SAME SILVER 100.4 - Page 375

Diagnosing malfunctions
LOW PRESSURE CIRCUIT
excessive pressure
normal pressure
excessively low
pressure
system fails
to operate
poor system
efficiency
excessive pressure
in the high pressure
circuit
too a low pressure
in the high pressure
circuit
excessive pressure
in the high pressure
circuit
normal pressure in
the high pressure
circuit
normal pressure in
the high pressure
circuit
low pressure in the
high pressure cir-
cuit
burnt fuse
disconnected wires
coolant leaks
compressor not
operating smoothly
pressures inside
both high and low
pressure circuits
tend to balance
bubbles are visible
through the filter in-
spection glass
poor system effi-
ciency
after some working
time
expansion valve
jammed up
blocked circuit
discharged system
replace the fuse
connect the wires
inspect with a leak-
finder
overcharged circuit
expansion valve
jammed up
air in the circuit
Out-of-setting com-
pressor needle
valves
humidity inside the
circuit
replace the expan-
sion valve
change the part and
replace the filter
recharge system
stop the leakage
and recharge the
system
release system
pressure through
the compressor
needle valves
replace the valve
dehydrate the cir-
cuit
replace the valves
replace the filter and
bleed the air. Re-
charge the circuit
systems
cab environment control
8
375
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