111A 112A Hydraulic Orbit Gear Motor 111A-129-AT-0 112A-088-AT-0-F 112A-106-AT-O-F 112A-088-AM-O-F

112A: Series number, representing the quantitative hydraulic motors of the “AA/AF/AB/AC” series.

106: Displacement code. This indicates that the displacement of the motor is 106 cubic inches per revolution. This is a very large displacement and belongs to a low-speed high-torque motor.

AT: Shaft type code. This indicates that the motor is equipped with a “Tapered Shaft”, which is typically used for installing sprockets or gears.

O: Oil port position code. It represents that the oil Ports are located at “Opposite Ports”, that is, one is on one side of the shell and the other is on the end cover.

F: Rotation direction code. This indicates that it is a motor with a “Fixed” rotation direction. Whether it is clockwise or counterclockwise specifically needs to be confirmed by referring to the detailed drawings.

1. Alternative model
Finding “substitutes” for hydraulic motors requires extreme caution and it is essential to ensure that all key parameters match. The alternative solutions are mainly divided into two categories

A. Alternative or equivalent models:

The exact same model: 112A-106-AT-O-F (if this model is still in production or in stock on the market, this is the best choice).

2. Motor type and product attributes
Type: Radial plunger type, quantitative hydraulic motor.

Working principle: By utilizing the radial movement of the plunger within the rotor and driven by the pressure of the hydraulic oil, hydraulic energy is converted into mechanical energy (rotational motion and torque).

Product attributes:

Displacement: 106 cu in/rev (cubic inches per revolution), approximately 1737 cc/rev (milliliters per revolution).

Shaft type: Conical shaft with keyway.

Installation method: Typical flange installation.

Oil port type: Usually SAE straight thread oil port.

Rotation direction: Fixed (This model rotates in one direction only).

Shell: cast iron or steel.

Pressure rating: It belongs to medium and high-pressure motors. For specific continuous operation and peak pressure, please refer to the technical manual (generally, the continuous operation pressure is within the range of 250-300 bar, and the peak pressure is even higher).

3. Characteristics
Low speed and high torque: This is its most core feature. A displacement of 106 cubic inches means that a huge torque can be output at a relatively low rotational speed.

High starting torque: The radial plunger design endows it with excellent starting characteristics and high starting efficiency.

Sturdy and durable structure: Designed for heavy-duty and harsh industrial environments.

High efficiency: Under the designed working conditions, it features high volumetric efficiency and mechanical efficiency.

Direct drive: Due to its large torque, it can usually directly drive the load without the need for an additional reducer, simplifying the transmission structure.

4. Function and Role
Convert the hydraulic energy (flowing high-pressure oil) in the hydraulic system into the low-speed and high-torque rotational mechanical energy required to drive the equipment. It acts as the “actuator” of the entire hydraulic transmission system.

5. Usage scenarios
This large-displacement motor is specifically designed for low-speed applications that require significant driving force and is commonly found in:

Construction machinery

The walking drive of the excavator

The traveling drive of the crawler crane

The rotary platform drive of the drilling rig

Mining machinery

The wheel drive of the underground scraper

The cutting head or walking drive of the continuous coal mining machine

Ships and Port machinery

Deck machinery, such as winches and anchor machines

The walking drive of the port rubber-tired crane

Forestry machinery

The drum drive of the logging and stacking machine

Agricultural machinery

The walking drive of large combine harvesters

6.112A Series Model Introduction
The 112A series is a classic family of radial ball piston hydraulic motors. The feature of this series is to distinguish different shaft types, oil port positions and rotation directions through suffixes such as “AA/AF/AB/AC”.

The general naming rule for this series of models is usually:
112A – [Displacement Code] – [Shaft Type Code] – [Oil Port Code] – [Rotation Direction Code]

Displacement codes: from smaller sizes (such as 20, 30) to very large sizes (such as 106, 130+), to meet different torque requirements.

Shaft type code

AA: Straight shaft, with key

AF: Splined shaft

AT: Conical shaft (as in this example)

AB/AC: With brake or other accessories

Port codes: such as O (opposite side), S (same side), etc.

Rotation direction codes: such as F (fixed), R (reversible), etc.

Summary

The 112A-106-AT-O-F is a large-displacement, low-speed, high-torque, unidirectional rotating radial piston hydraulic motor, mainly used in heavy machinery equipment where a huge driving force needs to be directly provided. When choosing alternatives, it is essential to conduct a detailed comparison of parameters, especially in terms of displacement, installation dimensions, shaft type and pressure rating.