Takeuchi TB175W, Руководство по ремонту

Страница: 255 / 851

HYDRAULIC UNITS
RAM LOCK CYLINDER
IV-119
TB175W
3. Start-up and bleeding
At start-up, all components must be filled with oil and bled of air.
This is done as follows:
• Remove lock bolts from cylinder (pos. 10).
• Press rod down as far as bearing.
WARNING! Regardless of cylinder type, the check valve case projects fairly far into the oil filler bore. Be careful
not to damage the valve case when pressing down on the rod.
• The rod can also be pressed down hydraulically.
• Fill the cylinder area with oil and re-insert the lock bolts.
• To bleed both cylinders, undo the bleed screws at Pos. 11 and fill with oil until no more air comes out.
• Do up bleed screws but do not tighten. The screws should be easy to loosen.
• Apply control pressure to cylinder and tighten bleed screws until oil comes out without air bubbles. Bleeding is now
complete.
The entire bleeding operation should be carried out under clean conditions.
4. Fault-finding
a) If the rigid axle fails to support a cylinder, the rod seal, Pos. 7, and the tightness of the check valve case, Pos. 3, should
be checked and the parts replaced if necessary.
b) If the axle cannot be brought to a variable position after switching off and on several times, the following should be
checked:
• At very high cylinder loads the internal cylinder pressure cannot be released (see Functional Description)
• The unit needs bleeding (see Start-up)
• If the operation of the axle is not rectified by bleeding, check whether there is adequate control pressure (see Functional
Description)
• If the previous points do not reveal any fault, the smooth operation of the control piston, Pos. 5, of the non-return valve
must also be checked (see Repair Instructions).
5. Repair Instructions
a) Changing the rod seal
• Remove lock bolt, Pos. 10.
• Push down and remove rod, Pos. 2.
WARNING! Do not damage rod surface.
• Remove grooved ring using a round-edged tool.
WARNING! Do not damage the recess surface.
• Check scraper, Pos. 6, for damage and replace if necessary.
• Grease seals.
• Re-insert rod.