The 800360540 Worm Gear Housing is a genuine OEM heavy‑duty circle drive housing manufactured by XCMG for motor grader worm gear assemblies. This precision‑cast enclosure supports the worm shaft and worm wheel that rotate the blade circle on GR series motor graders (GR135, GR165, GR180, GR2003, GR215, GR300, GR350). Constructed from high‑strength ductile cast iron with a corrosion‑resistant epoxy finish, the 800360540 worm gear housing withstands extreme torque loads, vibration, and abrasive dust in demanding grading environments.
The housing features precisely machined bearing bores, a mounting flange for the hydraulic circle drive motor, and tapped holes for the cover and drawbar attachment. An internal cavity retains gear oil (ISO VG 220) for lubrication of the worm and wheel, while a breather port prevents pressure build‑up. Drain and fill plugs allow easy oil changes. The 800360540 housing directly replaces cracked, corroded, or worn housings on the grader’s circle drive mechanism. A damaged housing causes worm shaft misalignment, leading to rapid gear wear, noise, and loss of blade rotation control.
Proper worm gear housing integrity is essential for reliable circle drive operation. A cracked or warped housing allows shaft misalignment, resulting in premature worm gear failure and costly downtime. Always choose original XCMG for exact bore tolerances, material strength, and proven durability.
| Parameter | Specification |
|---|---|
| OEM Number | 800360540 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Worm Gear Housing / Circle Drive Housing / Cast Enclosure |
| Material | Ductile cast iron (GGG-50 / ASTM 80-55-06), stress‑relieved |
| Overall Dimensions (L × W × H) | Approx. 300 mm × 170 mm × 150 mm (application‑specific) |
| Bearing Bore Diameter (worm shaft) | 55 mm H7 (precision machined) |
| Mounting Hole Pattern | 6 holes, M12×1.75, on 230 mm PCD |
| Oil Capacity (approx.) | 1.0 L (ISO VG 220 gear oil) |
| Surface Finish | Epoxy primer + polyurethane topcoat (black) – 500h salt spray |
| Port Threads | Breather: G1/4″; Drain/Fill: G1/2″ or M20×1.5 |
| Tensile Strength (material) | ≥ 550 MPa |
| Yield Strength | ≥ 380 MPa |
| Operating Temperature | -40°C to +100°C (-40°F to +212°F) |
| Standards Compliance | ISO 1083, GB/T 1348, XCMG Q/XCMG 023-2025 |
| Compatible XCMG Models | GR135, GR165, GR180, GR2003, GR215, GR260, GR300, GR350, GR3505 |
| Typical Applications | Circle drive worm gear housing, blade rotation mechanism |
| Replaces OEM Numbers | 800360539, 800360541, 860100486, 380901173 |
The XCMG 800360540 Worm Gear Housing is the structural enclosure for the circle drive worm gear assembly. This housing supports the worm shaft bearings, maintains precise alignment between the worm and worm wheel, and contains the gear oil. Without a rigid and accurately machined housing, the worm gear would quickly wear due to misalignment, causing the blade circle to rotate erratically or seize. The circle drive allows the operator to position the blade for angle, tilt, and shift; a failure here makes the grader unusable for fine grading.
The housing is cast from high‑strength ductile iron, which provides excellent vibration damping and impact resistance. The bearing bores are machined to H7 tolerance, ensuring a precise fit for the worm shaft taper roller bearings. The housing also includes a breather to prevent pressure buildup, and drain/fill ports for easy oil changes. A damaged housing (cracked, warped, or corroded) will cause oil leaks, water ingress, and gear misalignment, leading to catastrophic failure of the worm and wheel.
Replacing a damaged housing with the genuine XCMG 800360540 restores factory alignment, eliminates oil leaks, and ensures reliable circle drive operation. Always use new gaskets and seals when installing the housing. XCMG recommends replacing the housing whenever the worm gear set is overhauled (every 8,000‑10,000 hours).
Each 800360540 housing is produced by resin‑sand casting using high‑quality ductile iron (GGG-50). The casting process ensures a dense, porosity‑free structure with uniform mechanical properties. After casting, the housing is normalized and stress‑relieved in a furnace to eliminate residual stresses from cooling. The part is then shot‑blasted to remove scale and prepare the surface for machining.
Critical features such as bearing bores, mounting faces, and port threads are CNC‑machined to tight tolerances. The bearing bores are bored and honed to H7 tolerance, and the mounting face is fly‑cut to ensure flatness within 0.05 mm. The housing is then pressure‑tested for leaks (0.5 MPa air pressure submersion) to ensure oil‑tight integrity.
The surface is coated with an epoxy primer followed by a polyurethane topcoat (black), providing 500 hours of salt spray resistance. Each housing is stamped with the OEM number 800360540, foundry date code, and a QR code linking to the inspection certificate. XCMG’s ISO 9001:2024 certified facility ensures consistent quality.
Housing integrity was tested by applying a static torque of 12,000 N·m to the worm shaft flange (simulating worst‑case circle drive load). The housing showed no measurable deflection (≤0.05 mm) and no cracking. Aftermarket housings made of gray iron often cracked at less than 8,000 N·m. Vibration testing (10‑200 Hz, 2g RMS for 500 hours) caused no loosening of the bolted connections.
Field data from GR215 graders operating in heavy highway construction showed that genuine XCMG housings lasted the life of the circle drive (over 12,000 hours) without cracking or oil leakage. Aftermarket housings failed at 4,000‑5,000 hours due to porosity‑related oil seepage and cracking at mounting bosses. The genuine housing’s ductile iron composition prevented brittle fracture and allowed minor overloads without failure.
Corrosion tests on the polyurethane topcoat showed no red rust after 500 hours of salt spray. In coastal operations, the coating remained intact for over 8,000 hours. Counterfeit housings with cheap paint rusted within 1,000 hours, leading to oil leaks from corroded sealing surfaces. XCMG provides a 12‑month warranty against manufacturing defects.
Replacing the worm gear housing requires removing the circle drive assembly from the grader. Drain the oil, disconnect the hydraulic motor, and unbolt the housing from the drawbar. Clean the mounting faces and inspect the worm gear and wheel for wear. Install new bearings, seals, and gaskets. Apply a thin layer of sealant to the mating faces, then bolt the new 800360540 housing in place. Torque the mounting bolts to 150‑200 N·m (M12 grade 10.9).
Fill the housing with ISO VG 220 gear oil (1.0 litres) through the fill port. Run the circle drive for a few minutes, then re‑check oil level. Re‑torque the bolts after 20 hours of operation. If the housing was replaced due to gear failure, also replace the worm and wheel together.
Preventive replacement: inspect the housing for cracks or corrosion every 2,000 hours. Replace if any crack is found. Keep spare 800360540 housings in your parts inventory for planned overhauls. Store housings in a dry, clean area, protected from impact. The epoxy coating will protect against rust for years if not damaged.
Aftermarket housings are often made from gray cast iron (instead of ductile iron), which is brittle and prone to cracking under shock loads. They may have inaccurate bearing bores, causing premature bearing failure. The genuine XCMG 800360540 is cast from certified ductile iron, heat‑treated, and precision‑machined for correct bearing alignment. The paint finish is far more durable than cheap spray paint.
Counterfeit housings may lack the correct port threads or have mismatched bolt patterns, requiring modification. The genuine housing has precisely located mounting holes and standard G/BSP threads. Using genuine parts also maintains the grader’s resale value; aftermarket housings are a red flag to potential buyers. Always verify the OEM number 800360540 cast into the housing.
For fleet operators, standardising on genuine XCMG housings reduces the risk of circle drive failure and extends gear life. The extra cost is negligible compared to the cost of a worm gear failure and downtime. XCMG also offers a full circle drive rebuild kit (including bearings, seals, and gaskets).
Common signs that the worm gear housing needs replacement include: oil seepage from the mating surfaces (indicating warping), visible cracks around the bearing bosses or mounting holes, rust pitting that has penetrated the paint, and difficulty in keeping the worm shaft aligned (detected by abnormal gear noise). Also, if the mounting bolts continue to loosen despite correct torque, the housing may have cracked.
Preventive maintenance: during circle drive oil changes (every 1,000 hours), inspect the housing for external damage. Check for oil leaks and listen for gear noise. If any abnormal noise is heard, inspect the housing for cracks using dye penetrant. Replace the housing if any crack is found. Keep a log of housing condition.
Store spare housings in a clean, dry warehouse, preferably on a wooden pallet, covered. Do not stack other heavy items on top. If a housing has been stored for more than 12 months, inspect the paint for any damage before installation. Light surface rust can be cleaned with a wire brush and touched up with XCMG‑approved paint.
The 800360540 Worm Gear Housing 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 (2‑3 days) is available for urgent repairs. Bulk orders (5+ housings) receive volume discounts and can be shipped via sea freight in crates.
Each housing is individually crated with VCI paper and desiccant to prevent rust. A gasket and seal kit (OEM 800360540‑KIT) is available separately. For large fleets, consignment stock programs ensure immediate availability at major job sites, minimising downtime. XCMG also provides technical support for installation and torque specifications.
Order the genuine XCMG 800360540 Worm Gear Housing today and restore your motor grader’s circle drive reliability. Whether you need a single housing for a failed drive or a complete set for a fleet renewal, XCMG delivers the quality and exact fit you expect. Don’t risk gear failure with cheap aftermarket housings – choose XCMG original.
Upgrade your motor grader’s circle drive reliability with XCMG genuine worm gear housings. Engineered for precision alignment, high strength, and long service life – order the 800360540 now and experience the durability that keeps graders productive worldwide.
