Cub Cadet 8454 - Manual (Page 276)

CHAPTER 6 8454
6-82 D569-W02 May-2003
(Neutral Stage)
Components Trouble Checking Remark
3. MLS valve assem-
bly (operation
principle)
Operation principle of MLS valve neutral stage
The supply oil 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), the falling valve (4) shall be neutral stage as
the pipe line (C) is closed.
Operation of main components
(1) Piston: Spool (2) is operated by a link and operated up & down
acc.to opening/closing of pipe line (A).
- When pipe line (A) is closed: piston falls down by oil pressure to
open the pipe line (B) and oil is exhausted to the transmission
case.
(neutral/supply stage).
- When pipe line (A) is open: piston is lifted by a spring to close the
pipe line (B) and oil is supplied to the cylinder (supply stage).
(2) Spool: spool is operated by a link device to control the open/close
of pipe line (A) and determine the exhaust, supply and neutral
stage.
(3) Check valve: check valve is operated acc.to operation of spool (2),
i.e. opening/closing of pipe line (A).
- When pipe line (A) is closed: check valve does not work (exhaust,
neutral stage).
- When pipe line (A) is open: check valve is operated upward by oil
pressure (supply stage).
(1) Piston
(2) Spool
(3) Check Valve
(4) Falling Valve
569W6B4A