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SINOTRUK HOWO Leaf Spring Suspension System Secondary Spring Bracket WG9925522125 Limit Block Assembly / Stop Block WG9925522111
Secondary Spring Bracket WG9925522125：These high-strength cast iron or forged steel brackets are mounted on both sides of the vehicle frame rails; when the vehicle is heavily loaded and the helper leaf springs (helper springs) deform under pressure, the brackets support and make contact with the ends of the helper springs to transfer the heavy load.
Limit Block Assembly / Stop Block WG9925522111：A rubber bump stop located above the front or rear axle, near the leaf springs. Its primary function is to prevent the axle from directly striking the frame due to excessive vertical movement during severe jolts, serving to provide progressive energy absorption, cushioning, and a rigid limit on travel.
Common Scenarios for Repair and Replacement
1. Rubber block aging/cracking: Limit blocks are highly susceptible to cracking, detachment, or flattening due to prolonged exposure to heavy loads and extensive compression, or corrosion from chassis oil and grime. Once damaged, the chassis produces a heavy metallic clanking sound when the truck traverses uneven roads; in severe cases, this can lead to frame deformation.
2. Auxiliary spring bracket wear: Under heavy loads, the contact surface of the auxiliary spring bracket undergoes high-frequency, high-pressure friction against the auxiliary leaf spring. Prolonged use can cause deep grooves or even fatigue cracks to form on the bracket's contact surface; therefore, the bracket's thickness and crack status must be inspected during suspension overhauls.
SINOTRUK Heavy-Duty Truck Leaf Spring Suspension System Overhaul BOM Detailed List
| No. | Component Name | OE Part No. | Qty | Replacement Level | Remarks / Functional Description |
|---|---|---|---|---|---|
| I. Core Inspection & Limitation Components (Inquired Items) | |||||
| 1 | Secondary Spring Bracket (Helper Spring Bracket) | WG9925522125 | 2 pcs | Inspect & Replace | 1 pc each for Left and Right. Must be replaced if the contact surface is grooved or cracked. |
| 2 | Limit Block Assembly (Rubber Buffer / Bump Stop) | WG9925522111 | 2 pcs | Mandatory | Rubber parts easily age and crack; direct replacement is highly recommended during a suspension overhaul. |
| II. Main & Secondary Leaf Spring Assemblies (Core Load-Bearing Components) | |||||
| 3 | Rear Leaf Spring Assembly (Main + Helper Leafs) | AZ9925522113 (Depends on Spec) | 2 sets | Inspect & Replace | Check for single-leaf cracks or overall fatigue sagging. Left and right ride heights must be equal. |
| 4 | Secondary Leaf Spring Assembly (Helper Leaf Only) | AZ9925522115 (Depends on Spec) | 2 sets | Inspect & Replace | The leaf spring group that directly makes contact with the helper spring bracket WG9925522125. |
| III. Fastening & Locking System (Critical for Heavy-Duty Safety - Replacement highly recommended) | |||||
| 5 | U-Bolt (Leaf Spring Anchor Bolt) | WG9114520232 (Depends on Size) | 4 pcs | Highly Recommended | Core suspension fasteners. Threads stretch and deform under heavy loads; reuse after removal is not recommended. |
| 6 | Heavy-Duty High-Strength Nut for U-Bolt | WG9112520005 | 8 pcs | Highly Recommended | Must be paired with new U-bolts; uses original factory high-strength grade. |
DETAILS
| DESCRIPTION |
Secondary Spring Bracket Limit Block Assembly / Stop Block |
PART NUMBER |
WG9925522125 WG9925522111 |
| WEIGHT | 6kg | VOLUME | 260 × 130 × 165 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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