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HOWO T7H HOWO A7 Steering Column Assembly / Steering Control Mechanism Assembly AZ9925470170 AZ9925476080
Breakdown of Core Structural Components
1. Upper Universal Joint Assembly: Connects to the main steering shaft and handles the initial change in steering angle.
2. High-Precision Telescopic Spline Shaft: Heavy-duty truck cabs typically feature air-bag suspension (four-point floating system), causing relative movement between the cab and the chassis-mounted steering gear when driving over rough terrain. The spline shaft absorbs this movement through smooth axial extension and retraction (utilizing a sliding bearing design), preventing binding or sticking during steering maneuvers.
3. Lower Universal Joint Assembly: Securely locks directly onto the input shaft of the steering gear via a splined connection featuring a locating pin bolt.
4. Pneumatic Locking Cylinder (Optional/Configuration-dependent): Some high-end, high-floor models feature a miniature cylinder on the steering column; depressing the adjustment pedal activates the pneumatic circuit, disengaging the lock to allow for steering wheel tilt adjustment.
5. Rubber Dust Boot: Encases the central telescopic spline section, preventing mud, water, sand, and debris from the chassis from entering the spline grooves.
Drive & Universal Joint Components (Rotational Core)
| No. | English Name (BOM) | Qty | Defect / Replacement Criteria |
|---|---|---|---|
| 1 | Upper Universal Joint Assembly | 1 pc | Connects to the steering wheel main shaft. Replace if clicking noises or binding occurs during steering. |
| 2 | Lower Universal Joint Assembly | 1 pc | Connects to the steering gear input shaft. Highly prone to rusting due to mud and water splash from the chassis. |
| 3 | Cross Spider & Needle Bearings | 2 sets | Core wear parts of the U-joint. Replace if loose or worn, which causes excessive steering play. |
| 4 | Slip Spline Shaft (Inner) | 1 pc | Responsible for vertical telescoping. Replace if spline teeth are worn or bent, causing the wheel to shake back and forth. |
| 5 | Spline Sleeve Tube (Outer) | 1 pc | Mates with the inner spline shaft. Must have zero rotational clearance between the teeth. |
Locking, Adjustment & Pneumatic Mechanisms (For High-Floor Cab)
| No. | English Name (BOM) | Qty | Defect / Replacement Criteria |
|---|---|---|---|
| 6 | Pneumatic Locking Cylinder | 1 pc | Releases the column lock when the foot valve is pressed. Replace if air leaks or if it fails to lock tightly. |
| 7 | Locking Plates (Toothed Jaws) | 1 set | Mechanical engagement teeth. Replace if the teeth are stripped or rounded over, causing the steering wheel to slip. |
| 8 | Return Springs | 2 pcs | Assists the column or foot pedal to automatically spring back to its original locked position. |
| 9 | Foot Control Valve Assembly | 1 pc | Located on the lower left floorboard of the cab; controls the air routing to the locking cylinder. |
DETAILS
| DESCRIPTION | Steering Column Assembly / Steering Control Mechanism Assembly | PART NUMBER | AZ9925470170 AZ9925476080 |
| WEIGHT | 15kg | VOLUME | 85 cm × 26 cm × 24 cm |
| TRUCK MOLDE | SINOTRUK | QUALITY | Copy,High Copy, OEM,Original |
| MOQ | 1 | WARRANTY | 1 year |
| PAYMENT | TT/WESTEN UNION | SHIPMENT | by air/sea/railway |
| BRAND | SINOSACHS | PLACE OF ORIGIN | JINAN CITY,CHINA |
| STOCK | IN STOCK | APPLICABLE SITE | CABIN |
| PACKAGE | Carton/Woodenbox | PORT OF LANDING | Qingdao Port,China |
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