High-performance hydraulic travel motors, planetary gearboxes, and wheel drives engineered for high-torque applications.
The modern hydraulic excavator slewing mechanism demands absolute precision, rapid torque response, and controlled stopping behavior. The PCR Swing Motor (Pilot Control Relief / Piston Cylinder Rotary series, designed primarily to replace industry benchmarks like the KYB PCR series) serves as the heart of these rotational movements.
Integrating a high-pressure axial piston structure with an internal mechanical wet-disc parking brake, relief valves, and makeup valves, the PCR motor provides seamless rotation. When an operator moves the controls, the hydraulic flow enters the pistons, pushing the cylinder block against a swash plate to turn the output shaft. When rotation stops, the integrated anti-rebound or cushion valve handles the massive inertia of the rotating upper carriage, preventing structural shock.
Our PCR swing motors features dual-pressure crossover relief valves that limit dynamic spikes, maintaining high volumetric efficiency and preventing hydraulic fluid backflow during sudden decelerations.
Weitai Hydraulic: Heavy Duty Testing & Dynamic Validation Bench in Action.
A side-by-side comparison of PCR model replacements showing technical parameters optimized by China manufacturers for excavator slewing operations.
| Model Series | Applicable Excavator weight (Tons) | Max Displacement (cc/rev) | Working Pressure Limit (MPa) | Dynamic Output Torque (N.m) | Built-in Control Valves |
|---|---|---|---|---|---|
| PCR-1B series | 0.8 – 2.0 Tons | 18.5 – 22.0 | 21.0 – 25.0 | 650 – 850 | Cushion, Anti-reverse, Parking Brake |
| PCR-2B series | 2.2 – 4.0 Tons | 24.8 – 35.0 | 24.5 – 28.0 | 1100 – 1600 | Dynamic Cushion, Dual Crossover Relief |
| PCR-3B series | 4.5 – 6.5 Tons | 38.2 – 55.4 | 27.5 – 31.5 | 2100 – 3200 | Anti-rebound Valve, Wet Multi-Disc Brake |
| PCR-4B series | 7.0 – 9.0 Tons | 58.0 – 85.0 | 32.0 – 35.0 | 3800 – 5500 | Integrated High-Flow Make-up Valves |
How our engineered PCR swing assemblies perform in demanding micro, mini, and medium-scale excavator operations.
Designed for residential landscaping and tight municipal worksites where tail swing space is minimal. The precise rotational control keeps operators safe around delicate structures, and the responsive wet parking brakes ensure immediate locking on inclines.
Forestry harvesters and log loaders demand high start-stop torque under unbalanced structural loads. The PCR cushion valves handle the severe pressure surges generated when swinging heavy timber, protecting internal gear components from fatigue.
Demolition excavators equipped with shears and hydraulic breakers transmit high vibration through the boom down to the slewing ring. Our PCR swing motors use reinforced casing designs and heavy-duty shaft bearings to withstand these forces.
Weitai Hydraulic is one of China’s leading hydraulic suppliers, recognized as one of the earliest hydraulic enterprises specializing in export business for decades. We are committed to providing excellent hydraulic products and services to both businesses and final users worldwide.
We started as an OEM factory and have gradually developed into a comprehensive company integrating production, trade, and investment. Hydraulic motors are one of our core product segments. In addition to our own manufacturing facilities, we are a major shareholder in a high-quality hydraulic motor manufacturer. Our factories are all ISO certified, and our material suppliers have obtained CE, RoHS, CSA, and UL certificates. We routinely design and customize parts according to physical drawings to meet the diverse technical needs of our global customer base.
Our comprehensive motor line includes but is not limited to travel motors, swing motors, and wheel-motors. Engineered with advanced internal structures, they deliver high volumetric efficiency, high structural strength, and reliable stability. In 2019 alone, our production and delivery of travel motors exceeded 40,000 units. Today, Weitai travel motors are integrated directly into the factory assembly lines of top-tier excavator manufacturers like SANY, XCMG, and SDLG.
Serving as the Shandong Hydraulic Association’s (SDHA) Secretary Company and the primary comprehensive export platform of provincial hydraulic organizations, Weitai represents Chinese hydraulic engineering worldwide. We were elected as the 2018 Annual Outstanding Enterprise at the Shandong Equipment Manufacturing Association Annual Conference, and we consistently build on this legacy.
A inside look at Weitai Hydraulic's manufacturing plants, quality validation departments, and technical engineering offices.
Leading the development of electro-hydraulic slewing solutions, hybrid energy storage, and predictive maintenance systems.
Integrating high-performance pressure and thermal sensors inside the PCR casing allows for real-time monitoring. Excavator telemetry systems can trace hydraulic fluid stability and casing temperatures, preventing field failures through early warnings.
As construction equipment transitions to electric drive systems, our engineering team is developing integrated electro-hydraulic actuator swing assemblies. These setups use electronic pilot inputs rather than manual hydraulic fluid paths to control swashplate angling.
By applying Diamond-Like Carbon (DLC) and advanced polymer treatments to internal piston surfaces, we have cut heat generation by 15%. This extends seal service life and allows machinery to run reliably on eco-friendly biodegradable hydraulic fluids.
Weitai Hydraulic enforces high quality control at every phase of production. Our manufacturing facilities are fully ISO certified, and our key materials suppliers carry internationally recognized certificates, including CE, RoHS, CSA, and UL.
Every dynamic component undergoes full load validation, case pressure tolerance testing, and back-leakage measurement before shipping. This focus on engineering quality ensures our hydraulic parts drop in cleanly and perform reliably under extreme field conditions.
A specialized selection of final drive components, featuring drop-in travel motors designed to replace radial piston systems on popular mini track loaders.
Replacement shaft drive radial piston motor engineered for skid steer operations.
FD-279C high-torque replacement final drive with dual-speed motor setup.
Heavy-duty track motor designed for Bobcat T650 compact track loaders.
Direct-fit radial piston track motor designed for Bobcat T590 tracked vehicles.
Why global equipment brands rely on Weitai Hydraulic for bulk OEM supply and custom hydraulic product lines.
China's hydraulic component sector has grown from simple contract manufacturing to a complete ecosystem of raw material sourcing, precision machining, and validation testing. Weitai Hydraulic leverages this integrated ecosystem to offer consistent quality, fast turnaround times, and flexible customization.
A visual walkthrough of our specialized facilities, focused on precision engineering and strict quality control.
Expert technical answers addressing selection, diagnostic, and maintenance challenges for excavator slewing assemblies.
The most common failure indicators include:
When the operator centers the joystick, the control valve blocks the primary inlet and outlet lines. The excavator's heavy upper carriage continues rotating due to inertia, turning the swing motor into a pump. The anti-rebound valve routes high-pressure return oil back to the intake side, buffering shock loads and smoothing the deceleration cycle.
Yes. Our PCR swing motors are designed to match standard OEM specifications, including shaft dimensions, pilot flanges, port configurations, and casing profiles. We match models replacement-for-replacement, allowing our components to drop directly into existing frames without structural modifications.
The case drain routes internal bypass oil—needed for lubricating moving parts—back to the main hydraulic reservoir. If the case drain line becomes kinked or blocked, internal pressures rise rapidly, causing the shaft seal to fail or causing severe damage to the internal piston assemblies.
As the Secretary Company of the Shandong Hydraulic Association (SDHA), we use strict quality control processes. Every motor undergoes a multi-point inspection including pressure holding, leakage monitoring, and dynamic torque tests on calibrated benches. We trace all components to certified materials, and our factories maintain ISO 9001 certifications.
Yes. Our in-house engineering team designs custom gear ratios, spline shapes, and port layouts from your engineering CAD drawings, helping you meet specialized torque and speed requirements.
Premium replacement undercarriages, high-pressure axial piston pumps, and heavy travel drives for industrial machinery.
No. 36 Miao Ling Road, Laoshan District, Qingdao, China 266061
Weitai Hydraulic Industrial Campus
Monday - Friday: 9:00 AM to 6:00 PM (GMT+8)
Saturday & Sunday: Closed (Online Support Active)
Shandong Hydraulic Association (SDHA) Secretary Office
Outstanding Enterprise of Shandong Equipment Manufacturing
Weitai Hydraulic
