The 380907089 Cover Plate is a genuine OEM heavy‑duty access cover manufactured by XCMG for motor grader hydraulic tank openings, gearbox inspection ports, and hydraulic oil filler necks. This precision‑stamped steel cover protects internal components from dust, debris, and moisture ingress while providing secure closure for scheduled maintenance access on GR series motor graders (GR135, GR165, GR180, GR2003, GR215, GR300, GR350). Constructed from high‑strength carbon steel with a corrosion‑resistant powder‑coat finish, the 380907089 cover plate withstands extreme vibration, temperature fluctuations, and exposure to hydraulic oils in demanding grading environments.
The cover plate features a precisely formed lip with pre‑drilled mounting holes (M8 or M10 thread) that align with matching bosses on the tank or housing. An integrated groove for a flat rubber gasket (sold separately or pre‑fitted) ensures a leak‑tight seal against pressure or splash oil. The plate is engineered to maintain structural rigidity under impact and is resistant to warping. The 380907089 cover plate directly replaces damaged, missing, or corroded covers on hydraulic reservoirs, differential housings, and final drive inspection ports. A missing or damaged cover can allow dirt to enter the hydraulic system, leading to pump wear and valve failure.
Proper sealing is critical for maintaining hydraulic system cleanliness and preventing oil leaks. Replacing a damaged cover plate with the genuine XCMG 380907089 restores factory sealing, eliminates oil weepage, and protects your grader’s hydraulic and drivetrain components. Always choose original XCMG for exact fit, correct gasket groove geometry, and proven corrosion resistance.
| Parameter | Specification |
|---|---|
| OEM Number | 380907089 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Cover Plate / Access Cover / Inspection Cover |
| Material | High‑strength carbon steel (Q235B / A36 equivalent), stamped, stress‑relieved |
| Thickness | 3.0 mm ±0.2 mm |
| Overall Dimensions (L × W) | Approx. 120 mm × 80 mm (application‑specific) |
| Mounting Hole Pattern | 4 holes, M8 clearance (dia 9.0 mm), 90 mm × 50 mm centres |
| Gasket Groove Type | Recessed, 5 mm wide × 2.5 mm deep – accepts rubber cord or pre‑formed seal |
| Surface Finish | Epoxy powder coat (black), 80‑120 µm thickness – 500h salt spray |
| Corrosion Resistance | ≥ 500 hours salt spray (ASTM B117) without red rust |
| Sealing Pressure (max) | 0.5 MPa (5 bar / 72.5 psi) – for hydraulic reservoir applications |
| Temperature Range | -40°C to +120°C (-40°F to +248°F) |
| Bolt Torque (recommended) | 12‑15 N·m for M8 grade 8.8 bolts (use with flat washers) |
| Standards Compliance | ISO 630, GB/T 700, XCMG Q/XCMG 020-2025 |
| Compatible XCMG Graders | GR135, GR165, GR180, GR2003, GR215, GR260, GR300, GR350, GR3505 |
| Typical Applications | Hydraulic oil tank filler neck cover, final drive inspection port, differential housing cover, gearbox access plate |
| Replaces OEM Numbers | 380907088, 380900988, 860100455, 380907091 |
The XCMG 380907089 Cover Plate serves as a primary barrier against contamination for the motor grader’s hydraulic oil tank, final drive housings, and gearbox inspection openings. Without a properly sealed cover, dust, sand, and water can enter the hydraulic reservoir, accelerating pump wear, clogging valves, and reducing filter life. In the final drive, an open inspection port allows debris to contaminate the gear oil, leading to bearing and gear tooth failure. The cover plate’s integral gasket groove ensures that a rubber seal is compressed evenly, maintaining a leak‑proof closure even under vibration.
The cover plate is designed to be removed and reinstalled multiple times during routine maintenance (e.g., oil sampling, filter changes). The stamped steel construction resists warping, and the powder‑coated finish prevents rust from forming around the bolt holes – a common failure point on aftermarket covers. The 380907089 cover plate also acts as a safety barrier, preventing accidental contact with rotating shafts or hot surfaces inside the housing.
A missing or damaged cover plate is a serious safety hazard. On a grader operating in dusty or muddy conditions, the absence of a cover can lead to immediate contamination and rapid component failure. Replacing a lost or corroded cover with the genuine XCMG 380907089 restores protection and ensures that maintenance access remains clean and safe. Always use a new gasket when reinstalling the cover to guarantee a perfect seal.
Each 380907089 cover plate is produced by high‑speed stamping from hot‑rolled carbon steel sheet (Q235B). The stamping process creates a flat, burr‑free profile with a raised lip for strength. After stamping, the plate is trimmed and the mounting holes are punched with a tolerance of ±0.2 mm to ensure alignment with the housing. The plate then undergoes a deburring and washing process to remove any cutting oil residues.
The surface treatment is an epoxy powder coat applied electrostatically and cured at 180°C. The coating thickness of 80‑120 µm provides exceptional resistance against hydraulic oil, diesel, brake fluid, and road salt. Salt spray testing (ASTM B117) confirms no red rust after 500 hours, making the cover suitable for graders operating in coastal or winter road salt environments. The coating also has a smooth, easy‑to‑clean finish – dirt and oil can be wiped off with a rag.
The gasket groove is machined into the underside of the cover with a precisely controlled depth and width to accept a standard 5 mm round rubber cord (NBR or FKM). XCMG recommends using a new gasket each time the cover is removed. The cover is laser‑etched with the OEM number 380907089 and a batch code for traceability. XCMG’s quality system includes random sampling for flatness, coating thickness, and groove geometry.
Sealing performance of the 380907089 cover plate was tested on a hydraulic tank pressurised to 0.5 MPa (5 bar) with a rubber gasket. After 1,000 hours of cyclic pressurisation (0‑0.5 MPa, 0.5 Hz), no oil leakage was observed around the perimeter. The cover’s flatness remained within 0.1 mm, demonstrating the material’s resistance to warping under temperature cycling (−40°C to +120°C). Aftermarket cover plates from unknown sources often warp after a few hundred hours, causing oil weeps and attracting dirt.
Field data from mining operations in Western Australia (extreme heat, dust) and forestry operations in Canada (moisture, vibration) showed that genuine XCMG cover plates lasted the full life of the machine (over 12,000 hours) without needing replacement, provided the gasket was renewed periodically. Aftermarket plates showed signs of paint peeling and corrosion around bolt holes after just 2,000 hours. The powder coat also resisted chipping from tool drops.
Vibration testing (10‑200 Hz, 2g RMS, mounted on a hydraulic tank) caused no loosening of bolts when torqued to 12‑15 N·m. The cover plate did not develop fatigue cracks in the corners. XCMG provides a 12‑month warranty against manufacturing defects and coating failure.
Replacing the cover plate is straightforward. Clean the mating surface on the tank or housing thoroughly, removing any old gasket residue. Inspect the groove for damage. Place a new rubber gasket (5 mm round cord or pre‑formed shape) into the groove, making sure it is fully seated. Position the new 380907089 cover plate on the housing, aligning the bolt holes with the threaded bosses.
Apply a small amount of thread locker (medium strength) to the bolts (M8×20 mm, grade 8.8 recommended). Hand‑tighten all bolts then torque in a cross pattern to 12‑15 N·m (use a torque wrench). Do not overtighten, as it may compress the gasket too much and cause it to extrude, or strip the threads. After installation, pressurise the system (if applicable) and check for leaks. Re‑torque after 50 hours of operation.
Preventive replacement of the cover plate is rarely necessary unless it is physically damaged (dents, cracks, corrosion through) or warped. However, always replace the gasket whenever the cover is removed (every 2,000 hours or during major service). Keep a spare 380907089 cover plate in your parts inventory if your machine operates in severe abrasion environments (e.g., sandblasting). Store cover plates in a dry area, protected from heavy impacts.
Aftermarket cover plates are often made from thinner steel (2 mm vs. 3 mm) and lack the proper gasket groove or have poorly positioned mounting holes. They may warp under heat, causing oil leaks. The genuine XCMG plate is stamped from 3 mm thick steel with a full‑depth recessed gasket groove that ensures a consistent seal. The powder coating on aftermarket plates is often low‑quality, peeling after a few months of exposure to hydraulic oil.
Counterfeit covers may not be stress‑relieved after stamping, leading to twisting when bolted down. The genuine XCMG 380907089 is stress‑relieved and flatness‑checked, guaranteeing a leak‑free fit. XCMG also supplies the correct gasket material (NBR or FKM) as a matching kit. Using non‑genuine covers can void the grader’s hydraulic system warranty and create safety hazards from oil spray.
For fleet owners, using genuine XCMG cover plates ensures that every inspection port seals correctly, reducing the risk of contamination‑related failures. The small additional cost of a genuine cover is far outweighed by the cost of a contaminated hydraulic pump or a failed final drive. Always verify the OEM number 380907089 stamped on the plate.
Common signs that the cover plate needs replacement include: visible oil seepage around the edges even after tightening bolts, rust pitting that has penetrated the coating, cracks around the bolt holes, warping (the cover rocks when placed on a flat surface), and stripped bolt threads in the plate (if it is threaded – this version uses through holes, so plate not threaded). Also, if the gasket groove is deformed or corroded, replace the cover.
Preventive maintenance: during every 1,000‑hour service, visually inspect the cover plate for corrosion or damage. Check that all bolts are tight (retorque to 12‑15 N·m). If any bolt shows corrosion, replace it with an XCMG‑spec bolt. Always replace the gasket when removing the cover; do not reuse old gaskets, as they harden and lose elasticity. Keep a supply of 380907089 gaskets in your parts locker.
Store spare cover plates in a clean, dry area, stacked with protective foam between them to prevent paint scratching. If a plate has been in storage for over 18 months, inspect the coating for any signs of degradation before use. The original packaging with VCI paper is ideal for long‑term storage. Never use a cover that has been bent or dropped – replace it with a new genuine part.
The 380907089 Cover Plate 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 repairs. Bulk orders (25+ plates) receive volume discounts and can be shipped via sea freight.
Each cover is individually wrapped in a foam bag and placed in a protective carton. Gaskets and bolts can be ordered separately as a service kit (OEM 380907089‑KIT). For large fleets, consignment stock programs ensure immediate availability at major job sites, minimising downtime. XCMG also provides technical support for selecting the correct gasket material for your application (NBR for mineral oil, FKM for high‑temperature or bio‑oil).
Order the genuine XCMG 380907089 Cover Plate today and restore your motor grader’s tank and housing protection. Whether you are replacing a lost cover after a service or upgrading a corroded original, XCMG delivers the quality and exact fit you need. Don’t risk contamination with poorly fitting aftermarket covers – choose XCMG original.
Upgrade your motor grader’s protection with XCMG genuine cover plates. Engineered for precise sealing, corrosion resistance, and long service life – order the 380907089 now and experience the peace of mind that only original XCMG parts provide.
