Case 580SR Service Manual page 768

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8
Electrical heater valve
The electrical valve is equipped with a software that,
each time the supply of the cock is delayed (there-
fore also at backhoe loader start), carries out the mo-
mentary positioning of the cock to "completely
closed" and returns to the position set by the temper-
ature regulation handle located on the control dash-
board. This enables the software to carry out a self-
control on the cock drive so as to always obtain an
optimal regulation of the ball for the water flow.
This is part of the cock normal operation and is not to
be considered as a fault.
Release of the electrical heater valve
IMPORTANT: the release of the valve has to be per-
formed if this valve remains idle for long periods.
Carry out this operation observing the following pro-
cedure:
Z Disconnect the electrical connectors (1).
Z Loosen the screws (2) and take out the electrical
valve (3) from the evaporator.
Z Loosen and remove the screws (4).
Z Separate the driving unit (5) from the cock (6).
Z By means of a wrench turn pin (A) of the cock so as
to unlock it.
S
WARNING
Once this operation is complete, reset pin (A) in the
correct start position.
Reinstall the heater valve, repeating the previous
operation in the reverse order.
SECTION 50 - CAB HEATING AND AIR CONDITIONING
1 2
A
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4
F30059
5
6
F30060