BMM Series Mini Orbital Hydraulic Motor 8-50 Cc/rev

BMM Orbital Hydraulic Motor, 8-50 cc/rev Mini Low Speed High Torque Series

Product Overview

The BMM orbital hydraulic motor is a small shaft-distribution, low speed high torque motor built in six displacements: BMM-8, BMM-12.5, BMM-20, BMM-32, BMM-40 and BMM-50. Continuous torque runs from 11 Nm (BMM-8) to 46 Nm (BMM-50), and intermittent pressure is rated at 140 bar across the series.

Olive Branch Hydraulics manufactures this mini hydraulic motor in Hebei, China, for agricultural, forestry, machine-tool and construction machinery drives. Search references include motor hidráulico orbital BMM and гидромотор BMM.

The gallery shows independent BMM series reference photographs of the keyed-shaft, rear-port configuration. Photographs do not identify a specific displacement. Confirm the supplied shaft, flange and port layout against the approved order drawing.

Key Features

• Shaft-distribution orbital design: a compact mini motor format for low speed, high torque output in light mobile and stationary equipment.
• Six displacements: 8, 12.5, 20, 32, 40 and 50 cc/rev. Smaller sizes trade torque for speed, up to 1592 rpm continuous on the BMM-8.
• Three flange options: M, U and F mounting.
• Four shaft options: A1 16 mm keyed, A2 15.875 mm (5/8 in) keyed, A3 DIN 5482 B17x14 involute spline, A4 14 mm keyed.
• Bidirectional rotation: viewed facing the shaft, flow in at port A and out at port B gives clockwise rotation. Reversing the flow gives counterclockwise rotation.
• Port options: port type is specified at order and confirmed against your hose or manifold interface.

Technical Specifications for BMM-8 to BMM-50

Selection should start from required torque at continuous pressure, then check speed against available flow. Each figure below is a separate catalogue rating, so no single motor reaches every maximum at the same time.

Operating Limits

• Do not run at the highest speed and maximum pressure together.
• Intermittent ratings apply for no more than 10% of each minute (6 seconds per minute).
• Recommended maximum system temperature: 82°C.
• BMM-40 and BMM-50 have lower continuous pressure ratings, 90 bar and 70 bar.
• Shaft seal pressure limits vary with speed and case drain arrangement. We confirm them against your circuit.

Ordering and Fitment Checklist

1. Displacement: BMM-8, 12.5, 20, 32, 40 or 50.
2. Flange: M, U or F.
3. Shaft: A1, A2, A3 or A4.
4. Port option.
5. Rotation, plus any reverse configuration.
6. Other options, system pressure, flow, case drain layout and the mating interface drawing.

Customer Search Names, Model Aliases and Part-Number Enquiries

The BMM mini orbital hydraulic motor is also described as a mini gerotor motor, spool-valve hydraulic motor or small LSHT motor. When requesting a quote, include the complete nameplate code rather than only the family name.

OMM Original-Motor References for Replacement Assessment

If your existing motor is identified as Danfoss or Sauer-Danfoss OMM, send its complete part number, nameplate photo and mounting drawing. The following original-manufacturer references have been checked by model identity. They are enquiry references, not approved interchangeability claims or Olive Branch stock codes.

Each original part number can specify a different shaft, flange, port location, thread, seal or drain configuration. Matching nominal displacement alone does not establish a replacement. We check these interfaces, duty point, pressure, speed and torque before confirming the independently manufactured Olive Branch motor. No OMM code is assigned here to BMM-40 without a verified reference.

International enquiries may use motor hidráulico orbital BMM (Spanish), moteur hydraulique orbital BMM (French), BMM Orbitmotor (German) or гидромотор BMM (Russian). Quote the same complete model and part number in any language.

Why Choose Us

Olive Branch Hydraulics manufactures hydraulic motors, hydraulic gear pumps and related components in Hebei, China. Supply is EXW, and each order is quoted by configuration and quantity.

• Distributors and wholesale buyers: mixed BMM displacements and shaft codes can be quoted on one order, with pricing set per configuration and volume.
• OEM/ODM customers: motors are built to your sample or drawing, and the interface is verified before production.
• Private label buyers: packaging and marking requirements are quoted per configuration.
• Trial orders and start-ups: MOQ and sample terms are set per model and option set.
• Project buyers and end users: suitability is confirmed through a system and interface check, not assumed from the model name.

The gallery includes the catalogue A1-A4 shaft-option technical drawing. Request the configuration-specific mounting drawing and series catalogue before ordering.

FAQ

Can a BMM-50 run at 455 rpm and 140 bar at the same time?

No. The catalogue rules out combining highest speed with maximum pressure, and 140 bar is an intermittent rating only.

How long can intermittent ratings be applied?

No more than 10% of each minute, which is 6 seconds per minute.

Which shaft matches a DIN 5482 spline coupling?

The A3 shaft, DIN 5482 B17x14 involute spline. A2 is the 5/8 in keyed option.

How do I identify the correct BMM ordering code?

Specify the BMM displacement, flange, shaft, ports, rotation and options. Confirm the complete code against your drawing or old motor; no equipment OEM part numbers are provided in this catalogue.

What shaft seal pressure can the motor take?

It depends on speed and case drain arrangement. Send your circuit data so we can confirm the limit for your application.

How are MOQ, samples, packaging and delivery handled?

All four are quoted per configuration. Pricing is EXW Hebei, China.

Call To Action

Send the BMM displacement, flange, shaft, port, rotation, quantity and destination market. We will reply with an EXW quotation, sample terms and lead time for that configuration.