Vestil GLT-4000 - Manual (Page 8)

8
AIR BLEED PROCEDURE
If your unit descends very slowly or will not descend at all, air could be trapped in the hydraulic circuit
and must be "bled" from the system. If you experience the above, follow these directions.
1.) Completely lower the platform and remove the load.
2.) Remove one cylinder from its mounting points.
3.) Rotate the cylinder so that the end with the pressure hose connection is "up" or is higher than any other point
of the cylinder. This will allow the air to travel to a point in the cylinder where it can be expelled.
4.) Loosen the hose connection approximately 1/4 to 1/2 turn to allow trapped air to escape.
Using extreme
caution, you may need to "jog" the power unit slightly by quickly, momentarily depressing the UP button.
Jogging the power unit will pressurize the hydraulic system, forcing trapped air from the cylinder.
5.) When the cylinder is free of air, tighten the hose connector fitting and reinstall the cylinder. Please note: The
cylinder is now likely to be too long to fit into the original mounting points. To collapse the cylinder depress the
DOWN button and manually force the cylinder back to its original length to install.
6.) Repeat procedure with other cylinder.
HYDRAULIC SCHEMATIC