heavy facts

Genuine Volvo Parts

V-stay
V-stays are a part of the rear air and leaf suspensions. The main function of V-stay is to keep the rear axle in position
(longitudinal/lateral) and allow vertical displacement/axle roll. The V-stay is fitted directly to the frame and rear axle.
The centre joint and two outer joints of the V-stay makes it possible to follow the vertical movements of the rear axle.

Additional function is to reduce transmission of noise and vibrations

from rear axle to frame.
Severe consequences might occur if the main function does
not remain.
Therefore, worn out joints and/or bearings must not result in
separation and loss of main function. This has been secured by a
redundant function in particular to air-suspended trucks.

FEATURES BENEFITS

Volvo specifies suspension components to vehicle type, weight • Ensure optimal suspension performance
and operation
V-stay specifications and tests criteria meets all Volvo Trucks • Ensures that V-stay works perfectly together with the other
­environmental and application criteria ­suspension components of the vehicle
• Improves durability and uptime
Safe functioning even in extreme temperatures and conditions • Ensures safety
Provides safe functioning at optimum operating cost • Low operating cost
Material with excellent properties • Reduced wear and increased durability

2017-11-16 ENG Version 01 1 (2)

heavy facts
Genuine Volvo Parts

The difference These tests are based on many years of field experience and
customer data.
It takes 3–5 years of thorough development and testing before a To finally prove the suitability and robustness of suspension
new suspension system is approved. components, intensive testing on complete vehicle in an extensive
The V-stay should be able to perform in all kinds of conditions number of field tests are performed in all kinds of applications and
such as desert heat, Siberian snow as well as dusty and muddy operational conditions worldwide.
environments.
Already at the design stage, suspension components are Service
designed to have an optimized performance together. The V-stay
has a tailored design to match packaging requirements and to To guarantee the highest quality of the repair, and the longest lifetime
make it easier for bodybuilders to work with afterwards, especially of the component, it is recommended to have the following skills,
in vertical direction. competence, tools and equipment:
The v-stay is exposed to all types of climates and road conditions. • Access and ability to use Volvo Trucks recommended tools to
The v-stay is resistant to ozone, UV-radiation, cleaning fluids, ensure the quality of the repair and shortest repair time.
high-pressure cleaning, salt spray and sand/gravel/stones from • Ability to use Volvo Trucks service information in order to be
the road. able to apply the correct and safe repair procedures.
The joints between component parts are watertight and all parts • Use of Volvo Trucks service information on all required parts
are dry at assembly. needed for the repair, in order to plan and perform the repair
No corrosion allowed inside tubes and parts are protected without waiting for needed parts.
against moisture during transportation and storage. No handle
defects, e.g. hit marks etc., are allowed. Only by having the parts fitted in a Volvo Workshop by a certified
Bearing housings, including sealings, are completely sealed. and fully trained Volvo technician, can you be sure of the best
possible levels of service, uptime and efficiency.
Extensive testing Service and repair operations can be found in Impact, function
group: 652/655.
To ensure the very best lifetime performance, these components
undergo a number of extensive tests at Volvo Trucks such as: Environment
• Handling
• Rig test Genuine Volvo suspension components are designed according
• Safety test to strict requirements for environmental care, which cover hazard-
• AET (Accelerated Endurance test) ous substances, recyclability and material emissions. Recycling
• Field tests considerations are included in the design process: the goal is to
• Corrosion test improve the product’s ability to be recycled, thereby increasing its
recycling value.
Supplier tests:
• Tightness test Exchange parts
• Fatigue test of complete v-stay
• Peak load tests No remanufacturing.
• End bushing centre bar fatigue test
• Rubber bushing wear tests Recommended additional parts
• Rubber bushing movement test
• Joint tests We recommend complete V-stay and two repair kits as spare
• End bushing push out test parts for:
• Sealing bellows material test • Centre bearing
• Outer bushing.

2 (2)