Kubota M6800S Workshop Manual page 624

M6800 · M6800S · M8200 · M9000, WSM
(G) A/C Pressure Switch
HI Pressure Side
1. Connect the manifold gauge (3) to compressor as following
procedure.
Close the HI and LO pressure valves (5), (4) of manifold gauge
tightly, and connect the charging hoses (red and blue) (6), (7) to
the respective compressor service valves. (Refer to HANDLING
OF SERVICE TOOLS : See page 10-S9.)
NOTE
• Be sure to blow out the air in the charging hoses at the
manifold gauge connection end by utilizing the refrigerant
pressure in the refrigerant cycle.
2. Start the engine and set at approx. 1500 min
the A/C switch, then set the blower switch to HI position.
3. Raise pressure on the HI pressure side of the refrigerant cycle by
covering the condenser front with a corrugated carboard, and the
dual switch (8) is activated and the compressor magnetic clutch
is turned off. At this time, read the HI pressure gauge of the
manifold gauge. If this pressure reading differs largely with the
setting pressure, replace the pressure switch with a new one.
Factory
Setting Pressure
spec.
(1) HI (High Pressure Side) Charging
Valve
(2) LO (Low Pressure Side) Charging
Valve
(3) Manifold Gauge
(4) LO Pressure Valve
LO Pressure Side
1. Disconnect 2P connector of pressure switch.
2. Measure the resistance with an ohmmeter across the connector
terminals.
3. If 0 ohm is not indicated at normal condition, there is no
refrigerant in the refrigerating cycle because gas leaks or
pressure switch is defective.
(Reference)
Factory
Setting Pressure
spec.
• The resistance of dual switch is 0 ohm in normal running, but is
becomes infinity if the pressure is abnormal (out of factory spec.).
Because the dual switch starts to work.
(1) HI (High Pressure Side) Charging
Valve
(2) LO (Low Pressure Side) Charging
Valve
(3) Manifold Gauge
(4) LO Pressure Valve
10-S37
−1
(rpm). Turn on
More than
Dual
approx. 3.14 MPa
switch
2
32 kgf/cm
OFF
455 psi
(5) HI Pressure Valve
(6) Charging Hose (Red)
(7) Charging Hose (Blue)
(8) Pressure Switch
(9) Air Conditioner Unit
W1023174
Less than
Dual
approx. 0.196 MPa
switch
2.0 kgf/cm
OFF
28.4 psi
(5) HI Pressure Valve
(6) Charging Hose (Red)
(7) Charging Hose (Blue)
(8) Pressure Switch
(9) Air Conditioner Unit
W1023511
KiSC issued 03, 2008 A
CABIN
2