Kubota KX080-3 Workshop Manual page 744

WSM KX080-3 Service
Reference
On the EPR (Evaporator Pressure Regulator) type car air conditioner, the low-pressure side level rises
and drops from the level of about 0.18 MPa (1.8 kgf/cm
ature is low.
The gauge manifold may read somewhat different pressures depending on the conditions.
An overcharge of refrigerant may cause poor cooling effect, overheat or other trouble.
2. Using the sight glass
1) Place the machine in the following conditions.
Door
Air conditioner (magnetic clutch)
Engine rpm
Inside/outside air select damper position
Temperature setting
Blower speed
2) Look at the sight glass to see how well the refrigerant flows in the air conditioner circuit.
For all the systems other than subcool condenser type
Refrigerant charge
Proper amount
Overcharge
Refrigerant shortage
(1)
Item
No or little bubbles are contained. Gradually raise the engine speed from idling to 1500 rpm,
and the bubbles disappear and the fluid becomes transparent.
No bubbles are contained. The pressures at both the high-pressure and low-pressure sides are
too high, resulting in poor cooling effect.
Bubbles appear continuously.
(1)
VI-S-12
2
) at regular intervals, if the outside air temper-
(2)
Conditions
Fully open
ON
1500 rpm
Inside air mode
MAX COOL (Coolest)
HI
Condition
(2) (3)
VI Air Conditioner
(1) Low-pressure side
(2) High-pressure side
(1) Too much
(2) Proper
(3) Too short