The 800370327 Output Gear is a genuine XCMG high‑torque transmission or final drive gear used in motor grader powertrains. This precision‑cut gear transfers power from the differential or planetary carrier to the tandem axles, driving the rear wheels. Manufactured from case‑hardened alloy steel with ground tooth profiles, the 800370327 output gear withstands extreme torsional loads, shock loads during ripping, and continuous heavy‑duty grading cycles.
The 800370327 output gear is a critical final drive component on XCMG GR135, GR165, GR180, GR215, GR260, GR300, and GR350 motor graders. It directly replaces worn, chipped, or cracked gears in the tandem drive housing or transmission output shaft assembly. The gear features optimized tooth geometry for quiet running and high load distribution, reducing contact stress and extending bearing life.
A damaged output gear leads to driveline vibration, oil contamination from metal particles, and eventual loss of drive. Replacing a failed gear with the genuine XCMG 800370327 restores original transmission ratio, noise level, and torque capacity. This gear is heat‑treated to achieve surface hardness of 58‑62 HRC with a ductile core, providing both wear resistance and fatigue strength.
The 800370327 output gear is manufactured to ISO 1328 grade 6-7 precision, ensuring smooth meshing with the mating pinion. Spline or keyway drive features are precisely broached to match the original shaft. Using genuine XCMG ensures proper backlash, tooth contact pattern, and metallurgical integrity – critical for avoiding premature gear failure and costly downtime.
Common applications include the final drive output stage on GR215 and GR260 models, where this gear transmits power from the tandem drive pinion to the axle shaft. Order the XCMG 800370327 to keep your grader moving reliably under the toughest conditions.
| Parameter | Specification |
|---|---|
| OEM Number | 800370327 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Spur / Helical Output Gear (Final Drive) |
| Material | Case‑hardened alloy steel (20MnCr5 / 8620) |
| Hardness (Surface) | 58 – 62 HRC (carburized and quenched) |
| Core Hardness | 30 – 40 HRC (toughness) |
| Number of Teeth | 42 teeth (standard variant – confirm application) |
| Module (Metric) | 4 mm (typical, ISO 54) |
| Pressure Angle | 20° (full depth involute) |
| Face Width | 38 mm (±0.1 mm) |
| Overall Diameter | Approx. 176 mm (tooth tip diameter) |
| Bore / Spline Type | Internal spline (30 teeth × 2.5 mm module) or keyway |
| Tooth Accuracy | ISO 1328 Grade 6 (profile, helix, runout) |
| Maximum Transmitted Torque | 8,000 Nm (5,900 ft‑lb) – dependent on mating gear) |
| Operating Temperature | -40°C to +120°C in gear oil bath |
| Surface Finish (grinding) | Ground and superfinished (Ra ≤ 0.8 µm) |
| Standards | AGMA 2015, ISO 6336, XCMG Q/XCMG 247-2023 |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350 motor graders |
The XCMG 800370327 output gear is the last stage in the grader’s powertrain before the tandem axles and wheels. It takes high torque at reduced speed from the differential or planetary hub and transmits it to the axle shafts.
A broken or badly worn output gear will cause complete loss of drive, leaving the grader immobile. Common failure modes include tooth fracture from shock loads, pitting from inadequate lubrication, or spline wear from improper assembly.
The 800370327 is designed with generous fillet radii and improved core toughness to resist impact cracking when the blade hits buried rocks or frozen ground.
On GR215 and GR260 models, this gear is located inside the tandem drive housing and is bathed in EP gear oil. The tooth profile is optimized for quiet operation and even load sharing across multiple teeth, reducing stress concentrations.
Replacing a worn gear with genuine 800370327 restores original driveline efficiency, reduces backlash‑induced vibration, and prevents secondary damage to bearings and seals caused by metal debris.
Always inspect the mating pinion gear when replacing the output gear; if both are worn, replace them as a matched set for proper contact pattern.
Each 800370327 output gear starts as a forged blank from certified 20MnCr5 steel, which offers excellent hardenability and toughness.
The blank is rough turned, then CNC hobbed to produce the involute tooth form. After hobbing, the gear is carburized in a controlled atmosphere furnace to achieve a 0.8‑1.2 mm case depth.
The teeth are then finish ground using a Reishauer or equivalent gear grinder to achieve grade 6 accuracy, with profile and lead corrections for optimal contact under load.
After grinding, the gear is shot‑peened to introduce compressive residual stresses, drastically improving fatigue resistance against bending loads.
XCMG’s quality control includes 100% magnetic particle inspection for cracks, hardness traverse testing, and coordinate measurement of all critical dimensions.
Sample gears are also fatigue‑tested on a back‑to‑back gear rig for one million cycles at rated torque. Counterfeit gears skip these steps, leading to early failure.
Replacing the output gear requires removing the tandem drive housing or transmission end cover. Drain the gear oil and carefully disassemble the axle components.
Inspect the shaft and bearings for damage; if any wear is found, replace them together. Clean the housing thoroughly to remove any metal fragments from the failed gear.
Heat the new 800370327 gear to approx. 100°C and slide it onto the shaft using an induction heater – never hammer the gear onto the shaft.
Check the backlash with a dial indicator; nominal value is 0.15‑0.25 mm. Adjust shims if necessary to meet specification.
After assembly, fill with the recommended EP90 or EP140 gear oil. Run the grader slowly and listen for unusual noise. If whining is excessive, re‑check backlash and contact pattern.
XCMG recommends replacing both the output gear and the mating pinion gear together, especially if the old gear showed pitting or spalling.
Keep a spare 800370327 output gear for graders in heavy ripping applications – downtime from gear failure can be expensive.
Aftermarket output gears are often machined from low‑grade bar stock without proper heat treatment, leading to rapid tooth wear or catastrophic fracture.
Many generic gears have incorrect profile shift or poor surface finish, causing excessive noise, hot running, and micropitting within a few hundred hours.
The genuine XCMG 800370327 is case‑carburized and ground for accurate tooth geometry, extending gear life to 10,000+ hours under normal service conditions.
Genuine gears also feature a unique XCMG material certification traceable back to the steel mill – counterfeit parts cannot provide this documentation.
Using genuine XCMG ensures that your grader’s driveline warranty remains intact and that the gear will mesh correctly with factory‑spec mating components.
For fleet owners, the slight extra cost of a genuine output gear is offset by lower total maintenance cost and longer machine uptime.
Don’t risk a cheap gear that could shred and send debris through the entire tandem drive – trust XCMG genuine.
Signs that the 800370327 output gear needs replacement include: a whining or rumbling noise from the tandem drive that changes with speed, metal particles on the magnetic drain plug, and visible chipping or pitting on gear teeth when inspected.
Also, if the grader feels “jerky” when engaging forward/reverse, backlash may be excessive due to worn gear teeth.
During routine oil changes (every 1,000 hours), remove the inspection cover and visually check the output gear’s tooth surfaces. Use a borescope if necessary.
Preventive replacement is recommended every 8,000 hours for heavy‑duty graders, or immediately if any tooth damage is found.
The cost of a genuine 800370327 output gear is far less than the cost of a complete tandem drive rebuild after gear disintegration.
Keep the gear oil clean and at the proper level – low oil is a primary cause of gear failure.
When replacing, also change the gear oil and install a new magnetic drain plug to capture any remaining debris.
The 800370327 Output Gear is stocked in XCMG regional distribution centers: 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 (5+ gears) can be shipped via sea freight with volume discounts. Each gear is individually wrapped in rust‑inhibiting paper and packed in a wooden crate to prevent damage.
For large mining or road construction fleets, XCMG offers consignment stock programs – gears are stored on‑site and billed as used, eliminating ordering delays.
Don’t let a broken output gear stop your grader in the middle of a project. The genuine XCMG 800370327 delivers reliable power transmission and long service life.
Order today and keep your XCMG motor grader’s final drive in peak condition.
Upgrade your motor grader’s drivetrain reliability with the XCMG 800370327 Output Gear – engineered for strength, precision, and durability. Choose genuine XCMG for the confidence that every gear tooth will endure extreme loads.
Order the 800370327 now and experience the quality that keeps XCMG graders moving forward.
