Product Overview
The 112A-106-AT-1-E-01 is a classic model in the Parker Nichols IGR 112A Series of low-speed high-torque gerotor hydraulic motors, featuring a geometric displacement of 174 cm³/rev within the Nichols™ 110A/112A product line. The series employs an innovative solid one-piece shaft design that eliminates the torque coupling found in conventional orbit motors, fundamentally removing spline stress concentration — dramatically extending bearing and spline service life while improving resistance to rapid reversals.
The 112A-106-AT-1-E-01 uses IGR (Internal Gear Rotor) orbit motor construction with pressure-loaded power elements and a wear compensation design, maintaining high volumetric efficiency throughout its operating life. This model is designed and manufactured at Parker’s Greeneville, Tennessee facility in the USA.
The motor is a direct drop-in replacement for Parker Nichols 112A Series OEM motors of matching specification, with fully interchangeable mounting flange, shaft, and port locations. Every unit undergoes 100% simulated load-condition bench testing before shipment.
Technical Specifications
112A-106-AT-1-E-01
Model: 112A-106-AT-1-E-01 (Parker Nichols IGR 112A Series)
Series: 112A Series (110A/112A platform)
Displacement: 174 cm³/rev (nominal 106 size)
Max Continuous Working Pressure: 155 bar
Max Continuous Output Torque: 380 N·m
Max Speed: 654 rpm
Control Type: IGR orbit commutation; bidirectional rotation; speed infinitely adjustable via hydraulic flow
Mounting Flange: SAE-A 2-bolt, 82.5 mm pilot diameter
Output Shaft: Ø25 mm cylindrical keyed (Stainless Steel)
Port Configuration: SAE O-ring ports, side ports staggered
Bearing Type: Solid one-piece integrated shaft support, rated for up to 1450 lb (approx. 658 kg) dynamic side load
Material: Cast iron housing
Weight: Approx. 8.4 kg (112A-106 reference)
Design & Manufacture: Greeneville, TN USA
Data source: Parker Nichols 110A/112A Series official specification table (dgguanglian.com), Hidraoil distributor technical data, and Lunsuo distributor product data. Simultaneous operation at maximum speed and maximum pressure is not permitted.
Series Model Notes:
112A-036-AY-0-03: 112A Series small displacement, approx. 59 cm³/rev, 2-bolt SAE-A flange, for compact drive systems
112A-088-AP-0-S: 112A Series mid displacement, approx. 144 cm³/rev, 809 N·m torque capacity, for conveyor systems
112A-129-AT-0-S: 112A Series large displacement, 211 cm³/rev, SAE-A 2-bolt mount, 82.5 mm pilot diameter, weight approx. 4.5 kg
112A-164AH0: 112A Series large displacement, 269 cm³/rev, SAE-A 2-bolt mount, 82.5 mm pilot diameter, weight approx. 4.8 kg
Key Technical Advantages
1. Solid One-Piece Shaft Design with High Side Load Capacity
The core engineering innovation of the 112A Series is its revolutionary solid one-piece shaft design. In conventional orbit motors, torque is transmitted from the rotor to the shaft through a spline coupling — under frequent reversals or shock loads, this coupling is prone to stress concentration and fatigue wear. The 112A Series integrates the shaft and rotor into a single solid structure with fully fixed spline contact, eliminating the weak link of the torque coupling entirely and minimizing spline contact stress. The integrated shaft structure enables the motor to withstand dynamic side loads up to 1450 lb (approx. 658 kg), allowing direct drive of sprockets, pulleys, and other mechanisms subject to radial forces.
2. IGR Orbit Commutation with Wear Compensation
The 112A-106-AT-1-E-01 employs Parker Nichols IGR (Internal Gear Rotor) orbit commutation, maintaining precise fit between the distribution mechanism and the rotor-stator set. The motor features pressure-loaded power elements that use system pressure to automatically compensate for wear clearance between the distribution face and rotor end face, maintaining stable volumetric efficiency over extended service life. Compared to conventional non-compensated designs, wear compensation technology significantly extends the motor’s high-efficiency operating period.
3. Low Internal Pressure Drop with High Mechanical Efficiency
The 112A Series features optimized internal porting with lower internal pressure drop than comparable products, translating to higher mechanical efficiency and greater flow capacity. Reduced internal pressure drop minimizes energy loss during oil distribution, converting more input power into effective output torque. This characteristic makes the 112A Series particularly suited for continuous-duty applications with high energy efficiency requirements.
4. Ultra-Compact Structure with High Power Density
The 112A Series is one of the most compact hydraulic motors on the market, delivering up to 7200 lb-in (approx. 813 N·m) of torque in a package only approximately 6.6 inches (168 mm) long. The 112A-106-AT-1-E-01 delivers 380 N·m of continuous torque at 174 cm³/rev displacement, achieving power density that leads its class among medium-displacement orbit motors. The compact axial footprint and standardized SAE-A 2-bolt mounting flange facilitate easy integration into space-constrained drive systems. Additionally, the shaft can be extended through the rear cover to mount a parking brake, auxiliary drive function, or encoder for speed reading or closed-loop control.
Application Areas
Aerial Work Equipment: Scissor lift drives, aerial platform travel systems
Agricultural Machinery: Sprayer drives, salt and sand spreaders, agricultural augers
Material Handling: Conveyor drives, winches, wood chippers
Construction Equipment: Compact loader attachment drives, earthmoving equipment
Municipal Equipment: Street sweeper drives, snow removal auger drives
Industrial Drives: Industrial servo drives, oil and gas pipe torque wrenches, mixing trucks
Expert Maintenance Tips
Installation Guidelines:
The 112A-106-AT-1-E-01 uses an SAE-A 2-bolt mounting flange (82.5 mm pilot diameter). Ensure the pilot and equipment interface surfaces are clean and flat during installation. The output shaft is a Ø25 mm cylindrical keyed shaft; shaft alignment must be within 0.05 mm using a flexible coupling.
Before installation, verify system oil cleanliness meets NAS Class 9 or better. Install a 10μm filter upstream of the motor inlet.
Note port orientation compatibility with hydraulic line connections during installation. SAE O-ring ports require ensuring the O-ring is intact and undamaged.
For encoder or parking brake installation, use the rear cover extended shaft interface. Maintain concentricity between the extension shaft and main shaft during installation.
During initial commissioning, run at no more than 30% of maximum working pressure for at least 30 minutes of no-load break-in to allow the IGR distribution interface to seat properly.
Operational Maintenance:
Normal operating oil temperature should not exceed 80°C. Monitor case temperature regularly; if abnormally high, prioritize checking distribution face wear or system internal leakage.
Use premium anti-wear hydraulic oil with viscosity maintained at 20-43 cSt at operating temperature.
Inspect volumetric efficiency every 2,000 hours or every 12 months. If efficiency drops by more than 10% of rated value, disassemble and inspect the IGR distribution assembly and rotor-stator set.
The solid one-piece shaft bearing and spline are designed for long life. However, under high side load conditions, periodically inspect equipment-end support wear.
