The genuine XCMG 800362716 Worm Gearbox Worm Shaft (Spare Part) is a high‑precision, case‑hardened power transmission component designed for motor grader circle rotation gearboxes and steering actuators. This OEM 800362716 worm shaft features a multi‑start ground thread profile, superfinished bearing journals, and a splined input end for hydraulic motor or manual crank connection. Manufactured from carburizing alloy steel (20MnCr5) with a surface hardness of 58‑62 HRC, the XCMG worm shaft delivers smooth, efficient torque transfer and self‑locking capability essential for maintaining blade position under load. The 800362716 worm shaft is a direct replacement for worn or damaged shafts in XCMG GR135, GR165, GR180, GR215, GR260, GR300, and GR350 motor graders.
This worm shaft mates with the matching worm gear (part number 800362718) inside the circle drive housing. It converts high‑speed, low‑torque input into low‑speed, high‑torque output to rotate the blade circle precisely. A worn or pitted worm shaft causes backlash, erratic circle movement, and accelerated wear of the bronze gear. Replacing with genuine XCMG 800362716 restores original gear mesh geometry, eliminates play, and extends circle drive service life.
The 800362716 worm shaft is also used in articulation steering gearboxes and blade pitch actuators. Its high lead angle ensures efficient power transfer while maintaining the self‑locking property required to prevent blade drift during grading.
| Parameter | Specification |
|---|---|
| OEM Number | 800362716 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Worm Shaft – Circle Drive / Steering Gearbox |
| Material | Case‑carburizing steel (20MnCr5 / SAE 8620), forged |
| Heat Treatment | Carburizing + quenching + tempering (case depth 0.9‑1.3 mm) |
| Surface Hardness (Tooth Flanks) | 58‑62 HRC |
| Core Hardness | 30‑38 HRC |
| Number of Thread Starts | 2 (double‑start) or 3 (triple‑start) depending on ratio |
| Module (Axial) | 4.5 (ISO metric) |
| Lead Angle (at pitch diameter) | 22°30′ (double‑start) / 28°40′ (triple‑start) |
| Overall Length | 210 mm ±0.5 mm |
| Journal Diameter (Bearing Seats) | 35 mm / 30 mm (ground to h6 tolerance) |
| Spline Data (Input End) | DIN 5480, 12 teeth, module 2, 30° pressure angle |
| Tooth Profile Accuracy | DIN 3975 Grade 6 (ground after heat treat) |
| Runout (TIR) | ≤ 0.025 mm |
| Maximum Input Torque (Continuous) | 750 Nm (5,530 lb‑in) |
| Operating Temperature Range | -40°C to +130°C (with EP gear oil) |
| Lubrication | SAE 80W‑90 or XCMG worm drive EP oil |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350 motor graders |
| Superseded Part Numbers | 800362682, 800362700, 800362708 |
The 800362716 worm shaft is the input element of the circle rotation gearbox. Connected to a hydraulic motor, it rotates and drives the worm gear, which turns the entire blade circle assembly.
Because worm drives are inherently self‑locking, the shaft prevents the blade from back‑driving under cutting loads, maintaining the set blade angle without constant hydraulic pressure.
A worn worm shaft creates excessive backlash, causing the blade to lag during angle changes and produce poor grade quality. Replacing with genuine 800362716 restores crisp, precise circle control.
Each 800362716 worm shaft is forged from 20MnCr5 steel, then CNC‑hobbed to rough thread profile. After stress relieving, it undergoes gas carburizing to create a wear‑resistant case.
Following heat treatment, the threaded section is profile‑ground on a Reishauer worm grinder to achieve DIN 3975 Grade 6 accuracy. The bearing journals are superfinished to Ra 0.2 µm for extended seal and bearing life.
XCMG performs 100% crack detection using magnetic particle inspection and tests each shaft for tooth contact pattern against a master gear. All critical dimensions are verified with a coordinate measuring machine.
To replace a worn worm shaft, drain the gearbox oil and remove the housing cover. Extract the old shaft using a puller. Clean the housing and inspect bearings for damage.
Press new tapered roller bearings onto the 800362716 shaft. Apply anti‑seize to the splines. Insert the shaft, aligning the worm with the gear. Adjust axial preload to 0.05‑0.10 mm endplay.
Check tooth contact using Prussian blue; adjust housing shims as needed. Fill with fresh EP 80W‑90 oil. Run the circle through full rotation to distribute oil before heavy use.
Excessive free play in circle rotation (more than 15 mm at blade tip), ratcheting or grinding noise during angle change, metal particles in gear oil, and visible pitting on worm threads.
If the shaft has scoring on the bearing journals or a bent input spline, replace immediately with genuine 800362716. Always replace the matching worm gear simultaneously for correct mesh.
XCMG recommends inspecting worm shaft backlash every 2,000 hours. Replace the shaft and gear at 6,000‑8,000 hours for standard grading or 4,000 hours for heavy ripping applications.
Change gearbox oil every 1,000 hours using EP 80W‑90. Contaminated oil accelerates wear on the hardened worm surface. Keep breather vents clear to prevent water ingress.
Using genuine XCMG 800362716 ensures correct case depth, thread geometry, and fatigue life. Aftermarket shafts often have poor heat treatment and fail prematurely.
Every genuine XCMG 800362716 worm shaft is backed by a 12‑month warranty. Regional warehouses in Houston, Rotterdam, Dubai, and Shanghai maintain deep stock levels.
Air freight delivery: 3‑7 business days worldwide. Emergency 24‑48 hour shipping available for critical repairs. Bulk orders receive volume discounts and sea freight options.
Aftermarket worm shafts often use through‑hardened 4140 steel without a tough core, leading to tooth breakage. Genuine XCMG 800362716 uses carburized 20MnCr5 for maximum durability. Order genuine today and restore precise circle control.
Keep a spare 800362716 worm shaft in your parts inventory. A failed shaft stops all blade circle movement, shutting down grading operations. Replace proactively during scheduled circle drive overhauls.
Upgrade your motor grader’s circle drive reliability with XCMG genuine worm shafts. Precision ground, case‑hardened, and 100% inspected – order the 800362716 Worm Gearbox Worm Shaft now and experience smooth, backlash‑free circle rotation for thousands of productive hours.
