WINCH OPERATION
HYDRAULIC SYSTEM
The winch contains an independent, internal hydraulic
system. The winch case serves as a reservoir and
stores filtered oil for the internally mounted hydraulic
pump. The pump is driven by a gear pressed onto the
bevel pinion gear, and supplies oil as long as the tractor
PTO shaft is turning. Oil from the pump is then routed
through a pressure filter then directed to the control
valve in the winch case where a stand-by system pres-
sure is maintained at 320-410 PSI (2210-2830 kPa).
Movement of the control lever initiates electrical signals
which are routed to solenoids on the control valve in the
winch. Oil is then routed to the appropriate Reel-In or
Reel-Out clutch, Brake pack or Freespool cylinder to
perform the selected winch function.
The winch hydraulic system is equipped with a piston-
type accumulator. The accumulator stores a small
amount of oil at system pressure to assist the applica-
tion of clutches and release the brake under all operat-
ing conditions.
The stored oil supply may also be used to release the
spring-applied brake whenever the tractor engine or
torque converter is stalled. The accumulator-stored oil
is continuously refilled by the winch pump and valve
whenever the tractor PTO is turning.
NOTE: On tractors which supply PTO power
through the torque converter, it is possible to
cause the torque converter to stall if the tractor
engine speed is too low. It is important that engine
idle be set to factory specifications.
GEAR TRAIN
The winch bevel pinion, bevel gears, hydraulic pump
and clutch friction discs are rotating whenever the trac-
tor PTO shaft is rotating. Application of a clutch, Reel-
In or Reel-Out, and the simultaneous release of the
brake will cause rotation of the remaining gear train and
cable drum. See illustrations below.
Discharge the accumulator oil supply BEFORE
removing any hydraulic lines or servicing the winch.
Personal injury may result from the sudden release of
oil under pressure. To discharge the accumulator,
shut the engine off, then slowly cycle the Power Shift
control lever into full Reel-In and Reel-Out positions a
minimum of five (5) times. The tractor master switch
and ignition must be ON.
CAUTION
Low PTO
4 Shaft
Gear Train
Standard PTO
3 Shaft
Gear Train
4
i
The clutch shaft assembly (with bevel gears) must turn
40.4 times for one (1) rotation of the cable drum on a 4
shaft gear train winch and 22.3 times on a 3 shaft gear
train winch.
The direction of the tractor PTO shaft rotation and the
right and left hand clutch location is determined by fac-
ing the rear of the tractor.
The cable drum rotation may be easily changed from
overwind (standard) to underwind by reversing clutch
pressure lines at ports C
1
and C
2
on the control valve in
the winch, and installing the wire rope in the opposite
cable drum ferrule pocket.
Содержание CARCO 50B
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