20 - 3
Air Conditioning
Condenser Coil
It is likely that over a period of time, because of the
machine's working environment, the airflow around the
condenser coil will become restricted due to a build up of
airborne particles.
If the build up of particles is severe, heat dissipation from
the refrigerant to the air will be significantly reduced,
resulting in poor air conditioning performance.
In extreme cases, over pressurisation of the system occurs,
causing the high pressure cut out switch to operate and
switch off the system.
High pressure cut out can also be caused by an internal
blockage of the condenser coil.
Condenser Coil Cleaning
Take care not to damage the condenser fins or tubes.
Damaged fins must be straightened out to ensure a good
airflow through the coil.
1 Park the machine on firm level ground. Raise and block
the loader arms. Lower the backhoe to the ground and
stop the engine.
2 Remove the starter key.
3 Remove the front grille.
4 Remove both side panels.
5 Support the condenser 1.
6 Undo the nuts and bolts 2 at the three mounting
brackets 3.
7 Remove the screws 4 fixing the condenser to the
mounting brackets. Remove the brackets 3 to enable
the condenser to be moved away from the radiator.
This can be done without removing the hoses i.e. with
the system fully charged.
8 With the condenser fully supported, use compressed
air or low pressure water to backflow through the coil
fins. Take care not to damage the fins.
9 Refit the condenser coil by reversing the removal
procedure. Refit both side panels and bonnet.
10 Run the air conditioning and check cooling
performance.
Section B Body & Framework
9803/7130
Section B
20 - 3
Issue 1
Service Procedures
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