TG0625MS050AAAB Parker Torqmotor 623cc 2250psi LSHT

Product Overview

The TG0625MS050AAAB belongs to the Parker Torqmoter™ TG Series of medium-duty orbital hydraulic motors – a robust, high-power-density Low Speed High Torque (LSHT) motor. The model code breaks down as follows: TG denotes the TG Series medium-duty motor; 0625 indicates the displacement code (623 cm³/rev); MS specifies the mounting and shaft configuration; 050 denotes the internal specification code; AAAB specifies porting and rotation direction.

The TG Series is the workhorse of Parker’s orbital motor product line, positioned as the medium-duty solution between the TH Series (light-duty) and TL Series (heavy-duty). As a direct OEM alternative to Parker TG Series motors, this product is manufactured to strict Parker original specifications, featuring 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 – is an extra heavy-duty component featuring patented 60:40 spline geometry, with rugged construction allowing transmission of over 13,000 lb-in of torque. 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.

Technical Specifications

TG0625MS050AAAB (Specific Model)

• Model Number: TG0625MS050AAAB

• Parker Part Number: 968492-0001

• Series: Torqmotor™ TG Series (Medium Duty)

• Geometric Displacement: 623 cm³/rev (38.0 in³/rev)

• Max Differential Pressure (Continuous/Intermittent): 121 bar (1750 PSID) / 155 bar (2250 PSID)

• Maximum Supply Pressure: 300 bar (4350 PSIG)

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

• Min Starting Torque (Continuous/Intermittent): 895 N·m (7924 lb-in) / 1165 N·m (10312 lb-in)

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

• Maximum Speed: 182 RPM

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

• Maximum Output Power: 20 kW (27 HP)

• Nominal Shaft Diameter: 1.25 inch (31.75 mm)

• Mounting: MS Configuration (Wheel/Flange Mount available)

• Porting: 7/8″-14 SAE

• Shaft Type: 1.25″ Splined or Tapered (per configuration code)

• Rotation: Bi-rotational (Standard/Reverse optional)

• Housing Material: High-strength Cast Iron

• Weight: Approx. 9.7 kg

TG Series (Full Series Specifications)

• Displacement Range: 141 – 959 cm³/rev (8.6 – 58.5 in³/rev)

• Torque Range: 400 – 925 N·m (Continuous)

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

• Max Flow Rate (Continuous/Intermittent): 76 / 114 L/min

• Maximum Speed: 118 – 660 RPM

• Max Dynamic Side Load: 3600 lb at key

• Shaft Sizes: Up to 1.375-inch nominal

TH / TL Series (Series Comparison Reference)

• TH Series (Light Duty): Displacement 140+ cm³/rev – ideal for vehicle propulsion, augers, chain drives, winches, and boom rotate

• TL Series (Heavy Duty): Displacement 140–958 cm³/rev, Torque 400–925 N·m, Speed 118–660 RPM

• TG Series (Medium Duty): Positioned between TH and TL – balancing power density with compact construction

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 the TG0625MS050AAAB displacement class, this translates to 1,291 N·m of torque at 155 bar 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 623 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.

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.

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, compact excavators

• 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.

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