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SINOTRUK HOWO T7H,TX,A7,NX Rear Leaf Spring Assembly WG9725520789
Multi-leaf springs must maintain perfect longitudinal alignment. If visual inspection reveals lateral misalignment (fanning out) of certain leaves, it indicates that the center locating bolt has snapped or the U-bolts are loose. In such cases, the vehicle must be taken out of service immediately for inspection; otherwise, individual leaves are highly likely to fracture.
If the internal rubber or bimetallic bushings (WG9000520078) are found to be deformed by compression, exposing copper, or exhibiting significant play, they should be replaced promptly.
Signs Indicating the Need for Replacement
1. Cracking or breakage of one or more leaves: Visual inspection reveals transverse cracks or a complete break in any of the steel leaves.
2. Noticeable vehicle leaning (left or right): The arch heights of the leaf springs on either side are inconsistent. Measure the distance from the rear axle to the frame; if the drop on one side exceeds the manufacturer's specifications, it indicates severe fatigue or loss of elasticity in the leaf springs.
3. Heavy metallic clanking sounds on bumpy roads: Usually caused by broken leaf springs rubbing or striking against each other, or by the complete failure of locating pins or U-bolts.
Rear Leaf Spring Suspension System Maintenance & Replacement BOM Detail
| Module Category | SINOTRUK Genuine Part No. | Part Description (EN) | Std. Qty | Maintenance / Replacement Remarks & Suggestions |
|---|---|---|---|---|
| Core Loading Component | WG9725520789 | Rear Leaf Spring Assembly | 2 | Main Item & Mandatory: Genuine 11/12-leaf heavy-duty multi-leaf spring. Highly recommended to replace in pairs (left & right) to prevent vehicle tilting or steering pull. |
| Primary Fasteners | AZ9125520268 (Ref Series) | Rear Axle Suspension U-Bolt | 4 | Mandatory Renewal: Ultimate heavy-duty fastener locking the leaf spring pack to the axle housing. Highly prone to severe rust; must be replaced with the spring. |
| Locking Hardware | Q341B30 / WG9000320435 | Heavy-Duty Hexagon Lock Nut | 8 | Mandatory Renewal: High-tensile self-locking nuts. Must be tightened to the factory-specified torque using heavy-duty pneumatic impact wrenches. |
| Locating & Guiding | 199000520006 | Leaf Spring Guide Pin / Guide Bolt | 2 - 4 | Recommended: Stepped limit pin. Prevents individual leaves from shifting forward/backward or fanning out under sudden longitudinal impact. |
| Bushing & Sleeve | WG9000520078 | Leaf Spring Bushing / Sleeve | 2 - 4 | Mandatory Renewal: Press-fitted into both spring eyes. Bears extreme chassis loads; old bushings are usually deformed, squashed, or worn out. |
| Structural Support | AZ9925520008 (Ref) | Leaf Spring Seat / Saddle | 2 | Replace as Needed: Cast steel base supporting the leaf springs. Inspect the central alignment hole; replace the seat if the hole has been enlarged or ovalized. |
| Lubrication Port | 190003963115 / Q700B01 | Straight Grease Nipple (M10×1) | 2 - 4 | Recommended: Screwed into the bracket exterior. Clogged or damaged fittings should be replaced to facilitate routine greasing maintenance later. |
| Consumable | No. 2 or No. 3 Universal | Heavy-Duty Extreme Pressure Lithium Grease | 2 Cans | Mandatory Material: Apply thoroughly between leaf gaps and onto the pin/bushing mating surfaces during assembly, and pump fully after installation. |
DETAILS
| DESCRIPTION | Rear Leaf Spring Assembly | PART NUMBER | WG9725520789 |
| WEIGHT | 100kg | VOLUME | 175 cm × 95 cm × 75 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 | CHASSIS |
| PACKAGE | Carton/Woodenbox | PORT OF LANDING | Qingdao Port,China |
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