The 803094764 Bucket Swing Cylinder (also known as circle rotation cylinder or blade swing cylinder) is a genuine OEM hydraulic component manufactured by XCMG for motor graders and heavy construction equipment. This precision‑engineered cylinder controls the rotational movement of the blade circle, allowing the operator to swing the moldboard left or right for ditching, shoulder work, and angle grading. Constructed from high‑strength alloy steel with a precision‑honed internal bore and premium polyurethane seals, the 803094764 cylinder is engineered to withstand extreme operating pressures up to 18 MPa (2,610 psi) in the load‑sensing hydraulic systems of XCMG GR series motor graders.
The bucket swing function is critical for positioning the blade at the desired angle relative to the machine centerline. The 803094764 cylinder directly replaces worn, leaking, or damaged circle rotation cylinders on XCMG GR135, GR165, GR180, GR215, GR260, GR300, and GR350 motor graders. Each unit includes the cylinder barrel, piston rod, seals, and mounting brackets for a complete drop‑in replacement.
XCMG motor graders are known for their superior blade maneuverability and grading accuracy. The 803094764 bucket swing cylinder plays a vital role in this system by providing precise, responsive circle rotation. Proper maintenance and timely replacement of this cylinder are essential for the longevity and performance of your motor grader.
| Parameter | Specification |
|---|---|
| OEM Number | 803094764 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Bucket Swing Cylinder / Circle Rotation Cylinder |
| Bore Diameter | 70 mm (typical for GR series) |
| Stroke Length | 350 mm (varies by model) |
| Piston Rod Diameter | 35 mm (chromed, corrosion-resistant) |
| Maximum Operating Pressure | 18 MPa (180 bar / 2,610 psi) |
| Proof Pressure | 24 MPa (240 bar / 3,480 psi) |
| Burst Pressure | ≥ 48 MPa (480 bar / 6,960 psi) |
| Seal Material | Polyurethane (U-cup) / Nitrile rubber (NBR) wiper |
| Housing Material | High-strength alloy steel, induction hardened |
| Mounting Type | Clevis / Trunnion (direct OEM replacement) |
| Hydraulic Fluid | ISO VG 46 / VG 68 mineral oil-based |
| Temperature Range | -20°C to +80°C (-4°F to +176°F) |
| Port Threads | BSPP (G‑thread) / SAE O‑ring ports (varies by model) |
| Corrosion Protection | 500+ hours salt spray (ASTM B117) without red rust |
| Weight | Approximately 18 – 25 kg (depending on size) |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350 motor graders |
| Certifications | ISO 9001:2015, ISO 14001, CE, RoHS |
The XCMG 803094764 Bucket Swing Cylinder is a core component of the grader’s circle rotation system. Unlike simple blade angle adjustment, the bucket swing cylinder rotates the entire blade circle (typically 360° continuous rotation), allowing the operator to position the blade at any angle relative to the machine centerline. This is essential for ditching, slope work, shoulder grading, and snow plowing applications.
The cylinder receives pressurized hydraulic oil from the load‑sensing control valve and extends or retracts to rotate the circle via a worm gear or rack‑and‑pinion mechanism. The 803094764 cylinder is designed to provide smooth, jerk‑free rotation even under heavy blade loads. The built‑in cushioning feature decelerates the piston at the end of the stroke, reducing shock loads on the circle drive and improving operator comfort.
XCMG GR series graders feature a hydraulically driven circle rotation system with a dual‑cylinder arrangement (left and right) for balanced force distribution. The 803094764 cylinder is the left‑side or right‑side cylinder depending on the application, but the part number is used interchangeably for the specific size. The cylinder’s displacement and rod ratio are optimized to provide the correct balance of speed and torque for the circle rotation function.
Properly functioning bucket swing cylinders are critical for maintaining blade control. If a cylinder fails or leaks, the circle may drift, rotate erratically, or refuse to move altogether, severely limiting the grader’s versatility. Replacing a worn cylinder with a genuine XCMG 803094764 restores full circle rotation capability.
The 803094764 cylinder is built to withstand the extreme shock loads, vibration, and harsh conditions of motor grader operation. The cylinder barrel is manufactured from high‑strength cold‑drawn seamless steel tube, which is then induction hardened to resist scoring and wear from the piston and seals. The internal bore is precision‑honed to a mirror finish (Ra ≤ 0.2 µm), providing a smooth, low‑friction surface that extends seal life and ensures consistent performance.
The piston rod is made from high‑tensile alloy steel and coated with a hard chrome layer. This coating provides exceptional wear resistance and corrosion protection, enabling the rod to withstand exposure to road salt, dust, and moisture without pitting or rusting. The rod end and cylinder base feature heavy‑duty clevis or trunnion mounts, which are case‑hardened to resist deformation under high side loads.
The sealing system uses premium polyurethane U‑cup rod seals and nitrile rubber (NBR) wipers. The polyurethane material offers high resistance to extrusion and wear, maintaining a positive seal even under high‑pressure spikes. The wiper ring prevents dust and debris from entering the cylinder, protecting the rod and seals from abrasion. The cylinder also incorporates a built‑in cushioning feature at the end of the stroke, which decelerates the piston before it contacts the end cap, reducing shock loads on the circle drive and improving operator comfort.
All external surfaces are coated with XCMG’s proprietary paint system, providing over 500 hours of salt spray resistance per ASTM B117. This corrosion protection is essential for graders operating in coastal environments, winter road maintenance, or high‑humidity conditions. The paint system also resists chipping and fading, maintaining a professional appearance even after years of service.
Replacing the bucket swing cylinder is a task that should be performed by a qualified technician. Begin by parking the grader on level ground, lowering the blade to the ground, and shutting off the engine. Relieve hydraulic pressure by cycling the circle rotation control lever with the engine off. Chock the wheels and support the blade circle to prevent it from rotating unexpectedly once the cylinder is disconnected.
Disconnect the hydraulic hoses from the cylinder ports, capping them immediately to prevent contamination. Remove the retaining pins or bolts from the rod end and base end mounts. Carefully extract the old cylinder, noting the orientation of the ports and the position of any shims or spacers. Clean the mounting brackets and inspect the pins for wear. If the pins are worn or corroded, replace them with new XCMG genuine pins.
Install the new 803094764 cylinder in the reverse order. Apply a thin film of clean hydraulic oil to the seals and O‑rings before installation. Torque the mounting pins to the specification in the service manual (typically 150‑200 Nm for the main pivot pin). Torque the hydraulic hose fittings to the correct value (35‑45 Nm for M14 ports).
After installation, start the engine and cycle the circle rotation from full left to full right several times to purge air from the system. Check for leaks at all connections and verify that the circle rotates smoothly and locks firmly when the control is centered. Test the grader under normal operating conditions to ensure proper circle rotation response.
Aftermarket circle rotation cylinders often use lower‑grade steel for the barrel and rod, leading to premature wear, scoring, and seal failure. The genuine XCMG 803094764 is manufactured from high‑strength alloy steel and features a hard‑chromed, ground piston rod that meets original equipment specifications. Aftermarket cylinders may also have incorrect port thread sizes or mounting dimensions, leading to installation difficulties or leaks.
Counterfeit cylinders often omit critical internal features such as cushioning or anti‑cavitation valves, resulting in harsh stops and potential damage to the circle drive mechanism. The 803094764 includes all factory‑specified internal elements, ensuring that your grader maintains its original circle rotation feel and safety characteristics. Additionally, genuine XCMG cylinders are batch‑tested for pressure integrity and seal performance, whereas counterfeit products rarely undergo any quality control.
XCMG provides a 12‑month warranty against manufacturing defects. Each cylinder is serialized for traceability. Using genuine XCMG bucket swing cylinders ensures compatibility, reliability, and the protection of your valuable equipment. Investing in OEM parts helps maintain the machine’s resale value and guarantees that the circle rotation system will perform as designed by XCMG engineers.
Common symptoms of a failing bucket swing cylinder include: visible oil leakage from the rod seal or hose connections, the circle failing to hold its position (drift), sluggish or jerky rotation, unusual noises (grinding or knocking) during circle rotation, and external damage to the piston rod such as scoring, pitting, or bending. Also, if the circle rotation control feels “spongy” or requires excessive input to move the blade, the cylinder may have internal leakage.
Preventive replacement is recommended every 5,000 to 7,000 operating hours, or whenever the cylinder shows signs of wear. The cost of a genuine cylinder is minimal compared to the cost of a failed circle drive mechanism, damaged worm gear, or extended downtime. When replacing a cylinder, always replace both the left and right circle rotation cylinders as a set to ensure balanced rotation performance. Using one new cylinder with an old one can result in uneven rotation and unpredictable blade positioning.
During routine maintenance, inspect the cylinder rods for scoring or pitting. Check the rod end and base end pins for wear and lubrication. Listen for any unusual noises during circle rotation. Keep a stock of 803094764 cylinders in your parts inventory for rapid field replacement, especially if your fleet operates in remote areas where downtime is particularly costly. A well‑maintained circle rotation system improves grading efficiency and reduces operator fatigue.
The 803094764 Bucket Swing Cylinder is stocked in XCMG regional warehouses in North America (Houston), Europe (Rotterdam), Middle East (Dubai), and Asia (Shanghai). Standard air freight delivers within 3‑7 business days worldwide. Expedited shipping (1‑2 days) is available for urgent breakdowns. Bulk orders (5+ cylinders) receive volume discounts and can be shipped via sea freight.
Each cylinder is individually packed in a foam‑lined wooden crate to prevent damage during transit. For large fleets, consignment stock programs are available to ensure immediate availability and reduced downtime. Don’t let a worn or leaking bucket swing cylinder compromise your grader’s blade versatility or safety.
Order the genuine XCMG 803094764 Bucket Swing Cylinder today and restore precise, responsive circle rotation to your motor grader. The 803094764 cylinder is a critical safety and performance component in your motor grader’s blade control system. A failed cylinder can prevent the blade from rotating, severely limiting the machine’s ability to perform ditching, slope work, or shoulder grading. Keep spare cylinders in your service truck for rapid field replacement, and always replace with genuine XCMG components.
Upgrade your motor grader’s blade control reliability with the XCMG genuine bucket swing cylinder. Engineered for strength, precision, and safety – order now and experience the quality that keeps your grader productive and versatile.
