Product Manual

10
AIR BLEED INSTRUCTIONS
FOR DISPLACEMENT-STYLE HYDRAULIC CYLINDER
When air enters the hydraulic cylinders of the lift, it can often cause undesirable effects.
Some systems of air in the cylinders include:
- jeriness or bounciness when operating the unit;
- a delay before movement begins when the "UP" control (push-button or pedal) is pressed, and;
- locking of the safety velocity fuse(s) in the lift cylinder(s) when the "DOWN" control (push-button or pedal) is
pressed, which prevents the unit from lowering.
To bleed the displacement-style cylinders:
If the cylinders are inaccessible with the unit lowered, as with our scissor lift tables, raise the platform and then lower
the legs so that they restore the unit's maintenance props. Otherwise, if the cylinders are accessible with the unit fully
lowered, begin wit the unit in the lowered position.
Locate the bleeder valve on the top end of the cylinder(s). It will look something like a grease zirk. Use a 5/16" or 3/8"
wrench to open the bleeder valve about 1/2 turn and then place a rag over it to contain the oil that will come out will the
air when it is bled. Jog the motor by pressing the "UP" control for just a second. If there is air in the cylinder, oil and air
should spit and sputter out of the bleeder valve.
Jog the motor several times (wait at least five seconds in-between) until the sputtering stops and only clear oil streams
from the bleeder valve. When you're certain all the air has escaped, close the valve(s).
Check the level of the hydraulic fluid in the reservoir. If the oil is not within 1-1/2" of the fill hole, add oil until it reaches
that level. Then operate the unit and verify that it raises and lowers smoothly.