5-9
Turning right
Turning right
(3)
(3)
When the steering wheel is turned to the right, the pressure oil from the steering unit fill on the right
side chamber of main steering spool (15), and main steering spool (15) moves to the left in the
direction.
At the same time of moving of main steering spool (15), LS signal will be blocked.
If LS signal of main steering spool (15) is blocked, it cause to increase pressure of left chamber of
priority valve (18A) and then priority valve (18) to be pushed to right side. Consequently, oil will
flow via CF of priority valve to main spool. that oil will push steering cylinder rod out and it will
cause wheel loader to be steered to right side.
The rate of movement of main steering spool (15) is concluded as flow rate, which is kept in right
chamber from steering unit. Furthermore the rate controls speed of movement for cylinder.
When the cylinder reaches to end position, pressure of oil flowing through main steering spool (15)
will get to be increased. If the oil pressure increase up to relief pressure to be set, relief valve will
be activated. It result in decreasing pressure of left chamber of priority valve (18A), and will push
priority valve (18) to right side. Then, oil flow to cylinder will be blocked.
·
·
·
·
·
EF
T
P
LS
Ts
P
T
R
L
Ps
KV2
S3
KV1
CL
CR
Shock valves
Suction valves
16
17
18
18A
15
CF
Pressure
reducing
valve
7607SE14
Summary of Contents for HL955
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