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Sinotruk HOWO Truck Parts Differential Assembly WG7117328025 QT385D1-2403000 81.35107.6014
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The three part numbers — WG7117328025, QT385D1-2403000, and 81.35107.6014 — refer to interchangeable or complementary components within the rear axle differential system of heavy trucks. These may include:
Differential cover (housing end cap)
Complete inter-wheel differential assembly
Axle driving head repair kit (including spider gears, side gears, thrust washers, etc.)
This system enables smooth power distribution between left and right wheels during cornering while maintaining traction and stability under full load.
| Attribute | Description |
|---|---|
| Part Name(s) | - Inter-Wheel Differential Assembly - Differential Cover (Housing End Cap) - Axle Driving Head Repair Kit / Spider Gear Set |
| OEM Part Numbers | WG7117328025, QT385D1-2403000, 81.35107.6014 |
| Alternative References | DT Spare Parts: 3.60700; AZ9231320741; 81.35600.6261 |
| Type | Drivetrain Component – Final Drive System |
| Function | Allows speed differentiation between left/right wheels during turns; transmits torque from pinion gear to half-shafts |
| Application | Rear Axles in Heavy-Duty Trucks, Tractors, Dumpers, and Construction Vehicles |
| Genuine Part | Yes – OEM or OE-Spec Replacement |
| Quality Standard | Complies with IATF 16949, GB/T standards, MAN technical specifications |
| Origin | China (SINOTRUK/Shacman), with design influence from MAN technology |
| Parameter | Value |
|---|---|
| Component Type | Spiral Bevel Gear Differential (Open or Limited-Slip variants possible) |
| Main Components Included | - Ring Gear (mounted on carrier) - Pinion Gear (input from driveshaft via hypoid mesh) - Spider (Cross Shaft) - Side Gears (connected to axle shafts) - Planetary Gears (differential gears) - Thrust Washers - Bearings and Seals (in some complete kits) |
| Material | High-Strength Alloy Steel (e.g., 20CrMnTi, case-hardened and precision-ground) |
| Manufacturing Process | Forging + CNC Machining + Heat Treatment (carburizing/quenching) |
| Gear Type | Hypoid Spiral Bevel Gears (for MCY13 platform) |
| Gear Ratio Compatibility | Designed for MCY13 single-reduction axle (common ratios: 3.7–5.9) |
| Lubrication Requirement | GL-5 Heavy-Duty Gear Oil (typically 85W-140 or synthetic equivalent) |
| Oil Capacity (System) | ~12–18 liters (depends on axle housing) |
| Sealing Method | Rubber gasket or metal-composite seal between cover and housing |
| Weight | - Differential Cover: ~15–25 kg - Full Assembly/Kit: ~40–60 kg |
| Surface Finish | Anti-rust coated or painted; machined sealing surfaces |
Note:
WG7117328025 typically refers to the differential cover/housing cap.
QT385D1-2403000 often denotes the complete differential gear assembly.
81.35107.6014 is a MAN-originated reference number, indicating compatibility with MAN TGX/TGS and SITRAK C7H models using licensed MAN technology.
Designed primarily for Chinese-made heavy-duty trucks utilizing MCY13-type single-reduction drive axles with MAN-derived engineering.
SITRAK C7H (MAN-based high-end model)
HOWO Series
HOWO A7
HOWO T7H
All models equipped with MCY13 bridge
F2000
F3000
X3000 Series
Compatible variants with MCY13 or similar axle configuration
MAN TGX / TGS (some configurations)
81.35107.6014 is an original MAN spare part number, used in Europe and exported systems
✅ Axle System: Primarily designed for MCY13 Single-Stage Reduction Drive Axle, widely used in long-haul and high-efficiency transport applications.
Smooth Cornering Performance: Enables automatic speed adjustment between left and right wheels, reducing tire scrub and improving handling.
High Torque Transmission: Built to handle peak torques exceeding 20,000 Nm in heavy-load conditions.
Enhanced Durability: Case-hardened gears resist wear and pitting even after prolonged use.
Low Noise Operation: Precision-meshed spiral bevel gears reduce gear whine and vibration.
Improved Efficiency: Optimized gear design minimizes friction losses, contributing to better fuel economy.
Reliable Under Extreme Loads: Suitable for mining, construction, over-road freight, and off-highway operations.
Easy Maintenance Access: Removable differential cover allows inspection and servicing without disassembling entire axle.
These numbers are often cross-listed across manufacturers due to shared platforms and licensing agreements.
| Brand | Part Number | Notes |
|---|---|---|
| SINOTRUK / HOWO | WG7117328025 | Commonly refers to differential cover |
| SINOTRUK / Shacman | QT385D1-2403000 | Refers to differential assembly or repair kit |
| MAN Original Equipment | 81.35107.6014 | Genuine MAN part; used in SITRAK and export models |
| DT Spare Parts | 3.60700 | Aftermarket replacement for 81.35107.6014 |
| Other References | AZ9231320741, 81.35600.6261 | Related axle/differential components |
Search Tips: Use keywords like "MCY13 differential assembly", "WG7117328025 cover", "81.35107.6014 spider gear set", or "QT385D1-2403000 repair kit" when sourcing online.
Due to its precision mechanical nature, proper installation is critical for performance and safety.
→ Must be installed by trained technicians familiar with axle gear setup, backlash measurement, and bearing preload adjustment.
→ Ring and pinion gear clearance must be adjusted to manufacturer specs (typically 0.15–0.25 mm) using shims or adjustable spacers.
→ Pinion bearing preload must be set precisely (via crush sleeve or shim pack) to prevent premature failure.
→ Always replace the differential cover gasket. Apply anaerobic sealant (e.g., Loctite 518) if required by OEM guidelines.
→ Tighten all bolts (cover, mounting brackets) to specified torque values:
Cover bolts: 80–120 Nm (follow crisscross pattern)
Pinion nut: As per manual (may require special tool)
→ Use GL-5 85W-140 or synthetic equivalent. Confirm oil level via fill plug — do not overfill or underfill.
→ After installation, run the vehicle at low speed for first 50 km, then recheck oil level and listen for abnormal noises.
→ Inspect around the differential cover, input shaft seal, and vent after operation.
→ Check every 10,000–20,000 km:
Oil level and contamination (metal particles indicate wear)
Signs of leakage
Unusual noise (whining = gear misalignment; grinding = bearing failure)
→ Exceeding GVWR increases stress on gears and bearings — adhere to payload limits.
→ The suffixes and numbering (e.g., 81.35107.6014 vs 81.35600.6261) may indicate differences in gear ratio, flange type, or brake integration — verify compatibility before purchase.
Long-Haul Freight Transport
Mining & Quarry Operations
Construction Sites
Heavy Cargo & Oversized Load Hauling
Cold Climate Regions (arctic winter grades recommended)
Dusty & Corrosive Conditions (deserts, coastal areas)
Packaging:
Differential Cover: Cardboard box with foam protection
Full Assembly/Kit: Wooden crate or reinforced carton
Labeling: Includes part number, barcode, production batch, handling instructions
Warranty: Typically 12 months against manufacturing defects (excludes improper installation or misuse)
Supply Chain: Available through SINOTRUK, Shacman, MAN dealerships, and global industrial spare parts networks
The differential components referenced by WG7117328025, QT385D1-2403000, and 81.35107.6014 are core elements of modern heavy-duty truck drivetrains, ensuring reliable torque distribution, driving stability, and durability under extreme loads.
Used across SINOTRUK SITRAK/HOWO, Shacman X3000, and MAN-based platforms, these parts represent a blend of Chinese mass production efficiency and European engineering precision.
