Komatsu PC88MR-10 Shop Manual page 172

Hydraulic excavator

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10 Structure and function

Control valve

When cylinder head pressure is higher than the bottom pressure (when digging, etc.)

During the arm "IN" operation, if bottom pressure (B) of arm cylinder (1) is higher than head pressure (A)

and the arm is loaded, check valve (3) closes to disconnect the head side and bottom side.

If the arm is loaded during the arm "IN" operation, bottom pressure (B) of arm cylinder (1) is higher than

head pressure (A).

Check valve (3) is closed by bottom pressure (B) and spring (4), and circuits on head side and bottom side

are disconnected.

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