Opel 1900 1973, Service Manual, Page: 551 / 625

1973 OPEL SERVICE MANUAL
SCHRADER VALVE
ADAPTER J-5420
C O
M P R E S S O R
VIEW)
/ - - D I S C H A R G E L I N E
LOW PRESSURE
GAUGE
MANIFOLD AND
-GAUGE SET
J-5725-01
LINES
(5) J-5418
Figure Set-Up For Discharging System
tion. With the gauge disconnected from the refrigera-
tion system, be sure that the pointer indicates to the
center of zero. Lightly tap gauge a few times to be
sure pointer is not sticking. If necessary, calibrate as
follows:
A. Remove cover
from
gauge.
B. Holding gauge pointer adjusting screw firmly with
one hand, carefully force pointer in the proper direc-
tion in proper amount to position pointer through
the center of
position. Tap gauge a few times to
be sure pointer is not sticking. Replace gauge cover.
2. If gauge is not already connected to compressor,
connect as follows:
A. Close hand shut-off valves on gauge set by turning
clockwise.
B. Remove caps from gauge fittings on the compres-
sor adapter fitting.
C. Attach valve adapter (J-5420) to end of the hose
from the low pressure gauge and connect this
fitted hose to suction gauge fitting.
D. Attach valve adapter (J-9459) to end of hose from
the
high pressure gauge and connect this adapter
fitted hose to the discharge fitting.
3. Attach a flexible gauge hose to center fitting of
the gauge set and attach the other end of this hose
to vacuum pump (J-5428-03).
Evacuating Complete System
1. Turn hand shut-off valve on low pressure gauge
of gauge set to full clockwise position.
2. Slowly turn valve on high pressure gauge coun-
terclockwise from full clockwise position, letting any
pressure build-up escape completely. Close high
pressure valve.
3. Check oil level in vacuum pump and, if neces-
sary, add refrigeration oil. Make sure dust cap on
discharge side of pump has
been
removed.