Bosch Rexroth hydraulic motors for Hamm road roller 01284274 1297481 1271830 1271849 2042187 2279834 1298445

Hamm road rollers utilize closed-loop hydrostatic travel and vibration systems. Bosch Rexroth supplies the muscular, highly precise hydraulic motors that convert fluid power back into mechanical force.

Whether it is a single-drum soil compactor (like the Hamm HC series) or an articulated tandem asphalt roller (like the Hamm HD+ series), Rexroth motors deliver the essential low-speed, high-torque capabilities required to move heavy tonnage over uneven surfaces without slipping.

Primary Types of Rexroth Motors Found in Hamm Rollers

Depending on the specific application—whether driving the wheels/drum for propulsion or spinning the internal eccentric weights for vibration—different motor architectures are used.

Propulsion and Travel Drives: Axial Piston Motors

For driving the rear wheels or the heavy front drums, Hamm primarily implements Bosch Rexroth axial piston motors.

A6VM Series (Variable Displacement): Commonly used in Hamm's travel drives, the A6VM series allows the machine to switch dynamically between high torque at low speeds (working mode) and lower torque at high speeds (travel/transport mode).

A10FM Series (Fixed Displacement): Known for its extreme robustness and high-pressure capabilities, this series is often utilized in fixed-speed drive lines or high-performance vibration circuits.

Maintenance and Troubleshooting Best Practices

To avoid costly downtime on the job site, maintaining the health of your Bosch Rexroth hydraulic motor is critical. Hydrostatic systems operating under high pressure (350-420bar) have very low tolerance for contamination.

Keep the Hydraulic Fluid Pristine

The majority of hydraulic motor failures are caused by particle contamination or fluid degradation.

Always stick strictly to Hamm's recommended filter replacement intervals, and only use OEM-quality hydraulic oil with the correct viscosity index for your operating climate.

Monitor Case Drain Pressure

Excessive wear inside an axial piston motor leads to high internal leakage, which exits through the case drain line. If you notice a sudden drop in travel speed or a loss of climbing power, check the case drain flow. High flow indicates that the internal rotating group (pistons and valve plate) may be worn and require a rebuild.

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Q1:What causes a hydraulic motor on a road roller to overheat?

A1:Overheating is typically caused by high internal leakage (wear), aerated or low hydraulic fluid, a clogged hydraulic oil cooler, or running the roller at pressures continually exceeding its relief valve limits.

Q2:Where can I find the exact part number for my Rexroth motor?

A2: Every Rexroth motor has a metal data plate stamped with its model code (e.g., A6VM80DA1/60W-PZB086B-S) and a unique 7- or 10-digit material number (R-number). Hamm also assigns its own proprietary spare part number (e.g., 2265669). Cross-referencing both ensures you receive the exact drop-in replacement.

Q3:What is the price and delivery time of the Rexroth motor for the Hamm road roller？

A3: The specific price and delivery time will depend on the equipment model or specific product model you provide.

Q4:How to purchase a Hamm road roller hydraulic motor?

A4:You can visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products through various methods.