive case pressure buildup under extreme operating scenarios.