Kubota B1830, Workshop Manual

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CABIN B1830,B2230,B2530,B3030, WSM
10-S13
Normal Operating
If the refrigerating cycle is operating normally, the reading at the
LO pressure side (1) should be generally by around 0.15 to 0.2 MPa
(1.5 to 2.0 kgf/cm
2
, 21 to 28 psi) and that at the HI pressure side (2)
around 1.27 to 1.66 MPa (13 to 17 kgf/cm
2
, 185 to 242 psi).
9Y1210003CAS0019US0
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 0.1 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 and repair.
• Recharge refrigerant to the proper level. (See page 10-S20.)
9Y1210003CAS0020US0
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):
0.2 to 0.35 MPa (2.0 to 3.5 kgf/cm
2
, 28 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. (See page G-13.)
• Adjust air conditioner belt to proper tension. (See page G-32.)
• If the above two items are in normal condition, check refrigerant
quantity. (See page 10-S20.)
NOTE
• If excessive refrigerant is to be discharged, loosen
manifold gauge LO pressure side valve and vent out
slowly.
9Y1210003CAS0021US0
Gas pressure
Factory
specifica-
tion
Low
pressure
side 0.15 to 0.20 MPa
1.5 to 2.0 kgf/cm
2
21 to 28 psi
High
pressure
side 1.27 to 1.66 MPa
13 to 17 kgf/cm
2
185 to 242 psi
(1) LO Pressure Side (2) HI Pressure Side
(1) LO Pressure Side (2) HI Pressure Side
(1) LO Pressure Side (2) HI Pressure Side
KiSC issued 05, 2012 A