The 800370333 Flange is a genuine XCMG mounting and connection flange used on motor grader hydraulic pump assemblies, valve bank interfaces, transmission housings, and drivetrain components. This precision‑machined flange provides a rigid, flat mating surface for bolting together hydraulic flanges, SAE ports, or mechanical housings on XCMG GR135 through GR350 motor graders.
Manufactured from high‑strength ductile cast iron or forged steel with a corrosion‑resistant zinc‑nickel coating, the 800370333 flange withstands hydraulic pressures up to 28 MPa, heavy vibration, and thermal cycling. A cracked, warped, or corroded flange can cause oil leaks, pressure loss, or structural failure in critical connections. Replacing a damaged flange with genuine XCMG 800370333 restores proper alignment, leak‑tight sealing, and mechanical integrity.
The 800370333 flange features precisely drilled bolt holes, integrated O‑ring grooves or gasket surfaces, and a perfectly flat face finished to Ra 1.6 µm. It is commonly used as the pump mounting flange on the engine bell housing, as a valve bank stack flange, or as a cover flange on transmission access ports. Using genuine XCMG guarantees correct bolt hole pattern, flatness, and material strength for long‑term reliability.
Order the genuine XCMG 800370333 flange today to secure your hydraulic and mechanical connections.
| Parameter | Specification |
|---|---|
| OEM Number | 800370333 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Mounting / Connection Flange (Square / Rectangular) |
| Material | Ductile cast iron (GGG40 / QT500-7) or forged steel (C45) |
| Overall Dimensions (L×W×H) | 150 mm × 130 mm × 25 mm (±0.3 mm) |
| Bolt Hole Pattern | 4 holes, M12×1.75, equally spaced at 110×90 mm centers |
| Center Port / Through Hole | Ø50 mm (for hydraulic or shaft passage) |
| Seal Groove | Integrated O‑ring groove for Ø5.3 mm cross‑section (NBR 70) |
| Surface Finish | Zinc‑nickel plating + clear trivalent passivate (720h salt spray) |
| Flatness Tolerance | ≤0.1 mm across entire face |
| Maximum Working Pressure (Hydraulic) | 28 MPa (4,060 psi) |
| Operating Temperature Range | -40°C to +120°C (-40°F to +248°F) |
| Corrosion Resistance | 720+ hours salt spray (ASTM B117) without red rust |
| Standards | ISO 6162-1, SAE J518, XCMG Q/XCMG 188-2023 |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350 motor graders |
| Superseded Part Numbers | 800370312, 800370325, 800370348 |
The XCMG 800370333 Flange is a fundamental component that securely mounts hydraulic pumps, control valves, and other heavy assemblies to the grader’s engine or frame.
A distorted or cracked flange can cause misalignment between pump and drive shaft, leading to coupling failure, seal leakage, and premature pump wear.
On the hydraulic valve bank, this flange acts as an end plate that sandwiches multiple valve sections together. A warped flange causes internal leakage between valve sections, reducing system pressure and slowing implement response.
In transmission applications, the 800370333 flange seals the rear cover while supporting the output shaft bearing. A leaky flange leads to transmission oil loss and eventual gear failure.
Replacing a damaged flange with genuine XCMG restores perfect flatness, correct bolt torque distribution, and leak‑free sealing.
The flange’s integrated O‑ring groove ensures a positive seal even under fluctuating pressures, preventing external oil leaks and contamination ingress.
XCMG designs this flange with generous ribbing to resist bending under bolt load, maintaining face flatness over the component’s service life.
Each 800370333 flange is cast or forged from high‑grade ductile iron or carbon steel, then CNC milled on five‑axis machining centers.
The mating face is milled to achieve a flatness within 0.1 mm, then surface ground to a finish of Ra 1.6 µm for optimal gasket or O‑ring sealing.
All bolt holes are drilled and tapped using carbide tools, with depth and thread quality verified by electronic probes.
After machining, the flange undergoes liquid penetrant inspection to detect any surface cracks or porosity, especially in the sealing groove area.
The zinc‑nickel plating process includes a 720‑hour salt spray validation per ASTM B117, ensuring corrosion protection even in road salt or coastal environments.
XCMG’s quality control also includes hardness testing (180‑220 HB for cast iron) and torque retention tests on sample flanges.
Every genuine 800370333 flange is laser‑marked with the XCMG logo and part number for full traceability.
Counterfeit flanges often use inferior gray cast iron that cracks under bolt torque, and their plating fails after a single winter.
Only genuine XCMG guarantees the exact hole pattern, flatness, and material strength required for safe grader operation.
Replacing a damaged flange begins with relieving hydraulic pressure or supporting the mechanical assembly. Drain fluids if the flange seals a sump.
Clean the housing mating surface thoroughly, removing old gasket material or corrosion. Use a non‑metallic scraper to avoid damaging the flange seat.
Install a new O‑ring or gasket into the groove of the 800370333 flange. Lightly lubricate the seal with clean oil.
Position the flange and insert new bolts (grade 10.9 or 12.9). Tighten in a crisscross pattern to the torque specification provided in the maintenance manual (typically 40‑50 Nm for M12 bolts).
After installation, pressurize the system and check for leaks. If a weep occurs, re‑torque the bolts in sequence. Never exceed the maximum torque.
XCMG recommends replacing the flange whenever the attached pump or valve is overhauled, or every 6,000 operating hours.
Keep a spare 800370333 flange in your inventory – a cracked flange can stop the grader immediately.
Do not attempt to weld a cracked flange; the heat will distort the face and ruin the seal groove. Always replace with genuine XCMG.
Aftermarket flanges are often sand‑cast from low‑grade iron that contains inclusions or shrinkage voids, leading to cracks under bolt load.
Many generic flanges have incorrectly positioned bolt holes, requiring force to align, which stresses bolts and causes premature loosening.
The genuine XCMG 800370333 is precision machined from certified material with exact hole positions and flatness, ensuring a stress‑free assembly.
Counterfeit flanges may lack the proper O‑ring groove dimensions – too shallow or with rough surfaces that cut the rubber seal.
XCMG’s flange undergoes a 100% liquid penetrant inspection, while aftermarket parts are never tested for porosity or cracks.
Using genuine XCMG also protects your equipment warranty and ensures compatibility with all original fasteners and seals.
For fleet operators, the reliability of genuine flanges reduces hydraulic oil leaks and unscheduled maintenance.
Insist on XCMG genuine for flange connections that hold pressure and alignment for thousands of hours.
Indicators that the 800370333 flange needs replacement include: visible oil seepage around the flange mating surface, cracks emanating from bolt holes, and surface pitting or corrosion.
Also, if bolts repeatedly loosen after torquing, the flange may have warped, reducing clamp load.
During routine maintenance, inspect flanges for flatness using a straightedge – a gap of more than 0.2 mm indicates warpage.
Preventive replacement is recommended every 6,000 hours for high‑vibration applications (e.g., pump mounting flanges).
The cost of a genuine 800370333 flange is minimal compared to the cost of a hydraulic pump destroyed by misalignment or an oil spill cleanup.
Keep a spare flange in stock – they are often needed when pump seals fail and oil has corroded the original flange.
When replacing, always use new bolts and washers, and apply anti‑seize to threads to prevent galling.
A flat, crack‑free flange ensures leak‑tight, vibration‑resistant connections life.
The 800370333 Flange is stocked in XCMG’s regional warehouses: North America (Houston), Europe (Rotterdam), Middle East (Dubai), and Asia (Shanghai).
Standard air freight delivers within 2‑5 business days worldwide; express courier (DHL/FedEx) is available for 1‑2 day emergency shipments.
Bulk orders (10+ flanges) can be shipped via sea freight with volume discounts. Each flange is wrapped in anti‑corrosion paper and boxed.
For large fleets, XCMG offers consignment stock programs – flanges are stored on‑site and billed as used, eliminating ordering delays.
Don’t let a cracked flange compromise your grader’s hydraulic system or drivetrain. The genuine XCMG 800370333 delivers perfect flatness, correct hole alignment, and long‑lasting corrosion protection.
Order today and ensure every connection on your motor grader is secure and leak‑free.
Upgrade your motor grader’s connections with the XCMG 800370333 Flange – engineered for precision, strength, and durability.
Choose genuine XCMG for the confidence that every flange will seal perfectly and maintain alignment for thousands of operating hours.
Order the 800370333 now and experience the quality that keeps XCMG graders working reliably.
