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Hydraulic America
Each trip drive unit is provided with a unique identifying plate indicating its specific features. The plate will include the model, serial, and component numbers required to correctly identify the drive. Remember that there is an identical drive on the opposite side that may have a readable plate if you cannot read the plate on your drive.

Our Partners will always seek to get this information from you, however if your licence plate is missing or damaged, there are other methods for identifying your vehicle. Certain drives feature distinguishing marks or casings. Visit our trip drive manufacturers page to see whether or not you can identify your drive from the images shown.

Improperly connecting the hydraulic drive motor may, in the worst case, ruin the final drive. This page will assist in identifying the hydraulic connections applicable to various machine types.

Read this text with these photographs of single-speed and dual-speed, integrated and "plug-in" final drives for micro excavators and huge equipment. These may aid in locating a comparable hydraulic track drive for your machine.

There might be two, three, four, or even five hydraulic connections to a hydraulic track drive and gearbox:

There are two hydraulic lines that power the motor. These are the flow and return lines that link the A and B ports (see images).
  • A casing leak-off or drain. It is crucial to link this to the appropriate C port — See below.
  • A two-speed line used to adjust the speed of the travel motor through the D port.
  • A brake line. Typically, if present, it is attached to the transmission rather than the trip motor.

A & B Ports (flow and return)

These are the primary inlet/outlet ports on the trip motor and are often the biggest ports.
Where there are four or more ports, they are almost typically situated in the manifold's centre.

C1 & C2 Ports (case drain)

The majority of contemporary final drives include two case drain ports, one on each side of the A/B ports.
By inserting a plug in either C1 or C2, the location of the drain port may be altered.
Always connect the case drain line to the highest port and leave the lowermost port unplugged. Some drives feature a single case drain port situated between the A and B ports.
In smaller drives, the dual speed hose/port and case drain hose/port are the same size; thus, it is crucial to accurately identify the case drain hose.
Attaching a pressurised line to this port may result in both mechanical and hydraulic failure. Incorrect plumbing WILL result in damage to the final drive. Before connecting the hoses, you must be certain which line is which. In case of uncertainty, contact your local FDC Partner.
All typical axial piston hydraulic motors are required to have a regulated leakage from the rotating group (the motor) into the casing. This oil lubricates all moving elements inside the rotating group, and it MUST be allowed to drain back to the hydraulic tank through the swivel joint and return line filter relatively unimpeded.
The case drain oil also lubricates the bearings on both motor shafts. It is crucial that the case drain hose be connected to the highest case drain port (if available) so that the motor case is always lubricated.
If the case drain port is not connected or gets obstructed, the pressure within the motor case will increase, resulting in catastrophic damage to the motor and, in most cases, the gearbox.

D Port (Two Speed)

The two-speed port on a trip motor is often the smallest and may be located in a variety of locations, depending on the type and manufacturer.
On the front of the manifold, centred between the A/B ports, or on the side or back of the manifold.

Brake Port

With the exception of tracked dumpers and other faster-moving tracked equipment, it is rare to see a brake port in an integrated gearbox and travel motor since the brake is often regulated automatically.
When using a separate "plug-in" motor, the brake port is often located on the gearbox. If fitted, the location of the port will be specified in the installation instructions.


Hydraulic America is a representative branch of South Korean hydraulic component manufacture. Our parent company has been supplying hydraulic parts for over four decade to construction machinery brands such as Hyundai, Doosan and Volvo in domestic market as well as other international brands all around the globe. We are proud to offer our decades old experience and high quality products to our North American clients.
72 Benbro Dr, Cheektowaga, NY 14225
55 Oakdale Ave St. Catharines, ON L2P 2L3
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