HYDRAULIC SYSTEM
B2420, WSM
8-M8
[4] HYDRAULIC CYLINDER
The main components of the hydraulic cylinder are shown in the figure above. While the lift arm (5) is rising, oil
from the hydraulic pump flows into the hydraulic cylinder through the control valve (6). Then oil pushes out the piston
(11).
While the lift arm (5) is lowering, oil in the hydraulic cylinder is discharged to the transmission case through the
control valve (6) by the weight of the implement. At this time, the lowering speed of the implement can be controlled
by the lowering speed adjusting valve (2) attached to the hydraulic cylinder (3). Turning the lowering speed adjusting
knob clockwise decreases the lowering speed, and counterclockwise increases lowering speed. When the lowering
speed adjusting valve (2) is completely closed, the lift arm (5) is held at its position since oil in the hydraulic cylinder
is sealed between the piston (11) and lowering speed adjusting valve (2).
9Y1210436HYM0011US0
(1) Lowering Speed Adjusting
Shaft
(2) Lowering Speed Adjusting
Valve
(3) Hydraulic Cylinder
(4) Hydraulic Arm
(5) Lift Arm
(6) Control Valve
(7) Relief Valve
(8) Hydraulic Rod
(9) Back-up Ring
(10) O-ring
(11) Piston
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