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TRUCK SERVICE MANUAL
TM 5-4210-230-14&P-1
BODIES AND CABS
4.
Remove dipstick and measure wetted portion to
determine oil level in compressor. Compare oil level
reading
with
specified
oil
level
listed
in
SPECIFICATIONS.
If necessary, add refrigeration oil to obtain specified
level. (Refer to SPECIFICATIONS for oil type.)
If oil level is higher than specified, draw out excess
oil to obtain correct level.
After establishing correct oil level, reinstall oil fill plug
and gasket. Tighten plug to torque value listed in
TORQUE CHART
Reinstall compressor on engine, if removed.
EVACUATING THE AIR CONDITIONING SYSTEM
Whenever the air conditioning refrigerant system has
been opened, it is necessary that the system be completely
evacuated of air and moisture before being recharged.
Outlined below is the procedure for evacuating the
system using the SE-2443 Portable Service Station.
1.
Connect SE-2443 Service Station to air conditioning
system service ports as follows:
a.
Close all valves on service station (turn fully
clockwise).
b.
Connect suction gauge hose to compressor
suction service port.
c.
Connect discharge gauge hose to compressor
discharge service port.
d.
Connect hose from center fitting on manifold
to vacuum pump suction fitting on service
station.
e.
Open manifold suction and discharge gauge
valves (turn fully counterclockwise).
2.
Start vacuum pump and SLOWLY open pump blank
off valve.
3.
After suction gauge on manifold shows that vacuum
is being established in the system, open vacuum
gauge valve on service station and continue to
operate vacuum pump for ten (10) minutes.
4.
Close pump blank off valve and observe electronic
vacuum gauge for one (1) minute. The meter should
not indicate a rise of more than 5 millimeters of
mercury. If gauge rises more than 5 millimeters of
mercury in one (1) minute, system has a leak which
must be repaired.
5.
Open pump blank off valve and continue to operate
vacuum pump for an additional twenty (20) minutes.
Then close pump blank off valve and observe
electronic vacuum gauge. If meter reading stays
below 4 millimeters of mercury for two (2) minutes,
system is ready to be charged.
6.
With vacuum pump still operating, close both
manifold gauge valves, pump blank off valve and
vacuum meter valve. Turn off vacuum pump.
Do not disconnect manifold gauge hoses from
compressor service ports prior to charging the
system.
CHARGING THE AIR CONDITIONING SYSTEM (FULL
CHARGE)
In preparation for charging, the air conditioning
system must be evacuated of all air and moisture and be
completely leak free. (See "Evacuating the Air Conditioning
System".)
To charge the system, utilizing the SE-2443 Portable
Service Station and SE-2448 Heated Charging Cylinder,
proceed as follows:
1.
Manifold suction and discharge gauge hoses remain
connected
to
compressor
service
ports
from
evacuating operation.
2.
Fill SE-2448 Charging Cylinder with 2.25 kg (5 lbs.)
of refrigerant. (Follow equipment manufacturer's
instructions.) Make sure all valves on charging
cylinder are closed after filling.
3.
Connect service hose from center manifold fitting to
bottom valve on charging cylinder.
4.
Open bottom valve on charging cylinder and loosen
center hose connection at manifold for 10 seconds,
or until hose fitting becomes cold, to purge air from
hose; then tighten hose connection.
5.
With the engine shut off, open manifold discharge
gauge valve and fill air conditioning system with 2 kg
(4.5 lbs.) of refrigerant. (Follow charging cylinder
manufacturer's instructions.)
DO NOT overcharge the system. Excessively high
head pressures during operation will result from
overcharging.
6.
When system is fully charged, close manifold
discharge valve and bottom valve on charging
cylinder. Slowly loosen hose connection at bottom
valve on charging cylinder and allow refrigerant
pressure to bleed off; then disconnect hose from
valve.
CTS-2731 Page 23
PRINTED IN UNITED STATES OF AMERICA
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