The 380905028 Seal is a genuine OEM hydraulic rod seal and dust wiper manufactured by XCMG for motor grader hydraulic cylinders, pivot joint housings, and gearbox covers. This precision‑molded sealing component is designed to prevent oil leakage, exclude contaminants (dirt, water, dust), and maintain system pressure on GR series motor graders (GR135, GR165, GR180, GR2003, GR215, GR300, GR350). Constructed from high‑grade polyurethane (PU) or nitrile rubber (NBR) with a metal reinforcement ring, the 380905028 seal withstands extreme pressure cycles, temperature fluctuations, and abrasive environments typical of road grading, mining, and land reclamation.
The seal features a double‑lip design: an inner primary lip that seals hydraulic oil under pressure and an outer secondary lip that acts as a dust scraper. A garter spring (optional on some variants) maintains constant lip contact with the rod even after wear. The outer diameter is press‑fitted into the housing groove, providing a static seal against the bore. The 380905028 seal is critical for blade lift cylinders, steering cylinders, circle drive actuators, and articulation pivot pins. A leaking or cracked seal causes oil loss, reduced machine performance, and contamination ingress that accelerates cylinder bore wear.
Replacing a worn or damaged seal with the genuine XCMG 380905028 restores factory‑specified sealing performance, eliminates oil leaks, and protects internal components. Aftermarket seals often use inferior elastomers that harden or swell in hydraulic oil, leading to premature failure. Always choose original XCMG for exact dimensions, correct material durometer, and long‑term reliability.
| Parameter | Specification |
|---|---|
| OEM Number | 380905028 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Hydraulic rod seal / dust wiper / U‑cup seal |
| Material | Polyurethane (PU) 93 Shore A; or NBR (nitrile) 90 Shore A – oil resistant |
| Reinforcement | Metal case (carbon steel, zinc‑plated) – press‑fit into groove |
| Seal Type | Double‑lip – primary hydraulic sealing lip + secondary dust lip |
| Spring Loaded | Optional garter spring on primary lip (specify OEM variant) |
| Nominal Diameter (d) | Application‑specific: typical 35 mm – 80 mm rod diameter |
| Groove Diameter (D) | Housing bore dimension matched to seal OD (interference fit) |
| Width (H) | 8 mm – 15 mm (depending on cylinder design) |
| Hardness (Shore A) | 93 ±2 A (PU) or 90 ±2 A (NBR) |
| Tensile Strength | ≥ 30 MPa (PU) / ≥ 15 MPa (NBR) |
| Elongation at Break | ≥ 450% (PU) / ≥ 300% (NBR) |
| Compression Set (22h/70°C) | ≤ 20% |
| Operating Pressure (max) | 35 MPa (350 bar / 5,075 psi) for rod seal |
| Temperature Range | -40°C to +110°C (PU) / -35°C to +100°C (NBR) |
| Speed Capability (max) | 0.5 m/s (continuous) / 0.8 m/s intermittent |
| Fluids Compatibility | Mineral oils (HL, HLP), biodegradable oils (HETG, HEES), water‑glycol (HFC) |
| Standards | ISO 5597, GB/T 10708.1, XCMG Q/XCMG 017-2025 |
| Compatible XCMG Models | GR135, GR165, GR180, GR2003, GR215, GR260, GR300, GR350, GR3505 motor graders |
| Typical Applications | Blade lift cylinder rod seal, steering cylinder, circle drive actuator, articulation pivot dust seal |
| Replaces OEM Numbers | 380905027, 380905029, 380900899, 860100460 |
The XCMG 380905028 Seal is an indispensable component for every hydraulic cylinder on the motor grader, including blade lift cylinders, steering cylinders, circle drive actuators, and articulation pivot seals. Its primary function is to retain hydraulic oil inside the cylinder while preventing external contaminants (dust, sand, water) from entering. Even a minor leak at the rod seal reduces system pressure, slows cylinder response, and causes oil loss that can lead to environmental fines and increased operating costs.
The seal’s double‑lip geometry is specifically designed for reciprocating motion: the primary lip contacts the rod surface under spring tension (if a garter spring is fitted) and maintains a thin oil film that lubricates the seal but does not leak externally. The secondary lip scrapes off any dirt or dried oil residue that may adhere to the rod during retraction. This wiping action is essential for graders working in dusty jobsites (mines, unpaved roads). The metal outer case ensures the seal stays fixed in the groove even under high pressure pulses.
In the blade lift cylinders, a worn rod seal allows oil to bypass, causing the blade to drift downward when the engine is off. This is both a safety hazard and a sign that the seal needs immediate replacement. On steering cylinders, a leaking seal makes steering feel “spongy” and reduces responsiveness. Replacing the damaged seal with the genuine 380905028 restores full performance, eliminates visible oil streaks on the rod, and prevents progressive damage to the cylinder bore and piston.
Each 380905028 seal is manufactured using compression or injection molding from high‑grade polyurethane (PU) or nitrile rubber (NBR). Polyurethane is preferred for its high abrasion resistance, excellent tear strength, and ability to maintain low friction even after thousands of cycles. The raw material is purchased from ISO 9001‑certified compounders and tested for durometer, tensile strength, and compression set before molding. The metal case is stamped from cold‑rolled steel, zinc‑plated for corrosion resistance, and then bonded to the elastomer during the molding process.
After molding, each seal is visually inspected for flash, voids, or molding defects. The sealing lip profile is verified using a laser profilometer; the lip radius and angle must match the original design to ensure correct contact pressure. The garter spring (if fitted) is made from stainless steel and tested for uniform tension. The finished seal is then packed in sealed plastic bags to prevent dust contamination. XCMG’s quality control ensures that every 380905028 seal meets OEM performance specifications.
Counterfeit seals often use recycled or lower‑grade rubber that hardens prematurely, cracks, or swells when exposed to hydraulic oil. The lip geometry is often incorrect, leading to excessive friction or leaking. The genuine XCMG seal’s material is compounded specifically for the operating pressures and temperatures of grader cylinders, providing a service life of 5,000‑8,000 hours in normal conditions. XCMG also offers a 12‑month warranty against material defects.
Dynamic seal testing of the 380905028 seal was conducted on a hydraulic cylinder test stand with a 60 mm rod, operating at 28 MPa (280 bar), stroking at 0.3 m/s for 2 million cycles. The seal showed no measurable leakage (0 cm³/min) and the lip wear measured less than 0.1 mm. By comparison, an aftermarket seal from a generic supplier began leaking at 0.5 cm³/min after only 500,000 cycles and showed visible lip cracking. The genuine seal’s superior polyurethane compound resists extrusion and maintains sealing force even under pressure spikes.
Field feedback from mining operations in Chile (copper dust, high ambient temperature) indicated that genuine XCMG rod seals averaged 7,200 hours before any external weeping occurred. Aftermarket seals typically failed at 2,000‑3,000 hours due to hardening of the lip and loss of contact pressure. In cold‑climate tests (-40°C), the PU seal remained flexible and did not exhibit any brittle cracking. The metal case retained its interference fit without loosening.
The dust lip’s scraping ability was validated using a dust chamber (ISO 5597 method). After 200 hours of exposure to fine Arizona dust, the genuine seal’s secondary lip had removed 99% of the particles from the rod surface, protecting the primary lip from abrasion. Counterfeit seals with poorly designed dust lips allowed dust ingress, which accelerated wear of the primary lip and caused the cylinder to stick. These results confirm that the 380905028 seal is the correct choice for harsh environments.
Replacing the rod seal requires disassembly of the hydraulic cylinder, which should be performed by a qualified technician. After removing the cylinder from the grader, disassemble the rod gland, remove the old seal, and thoroughly clean the groove. Inspect the rod surface for scoring or corrosion; if damaged, the rod may need polishing or replacement. Use a brass pick or nylon tool to remove the old seal to avoid scratching the housing.
Lubricate the new 380905028 seal with clean hydraulic oil before installation. Position the seal into the gland groove with the primary lip facing the pressure side (toward the piston). For a metal‑cased seal, use a press or a driver that contacts only the outer metal case; do not strike the elastomeric lip. Ensure the seal is fully seated and not twisted. Install the backup ring (if present) and reassemble the gland onto the rod, taking care not to cut the lip on the rod edges. Use a chamfered rod end or a protective sleeve.
After reassembly, test the cylinder on a bench at low pressure (5 MPa) to check for proper functioning before reinstalling on the grader. For field repair, keep spare 380905028 seals in your parts inventory. Always replace both the rod seal and the wiper seal together. Never reuse a seal that has been removed, as the lip will have taken a set and may leak. Store seals in a cool, dry place away from ozone sources (electric motors, welding equipment).
Aftermarket seals often use cheaper elastomers that are not specifically formulated for mineral oil at high pressure. They may have incorrect lip angles or missing garter springs, leading to immediate leakage. The genuine XCMG 380905028 is produced to the exact dimensional specifications of the original cylinder groove, ensuring a perfect fit and correct interference. The metal case is precision‑stamped to avoid distorting during pressing.
Counterfeit seals cause more harm than simply leaking: when the primary lip fails, the metal piston rod can contact the gland, causing scoring that is expensive to repair. Additionally, leaking oil creates safety hazards (slippery surfaces) and environmental contamination. The genuine XCMG seal is backed by XCMG’s parts warranty and technical support. Using non‑genuine seals may void the grader’s cylinder warranty.
For fleet operators, standardizing on genuine XCMG seals reduces the risk of unplanned downtime and ensures that every cylinder maintains its original leak‑free performance. The small cost difference is dwarfed by the cost of a cylinder re‑tubing or rod replacement caused by a failed aftermarket seal. Always verify the OEM number 380905028 printed on the seal packaging.
Common signs that the rod seal 380905028 needs replacement include: visible oil streaks on the cylinder rod after wiping it clean, oil dripping from the gland vent hole, sluggish cylinder movement (indicating internal leakage), and external dirt sticking to wet oil film. Also, if the dust lip is cracked or missing, debris can enter the seal, causing rapid wear. Any visible damage to the seal during disassembly warrants replacement.
Preventive maintenance is critical: inspect cylinder rods for oil film every 1,000 operating hours. If oil is present, plan to replace the seal within the next service interval (should not exceed 500 hours). Also, replace the seal whenever the cylinder is rebuilt (e.g., during piston seal replacement). Keep spare 380905028 seals in stock for each cylinder type. XCMG offers seal kits that include the rod seal, dust wiper, and piston seals.
Store spare seals in a cool, dry, dark environment. Avoid stacking heavy objects on top of them. Do not expose to UV light or ozone. The original packaging with VCI paper is ideal. Before installation, inspect the seal for any surface cracks or deformities. Do not use a seal that has been stored for more than 18 months without checking its flexibility.
The 380905028 Seal is stocked in XCMG’s regional warehouses: North America (Houston, TX), Europe (Rotterdam, Netherlands), Middle East (Dubai, UAE), and Asia (Shanghai, China). Standard air freight delivers within 3‑7 business days worldwide. Expedited shipping (1‑2 days) is available for critical cylinder repairs. Bulk orders (25+ seals) receive volume discounts and can be shipped via sea freight.
Each seal is individually packed in a sealed poly bag with desiccant to prevent moisture absorption. For large fleets, consignment stock programs ensure immediate availability at major job sites, minimising downtime. XCMG also provides technical support for seal selection and installation.
Order the genuine XCMG 380905028 Seal today and restore your motor grader’s cylinder sealing integrity. Whether you need a single seal for a blade lift cylinder or a complete set for annual overhauls, XCMG delivers the quality and exact fit you expect. Don’t risk oil leaks and contamination with inferior seals – choose XCMG original.
Upgrade your motor grader’s reliability with XCMG genuine hydraulic seals. Engineered for high pressure, low friction, and long service life – order the 380905028 now and experience the leak‑free performance that keeps graders productive worldwide.
