How to Remove and Install JCB 520 Excavator Blower Unit

The blower W is located inside the HVAC/air conditioning unit and can be removed without having to remove the HVACunit from the machine

The only user-serviceable part is the resistor which determines the blower motor speed. Other faults, excluding wiring faults, necessitate the replacement of the blower unit complete.

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Resistor replacement requires the removal of the blower unit as follows:

Removal Disconnect the battery.

Gain access to the HVAC unit by removing the right hand side console and remove the HVAC unit top cover,refer to HVAC/ Air Conditioning Unit - Removal and Replacement Steps 2 and 3.
Disconnect the electrical connections to the blower.
Remove the screws securing the blower unit to the HVAC unit housing.
Carefully withdraw the blower from the HVAC unit.
To remove the resistor, disconnect the electrical connections and unscrew the resistor. Replacement is the reverse of the removal procedure

Freeze Protection Thermostat
- Removal and Replacement
The Thermostat V monitors the external temperature of the evaporator and is located inside the HVAC/air conditionig unit.
Removal
1
Disconnect the battery.
Gain access to the HVAC unit by removing the right hand side console and remove the HVAC unit top cover, refer to HVAC/ Air Conditioning Unit - Removal andReplacement Steps 2 and 3.
Unclip the sensor wire from the evaporator and gently remove the wire from between the fins.
Disconnect the electrical connections to the thermostat.
Remove the screws securing the thermostat to the HVAC unit housing.
Replacement is the reverse of the removal procedure.


Evaporator Matrix
- Removal and Replacement

Note: Before removing the Evaporator Matrix, discharge the system.
Refer to Conditioning - Refrigerant Charging and Discharging. The evaporator matrix S is located inside the HVAC/air conditioning unit and can be removed without having to remove the HVAC unit from the machine.
Removal
Removal of the evaporator matrix will require the assistance of a refrigeration engineer or suitably trained person since the refrigerant needs to be drained from the system.

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Disconnect the battery.
Gain access to the HVAC unit by removing the right hand side console and remove the HVAC unit top cover, refer to HVAC/Air Conditioning Unit - Removal and Replacement Steps 2 and 3.
Unclip the thermostat evaporator and gently remove the wire from between the fins.

The air conditioning system is a closed loop system and contains pressurised refrigerant. No part of the system must be disconnected except by a refrigeration engineer or suitably trained person. You can be severely frostbitten or injured by escaping refrigerant
Drain the refrigerant from the unit and remove all pipe work (refrigerant and air) which will prevent the unit from being withdrawn from the machine. Check around the top of unit, rear, bottom and right side.
5
Carefully lift the evaporator matrix complete with expansion valve T from the housing, bearing in mind that a certain amount of resistance will be met due to the stiction from the sealing putty. Replacement is the reverse of the removal procedure.

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