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Question

Difficulty: EasyLifting and Supporting Loads

A technician needs to raise the front end of a vehicle to perform an undercarriage inspection. Arrange the following steps in the correct chronological order to safely lift and support the vehicle.

  1. 1Park the vehicle on a level surface, engage the parking brake, and place wheel chocks against the rear wheels.
  2. 2Position the hydraulic floor jack beneath the manufacturer-specified front lift point and raise the vehicle.
  3. 3Position rated jack stands beneath the designated structural support points and lower the jack until the weight rests entirely on the stands.
  4. 4Gently push or rock the vehicle to verify that it is completely stable on the stands before performing any work.

Answer

The correct sequence begins with immobilizing the vehicle and chocking the wheels, raising the vehicle with a floor jack at the specified lift point, placing jack stands and lowering the vehicle onto them, and finally verifying stability before beginning inspection.
The correct sequence ensures full safety at each phase: first immobilizing the vehicle to prevent rolling, second using a hydraulic jack only for dynamic lifting at reinforced points, third transferring the load onto mechanical jack stands for static support, and fourth performing a physical stability check prior to work.

Step-by-Step Solution

1
Immobilize the vehicle by setting the parking brake and placing wheel chocks on the wheels remaining on the ground.
The vehicle is stabilized against unwanted forward or backward movement during lifting.
Preventing rolling is the essential first safety measure before elevating any portion of a vehicle.
2
Place the hydraulic floor jack under the designated structural lift point and pump the handle to elevate the front end.
The vehicle is raised to the necessary clearance height.
Using the manufacturer-specified lifting location prevents structural damage to body panels or floorboards.
3
Slide jack stands under the frame or pinch-weld support locations and carefully release hydraulic pressure to lower the vehicle onto the stands.
The vehicle weight is transferred from the hydraulic jack to positive mechanical supports.
Hydraulic jacks are lifting devices only and can lose hydraulic pressure unexpectedly; jack stands are required for static load holding.
4
Apply gentle physical force to the bumper or fender to check for any shifting or instability.
Confirmation that the vehicle is securely seated and will not slip or topple.
Verifying stability before crawling underneath ensures the technician is protected from crushing hazards.

Key Concept

Proper procedural sequence for lifting, mechanically supporting, and verifying the stability of an automotive load
Estimated Time:45s
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Topics

Lifting and Supporting Loads

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