Komatsu WA500-6H, Operation & Maintenance Manual

Page: 298 / 412

4.9 Service procedure
When required
Maintenance
4-44
WA500-6H – VEAM430100
Check air conditioner
Check level of refrigerant (gas)
WARNING
If the refrigerant of the conditioner system gets into your eyes or
on your hands, it may cause loss of sight or frostbite. Do not
touch the refrigerant. Never loosen any part of the refrigerant
circuit.
Do not bring any flame close to any point where the refrigerant
gas is leaking.
If the cooling effect of the air conditioner is poor, there may be
lack of refrigerant (gas).
In this case, check sight glass (2) of receiver drier (1) on the
right inside of the engine side cover.
Before carrying out inspection, set to the following conditions.
z
Start the engine and run it at approx. 1,500 rpm.
z
Turn the air conditioner ON/OFF switch to the ON position.
z
Set the air flow to the maximum position.
z
Set the temperature to the lowest position.
z
Open the doors and windows fully.
z
Turn the air conditioner switch ON.
If the condition of sight glass (2) is “correct“ as shown in the dia-
gram on the right, the condition is normal. (After the air condi-
tioner switch is turned ON, a small number of bubbles will be
seen, but after that, the fluid becomes a transparent, milky white
color.)
If the condition of sight glass (2) is “insufficient“ as shown in the
diagram on the right, there is lack of refrigerant, so ask your
KOMATSU distributor to charge with refrigerant. (After the air
conditioner switch is turned ON, bubbles can be seen continu-
ously.)
(A) Bubbles mixed with liquid refrigerant
(B) All refrigerant is clear liquid
(C) Oil and refrigerant are separated; liquid is thin milky white
GK050202
GK050207
2
1
Condition in sight glass Refrigerant
Correct
Insufficient