Operation and maintenance manual

Section 260-0130
SM 1405 Rev 2 11-04
7
Operators Compartment - Air Conditioning
MAINTENANCE
WARNING
Always wear goggles or glasses to protect your
eyes when working around R-134a. R-134a boils
at sea level temperatures of -29.8° C (-21.6° F),
which means that direct contact with your skin
will produce frostbite. Exercise extreme care
when handling R-134a. If R-134a contacts your
skin, wash immediately with plenty of warm
water. Remove any contaminated clothing with
caution as it may adhere to the skin. If
blistering or continued irritation occurs obtain
immediate medical attention.
WARNINGS
If you get the slightest trace of R-134a in
your eye, flood the eye immediately with cool
water; then treat with mineral oil or clear
petroleum jelly followed by boric acid rinse.
Report to a hospital or doctor as soon as
possible.
The chemicals of R-134a when burned
produce gases that will damage the respiratory
system if inhaled. NEVER SMOKE in an area
where R-134a is used or stored. Use hot water
or an approved heated charge cylinder as a heat
source if required to force R-134a into the
system. If using water, do not exceed 52° C
(125° F). Never use direct flame or electric
heaters in direct contact with the R-134a
container. High temperatures may result in
raising the pressure to a dangerous level.
1. Periodically clean the condenser coil of debris and
dirt using water or air pressure. A partially blocked
condenser coil can reduce the life of the compressor
belt and/or clutch.
2. If the system has a heater in the same location as
the air conditioning evaporator core, heater valves
should be closed.
3. To check the refrigerant level, run the engine at
1 200 rev/min with fans on high speed and thermostat
fully open for a minimum of five minutes. If the clutch is
engaged in this situation, there should be very few
bubbles visible in the receiver-drier sight glass.
Note: Unit can operate with some bubbles visible, but
not milky looking.
12. Fit compressor (12) to mounting bracket (19) and
secure with bolt (34), washer (23) and locknut (33). Do
not fully tighten at this stage.
Note: If fan guard, Poly 'V' fan belt and compressor
'V' belt (18) were removed, proceed with steps 11 & 12.
13. Install new 'V' belt (18) onto rear groove on engine fan
pulley and fit to rear groove on compressor (12).
14. Refit Poly 'V' fan belt and adjust tension. Refer to
Section 110-0030, ENGINE AND MOUNTING. Refit fan
guard and secure with mounting hardware as removed
during removal. Refer to Section 210-0040, RADIATOR
AND MOUNTING.
15. Install spacer (30) on adjuster block (25). Locate
adjuster block (25) through centre hole in adjuster
bracket (20) and secure in place with locknut (33).
16. Support compressor (12) and position eyelet of
adjuster rod (24) adjacent to lug on bracket (19) and
secure with bolt (28), lockwasher (27) and nut (26).
17. Adjust tension of compressor 'V' belt with nuts (26)
on adjuster rod (24) until there is approximately an
inward deflection of 10 mm (0.4 in) at the centre of 'V'
belt (18). Fully tighten all mounting hardware.
18. Remove caps from end of refrigerant hoses (6 & 7)
and ports on compressor (12) and connect hoses to
ports as tagged at removal.
19. Connect electrical connection to compressor (12)
clutch.
20. Secure all lines with clips and clamps as removed
during removal. Ensure no lines are chaffing on sharp
edges or resting against areas where heat will be
evident.
21. Charge the air conditioning system as described
under 'Charging Procedure'.
22. Switch the battery master switch to the 'On'
position, start up the engine and check for correct
operation of the air conditioning system.
24. Secure cover to air conditioner (1) outer box using
screws (2) and lockwashers (3). Lower hood assembly
and remove wheel chocks.