Cub Cadet 8454 Service Manual page 277

Components
2. Double-acting (4) Falling valve: as spool (1) is operated, the falling valve (4) falls
valve assembly
Operation principle of MLS valve exhaust stage
The oil supplied from the pump is exhausted to the transmission
case as spool (2) closes the pipe line (A) and piston (1) falls down by
oil pressure to open the pipe line (B). And while spool (2) falls own,
the falling valve (4) is operated by a spring to open the pipe line (C)
and exhaust the oil of the cylinder which results in the fall of lift arm.
(exhaust stage)
(1) Piston
(2) Spool
Operation of main components
(1) Piston: as spool (2) closes the pipe line (A), piston (1) falls down
(2) Spool: spool (2) is pushed by a link device to the direction of arrow
(3) Check valve: does not work.
(4) Falling valve: as spool (2) falls down, the falling valve (4) falls
D569-W02 May-2003
K&T Saw Shop 606-678-9623 or 606-561-4983
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Trouble Checking
down by a spring to open the pipe line (C) and the oil is exhausted
from the cylinder.
(refer to the figure of "exhaust stage")
to open the pipe line (B).
to close the pipe line (A).
down by a spring to open the pipe line (C).
HYDRAULIC SYSTEM
569W6B5A
(3) Check Valve
(4) Falling Valve
Remark
6-83