Maintenance and Care

Maintenance and Care
8.6 Heating/Air conditioning
With few exceptions, the heating and air conditioning system does not require
any maintenance. To ensure the fault-free operation and maximum performance
of the system, depending on dust concentration levels, the intake
air must be flushed out of the air channel in the intake port at least every 500
operating hours. The intake air flow will be reduced dramatically if the filter
elements are excessively dirty, considerably affecting heating and cooling
performance. The filter element is easy to maintain and can be accessed
from the left-hand side of the machine by removing the intake port.
1. Tilt the cab.
2. Remove the intake port.
3. Clean the air filter with compressed air and the filter housing with a soft
cloth.
4. Mount the intake port.
5. Lower the cab.
8.6.1 Coolant
The air conditioning system coolant circuit contains approx. 750 g of coolant. The manufacturer designation of
the coolant used, which is a tetra-fluoro-ethane compound, is R134a. Unlike the compounds used in the past, like
R12, which were composed of fluorine, chlorine, carbon and hydrogen, this coolant meets the conditions and requirements
of a modern environmentally-friendly coolant. However, guidelines governing the use of such coolants,
which are designed to protect health and the environment, must be observed.
8.6.2 Filling
The system is filled before leaving the factory. Special equipment and expert knowledge are required to fill the system
correctly. We recommend that the fill level is checked every 2 years by a specialist operator or a Menzi Muck
Service Centre or service engineer.
8.6.3 Cooling oil
In this case too, the system is filled to the correct level before leaving the factory. Do not open any couplings on
the compressor to avoid the risk of coolant leaking. The correct fill level or residual amount of compressor oil is
checked by Menzi Muck engineers during servicing. However, should you need to top up the compressor oil, you
should only use PAG diester oils. The oil used must be able to combine with the coolant in order that even system
components which are separate from the compressor, in particular the expansion valve and binary pressure
switch, can be lubricated.
8.6.4 Repairs to the coolant circuit
Should repairs need to be made to the coolant circuit, please contact one of our Service Centres or a specialist
operator in your area. You should never make modifications to or carry out repairs on the coolant circuit. If the
coolant heats up, as is the case during soldering and welding, it decomposes and produces extremely poisonous
gases and vapours. Decomposition products are also very aggressive.
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