Two-Spool Control Valve - New Holland TC21D Operator's Manual

SECTION 2 - OPERATION

TWO-SPOOL CONTROL VALVE

(OPTIONAL)
The optional two-spool control valve is mounted on
the right side of the clutch housing beside the engine
hood. This valve is used mainly for front end loader
operation, but may also be used to operate other
front-mounted implements.
To operate the two-spool valve, pull the control lever
to the rear or push it sideways to the right to extend
the cylinder.
NOTE: When the control lever is pushed right to the
second position, a regenerative feature is activated
and the exhaust oil from one end of the cylinder is
transferred to the other end of the cylinder. When this
feature is used, the cylinder will operate at a faster
rate. This regenerative feature cannot be used with
single-acting cylinders.
Push the control lever forward or pull it sideways to
the left to retract the cylinder. Release the control
lever to stop the cylinder in any position before it is
fully extended. The lever automatically returns to
neutral. Fully forward past the detent position is a
"FLOAT" position which allows a cylinder to extend or
retract freely.
The two spool valve is equipped with a valve lock
feature. The valve lock, mechanically locks the boom
1
spool linkage in the neutral position, (if loader is
installed), the lock does not affect the bucket spool
linkage. To operate lock, pull and turn the knob, 1, to
release valve lock. To engage lock, turn knob and
release, the lock mechanism is spring loaded to the
engaged position.
NOTE: The valve lock is recommended to be used to
prevent accidental activation of the boom spool
during operation of the tractor. The lock is not
intended and will not prevent leak down of loader
boom during periods of storage.
WARNING
Before disconnecting cylinders or equipment,
make sure that the implement or equipment is
supported securely.
Remote couplers must be properly mounted and
securely fastened to the tractor mounting
bracket for proper functioning of the safety
disconnect feature.
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