CAT 305.5E2 / 306E2 Swing Motor Assembly – Specification (452-6209 / PCR-4B-20A)

Description

Detail Information

Note: The application information provided is for reference only. Please confirm the part number and compare it with the old component before purchasing. If you have any questions, please feel free to contact us.
It is worth choosing a product that features stable performance, high reliability, easy installation, and quick response.

1. Key Features & Benefits

• Genuine OEM-spec swing motor assembly – OEM part number 452-6209 (also referenced as PCR-4B-20A). Engineered to Caterpillar’s original equipment specifications for the CAT 305.5E2, 306E2, and compatible 5–6 ton class mini excavators. This is a brand‑new, factory‑spec unit – not remanufactured, not a generic substitute.

• Core component of the excavator’s slewing system – The swing motor is the heart of the upper structure rotation system, responsible for driving the rotational movement of the cab, boom, arm, and bucket. It converts hydraulic power into controlled rotational motion, enabling the excavator to swing horizontally for efficient digging and material placement. When this motor fails, the machine cannot position itself for productive work.

• Direct replacement for CAT 305.5E2 and 306E2 – Specifically designed for Caterpillar 305.5E2, 306E2, and compatible models including 305E, 305E2 CR, 305.5D, and 306. Mounting flange, shaft interface, and hydraulic port configurations match the original Caterpillar specifications exactly – no modifications, no adapters.

• PCR-4B-20A platform – NACHI’s proven mini excavator swing technology – The PCR-4B-20A is part of NACHI’s renowned PCR series of axial piston swing motors. PCR series motors integrate an axial piston hydraulic motor with a planetary gearbox and braking mechanism in a compact assembly, providing smooth, reliable rotation for 5–6 ton class machines.

• High torque output for 5–6 ton class work – Delivers the torque and rotational power needed for precise slewing operations even under full bucket loads. The swing motor works in tandem with the swing drive gearbox to rotate the upper structure smoothly. The assembly weighs approximately 60 kg (132 lb) with dimensions of 45 × 35 × 35 cm.

• Integrated parking brake for slope safety – The swing motor features a built‑in spring-applied, hydraulically-released disc parking brake. When the hydraulic control console is raised or the engine is stopped, the brake engages automatically, holding the upper structure securely on slopes. When a swing operation is started, the brake releases instantly for immediate response.

• Relief and makeup valves for circuit protection – Integrated relief valves protect the swing motor against pressure spikes during sudden stops or overloads. Makeup (anti‑cavitation) valves prevent vacuum damage during rapid deceleration. Together, these valves ensure smooth, jerk‑free slewing and extend motor life.

• Robust construction for demanding conditions – Key components are crafted from high-quality materials with specialized treatments for excellent wear and corrosion resistance. The rational structural design simplifies maintenance and extends service life. Operates reliably in harsh conditions including dust, moisture, and temperature extremes.

• Pre-shipment visual verification – Before packing, we send you detailed high‑resolution photographs of the actual unit (mounting flange, splines, port threads, castings, overall condition). You approve shipment – we never ship blind.

• Fast delivery – 5–8 working days lead time from our Guangzhou warehouse. Monthly supply capacity of 300 units, available for single‑piece or bulk orders.

2. Applications

The genuine CAT 452-6209 swing motor assembly is the power source for the slewing system on CAT 305.5E2 and 306E2 mini excavators used across a wide range of job sites:

• Urban construction & utilities – Road building, sidewalk repairs, house demolition, water and gas line trenching, and fibre‑optic cable installation. The swing motor’s precise rotational control and smooth start‑stop characteristics are essential for working near existing structures without overswinging or causing damage.

• Residential & commercial development – Foundation digging, basement excavation, retaining walls, grading, and site preparation. The smooth rotation and instant response enable operators to place materials accurately and work efficiently in confined residential spaces.

• Rural development & agriculture – Agricultural irrigation, land leveling, rural road construction, drainage ditch cleaning, and pond maintenance. The swing motor’s robust construction and sealed design withstand dirt, moisture, and debris common in agricultural environments.

• Landscaping & pool excavation – Pool digs, retaining walls, grading, and drainage work. The smooth, jerk‑free slewing provided by the relief and makeup valves minimises disturbance to nearby homes, while the integrated parking brake holds the upper structure securely on slopes.

• Equipment rental fleet – Mini excavators are the most frequently rented machines. A genuine new swing motor provides predictable service life and eliminates the gamble of remanufactured or used units – avoiding costly mid‑rental failures, towing bills, and customer complaints. The swing motor is a high‑wear component on rental machines due to constant rotation and varying operator habits.

• Forestry & vegetation clearance – Steep slopes, fallen timber, and uneven terrain demand reliable swing performance. The swing motor’s robust construction and sealed bearings withstand the dirt, moisture, and debris common in forestry applications.

3. Product Quality – Hongtengda Parts

When you purchase a CAT 452-6209 swing motor from Hongtengda Parts, you are not just buying a component – you are investing in reliability backed by over 25 years of industry experience.

Genuine OEM specification, not a compromise – Every swing motor we supply is manufactured to Caterpillar’s original equipment specifications, using the same engineering standards and quality control processes as the unit that left the factory on your 305.5E2 or 306E2. We do not sell “compatible” substitutes or generic replacements – you receive a motor that matches the original in every measurable dimension.

Rigorous pre‑shipment inspection – Each swing motor undergoes a thorough visual inspection and functional verification before it is released for shipment. We check:

• Mounting flange flatness and bolt hole alignment

• Hydraulic port thread integrity and seal surfaces

• Shaft spline condition and dimensional accuracy

• Overall casting integrity and paint finish

High-quality materials and manufacturing – Key components are crafted from high-quality materials with specialized treatments for excellent wear and corrosion resistance. The rational structural design simplifies maintenance and extends service life. Advanced manufacturing processes ensure stable, high-performance operation even under harsh conditions.

Traceable quality control – Every swing motor is documented with production batch records, allowing us to trace any quality issues back to their source. This commitment to traceability ensures consistent quality across all units.

Factory-sealed and ready to install – Each swing motor is sealed and protected at the factory, ensuring it arrives in the same condition as when it left production. Ports are capped to prevent contamination ingress during storage and shipping.

Pre‑shipment visual verification – Before packing, we send you clear, high‑resolution photographs of the actual unit – mounting flange, splines, port threads, casting marks, and overall condition. You approve shipment only after reviewing these images. We never ship blind.

25 years of heavy equipment parts experience – Since 2001, we have been the go‑to supplier for repair shops, fleet owners, and wholesalers worldwide. We know the CAT 305.5E2 and 306E2 platforms inside out – the different hydraulic systems, control configurations, and production changes over the years.

One supplier, all parts – Got a serial number, a model code, or just a photo of a worn‑out part? Our specialists cross‑reference across Caterpillar, Komatsu, Hitachi, and 15+ brands to find what you need. OEM, OEM‑quality, or hard‑to‑find older model parts – we handle the search so you don’t have to.

After‑sales support that works – Three senior technicians review your case together. If it’s a quality issue – we cover it. If not – we still guide you through the fix. We don’t just sell parts; we keep you running.