Case CX235C SR Operator's Manual page 256

Crawler excavator
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Checking the charge state of the system
1. Turn on the air conditioning system, increase engine
speed slightly (1400 to 1600 rpm) and look for bubbles
through the sight glass.
2. This check should be made approximately one minute
after turning on the air conditioning.
(A) Very few bubbles observed, then transparent at first,
then whitish: "Normal".
(B) The bubbles are numerous: check the unions and
consult your CASE CONSTRUCTION Dealer.
(C) No bubbles are visible: check the unions and consult
your CASE CONSTRUCTION Dealer.
3. Check if the air-conditioning line and hose connectors
are dirty or dusty and clean them if necessary.
6 - MAINTENANCE
6-72
5
REE1U2-001
6
REE1U2-005
7
REE1U2-003

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