Kubota KX080-4 Workshop Manual page 441

KX080-4, WSM
Magnetic Clutch
A magnetic clutch is a device that governs the
mechanical linkage between the engine and the
compressor. When the engine is rotating and the AC
switch is on, air at cabin temperature comes out and
when the temperature reaches the temperature set with
the temperature control switch, or when the cabin gets
hot, the clutch works to stop or to drive the compressor,
respectively.
The hub of the magnetic clutch is attached to the
compressor shaft and when it is not driving the
compressor, it is separate from the rotor and just the
pulley turns. When the AC switch is turned on, current
flows into the stator coil, making the stator into a magnet,
which then holds onto the hub and the pulley turns along
with the compressor.
(1) Pressure Plate
(2) Ball Bearing
(3) Snap Ring
(4) Pulley
B. Safety Valve
The valve opens when the refrigerant pressure
reaches the specified pressure, thus relieving the
pressure. When the pressure becomes abnormally high,
it overcomes the force of the spring, allowing refrigerant
to leak out of the relief port; when the pressure drops the
reverse happens--the spring overcomes the pressure
and the safety valve closes. When an error occurs, this
also keeps the discharge of refrigerant to a minimum.
(1) Safety Valve
(A) Refrigerant Leak Route
(B) Functional Characteristics
(C) Amount of Refrigerant
Leaked
(D) Pressure
5-M4
CABIN
(5) Rotor w/ Pulley
(6) Stator
(7) Snap Ring
RY9212001CAM0006US0
a : 113 L/min.
(27.2 U.S.gals./min.,
24.86 lmp.gals./min.)
b : 2.75 MPa
2
(28.1 kgf/cm , 399.7 psi)
c : 3.43 MPa
2
(35.0 kgf/cm , 497.8 psi)
d : 4.12 MPa
2
(42.0 kgf/cm , 598.0 psi)
RY9212001CAM0007US0
KiSC issued 08, 2015 A