Zetor UTILIX HT Series Operator's Manual page 129

FAULT
Low pressure or
not working
2. Engine
Fan cannot be
operated
Noise
Disengagement
3. Clutch
Slippage
(2) How to check the air conditioning system with the needle of high low gauge
To connect with manifold pressure gauge can find the cause of air conditioning system.
Because manifold pressure gauge is various sensibly (Ambient Temp. is based on 30~35 °C)
Caution: Operating E/G RPM 1 500~2 000 is must, and so to that you can check the correct cause and air
conditioning. (In case below the figure of indicated pressure gauge has some clearance, confirm with
approximate indicated needle data.)
Gauge pressure conversion
2
lb/in =PSI
2
1 kg/cm =14.223 lb/in
(Ex) 200 PSI=14 kgf/cm
128
CABIN
SYMPTOM
Engine operation
normal
Engine operation is
not normal
Air leak
Engine
Irregular engine
operation
Regular noise
Irregular noise
Disengaged
occasionally
Always engaged
Press by hand
No wire defective
Slippage during
rotation
2
2
CAUSE
Air supply clogged
Evaporator freezes
Fan switch damaged
Compressor
Engine failure
Broken wire
Pipe leak
Pneumatic control switch
error
Engine failure
Collision with roller
Wire failure
Large clutch play
Low voltage
Malfunction
Low voltage
Clutch contaminated by
oil
Malfunction
SOLUTION
Remove
Adjust the minimum
pressure
Replace the switch
Replace
Replace
Replace
Check, tighten
Check, tighten
Replace
Check the position of
the compressor
Check the wire
Adjust
Check the battery
Replace
Check the battery
Clean
Replace