Zetor UTILIX HT 45 Operator's Manual page 111

1. Checking the air conditioning system.
1 - Economic friendly refrigerant : R134a 0.7~0.85 kg.
The presence of air and water in the system could jeopardize its efficiency.
- The air is uselessly compressed by the compressor and no cooling effect is produced.
- The moisture has a tendency rise to obstructions which prevent the cooling efficiency.
2 - Check belt tension ; when finger pressure is applied to the mid-point between both pulleys.
3 - Condenser fins must always be duly clean using water or an air set.
2. Checking the air conditioning system charge
(1) Check the refrigerant charge.
A. Run the engine at 1500 rpm.
B. Set the air conditioning system in the coldest for 5 minutes.
C. Check sight glass for clear sight or cloudy.
Caution: If the air conditioning system is operated without being charged, The lubrication in
the compressor can cause damage.
3. Diagnosing malfunctions
(1) Tracing faults
SYMPTOM
Abnormal sound
Abnormal revolution
1.Compressor
Refrigerant or oil
leakage
Excessivepressure
CABIN
CONDITION CAUSE
Insufficient Lub.
Belt tension release
Inlet sound
Outlet sound
Release the bracket
Clutch fail
Damaged parts
Inlet cause Slip the clutch
Not Lub.
Outlet cause Belt tension released
Sealing washer
damaged
Refrigerant or oil
leakage
Head bolt released
D-ring damaged
Insufficient refrigerator
Low, High
pressure
Compressor
110
REMEDY
Replenish
Adjust
Tighten the bolts
Check
Check, replace
Check, replace
Replenish
Adjust
replace
Tighten the bolts
Replace
Adjust
Replace