wsm B2420 Workshop Manual page 225

B2420, WSM
Right Turning
Operation mechanism for left turning is the same as that for right turning, except for directions of oil flow from and
to the cylinder ports.
Manual Operation
(When Engine Stops or Hydraulic Circuit Troubles)
Even when the engine stops or hydraulic circuit malfunctions thus leading to hydraulic operation stop, manual
operation is possible. However, naturally, steering wheel requires a larger operating power.
If the steering wheel is turned when hydraulic circuit ceases to operate, the worm shaft (3) which is connected
with stub shaft (7) moves slightly by steering force, then the worm shaft (3) and rack (piston) (2) have same
relationship with the manual steering gear.
7-M6
STEERING
(1) Sector Gear Shaft
(2) Rack (Piston)
(3) Worm Shaft
(4) Torsion Bar
(5) Sleeve
(6) Valve Housing
(7) Stub Shaft (Spool)
(8) Relief Valve
(A) From Pump
(B) Return to Suction Line
(l) Chamber "l"
(r) Chamber "r"
P: Pump Port
T: Return Port
L: Cylinder L Port
R: Cylinder R Port
9Y1210436STM0006US0
KiSC issued 06, 2012 A