Sany Spring Assembly-Rear Steel Plate

The Sany Spring Assembly-Rear Steel Plate is a heavy-duty multi-leaf suspension spring pack engineered for the rear axles of Sany mining dump trucks and off-highway vehicles. This 14-leaf progressive spring assembly provides the primary load-bearing and shock-absorbing functions for the tandem rear suspension system. When you need authentic replacement components, trust Sany Parts to deliver factory-original quality. The Sany Spring Assembly-Rear Steel Plate integrates 14 graduated-length leaf springs, a precision-machined bush, and is secured with high-strength fasteners, all working together to deliver progressive spring rates and exceptional fatigue resistance.

Sany Spring Assembly-Rear Steel Plate — OEM 14-leaf progressive spring pack for Sany mining truck rear tandem suspension systems

What is the Sany Spring Assembly-Rear Steel Plate?

The Sany Spring Assembly-Rear Steel Plate is a complete 14-leaf progressive spring pack that serves as the primary load-bearing element in the rear tandem suspension system of Sany heavy mining trucks.

This multi-leaf design is at the heart of Sany’s load-equalizing suspension technology, automatically distributing weight between the middle and rear axles to prevent axle overload and maintain tire contact on uneven terrain.

The assembly consists of 14 individual leaf springs of graduated lengths—from the longest main leaf to the shortest inner leaf—each precision-shaped to engage progressively as load increases.

The complete configuration is secured with high-tensile fasteners including specialized spring bolts and reinforced nuts that maintain structural integrity under extreme dynamic loads.

Product Parameters of Sany Spring Assembly-Rear Steel Plate

The Sany Spring Assembly-Rear Steel Plate is manufactured from high‑carbon spring steel (equivalent to SUP11A grade) with shot‑peened surface treatment for exceptional fatigue resistance and longevity.

Each leaf is heat‑treated to achieve an optimal microstructure of tempered martensite, and the leaf tips are tapered to reduce stress concentrations. The bush (60057036) is a precision‑machined component that provides the pivot point for spring articulation.

The complete assembly has been validated on Sany SKT series mining trucks operating in Australian iron ore mines, Chilean copper mines, and Canadian oil sands, demonstrating a field service life exceeding 12,000 operating hours.

Why Choose Our Sany Spring Assembly-Rear Steel Plate?

Complete 14-Leaf OEM Kit — Perfectly Matched Progressive Stack: The Sany Spring Assembly-Rear Steel Plate includes every leaf from the 1st to the 13th sheet, plus the precision-machined bush. This progressive leaf stack provides a spring rate that increases gradually as load rises—soft when empty to protect the chassis, stiff when fully loaded to prevent sag and ensure safe handling.

Superior Fatigue Life with Shot-Peened Surface Treatment: Every leaf in the Sany Spring Assembly-Rear Steel Plate undergoes shot-peening, which creates compressive residual stresses on the surface to resist crack initiation. Shot-peened leaf springs have been shown to endure over 500,000 full compression cycles—three times the cycle life of non-peened springs.

Precision Load Equalization for Tandem Axles: The 14-leaf progressive design is optimized for Sany’s tandem axle geometry. When the truck travels over uneven terrain, the walking beam pivot rotates and distributes load between the axles. The graduated leaf lengths ensure that the spring rates match the chassis dynamics, preventing any single axle from becoming overloaded. This reduces peak axle stresses by up to 35% compared to constant-rate springs, protecting the axle housing, wheel bearings, and tires from premature wear.

Fleet-Proven Reliability and 24‑Month Warranty: Standard on Sany SKT series mining trucks operating in over 60 countries, genuine Sany rear spring assemblies deliver an average service life exceeding 12,000 hours—three times longer than generic springs. Backed by a 24-month manufacturer’s warranty covering spring breakage and sagging, with volume pricing, consignment stock, and global technical support available for large fleets.

What are the Routine Maintenance Considerations for the Sany Spring Assembly-Rear Steel Plate?

Daily visual inspection before operation: Before each shift, inspect the Sany Spring Assembly-Rear Steel Plate for visible damage. Look for cracked leaves, broken center bolts, or any leaf that has shifted out of alignment. Check the bush (60057036) for wear or extrusion. Any cracked leaf requires immediate replacement—a single cracked leaf can lead to progressive failure of adjacent leaves within hours of operation.

No lubrication — but keep springs clean: Unlike pivot pins, leaf springs require no lubrication. In fact, oil or grease on spring leaves attracts abrasive dust that accelerates wear between leaves. Instead, clean the spring assembly monthly using a pressure washer or steam cleaner to remove packed mud and debris that could cause inter-leaf friction and fatigue cracking. After cleaning, spray the spring pack with a penetrating rust inhibitor to prevent corrosion between leaves.

U-bolt torque inspection (every 1,000 hours or semi-annually): Retorque the U-bolt nuts that clamp the spring assembly to the axle seat. Each nut must be torqued to 350‑400 Nm in a cross pattern sequence. Mark nut positions with paint after torquing for quick visual verification. A loose U-bolt is the most common cause of spring breakage—allowing the spring pack to shift, leading to cracked center bolts and uneven axle alignment.

Preventative overhaul schedule — every 8,000 hours or 4 years: For high‑use mining trucks operating more than 3,000 hours per year, Sany recommends a full spring replacement every 8,000 hours or 4 years. Replace the entire 14‑leaf pack as a set—mixing old and new leaves creates uneven spring rates and accelerated wear. Replace the bush (60057036) and all U‑bolt nuts at the same time. Keep a detailed maintenance log of spring replacement dates, torque measurements, and any observed cracking. By following this proactive schedule, the Sany Spring Assembly-Rear Steel Plate can exceed 15,000 hours of reliable service.

The progressive spring rate of the Sany Spring Assembly-Rear Steel Plate is achieved through the graduated lengths of the 14 leaves. The main leaf (1st sheet, longest) flexes under light loads. As the load increases, the 2nd, 3rd, and successively shorter leaves make contact with the leaves above them, increasing the pack’s overall stiffness. This provides a comfortable ride when the truck is empty and a stable, sag-resistant ride when fully loaded.

The spring steel used in the Sany Spring Assembly-Rear Steel Plate is comparable to SUP11A grade, a manganese‑chromium alloy steel known for its high strength, toughness, and fatigue resistance. This alloy contains 0.56‑0.64% carbon, 0.70‑1.00% manganese, and 0.70‑1.00% chromium, with a trace addition of boron (0.0005‑0.0050%) that enhances hardenability. The shot‑peened surface treatment creates compressive residual stresses that resist crack initiation and propagation, dramatically extending the spring’s service life in mining applications where cyclic loading is constant.

When replacing the Sany Spring Assembly-Rear Steel Plate, always use a spring‑compressing tool to safely remove the old spring pack—never attempt to remove a loaded leaf spring without proper equipment. After installation, verify that all leaf ends are aligned correctly and that the spring center bolt is seated in the locating hole of the axle seat before torquing the U‑bolts. The bush (60057036) should be replaced whenever the spring pack is removed, as the rubber or polyurethane material degrades with age and cannot be reused.

For Sany mining trucks operating in extreme cold climates (below -25°C), inspect the spring assembly more frequently for cracking. Steel becomes more brittle at low temperatures, and the impact forces encountered when traversing frozen ground can cause leaf fracture. Sany recommends using low‑temperature spring bushings for arctic applications, and operators should avoid harsh impacts—such as dropping off rock ledges or hitting frozen potholes at speed—to prevent spring breakage. The progressive spring rate remains effective at low temperatures, but the inter‑leaf friction increases, so cleaning the spring pack to remove ice and mud is especially important in winter conditions.

The Sany Spring Assembly-Rear Steel Plate is also available as part of a complete rear suspension rebuild kit, which includes both left and right spring packs, U‑bolts, bushings, and shock absorbers. Sany recommends this complete‑kit approach for vehicles with over 10,000 operating hours, as it allows the entire suspension system to be renewed in a single maintenance event. Fleet managers who adopt this strategy report a 40% reduction in suspension‑related breakdowns and a 30% reduction in total maintenance costs over the equipment’s life. Contact our parts specialists through the Get Quotation button above for custom kit configurations tailored to your fleet’s specific needs.