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SINOTRUK HOWO SITRAK Continental Rear Axle Air Suspension Air Bellows Assembly WG9925528010
It is a core component of the air suspension system for heavy-duty truck chassis, primarily serving as a replacement for traditional leaf springs. It utilizes the elasticity of internal compressed air to support the vehicle's weight and absorb road shocks, while working in conjunction with a height control valve to automatically adjust the vehicle's ride height; it is commonly found on high-efficiency long-haul logistics vehicles.
Recommendations for Routine Inspection and Service Life Extension
1. Regular Draining to Prevent Oil Contamination: Air suspension systems are highly vulnerable to contamination by oil and moisture. If the truck's air dryer cartridge fails, accumulated water and engine oil (leaking from the air compressor) can enter the air bellows. This causes the internal rubber layer to soften, bulge, and eventually leak.
2. Chassis Cleaning to Prevent Sand/Gravel Damage: After driving through sites where sand or gravel is unloaded, promptly clear away any debris accumulated on the lower mounting base of the air bellows. Otherwise, the repeated compression and expansion of the bellows will cause the lower rubber section to rub against the accumulated grit, leading to rapid wear and cracking of the outer rubber layer.
MAN Technology Rear Axle Air Suspension System Overhaul BOM Details
| No. | Part Number | Description | Standard Qty | Function & Replacement Notes |
|---|---|---|---|---|
| 1 | WG9925528010 | Rear Axle Air Suspension Bellows Assembly | 2 or 4 pcs | Core Mandatory Item; 2 pcs for 4×2 models, 4 pcs for 6×4 models. Provides pneumatic load bearing and shock absorption. Replacement in pairs per axle is highly recommended. |
| 2 | WG9925520120 / WN014201 | Chassis Height Control Valve (Leveling Valve) | 1 - 2 pcs | Core Control Component; Detects axle load to automatically inflate/deflate the bellows. If its mechanical linkage is worn or the internal valve core is seized, it can easily over-inflate and blow out the new air bellows. |
| 3 | WG9925520261 (Ref) | Rear Axle Double-Acting Hydraulic Shock Absorber | 2 - 4 pcs | Recommended Replacement; Air bellows do not have an anti-rebound function. If the shock absorber leaks oil and fails, violent axle bouncing will instantly over-extend or rupture the new bellows. |
| 4 | Standard VOSS / MAN Spec | Air Line Quick-Connect Fitting Kit (Φ12/Φ10) | 1 set | Mandatory Replacement; Connects the air lines to the top cap of the bellows. Since internal seals deform after disassembly, replacing them is necessary to prevent slow air leaks. |
| 5 | WG9925520123 (Ref) | Height Valve Adjustable Linkage Assembly | 1 - 2 pcs | Inspection Item; Connects the axle to the leveling valve. Excessive play in the ball joints leads to inaccurate ride height data and causes vehicle leaning. |
| 6 | Q151B1660 / Q341B16 | High-Strength Fastening Bolt & Nut Kit for Bellows Base | 1 set | Recommended Replacement; Chassis components are constantly exposed to rain and mud. Fasteners are often stripped or rusted tightly during disassembly; replacing them ensures structural integrity. |
DETAILS
| DESCRIPTION | Rear Axle Air Suspension Air Bellows Assembly | PART NUMBER | WG9925528010 |
| WEIGHT | 10kg | VOLUME | 260 mm × 260 mm × 330 mm |
| 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 | CHASSIS |
| PACKAGE | Carton/Woodenbox | PORT OF LANDING | Qingdao Port,China |
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