Cub Cadet 8454 Service Manual page 278

CHAPTER 6 8454
Components
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.
(1) Piston
(2) Spool
Operation of main components
(1) Piston: as spool (2) opens the pipe line (A), piston (1) closes the
(2) Spool: spool (2) is pushed by a link device to the direction of
(3) Check valve: opened by oil pressure. When the rise of lift arm is
(4) Falling valve: to close the pipe line (C).
6-84
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www.mymowerparts.com
Trouble Checking
(supply stage)
pipe line (B).
when the rise of lift arm is completed, piston (1) falls down by oil
pressure to open the pipe line (B).
arrows to open the pipe line (A).
completed, the pipe line (B) is open while check valve does not
work.
569W6B6A
(3) Check Valve
(4) Falling Valve
Remark
D569-W02 May-2003