Help with troubleshooting a scissor lift

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SUMMARY

The discussion centers on troubleshooting a scissor lift that operates correctly with one person but fails to ascend with two individuals onboard. Key issues identified include potential hydraulic flow restrictions, faulty valves, and the condition of hydraulic components. Participants suggest checking the pressure relief valve, inspecting for filter debris, and measuring hydraulic pressure with a gauge. Additionally, the condition of the hydraulic oil and seals is critical for proper functionality.

PREREQUISITES
  • Understanding of hydraulic systems and components
  • Familiarity with pressure relief valves
  • Knowledge of hydraulic oil maintenance and filtration
  • Ability to measure hydraulic pressure using gauges
NEXT STEPS
  • Inspect and test the pressure relief valve for proper operation
  • Check for debris in the hydraulic oil filter and replace if necessary
  • Measure hydraulic pressure using a gauge to assess system performance
  • Examine hydraulic cylinder seals and piston rods for wear or damage
USEFUL FOR

Maintenance technicians, equipment operators, and anyone involved in the upkeep and troubleshooting of hydraulic scissor lifts.

henrydavid
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I http://www.pentalift.com/lift-tables/scissor-lifts&multi-stage.php. It works fine, when a single person is in the lift, but when 2 people of average weight are in the lift it will not go up properly. We haven’t exceeded the rated maximum capacity of the lift platform. It seems like it does not have enough power or hydraulic flow to raise the platform with the weight of 2 people for some unknown reason. I had a look and there is plenty of hydraulic oil in the reservoir. Could it be due to some faulty valve or something restricting the flow? Can anyone offer me some tips where to check?
 
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It could be a problem with the pressure relief valve. Is there metal of filter debris in the hydraulics?
Are there bubbles in the hydraulic oil due to sucking air through pump seals? Have you replaced the hydraulic oil filter?
Are you able to measure the hydraulic pressure? Fit a gauge so you can see pressure rise to relief when hydraulics are activated.
Maybe a hydraulic cylinder piston seal is failing. Maybe a piston rod is bent.
 

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