Scissor Lifts
1.5 hours
Learning Objectives
- •Identify the major components of a scissor lift and explain how the scissor mechanism raises the platform
- •Explain how fall protection on a scissor lift differs from a boom lift and why
- •Describe the stability hazards of scissor lifts, including extension decks and wind
- •State the rules for travel with the platform raised on a scissor lift
Topics Covered
- •Scissor mechanism: crossed (pantograph) arms driven by hydraulic cylinders raise the platform straight up
- •Major components: chassis, scissor stack, platform with guardrails, extension (slide-out) deck, control console
- •Most scissor lifts are Group A MEWPs — the platform stays within the tipping lines
- •OSHA treats scissor lifts as mobile scaffolds, not aerial lifts: a properly maintained guardrail system is the primary fall protection
- •When tie-off is still required: damaged or removed guardrails, or leaning/reaching outside the platform
- •Rated capacity, including the reduced capacity that applies when the extension deck is slid out
- •Indoor electric (slab) scissor lifts vs. rough-terrain scissor lifts
- •Stability hazards: overloading, side forces, potholes, drop-offs, and wind on outdoor units
- •Travel with the platform raised: only permitted within the manufacturer limits and on firm, level ground
Resources
Self-Check Questions
Question 1: How does a scissor lift raise its platform?
- A. A telescoping mast extends upward
- B. Hydraulic cylinders push on crossed pantograph arms, raising the platform vertically(correct)
- C. A winch and cable system hoists the platform
- D. Compressed air inflates lifting bags under the deck
Show Explanation
Explanation:
The crossed "scissor" arms are driven open by hydraulic cylinders, which raises the platform straight up. The platform does not move horizontally the way a boom does.
Question 2: On a scissor lift with a properly maintained guardrail system, what is the primary fall protection?
- A. A personal fall arrest harness attached to an anchor point
- B. The guardrail system itself(correct)
- C. A safety net under the platform
- D. No fall protection is needed at any height
Show Explanation
Explanation:
OSHA treats scissor lifts as mobile scaffolds. With intact guardrails, the guardrail system is the fall protection. A harness becomes necessary if the guardrails are damaged or the worker reaches outside the platform.
Question 3: Why are most scissor lifts classified as Group A MEWPs?
- A. They are battery powered
- B. Their platform stays within the tipping lines of the chassis in all positions(correct)
- C. They cannot exceed 20 feet of platform height
- D. They are only used indoors
Show Explanation
Explanation:
A scissor lift platform rises straight up and stays inside the tipping lines, making it Group A. That is a key difference from boom lifts, which are usually Group B.
Question 4: What happens to a scissor lift rated capacity when the slide-out extension deck is deployed?
- A. It increases because the platform is larger
- B. It stays exactly the same
- C. It is reduced — the extension deck has its own lower capacity rating(correct)
- D. It no longer applies once the deck is out
Show Explanation
Explanation:
The extension deck cantilevers load away from the chassis, so the manufacturer assigns it a separate, lower capacity. The operator must use the reduced rating posted for the extended configuration.
Question 5: A worker on a scissor lift removes a section of the mid-rail to pass material through. What is the correct fall-protection response?
- A. No change is needed — scissor lifts never require harnesses
- B. The worker must now use a personal fall arrest system because the guardrail system is incomplete(correct)
- C. Lower the platform halfway to reduce fall distance
- D. Have a second worker hold the worker by the belt
Show Explanation
Explanation:
The guardrail system only counts as fall protection when it is complete and maintained. Once a rail is removed, the protection is compromised and a personal fall arrest system is required.
Question 6: Which condition would most increase the tip-over risk of an outdoor rough-terrain scissor lift?
- A. Operating with the platform fully lowered
- B. Raising the platform near rated height in gusting wind on uneven ground(correct)
- C. Driving slowly across a level paved lot
- D. Charging the battery overnight
Show Explanation
Explanation:
Wind acts as a side force on the raised platform, and uneven ground shifts the center of gravity toward a tipping line. Manufacturers publish maximum wind speeds — exceeding them with the platform up risks a tip-over.