NOTE
A shop cloth should be used to divert escaping refrigerant when
disconnecting the charging hose from the Schrader valve. Recap the valve.
14-17. ADDITION OF PARTIAL CHARGE TO SYSTEM. It is possible to top off this system with refrigerant
by the following method.
a.
Remove the access panel at the rear of the cabin.
b. Connect a charging hose to a refrigerant cylinder and also to the Schrader valve fitting on the
suction line. (Refer to Figure 14-8.)
c.
Purge the charging hose by allowing a small amount of refrigerant gas to escape at the Schrader
valve fitting.
d. Start the engine and operate at 1000 rpm and turn the air conditioner on maximum cool.
e.
Remove the plastic plug from the sight glass in the top of the receiver-dehydrator.
f.
With a low refrigerant charge in the system, bubbles will be seen passing thru the sight glass when
the system is operating.
g. Open the valve on the refrigerant cylinder.
h. Allow refrigerant to flow into the system until the bubbles disappear from the sight glass.
i.
Close the refrigerant valve and check to see that the sight glass remains clear during system
operation.
j.
When the sight glass stays clear of bubbles, add an additional 1/4 pound of refrigerant to the
system. (Engine should be operating at 1000 rpm.)
NOTE
This should be done with OAT at 70°F, or higher, with the air conditioner
operating.
k. Shut off the air conditioner and engine. Remove the charging hose from the Schrader valve with
care due to refrigerant remaining in the line.
1. Replace the access panels.
14-18. COMPRESSOR SERVICE. It is not advisable to service the compressor in the field. It should be done
by a qualified shop which has the special equipment and trained personnel required to properly service the
unit.
Maintenance of the York unit and its related components is limited to the replacement of worn drive belt
and magnetic clutch Any other service requires removal of the compressor from the system. Maintenance to
the Sankyo compressor is limited to replacement of worn drive belt. Contact Sankyo International, 3529 Miller
Park Drive, P.O. Box 2903, Garland, Texas 75042 for special tools and instructions for detailed compressor
maintenance.
NOTE
An important factor in air conditioning servicing is cleanliness and care
should be exercised to prevent dirt or foreign material from entering the
system. All hose and tubing ends should be capped immediately. Any
lubrication required in the assembly of the components should be
refrigerant oil of the type used in the compressor.
Revised: 2/13/89
3A21
CHEROKEE ARROW III SERVICE MANUAL
ACCESSORIES AND UTILITIES
Summary of Contents for ARROW III
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