Kubota KX080-4 Workshop Manual page 476

KX080-4, WSM
Checking with the sight glass
Conditions
Doors
Inside/outside air switch
Ambient air temperature
Engine RPM
Temperature control
Blower switch
Criteria
No air bubbles at all in the flow. In this case, both high
(a) Overcharged and low-pressure sides are at high pressure and the
cooling is ineffective.
Almost no air bubbles in the flow. If the engine rpm is
Normal
(b) raised gradually from idle to 1500 rpm, the air bubbles
amount
disappear and the flow becomes transparent.
(c) Undercharged Air bubbles flow past constantly.
(1) Sight Glass
5-S19
All open
Inside
30 to 35 °C (86 to 95 °F)
About 1500 rpm
Max cooling position
HI
RY9212001CAS0034US0
KiSC issued 08, 2015 A
CABIN