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hydraulic system self bleed from repeated use
what you have are piston seal worn, cylinder walls damaged allowing bypass of oil or faulty control valve units
Sometimes with hydraulics you need to "burp" any air from the system, though they tend to be so-called self bleeding. Try filling the filter with fluid and check that the pump has fluid in it to get it pumping. If the fluid was drained from the pump and it has air in it, it won't do anything. Get some fluid in it and it may start pumping.
you bleed a hydraulic clutch the same way you bleed a brake system and it uses brake fluid as well.you keep bleeding until there is no more air in the clutch system.there should be a bleeder screw on the clutch slave cylinder that is were you bleed the clutch from.
Like other hydraulic systems, there is probably a procedure for bleeding the lines after loss of most of the fluid.
You may still have air trapped in the system and once it works its way to the cylinder, the cylinder is working with air instead of fluid and the air compresses instead of doing work.
Hydraulic Clutch System BLEEDING
The clutch system can be bled using a pressure bleeder. Follow the instructions that come with the pressure bleeder for the proper pressure bleeding procedure. The maximum line pressure while pressure bleeding must not exceed 36 psi (248 kPa).
NOTE: To bleed a clutch manually requires the assistance of a second person, a section of hose that is compatible with brake fluid (preferably clear) and fits the slave cylinder bleed screw snugly and a container to catch the fluid that is bled through the system. As brake hydraulic fluid easily absorbs moisture, always use fresh fluid when bleeding a hydraulic system.
Before servicing the vehicle, refer to the precautions in the beginning of this section.
To bleed the system perform the following:
Top off the hydraulic fluid reservoir using a fluid that meets the standards of the vehicle's hydraulic system.
Open the clutch slave cylinder bleed screw and press the clutch pedal to the floor and hold the pedal down.
Close the clutch slave cylinder bleed screw.
Release the clutch pedal.
Check the hydraulic fluid level and top off as necessary.
Repeat the above steps until the discharged fluid is clean and no air bubbles appear during the bleeding process.
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