Kubota M9540, Workshop Manual

Page: 579 / 619

10-S15
M8540, M9540, WSM CABIN
Air Entered in the Cycle
1. Symptoms seen in refrigerating cycle
- Both LO and HI pressure side (1), (2) pressures too high.
LO pressure side (1) : 0.20 to 0.35 MPa
(2.0 to 3.5 kgf/cm
2
, 28.4 to 49.8 psi)
HI pressure side (2) : 1.96 to 2.45 MPa
(20 to 25 kgf/cm
2
, 284.5 to 355.6 psi)
- LO pressure side (1) piping not cold when touched.
2. Probable cause
- Air entered in refrigerating cycle.
3. Solution
- Replace receiver.
- Check compressor oil contamination and quantity.
- Evacuate and recharge new refrigerant. (Refer to “(3)
Charging the Refrigerant” in this section.)
NOTE
Q
• The above cycle can be seen when the cycle is charged
without evacuation.
W1016771
Moisture Entered in the Cycle
1. Symptoms seen in refrigerating cycle
- The air conditioner operates normally at the beginning, but over
time, LO pressure side (1) pressure is vacuum and HI
pressure side (2) is low pressure.
LO pressure side (1) : Vacuum
HI pressure side (2) : 0.69 to 0.98 MPa
(7 to 10 kgf/cm
2
, 99.6 to 142.2 psi)
2. Probable cause
- The moisture in the refrigerating cycle freezes in the expansion
valve orifice and causes temporary blocking. After a time, the
ice melts and condition returns to normal.
3. Solution
- Replace receiver.
- Remove moisture in cycle by means of repeated evacuation.
(Refer to “(2) Evacuating the System” in this section.)
- Recharge new refrigerant to the proper level. (Refer to “(3)
Charging the Refrigerant” in this section.)
W1017013
(1) LO Pressure Side (2) HI Pressure Side
(1) LO Pressure Side (2) HI Pressure Side
KiSC issued 09, 2008 A