320C Excavator Hydraulic System – Cylinders (Boom, Stick and Bucket)



Illustration 1 g01335559

(1) Rod end port

(2) Head end port

(3) Boom cylinder

(4) Tube

(5) Rod

(6) Snubber

(7) Piston

(8) Stick cylinder

(9) Snubber

(10) Bucket cylinder



Illustration 2 g01335561

Snubber operation

(6) Snubber

(11) Passage

When boom cylinders (3) or stick cylinder (8) moves close to the end of the extension stroke, passage (11) is restricted by snubber (6) . The movement of the piston rod slows down before the piston rod stops.




Illustration 3 g01335562

Snubber operation (retracting rod)

(9) Snubber

(12) Passage

When stick cylinder (8) moves close to the end of the retraction stroke, passage (12) is restricted by snubber (9) . The movement of the piston rod slows down before the piston rod stops. The shock load is absorbed when the piston is slowed down.