Cub Cadet 8454 - Manual (Page 278)

CHAPTER 6 8454
6-84 D569-W02 May-2003
Operation principle of MLS valve supply stage
Spool (1) is operated by a link to open the pipe line (A) and the oil
supplied from the pump flows into the cylinder through check valve (3)
while falling valve (4) closes the pipe line (C) to prevent the exhaust of
oil which results in the rise of the lift arm. When the rise of lift arm is
completed, piston (1) falls down by oil pressure to open the pipe line
(B) while check valve does not work.
(supply stage)
Components Trouble Checking Remark
Operation of main components
(1) Piston: as spool (2) opens the pipe line (A), piston (1) closes the
pipe line (B).
when the rise of lift arm is completed, piston (1) falls down by oil
pressure to open the pipe line (B).
(2) Spool: spool (2) is pushed by a link device to the direction of
arrows to open the pipe line (A).
(3) Check valve: opened by oil pressure. When the rise of lift arm is
completed, the pipe line (B) is open while check valve does not
work.
(4) Falling valve: to close the pipe line (C).
(1) Piston
(2) Spool
(3) Check Valve
(4) Falling Valve
569W6B6A