RENAULT TRUCK

What are the functions of a leaf spring on my Renault Truck?

Despite its name, a leaf spring serves multiple purposes. Its main function is to link the axle and chassis, making it a crucial component. Consequence: If the leaf spring, particularly the main spring leaf, is broken or missing, the axle is not properly fixed to the chassis. In extreme cases, the axle may even move out of position, causing the vehicle to lose control on the road.

The leaf spring is responsible for keeping the axle in the correct direction. As a result, if the leaf spring does not have the correct dimensions, or especially if there are leaf springs with different dimensions on the left and right sides, the axle will not be parallel and the vehicle's driving conditions will be negatively affected. For example, there may be excessive tire wear or the vehicle may pull to the left or right.

Why did the leaf spring break in my Renault Truck?

Leaf spring breakages in Renault Truck can have several causes, and it can be difficult to determine the exact root cause. However, the typical causes include micro cracks on the surface, non-metallic inclusions, improper heat treatment process, surface decarbonization, corrosion, continuous overloading, intensive suspension usage due to poor road conditions, and design mistakes by vehicle manufacturers.

Is it safe to drive a Renault Truck with a broken leaf spring?

The safety depends on several factors: where the leaf spring broke, whether it's a single leaf or spring pack, which leaf is broken, vehicle load status, presence of stabilizer bar, and your risk tolerance. The most dangerous situation is when the main leaf spring breaks between the axle and front fixing point without a stabilizer bar. In such cases, drive at minimum speed and seek urgent servicing.

Can a Renault Truck leaf spring be repaired with welding?

Unfortunately, while spring steels do have some weldability, the welding process can cause changes in the structure of the steel around the joint, resulting in a lack of homogeneity and consistency with the rest of the steel. A welded leaf spring will therefore break very soon (a few weeks).

How can I select and order the correct leaf spring for my Renault Truck?

Our Online Shop offers four options: 1) Use the article number stamped on the spring, 2) Submit vehicle data as an online inquiry with production year and VIN number, 3) Provide production year and number of spring leaves, 4) Measure main dimensions of your current leaf spring. The first two options provide 100% certainty of correct fitment.

Do I have to replace the leaf springs in pairs in my Renault Truck?

70% of our customers do not buy leaf springs in pairs. However, it may be necessary in certain cases: when the vehicle is old and the non-broken spring is weak, when the vehicle was driven with a broken spring for extended periods, or when companies want to minimize service downtime and reduce risk.

Can I replace the leaf spring of my Renault Truck myself?

Replacing a leaf spring does not require specific knowledge, but it can be time-consuming if you lack experience. You will need several tools and must lift and secure the vehicle in a safe position. Our blog contains training videos on how to replace a leaf spring.

Importance of Proper Torque for Renault Truck Leaf Spring U-Bolt Nuts

U-bolts are responsible for securely attaching the leaf springs to the axle. The nuts must be tightened to specific torque values: M8: 35 Nm, M10: 75 Nm, M12: 130 Nm, M14: 200 Nm, M16: 315 Nm, M18: 440 Nm, M20: 610 Nm, M22: 830 Nm. These values apply to surfaces free of oil or grease. U-bolts must be retightened after 1,000 km to 5,000 km.