MKE12-2-D21-A08-1141-0000 Poclain Hydraulic Motor

Product Overview

The MKE12-2-D21-A08-1141-0000 is a Poclain MK / MKE compact-series radial piston hydraulic motor in the size-12 frame, built as a low-speed high-torque (LSHT) wheel motor. It is machined to the interface dimensions, mounting datum, and cam profile of the original Poclain MKE12 motor, so it works as an interchangeable replacement for the original MKE12 unit and drops into the existing wheel hub or tool drive without modifying brackets or lines.

The motor uses a radial-piston cam-lobe design with a large central hollow shaft and four-contact roller bearings. The result is a short, torque-dense package suited to space-constrained wheel and tool drives on compactors, mini and midi excavators, drills, agricultural machines, and municipal vehicles. Our positioning is high-pressure hydraulic R&D and manufacturing with emphasis on original-position interchangeability and 100% simulated operating-condition testing before shipment, lowering the risk of field failures and downtime.

The MKE12 series spans MK, MKD, and MKE frames and cam profiles (equal- and unequal-lobe cams). We also supply interchangeable replacements across frame sizes 04, 12, 18, and 23 in the same family, covering everything from compact wheel drives to mid- to high-power hub drives.

Technical Specifications

• Model: MKE12-2-D21-A08-1141-0000

• Series: Poclain MK / MKE compact radial piston motor, size 12 frame

• Product type: Low-speed high-torque (LSHT) radial piston hydraulic motor/wheel motor/shaft motor

• Variant flag: “2” indicates a 2-displacement (double-displacement) version, per the Poclain MK12-MKE12 official model-code structure (1- or 2-displacement motor)

• Displacement range (MKE12 series, verified): 627 to 1356 cm³/rev (max 82.7 cu.in/rev)

• Exact displacement for the D21 code: Not confirmed in official documentation (cross-check D21 against the Poclain official ordering-code manual)

• Pressure (MKE12 series, verified): 450 bar peak (6527 PSI)

• Max torque (MKE12 series, verified): 9710 N·m (7162 lb-ft)

• Theoretical torque at 100 bar (verified): 2156 N·m (1096 lb-ft)

• Max speed (MKE12 series, verified): 100 RPM (higher speeds on request to Poclain application engineer)

• Max power (MKE12 series, verified): 41 kW (55 HP)

• Control/displacement: Single-displacement (1C) or 2-displacement (2C) option

• Rotation: Not confirmed in official documentation (set by ordering code and assembly configuration)

• Weight: Not confirmed in official documentation (compact MK family is under 30 kg overall; MKE12 not individually listed)

• Mounting: Large central hollow shaft, four-contact roller bearings, short compact body; wheel or shaft motor mounting

• Shaft: Hollow shaft option (verified standard for MKE12)

• Ports: A08 is the port/connection code; exact size and form not confirmed in official documentation

• Brake: 1141 is the brake/sensor configuration code; exact brake and sensor combination not confirmed in official documentation. MKE12 series offers parking/emergency brake and Twin-Lock™ anti-skid options (verified)

• Options (verified): Twin-Lock™ integrated anti-skid, parking brake

• Fluid requirements: Not confirmed in official documentation (verify cleanliness and viscosity with the Poclain official datasheet before ordering and commissioning)

Key Technical Advantages

• Original-position interchangeability: Machined to the Poclain MKE12 mounting datum, ports, and cam profile, so it replaces the original motor directly and removes the need for line or bracket rework, shortening downtime.

• 100% simulated operating-condition testing: Every motor is tested on a bench at high-pressure operating conditions for flow, pressure, leakage, and low-speed smoothness before shipment, reducing early field failures.

• High torque density in a short body: The radial-piston cam-lobe design with a large hollow shaft and four-contact roller bearings delivers high torque in confined spaces, ideal for compactor drums, wheel hubs, and tool drives.

• Low-speed smoothness with 2-displacement choice: The 2-displacement structure (the “2” in the model) shifts between high and low displacement, balancing low-speed high-torque traction with higher-speed return travel across compaction, traction, and swing duties.

• Cleanliness control and sealing reliability: Critical friction pairs are machined to tight tolerances and assembled under controlled cleanliness, suppressing Particle-induced wear and extending overhaul intervals.

Application Areas

• Construction equipment: Compactor drum drives, mini and midi excavator swing and traction aids, concrete equipment, drilling rigs

• Mining equipment: Underground transporters, tunneling and drilling auxiliaries, high-pressure abrasive environments

• Agricultural machinery: Harvesters, sprayers, tillers, wheel or tool drives

• Municipal and sanitation vehicles: Refuse trucks, street sweepers, service-vehicle attachments and traction

• Industrial tool drives: Automated or manual tool systems needing low-speed high torque in a compact envelope

Expert Maintenance Tips

• Prioritize fluid cleanliness: Radial piston motors are contamination-sensitive. Control oil cleanliness to the system pressure class and sample regularly to avoid early wear of the distributor and piston pairs.

• Verify the ordering code before fitting: In MKE12-2-D21-A08-1141-0000, D21, A08, and 1141 map to displacement, ports, and brake/sensor configuration. Cross-check each segment against the original nameplate and the Poclain official ordering-code manual for displacement, rotation, ports, and brake interface before replacement.

• Bleed before start-up: After first fit or long storage, purge air from the case and high-pressure cavities to avoid cavitation and momentary dry running; run unloaded at low speed for a few minutes before loading.

• Case drain and back pressure: If a case-drain port is present, route it to tank and keep back pressure within the stated limit to prevent shaft-seal failure from excess back pressure.

• Brake and sensor interfaces: For braked / sensed versions, confirm release pressure, electrical interface, and sensor supply before commissioning to avoid a locked brake or faulty signal.

• Torque and alignment checks: On wheel fitment, tighten to the specified torque and check hollow-shaft-to-hub alignment to avoid side loads that accelerate bearing and seal wear.