Lifting of vehicles and components for automotive repair and heavy vehicle maintenance is a common task in many service operations. Whilst some technicians may feel that speed of lift is important, it is generally more important to have a heavy and stable lift so that the load is secure. A fast lift may save seconds but seconds are little compensation for the danger to the technician and the equipment.
Understanding why stability is important will help to ensure that safe lifting practices are maintained in the workshop and will help to protect expensive vehicles from damage.
What Is Load Stability?
Load stability is defined as that portion of the time required to lift a vehicle that it remains in a balanced and stable position throughout its entire movement prior to, during and after being struck by a lifting device. It includes:
- Proper weight distribution
- Secure contact with lifting points
- Controlled lifting movement
- Balanced support during maintenance
Stable lifting ensures the vehicle remains steady while technicians perform repairs underneath.
The Risks of Prioritizing Lift Speed
High speed in the context of lifting systems appears to make sense from a productivity perspective, however there are a number of potential hazards and risks to consider.
1. Increased Risk of Vehicle Shifting
Raising a vehicle too quickly can alter the weight distribution of the vehicle. A single move of the wheel can also cause the jack saddle to move away from the designated lifting point.
This is particularly true when lifting heavy vehicles with truck jacks and the total load weight can be several tons.
2. Greater Stress on Vehicle Components
Rapid lifting can place unnecessary stress on structural components such as:
- Frame rails
- Suspension arms
- Pinch welds
- Axle supports
Carefully lifting the car allows the structure of the car to be lifted with even weights rather than being slammed upwards by a sudden jolt.
3. Reduced Control During Operation
Time must be given to the technician to see how the vehicle behaves during lifting. If lift speed is too high, this can be difficult to assess:
- Improper jack placement
- Uneven lifting points
- Load imbalance
Stable lifting provides the operator with better control and reaction time.
Key Factors That Improve Load Stability
1. Wide and Stable Base Design
A wider base on the jack will help to disperse the weight more evenly and prevent it from tipping. Best to use on very heavy vehicles like trucks and buses.
2. Proper Lift Point Alignment
On some types of vehicles there will be defined lifting points on the chassis. These should be located and then the jack saddle placed centrally on each, to ensure even load distribution.
Misalignment can cause instability even if the lifting equipment is powerful.
3. High-Quality Hydraulic Systems
Hydraulic system has to be reliable for the crane to lift in an easy and controlled manner. Large variations in hydraulic pressure can cause the crane to lift in a harsher manner, which can affect the stability of the load.
Well designed truck jacks may use multi-stage cylinders and safety locks to provide a consistent lift.
4. Safety Lock Mechanisms
Hydraulic Mechanical Safety Locks – The mechanical safety locks are activated when the load is on and the vehicle has reached the working height. They provide a further safety measure in the event of pressure loss of the hydraulic system, thus preventing unintended lowering of the load.
Why Stability Improves Workshop Safety
When lifting equipment prioritizes stability, workshops benefit in several ways:
- Reduced risk of accidents
- Better technician safety
- More precise repair work
- Less equipment wear
- Improved vehicle protection
Stable lifting provides a safe and solid base for lifting and weighing vehicles. It enhances the safety and productivity of the shop, while giving the technician more confidence in tasks such as suspension repair, tire changes and brake work.
The Role of Equipment Design
Modern lifting equipment production is characterized by a significant focus on load stability engineering. This often involves the use of heavy frame constructions, swinging/lowering arms that can be positioned and adjusted, as well as balanced hydraulic cylinders.
Reliable work shops that invest in quality lifting equipment are generally safer and more efficient.
Conclusion
Lift speed is not a measure of efficiency, but rather load stability is what is important to lifting operations. A stable lifting system will maintain the balance of the vehicle, protect the technician working underneath, and prevent unnecessary damage to the vehicle structure.
Putting stability over performance gives us the ability to create a safer, more reliable work environment that can accommodate heavy commercial trucks and one stop maintenance. As part of this philosophy, manufacturers like Stan Design design heavy duty shackles that create a stable, secure platform for safe and efficient servicing in the production environment of a professional workshop.