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TRUCK SERVICE MANUAL
TM 5-4210-230-14&P-1
BODIES AND CABS
Portable Air Conditioning Service Station
The SE-2443 Portable Air Conditioning Service
Station (Fig. 32) consists of Manifold Gauge Set (SE-2444),
Service Hose Set (SE-2445), High Vacuum Pump (SE-2446)
and High Vacuum Meter Kit (SE-2447) mounted on a
convenient cart. Space is also provided for mounting the
Heated Charging Cylinder (SE-2448).
Fig. 32 Portable Air Conditioning Service Station (SE-2443)
MAINTENANCE OPERATIONS
PRE-SEASON CHECKS
Experience has shown that many problems incurred
with heating and air conditioning systems result from lack of
regular maintenance. Complete pre-season check outs of
heating and air conditioning systems will aid in obtaining
satisfactory performance during the operating seasons. Pre-
season checks should be performed as outlined below.
With Heater Only:
1.
Check unit mountings for looseness.
2.
Check condition and tension of all drive belts.
3.
Check cleanliness of coolant. Clean cooling system
if necessary and add new coolant.
4.
Check to see that radiator core fins are not plugged
with bugs or leaves, etc.
5.
Check heater core fins for lint or other material that
could restrict air flow.
6.
Check adjustment of control cables. (See "Control
Cable Adjustment" under Service Operations.)
7.
Check operation of blowers. Clean blower wheels if
necessary.
8.
Check water control valve adjustment.
9.
Check cooling system shutter operation (where
equipped).
10.
Check condition of heater hoses and engine cooling
system hoses. Replace if necessary.
With Heater and Air Conditioner:
1.
Perform pre-season check of heater portion of
system as outlined above under "With Heater Only".
2.
Check compressor belt alignment and tension. (See
"Compressor Belt Tension Check".)
3.
Check condition of refrigerant hoses and tubing.
Look for cracks, chafing or other damage and
replace as needed. Inspect all tubing and hose
connections. All connections must be clean and
tight.
4.
Install new air filter. (See "Air Filter Replacement".)
5.
Clean condenser, radiator, evaporator core and
blowers of all dirt, lint or other foreign material.
Cleanliness
of
these
components
cannot
be
overemphasized. Lack of proper attention in this
area is one of the major causes of unsatisfactory unit
operation. As often as necessary, squirt water
through condenser towards radiator and through
radiator towards condenser to flush debris out of fins.
Do not cover the condenser with a screen wire.
6.
Operate air conditioning system with controls set for
maximum cooling (A/C lever on "COLD", blower
switch on "HIGH") for about five (5) minutes.
With system operating:
CTS-2731 Page 18
PRINTED IN UNITED STATES OF AMERICA
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