Maintenance
Safety, Operation and Maintenance Manual - Aug 2012
5-52
SY115C9/135C/155H Crawler Hydraulic Excavator
5.8.2.9 Air conditioner - inspect/service
Always prepare your machine as required
and lock/tag it out before proceeding.
See
“Preparing the machine” on page 2-58 and
“Lock-out and tag-out” on page 2-60.
Checking refrigerant (gas) level
Insufficient refrigerant (R134a) will severely
impair the cooling performance.
When the engine is running at high speed, op-
erate the air conditioner for strong refrigeration
and observe through the sight glass (1) on the
condenser reservoir (2) in order to inspect the
condition of refrigerant gas
fl
owing to the tube.
●
The refrigerant flows without bubble: per-
fect
●
The refrigerant
fl
ow contains bubbles that
pass continuously: refrigerant level low
●
Colorless and transparent: no refrigerant
Remark:
The appearance of bubbles indicates low re-
frigerant level. Please consult Sany distributor
to add refrigerant. Running the air conditioner
with low refrigerant level could damage its
compressor.
Inspection during idle period
●
The refrigerant getting into your eyes
or on your skin can cause blindness
or freezing injury. Never touch the re-
frigerant. Never loosen any parts of the
refrigerant lines.
●
Keep any naked fire away from the
leaking position of refrigerant gas.
WARNING
CZ135B-1104010
1
2
CZ135B-1104011
OK
Insufficient
No refrigerant
(Colorless, transparent)
Fig. 5-44
Fig. 5-45