Kubota M5040, Workshop Manual

Page: 522 / 559

10-S14
M5040, M6040, M7040, WSM CABIN
Insufficient Refrigerant
1. Symptoms seen in refrigerating cycle
- Both LO and HI pressure side (1), (2) pressures too low.
LO pressure side (1) : 0.05 to 0.10 MPa
(0.5 to 1.0 kgf/cm
2
, 7.1 to 14.2 psi)
HI pressure side (2) : 0.69 to 0.98 MPa
(7 to 10 kgf/cm
2
, 99.6 to 142.2 psi)
- Bubbles seen in sight glass.
- Air discharged from air conditioner sightly cold.
2. Probable cause
- Gas leaking from some place in refrigerant cycle.
3. Solution
- Check for leakage with electric gas leak tester (refer to “[1]
HANDLING OF SERVICE TOOLS” in this section) and repair.
- Recharge refrigerant to the proper level. (Refer to “(4)
Checking Charge Refrigerant Amount” in this section.)
W1016070
Excessive Refrigerant or Insufficient Condenser Cooling
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)
2. Probable cause
- Overcharging refrigerant into cycle.
- Condenser cooling faulty.
3. Solution
- Clean condenser. (Refer to “7. CHECK AND MAINTENANCE”
at “G. GENERAL” section.)
- Adjust air conditioner belt to proper tension. (Refer to “7.
CHECK AND MAINTENANCE” at “G. GENERAL” section.)
- If the above two items are in normal condition, check refrigerant
quantity. (Refer to “(4) Checking Charge Refrigerant Amount”
in this section.)
NOTE
Q
• If excessive refrigerant is to be discharged, loosen manifold
gauge LO pressure side valve and vent out slowly.
W1016402
(1) LO Pressure Side (2) HI Pressure Side
(1) LO Pressure Side (2) HI Pressure Side
KiSC issued 06, 2008 A