The 273100576 Pressure Cover is a genuine OEM heavy‑duty hydraulic tank access cover manufactured by XCMG for motor grader hydraulic oil reservoirs, fuel tanks, and coolant expansion tanks. This precision‑stamped and machined steel cover is designed to seal pressurised fluid compartments, prevent contamination ingress, and allow easy service 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 273100576 pressure cover withstands extreme vibration, temperature fluctuations, and exposure to hydraulic oil, diesel, and moisture in demanding grading environments.
The pressure cover features a precisely formed raised centre section for rigidity, a pre‑drilled gasket groove for a rubber seal, and multiple mounting holes that align with the tank flange. A breather valve port (optional) allows the tank to vent when internal pressure exceeds a set level. The 273100576 cover directly replaces damaged, missing, or corroded covers on hydraulic tanks, ensuring a leak‑tight seal and preventing dirt from entering the hydraulic system. A missing or cracked cover can allow air and dust into the tank, causing pump cavitation, valve sticking, and accelerated oil degradation.
Proper sealing of pressurised fluid compartments is critical for motor grader hydraulic system performance and safety. Replacing a damaged cover with the genuine XCMG 273100576 restores factory sealing, eliminates oil leaks, and protects internal components. Always choose original XCMG for exact bolt pattern, correct gasket groove geometry, and proven corrosion resistance.
| Parameter | Specification |
|---|---|
| OEM Number | 273100576 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Pressure Cover / Hydraulic Tank Access Cover / Reservoir Lid |
| Material | High‑strength carbon steel (Q235B / A36 equivalent), stamped, stress‑relieved |
| Thickness | 4.0 mm ±0.2 mm |
| Overall Dimensions (L × W) | Approx. 180 mm × 140 mm (application‑specific) |
| Mounting Hole Pattern | 4 holes, M8 clearance (dia 9.0 mm), 150 mm × 100 mm centres |
| Gasket Groove | Recessed, 5 mm wide × 3 mm deep – accepts rubber O‑ring or flat gasket |
The XCMG 273100576 Pressure Cover seals the hydraulic fluid reservoir against contamination and pressure loss. The hydraulic system on a motor grader operates at up to 25 MPa, and even a tiny amount of dust or water can cause pump wear, valve stiction, and premature oil degradation. The cover’s rubber gasket (sold separately or pre‑fitted) creates an airtight seal that also prevents oil mist from escaping. A missing or damaged cover allows airborne grit to enter the tank directly, leading to catastrophic hydraulic component failure.
The cover also houses a pressure/vacuum breather valve (optional on some configurations) that maintains the tank at a slight positive pressure relative to atmosphere, preventing moisture ingress while allowing the tank to vent when oil expands due to heat. If the breather is integrated, the 273100576 cover ensures that no external dirt can bypass the filter. In applications where the cover is placed on a fuel tank, it prevents fuel contamination and evaporation.
Replacing a warped, corroded, or cracked pressure cover with the genuine XCMG 273100576 restores a leak‑tight seal, keeps the hydraulic oil clean, and extends component life. The cover’s rigid construction resists deformation even after multiple removals for filter changes or oil sampling. Always use a new gasket when reinstalling the cover and torque the bolts to the correct specification.
Each 273100576 pressure cover is manufactured by high‑speed stamping from hot‑rolled carbon steel sheet (Q235B). The stamping process creates a flat, burr‑free plate with a raised centre boss for added rigidity and a precisely formed gasket groove. After stamping, the cover is trimmed, and the mounting holes are punched with a tolerance of ±0.2 mm. The cover then undergoes deburring and washing 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 this cover ideal for graders operating in coastal or winter road salt environments. The coating is also impact‑resistant and easy to clean – dirt and oil can be wiped off with a rag.
Each cover is stress‑relieved after stamping to eliminate any internal stresses that could cause warping over time. The cover is laser‑etched with the OEM number 273100576 and a batch code for traceability. XCMG’s quality control includes random flatness checks, coating thickness measurement, and verification of the gasket groove geometry using a go/no‑go gauge.
Sealing performance of the 273100576 cover was tested using a hydraulic tank pressurised to 0.1 MPa (1 bar) with a rubber gasket. After 1,000 hours of cyclic pressurisation (0‑0.1 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 covers 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 pressure covers 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 did not develop fatigue cracks in the corners. XCMG provides a 12‑month warranty against manufacturing defects and coating failure.
Replacing the pressure cover is straightforward. Clean the mating surface on the tank 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 273100576 cover on the tank flange, 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 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 273100576 cover in your parts inventory if your machine operates in severe abrasion environments (e.g., sandblasting). Store covers in a dry area, protected from heavy impacts.
Aftermarket pressure covers are often made from thinner steel (2.5 mm vs. 4 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 4 mm thick high‑strength 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 273100576 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 operators, using genuine XCMG pressure covers ensures that every hydraulic reservoir 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 273100576 cast into the plate or printed on the packaging.
Common signs that the pressure cover 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 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 273100576 gaskets in your parts locker.
Store spare covers in a clean, dry area, stacked with protective foam between them to prevent paint scratching. The original packaging with VCI paper is ideal for long‑term storage. If a cover has been in storage for over 18 months, inspect the coating for any signs of degradation before use. Never use a cover that has been bent or dropped – replace it with a new genuine part.
The 273100576 Pressure Cover 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 urgent repairs. Bulk orders (25+ covers) 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 are available as a service kit (OEM 273100576‑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 273100576 Pressure Cover today and restore your motor grader’s hydraulic tank sealing. 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 pressure covers. Engineered for precise sealing, corrosion resistance, and long service life – order the 273100576 now and experience the peace of mind that only original XCMG parts provide.
