SINOTRUK HOWO AC16 AZ9981320136 Inter-Axle Differential Assembly Truck Parts Hot Sale
No.:
Vehicle Type: Sinotruk Truck Parts
Brand Name: SINOTRUK
Person in charge: William Du
Cel: 8619050562894
Whatsapp: 8619050562894
E-mail: sales22@chinatruck.cc
FREE GET QUOTE
Details
Premium AZ9981320136 AC16 Inter-Axle Differential Assembly for SINOTRUK Heavy Duty Trucks
1. Product Description
In heavy-duty 6x4 and 8x4 multi-axle logistics transport and harsh mining operations, torque distribution between driving axles is the foundational element of vehicle traction and driveline protection. The AZ9981320136 Inter-Axle Differential Assembly serves as the core power-splitting component within the SINOTRUK AC16 heavy cast steel reduction axle. Positioned inside the through-drive axle housing, it dynamically balances the rotational speed differences between the middle and rear driving axles, preventing driveline wind-up while delivering continuous high torque.
When heavy tippers encounter muddy construction zones or steep grades, the inter-axle differential works in tandem with the pneumatic differential lock. If the lubrication film drops, or if the driver fails to disengage the diff-lock when returning to high-traction asphalt pavement, catastrophic mechanical failures will trigger rapidly:
Ablation & Sintering of Cross Shafts: Prolonged wheel slip under heavy loads causes the internal spider gears to spin at extreme relative speeds. Without adequate oil splashing, temperatures spike instantly, fusing the copper thrust washers and spider gears to the cross shaft.
Gear Tooth Stripping and Fracture: High impact shock loads or driving with a locked inter-axle differential on hard surfaces introduces severe twisting stress, snapping the precision-machined side gear teeth.
Casing Cracking & Driveline Seizure: Loose gear fragments or broken shims migrate into the main gear mesh, jamming the gear train and fracturing the differential housing, which instantly paralyzes the truck's powertrain.
Commercial Operation Risk: An inter-axle differential breakdown locks up the entire rear tandem assembly, leaving loaded commercial vehicles stranded mid-route. For heavy truck fleets, this translates into expensive heavy-recovery towing fees, severe cargo delays, and cascade damage to the input input shafts and main through-drive gear sets.
2. Technical Parameters
| Item | Specification / Engineering Reality |
| Part Number | AZ9981320136 / AZ9981320136-OEM |
| Product Name | Inter-Axle Differential Assembly (轴间差速器总成) |
| Axle Platform | SINOTRUK AC16 Heavy Duty Cast Steel Engineering Axle |
| Application Vehicles | HOWO 7, HOWO T7H, HOWO TX, SITRAK C7H, HOHAN Mining Tippers |
| System Category | Truck Chassis Transmission & Drive System |
| Internal Components | 1x Housing Block, 1x Spider Cross Shaft, 4x Planetary Gears, 2x Side Gears |
| Material Composition | 20CrMnTi Alloy Steel (Gears) / QT600-3 Ductile Iron (Housing Case) |
| Heat Treatment | Deep Case-Hardened Carburizing & Quenching (HRC58-62 Surface Hardness) |
| Thrust Washer Spec | High-Wear-Resistance Sintered Copper-Lead Alloy Washers |
| Quality Tier | Original Equipment Manufacturer (OEM) Quality / Genuine Supply |
| Stock Status | In Stock / Bulk Wholesale Ready (现货底盘配件大库批发) |
3. Fitment & Axle Verification — 100% Match Guarantee
Axle & Vehicle Compatibility Chart
SINOTRUK HOWO Series: HOWO 6x4 Dump Trucks (336hp, 371hp, 380hp, 420hp) fitted with AC16 or HC16 heavy-duty tandem hub reduction axles.
SINOTRUK SITRAK Series: Heavy-duty engineering tippers and specialized mixers utilizing cast steel reduction axle housings.
Mining Dump Trucks: Sany, L king, and generic wide-body mining trucks utilizing adapted SINOTRUK transmission and rear axle platforms.
Critical Sourcing Validation
Because SINOTRUK manufactures multiple heavy-duty axles (such as the single-reduction MCY13/MCY16 series and the hub-reduction HC16/AC16 series), the internal differential units vary completely in spline count and gear profiles. To avoid ordering the wrong part:
Axle Data Tag Verification: Check the metal plate riveted to the rear axle housing to confirm the axle model is AC16 or HC16.
17-Digit Vehicle VIN: Provide your full chassis VIN code (starting with LZZ...) so our parts managers can cross-match the digital electronic factory catalog (EPC).
Spline Count Match: Confirm the internal spline tooth count on the side gear to match your original input/through-shaft profile.
4. Smart Sourcing & Maintenance Guide
Table A: Symptom Recognition — Driveline Noise vs. Differential Failure
(For Fleet Maintenance Workshops & Heavy Truck Mechanics)
| Truck Operating Condition | What the Chassis Does (Symptom) | Technical Root Cause | Corrective Maintenance Action |
| Normal Straight-Line Haul | Smooth running with standard transmission hum; no abnormal clunking when shifting. | Planetary gears remain stationary relative to the cross shaft; oil level is adequate. | Routine Care: Change heavy duty gear oil regularly (85W-90 GL-5) to flush metal debris. |
| Turning or Cornering | Severe rhythmic metallic knocking or grinding sounds radiating from the intermediate axle. | Spider Gear Ablation: Internal planetary gears are binding or seized onto the cross shaft due to oil starvation. | Inspect Immediately: Teardown the carrier assembly to check gear teeth before a complete axle lockup occurs. |
| Clutch Engagement | Heavy mechanical clunking or dead-play backlash felt under the chassis during initial takeoff. | Excessive Washer Wear: The internal copper thrust washers are completely worn thin, creating excessive gear clearance gap. | Overhaul Required: Replace the differential assembly or install a complete internal gear repair kit to prevent teeth stripping. |
Table B: Low-Cost Counterfeit Copies vs. Our Original Factory Quality
(For International Importers, Distributors & Regional Fleet Sourcing Officers)
| Engineering Indicator | Cheap Aftermarket Imitation Copies | Our Premium OEM Wholesale Quality | Commercial & Business Impact |
| Gear Material & Forging | Low-grade carbon steel using cast blanks or basic machining; poor grain structure. | Premium 20CrMnTi Alloy Steel, multi-directional die-forged for high grain refinement. | Provides exceptional fatigue resistance, handling sudden 50+ ton heavy haul torque surges. |
| Surface Hardness | Superficial induction hardening; thin hard layer with a soft brittle core structure. | Full deep carburization and gas quenching, maintaining stable internal core toughness. | Eliminates tooth pitting, edge chipping, and premature gear wear under long-distance haulage. |
| Thrust Washers | Cheap brass shims or soft composite plastics that flatten out rapidly under load. | Imported high-lead sintered copper alloy shims with grooved oil-retaining channels. | Prevents high-speed friction scoring and seizing of planetary gears during differential actions. |
5. Supply Chain Risk Control & Logistics Management
Integrated Multi-System Export Sourcing: We consolidate complete vehicle replacement packages—including Chassis components (diff assemblies, steering gears, brake drums), Engine parts (Weichai/Sinotruk pistons, liners, turbochargers), and Cabin assemblies (HOWO faceplates, cabin suspension air bags, bumpers) into single shipments, reducing customs and freight overhead.
Anti-Corrosion Rust Prevention Coating: Differential assemblies are thoroughly washed in anti-rust fluid, coated with heavy wax film, and sealed within airtight VCI moisture-barrier polymer packaging to withstand ocean cargo hold humidity.
High-Impact Protective Crating: Shipped inside heavy-duty, reinforced individual composite wooden boxes or high-strength molded styrofoam inserts to ensure zero gear tooth or casing damage during multi-port port transit.
6. Comprehensive Parts Supply Platform Strategy —— One-Stop Purchasing
| System Category | Essential Associated Fleet Spare Parts | Strategic Co-Buying Profit Advantage |
| 1. Chassis & Axle System | • Main Reducer Spiral Bevel Gear Set (Crown Wheel & Pinion) • Through-Drive Input Shaft & Output Drive Gears • AC16 Hub Reduction Planetary Carrier Gear Sets | Eradicate Secondary Assembly Failure: Replacing a failed differential alongside worn ring & pinion gears ensures proper tooth contact patterns and long-term rear-end quietness. |
| 2. Engine & Drivetrain | • Weichai WP10 / WP12 / WD615 Engine Overhaul Kits • Heavy Duty Twin-Countershaft Fast Gearbox Components • Clutch Cover Assembly & 430mm Friction Discs | Minimize Fleet Port Downtime: Consolidate heavy powertrain mechanical spares with axle components to optimize shipping container space usage. |
| 3. Cabin & Accessories | • HOWO7/TX Cabin Shell Assemblies & Exterior Body Panel Trim • Air Conditioning Compressors & Electrical Control Modules • Air Suspension Leveling Valves & Cabin Shocks | Elevate Local Resale Valuation: Importing clean body styling parts alongside heavy mechanical drive components helps local workshops restore fleet trucks completely. |
Contact Information
Senior Export Sales Director: William Du
One-Stop Platform Supply: Chinatruck.cc (Specialized Exports for SINOTRUK, SHACMAN, FAW, FOTON Components)
WhatsApp / WeChat: +86 19050562894 (Available 24/7 for technical configuration checking & fast commercial pricing)
Business Email: Sales22@chinatruck.cc
FREE Inquiry Now
If you have any questions, feedback or comments, please fill out the form below and we will reply you back as soon as possible.
