MTS Series 311 Load Frame - Manual (Page 58)

Series 311 Load Frame 58
Bleeding the Hydraulic Lift Cylinders
Maintenance
7. Briefly turn the lift control to lift the crosshead position so the lift cylinders
pressurize. Then return it to the stop crosshead position.
Close When Bubble-Free
8. Shut the bleed port when bubble-free fluid begins oozing out. If necessary,
again pressurize the lift cylinders to force all the air out.
9. Repeat Step 6 through Step 8 to bleed the air out of the other lift cylinder.
Note If fluid continues to leak out of a shut bleed port, turn off hydraulic
pressure to the load frame. Let the pressure in the lift cylinders return to
zero. Then replace both bleed port screws (MTS part number
010-037-601).
10. Turn on high hydraulic pressure. If pressure was reduced at the hydraulic
power unit, restore full pressure.
11. Briefly turn the Lift Control to the lift crosshead position to pressurize the
lift cylinders. Then return it to the stop crosshead position.
12. Unlock the crosshead and exercise the crosshead. Then return to the stop
crosshead position. Raise and lower the crosshead to check for smooth
operation. Lock the crosshead.
13. If the crosshead does not move smoothly, go back to Step 4 and continue
from there.