Buy the Right Bosch Rexroth MHD Servo Motor for Your Application

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When sourcing a Bosch Rexroth MHD synchronous servo motor, the type code is one of the most important details to verify. The MHD type code defines the motor family, frame size, frame length, winding, feedback option, shaft style, brake configuration, connector orientation, housing type, and standards designation. Each section of the code affects how the motor fits, performs, and integrates into the machine.

For buyers and technicians, that means a partial match is not enough. Two MHD motors may look similar but differ in torque, encoder style, shaft design, cooling method, or brake configuration. If the replacement does not match the original application requirements, installation issues, control compatibility problems, or premature failure can follow.

Wake Industrial is a premier source for Bosch Rexroth MHD repair and replacement options. If you have an MHD motor that is obsolete, damaged, hard to identify, or no longer performing as it should, our team can help decode the type code and match you with the right solution.

Why the MHD Type Code Matters

The MHD type code is the technical identity of the motor. It does far more than label the unit. It tells you the physical mounting size, the torque class, the electrical winding, the encoder configuration, whether the motor has a holding brake, what style of shaft it uses, and how the connectors are positioned.

That is why buying only by series name is risky. A machine may call for an MHD motor, but the complete part number determines whether that motor will fit and function correctly. If even one section of the type code is wrong, the result can be a mismatch in mounting, feedback, shaft coupling, or thermal performance.

MHD Type Code Breakdown

Product Group: MHD

The first section identifies the motor family. MHD designates the Bosch Rexroth synchronous motor series. This separates the motor from other Rexroth product groups and confirms the basic platform being used.

This portion of the code may seem simple, but it still matters when cross-referencing legacy equipment. A machine built for one motor family should not automatically be assumed compatible with another, even if the motors appear similar.

If you are unsure whether your motor belongs to the MHD family, Wake Industrial can help verify the series before you move forward with repair or replacement.

Motor Frame Size

The frame size defines the motor’s key mechanical dimensions, including flange size and centering diameter. This is one of the most important sections of the type code because it determines whether the motor will physically mount correctly to the machine.

Common MHD frame sizes include 041, 071, 090, 093, 095, 112, 115, and 131. Larger frame sizes generally support larger housing dimensions and higher performance ranges.

A frame size mismatch can create immediate installation problems. The wrong motor may not mount properly, may require rework, or may place unnecessary stress on the shaft and coupling arrangement. If you are replacing an older MHD motor and need help confirming the correct frame, Wake Industrial can assist with identification and replacement matching. Call 1-919-443-0207 to speak with an industry professional regarding receiving a quote for lead time, pricing, and condition.

Motor Frame Length

The frame length appears as a letter and identifies the motor’s length within a given frame size. This section is closely tied to the motor’s continuous torque capability at standstill. In general, longer motors within the same frame size provide higher torque output.

Typical frame length designations include A, B, C, and D, depending on the motor size.

This part of the code matters because two motors with the same frame size may still have very different performance capabilities. If the original motor was selected for a specific axis load, acceleration requirement, or holding demand, the frame length must be checked carefully.

Winding Code

The winding code defines the motor’s electrical winding configuration. This section affects electrical characteristics and helps determine how the motor behaves in relation to voltage, current, speed, and torque.

Even when two motors share the same frame size and frame length, the winding code can make them perform differently. That means the correct winding is critical when replacing an MHD motor in an existing machine.

One example within the series is that certain motor sizes and lengths are available with multiple winding options, such as 024, 035, 048, and 058. That flexibility is useful during original design, but it also means buyers must be careful when ordering replacements.

If your original type code is partially missing or damaged, Wake Industrial can help identify the proper winding and locate an appropriate repair or replacement option.

Motor Encoder

The encoder section identifies the motor feedback system. In the MHD series, available options include digital servo feedback with relative position detection and digital servo feedback with integrated multiturn absolute encoder capability.

This is a major compatibility point. Encoder type affects how the motor communicates position and speed information to the drive and control system. A relative feedback motor and an absolute feedback motor are not always interchangeable without broader system review. For machines that rely on retained position information after power loss, absolute feedback can be especially important. If you are replacing an MHD motor and need to preserve original feedback behavior, Wake Industrial can help verify the encoder section of the type code before you buy.

Output Shaft

The shaft section of the code identifies the motor’s output shaft style. Available MHD shaft options include a plain shaft or a shaft with keyway.

This detail directly affects coupling and mechanical power transmission. A shaft mismatch can stop installation even if the rest of the motor is correct. If the original machine setup uses a keyed connection, replacing it with a plain shaft version may require additional rework or different coupling hardware.

Holding Brake

The holding brake section shows whether the motor includes a brake. Depending on the code, the motor may be supplied without a brake or with a holding brake option.

This part of the type code is especially important in vertical axes, suspended loads, and other applications where the axis must remain clamped when power is removed. A brake-equipped motor may be necessary to maintain safe and stable positioning when the machine is shut down or de-energized. If the original motor had a brake and the replacement does not, the machine may no longer behave as intended. .

Output Direction of Power Connector

The connector orientation field identifies the output direction of the motor’s power and feedback connections.

 Depending on motor size and configuration, these may be fixed in specific positions or designed with turnable connection arrangements.

This section matters more than many buyers realize. Connector direction affects cable routing, machine clearance, installation access, and long-term serviceability. In tight cabinet spaces or compact machine designs, the wrong connector orientation can complicate installation or put strain on cables.

Housing Type

The housing type identifies the cooling style. In the MHD series, housing options include natural convection and liquid cooling configurations. This field is critical because cooling method affects thermal performance and intended operating conditions. A liquid-cooled motor should not be treated as interchangeable with a naturally cooled version unless the full application has been reviewed carefully. Thermal mismatches can reduce reliability, shorten service life, or create performance limitations under load. 

Bosch Rexroth MHD Repair and Replacement Options

Not every MHD motor problem requires a full replacement. In some cases, repair may be the better choice, especially if the motor is hard to source or tied to an exact machine configuration. In other situations, replacement is the faster and more practical path.

A type code review helps determine which route makes the most sense. If the motor has a failed brake, worn bearings, feedback issue, or other serviceable problem, repair may be possible. If the unit has severe damage, missing documentation, or a configuration that is easier to replace than rebuild, sourcing the correct replacement may be the better option.

Wake Industrial is a premier source for repair and replacement options for Bosch Rexroth MHD servo motors. We help customers reduce downtime by identifying the correct motor configuration and supporting both legacy and hard-to-find automation components.

Get Help Identifying Your Bosch Rexroth MHD Motor

If you need help breaking down an MHD type code, Wake Industrial can help. Our team can review your part number, identify the key configuration details, and help you determine whether repair or replacement is the best fit for your application.

Call Wake Industrial, submit a quote request through our website, or email your MHD type code today for help with Bosch Rexroth MHD motor repair and replacement.

(Please be advised that Wake Industrial does not offer troubleshooting assistance through phone or email. For repair, replacement, or refurbishment needs, we invite you to use our quote form or call us at 1-877-968-1360.)