

The Sitrak Truck C7 Dual-Lock Air Suspension Left Seat Assembly is a complete, high-performance driver seat system engineered for Sinotruk Sitrak C7 series trucks, offering unparalleled comfort, safety, and durability for professional drivers. This comprehensive assembly features advanced dual-lock air suspension technology that provides exceptional vibration isolation and stability across diverse road conditions. As a key component within the extensive catalog of Sinotruk Sitrak parts, it is designed to integrate seamlessly with C7 cabin architecture.
The Sitrak Truck C7 Dual-Lock Air Suspension Left Seat Assembly is a complete seating system specifically designed for the driver’s position in Sinotruk Sitrak C7 series trucks. This assembly incorporates dual-lock air suspension technology that allows for precise height adjustment and excellent shock absorption, significantly reducing driver fatigue during long-haul operations. The system includes multiple sophisticated components such as X-type bracket welding assemblies, nylon bearings, rubber buffer blocks, air springs (bellows), dampers, height valve assemblies, and various adjustment mechanisms for seat angle, lumbar support, and armrest positioning.
This assembly features an integrated alarm-equipped seatbelt system that enhances safety by alerting drivers when the belt is not properly fastened. The seat includes multiple comfort and adjustment features such as adjustable lumbar support via side bolster airbags, seat cushion tilt adjustment, backrest angle adjustment with a dedicated handle, and integrated left and right armrests. The construction utilizes high-quality materials including metal components with anti-corrosion treatments, durable polymers for bearings and sliders, reinforced welding assemblies for structural integrity, and premium upholstery materials for the seat and backrest covers. Every component is engineered to work together seamlessly, creating a synchronized system that responds intuitively to driver adjustments.
The Sitrak Truck C7 Dual-Lock Air Suspension Left Seat Assembly offers exceptional customization through its multiple adjustment points. Drivers can modify seat height via the air suspension system, adjust seat cushion angle using the tilt mechanism, modify backrest angle through the recliner assembly, and customize lumbar support through the integrated air bladder system. The assembly includes comprehensive mounting hardware, cable controls, and pneumatic components that ensure smooth operation and reliable performance. With its modular design, maintenance and part replacement are simplified, as individual components can be accessed and replaced without requiring complete seat disassembly, reducing downtime and maintenance costs.
Engineered specifically for commercial truck applications, this seat assembly withstands the rigorous demands of daily professional use. The dual-lock mechanism provides exceptional stability during vehicle maneuvers, preventing unwanted seat movement while allowing for smooth adjustment when needed. The comprehensive component list includes everything from structural frames and mounting brackets to adjustment handles, decorative covers, and fastening hardware, ensuring a complete installation package. This assembly represents Sinotruk Sitrak’s commitment to driver comfort and safety, offering a premium seating solution that enhances the overall driving experience in C7 series trucks.
| No. | Part Number | Part Name English | Quantity |
|---|---|---|---|
| 1 | WG1662511105 | Left Seat X-Type Bracket Welding Assembly I | 1 |
| 2 | WG1662511111 | Left Seat X-Type Bracket Welding Assembly II | 1 |
| 3 | WG1662511124 | Inner and Outer Bracket Connecting Bolt | 2 |
| 4 | WG1662510989 | Metal Non-Lubricated Bush I | 4 |
| 5 | Q33210 | Type 2 All-Metal Hex Lock Nut | 2 |
| 6 | WG1662511116 | Slider I | 2 |
| 7 | WG1662511116 | Slider I | 2 |
| 8 | Q218B0840 | Hexagon Socket Head Cap Screw | 2 |
| 9 | Q33208 | Type 2 All-Metal Hex Lock Nut | 2 |
| 10 | Q33208 | Type 2 All-Metal Hex Lock Nut | 2 |
| 11 | Q33208 | Type 2 All-Metal Hex Lock Nut | 2 |
| 12 | Q33208 | Type 2 All-Metal Hex Lock Nut | 2 |
| 13 | WG1662511125 | Nylon Bearing | 2 |
| 14 | WG1662511125 | Nylon Bearing | 2 |
| 15 | WG1662511133 | Inner Limit Block Assembly | 2 |
| 16 | WG1662511932 | Hexagon Socket Head Cap Screw (II) | 2 |
| 17 | WG1662511150 | Rubber Buffer Block | 2 |
| 18 | WG1662511163 | Limit Belt Mounting Plate | 1 |
| 19 | Q40308 | Spring Washer | 1 |
| 20 | Q40308 | Spring Washer | 4 |
| 21 | Q40308 | Spring Washer | 4 |
| 22 | WG1662511931 | Hexagon Socket Head Cap Screw (Ⅰ) | 1 |
| 23 | WG1662511931 | Hexagon Socket Head Cap Screw (Ⅰ) | 2 |
| 24 | WG1662511931 | Hexagon Socket Head Cap Screw (Ⅰ) | 4 |
| 25 | WG1662511134 | Upper Frame Assembly | 1 |
| 26 | WG1662510160 | Limit Bracket Assembly | 1 |
| 27 | WG1662510142 | Oval Head Bolt | 2 |
| 28 | WG1662510143 | Inner Limit Block II | 2 |
| 29 | Q2725513F31 | Cross Recessed Pan Head Self-Tapping Screw | 2 |
| 30 | WG1662511132 | Air Spring (Bellows) | 1 |
| 31 | WG1662511921 | Plastic-Tightening Screw 80*16 | 2 |
| 32 | WG1662511127 | Damper Assembly | 1 |
| 33 | WG1662511131 | Bolt (for Damper Installation) | 1 |
| 34 | Q40208 | Large Washer | 1 |
| 35 | WG1662511950 | Rotating Plate Welding Assembly | 1 |
| 36 | Q43635 | Open Retaining Ring | 1 |
| 37 | WG1662511955 | Push-Pull Cable | 1 |
| 38 | WG1662511211 | Cable V | 1 |
| 39 | Q43640 | Open Retaining Ring | 1 |
| 40 | Q43640 | Open Retaining Ring | 2 |
| 41 | Q43640 | Open Retaining Ring | 4 |
| 42 | Q43640 | Open Retaining Ring | 3 |
| 43 | Q43640 | Open Retaining Ring | 2 |
| 44 | Q43640 | Open Retaining Ring | 1 |
| 45 | WG1662512139 | C7 Seat Height Valve Assembly | 1 |
| 46 | Q2140512 | Cross Recessed Pan Head Screw | 3 |
| 47 | Q40205 | Large Washer | 3 |
| 48 | WG1662511598 | Belt Fixing Shaft | 1 |
| 49 | WG1662511201 | Seat Frame Welding Assembly | 1 |
| 50 | WG1662511925 | Limit Block | 2 |
| 51 | WG1662510229 | Frame Fixing Shaft Assembly | 2 |
| 52 | Q4400413719 | Open Type Flat Round Head Blind Rivet | 2 |
| 53 | Q4400413719 | Open Type Flat Round Head Blind Rivet | 4 |
| 54 | WG1662511152 | Seat Cushion Tilt Adjuster Outer Frame | 1 |
| 55 | WG1662511153 | Seat Cushion Tilt Adjuster Outer Frame Cover | 1 |
| 56 | WG1662511154 | Spring | 2 |
| 57 | WG1662511155 | Locking Plate | 2 |
| 58 | WG1662511156 | Rotating Wheel I | 2 |
| 59 | WG1662511157 | Cable IV | 1 |
| 60 | WG1662511158 | Guide Block | 2 |
| 61 | WG1662510220 | Seat Cushion Fixing Slider | 4 |
| 62 | Q4404825719 | Open Type Flat Round Head Blind Rivet | 4 |
| 63 | WG1662511207 | Right Locking Small Torsion Spring | 1 |
| 64 | WG1662510225 | Left Locking Small Torsion Spring | 1 |
| 65 | Q40206 | Large Washer | 2 |
| 66 | Q2140612 | Cross Recessed Pan Head Screw | 2 |
| 67 | WG1662510235 | Left Cable Fixing Bracket | 1 |
| 68 | WG1662510236 | Right Cable Fixing Bracket | 1 |
| 69 | WG1662510234 | Cable VI | 1 |
| 70 | WG1662510237 | Cable VII | 1 |
| 71 | WG1662511208 | Left Handle Assembly | 1 |
| 72 | Q2724219 | Cross Recessed Pan Head Self-Tapping Screw | 3 |
| 73 | WG1662511209 | Cable II | 1 |
| 74 | WG1662511210 | Cable III | 1 |
| 75 | WG1662511912 | Cable Fixing Clip II | 3 |
| 76 | WG1662511162 | Seat Limit Belt | 1 |
| 77 | WG1662511599 | Rubber Protective Sleeve | 1 |
| 78 | WG1662511170 | Rubber Sleeve Rivet | 16 |
| 79 | WG1662512052 | Slide Rail Assembly | 1 |
| 80 | WG1662511920 | Quick-Connect Straight Through Fitting | 1 |
| 81 | WG1662511302 | Backrest Frame Welding Assembly | 1 |
| 82 | WG1662511307 | Backrest Support Air Spring Assembly | 1 |
| 83 | WG1662511308 | Backrest Side Support Air Spring Assembly | 2 |
| 84 | WG1662510303 | Backrest Soft Cushion | 1 |
| 85 | WG1662510331 | Backrest Rear Decorative Cover Fixing Block | 2 |
| 86 | WG1662510333 | Left Armrest Assembly | 1 |
| 87 | WG1662510334 | Right Armrest Assembly | 1 |
| 88 | Q218B0820 | Hexagon Socket Head Cap Screw | 4 |
| 89 | Q218B0820 | Hexagon Socket Head Cap Screw | 1 |
| 90 | Q218B0820 | Hexagon Socket Head Cap Screw | 2 |
| 91 | WG1662510330 | Backrest Rear Decorative Cover | 1 |
| 92 | WG1662512147 | Seat Belt Fixing Bracket Assembly | 1 |
| 93 | WG1664560090 | Left Seat Belt Assembly (with Alarm Function) | 1 |
| 94 | Q2204213F31 | Cross Recessed Pan Head Self-Tapping Screw and Flat Washer Assembly | 2 |
| 95 | Q2204213F31 | Cross Recessed Pan Head Self-Tapping Screw and Flat Washer Assembly | 2 |
| 96 | Q2204213F31 | Cross Recessed Pan Head Self-Tapping Screw and Flat Washer Assembly | 2 |
| 97 | WG1662511923 | Seat Belt Decorative Cover | 1 |
| 98 | WG1662511924 | Seat Belt Front Decorative Cover | 1 |
| 99 | WG1662510337 | Right Torsion Spring | 1 |
| 100 | WG1662510335 | Backrest Mounting Bolt | 2 |
| 101 | WG1662511309 | Left Seat Backrest Adjustment Handle | 1 |
| 102 | WG1662511911 | Internal Tooth Retaining Ring | 2 |
| 103 | WG1662511999 | Height Valve PU Tube Fixing Clip | 1 |
| 104 | WG1662511212 | Left Seat Left Decorative Cover Plate | 1 |
| 105 | Q2724213 | Cross Recessed Pan Head Self-Tapping Screw | 1 |
| 106 | Q2724213 | Cross Recessed Pan Head Self-Tapping Screw | 1 |
| 107 | WG1662511213 | Lumbar Support Control Valve | 1 |
| 108 | Q2723595 | Cross Recessed Pan Head Self-Tapping Screw | 3 |
| 109 | WG1662511214 | Tube Fixing Bracket | 1 |
| 110 | WG1662510240 | Left Seat Rear Decorative Cover Plate | 1 |
| 111 | Q2204295F31 | Cross Recessed Pan Head Self-Tapping Screw and Flat Washer Assembly | 4 |
| 112 | WG1662511900 | Left Seat Right Decorative Cover Plate | 1 |
| 113 | WG1662511926 | Right Protective Cover Fixing Bracket | 2 |
| 114 | WG1662510241 | Left Seat Front Decorative Cover Plate | 1 |
| 115 | WG1662511403 | Seat Cushion Base Plate | 1 |
| 116 | WG1662511409 | Leaf Spring | 2 |
| 117 | WG1662510413 | Cable Fixing Plate | 1 |
| 118 | WG1662510405 | Seat Cushion Soft Pad | 1 |
| 119 | WG1662510407 | Seat Cushion Clip | 20 |
| 120 | WG1662512146 | Seat Cushion Tilt Adjustment Handle Assembly | 1 |
| 121 | Q2724216 | Cross Recessed Pan Head Self-Tapping Screw | 2 |
| 122 | WG1662511930 | Gasket | 1 |
| 123 | AZ1662511101 | Left Seat Lower Frame Welding Assembly | 1 |
| 124 | WG1662512140 | Guide Tube | 1 |
| 125 | WG1662511117 | Left Seat Backrest Recliner Assembly | 1 |
| 126 | WG1662510221 | Right Seat Backrest Recliner Assembly | 1 |
| 127 | Q4400611T19 | Open Type Flat Round Head Blind Rivet | 4 |
| 128 | Q4400406T19 | Open Type Flat Round Head Blind Rivet | 4 |
| 129 | WG1662512073 | Backrest Upholstery Assembly | 1 |
| 130 | WG1662510336 | Left Torsion Spring | 1 |
| 131 | Q4400408T19 | Open Type Flat Round Head Blind Rivet | 4 |
| 132 | WG1662512075 | Seat Cushion Upholstery Assembly | 1 |
Our Sitrak Truck C7 Dual-Lock Air Suspension Left Seat Assembly represents the highest standard of commercial vehicle seating, engineered with over 130 individual components that work together to deliver exceptional comfort, durability, and safety. Unlike partial seat repairs or generic replacements, our complete assembly ensures perfect compatibility with Sinotruk Sitrak C7 series trucks, eliminating fitment issues and providing seamless integration with existing cabin systems. The dual-lock air suspension technology offers superior vibration isolation compared to standard mechanical seats, significantly reducing driver fatigue during long-haul operations and improving overall driving performance. With comprehensive adjustment capabilities including height, tilt, lumbar support, and backrest angle, our seat assembly provides personalized comfort that adapts to individual driver preferences and body types.
The construction quality of our Sitrak Truck C7 Dual-Lock Air Suspension Left Seat Assembly exceeds industry standards, utilizing premium materials throughout all components. Structural elements like the X-type bracket welding assemblies and seat frame are manufactured from high-strength steel with anti-corrosion treatments, while moving parts incorporate durable polymers like nylon bearings and rubber buffers to ensure smooth, long-lasting operation. The integrated air spring system provides consistent support and adjustability, with reinforced bellows and precision valves that maintain performance under varying loads. Every component in our assembly undergoes rigorous quality testing before inclusion, ensuring reliable performance even in the most demanding commercial applications.
Safety features embedded in our Sitrak Truck C7 Dual-Lock Air Suspension Left Seat Assembly provide enhanced protection for professional drivers. The alarm-equipped seatbelt system promotes proper usage through auditory reminders, while the dual-lock mechanism prevents unexpected seat movement during sudden maneuvers. The comprehensive limit block system and reinforced structural components ensure the seat maintains integrity under extreme conditions. Additionally, the ergonomic design reduces strain on the driver’s body, promoting better posture and reducing the risk of musculoskeletal injuries that can result from prolonged sitting in inadequate seating positions.
Choosing our Sitrak Truck C7 Dual-Lock Air Suspension Left Seat Assembly provides exceptional long-term value through reduced maintenance requirements and extended service life. The complete assembly includes all necessary components for installation, eliminating the need to source individual parts separately. Our seat assembly is backed by Sinotruk’s reputation for quality and supported by comprehensive technical documentation and availability through authorized distribution networks.
If you have any questions about our products, services, or anything related to what we offer, please don’t hesitate to leave us a message—our dedicated team is always ready to provide prompt and helpful responses to address your concerns. What’s more, when you become our valued customer, we’re delighted to offer you complimentary catalog services, giving you access to detailed, up-to-date information on our full range of products, specifications, and offerings to help you make informed decisions.