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Difficulty: EasyLifting and Supporting Loads

After raising a vehicle to the desired height using a hydraulic floor jack, which safety procedure must be completed before performing any work underneath the vehicle?

  1. A
    Keep the hydraulic jack pressurized and position cinder blocks under the suspension arms for extra stability.
  2. B
    Leave the vehicle supported solely by the hydraulic floor jack while setting the emergency brake and chocking the remaining wheels.
  3. Support the vehicle with properly rated mechanical jack stands placed at designated lift points and lower the jack weight onto them.Answer
  4. D
    Position adjustable screw jacks directly under the floor pan sheet metal to distribute weight across the body panels.

Answer

Support the vehicle with properly rated mechanical jack stands placed at designated lift points and lower the jack weight onto them.
A hydraulic floor jack is designed strictly to lift a vehicle, never to support it while working underneath. Mechanical jack stands positioned beneath reinforced chassis or designated pinch-weld lift points provide a reliable, positive mechanical support that prevents accidental collapse.

Step-by-Step Solution

1
Differentiate between dynamic lifting devices and static load supports.
Identify that hydraulic floor jacks are engineered strictly for raising or lowering loads, not for holding suspended weight during service.
Hydraulic pressure relies on fluid seals and release valves that can suddenly leak or lose pressure.
2
Select and place the appropriate mechanical support equipment.
Position load-rated jack stands underneath reinforced frame sections or factory-specified lift points.
Mechanical jack stands create a solid, positive-locking support structure that eliminates reliance on hydraulic fluid.
3
Transfer the load and verify stability.
Slowly lower the floor jack until the vehicle's weight rests fully on the jack stands, then check that the vehicle is stable before entering the work area.
Confirms the vehicle is securely seated and prevents accidental movement while working underneath.

Key Concept

Lifting and Supporting Loads
Estimated Time:45s
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Topics

Lifting and Supporting Loads

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