Specifications

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2.4 — Service Procedures
The service section covers replacement of valve plates
and gaskets, service to the bearing head assembly
containing the oil pump, and a clean-up procedure to
follow in case of motor burn out. Most other internal
service requires replacement of the compressor.
REMOVE, INSPECT AND REPLACE CYLINDER
HEAD AND VALVE PLATE ASSEMBLY
To test for leaking discharge valves or blown cylinder
head or valve plate gaskets:
1. Pump compressor down.
2. Observe suction and discharge pressure equalization.
If valves are leaking or a gasket is blown, the
pressure will equalize rapidly.
Maximum allowable discharge pressure drop is 3 psi
per minute after initial drop of 10 to 15 psi in first
half minute.
New reed valves may require 24 to 48 hour run-in
time to seat completely.
A compressor bank (head) with a blown gasket can
also usually be detected by touch since the head
temperature will normally be much hotter than a bank
with good gaskets.
3. If there is an indication of loss of capacity, and
discharge valves are functioning properly, remove
valve plate assembly and inspect suction valves.
NOTE: This test procedure is not applicable to
compressors equipped with pressure actuated
unloader valves due to rapid pressure equalization
rate. Inspect suction and discharge valves by disas-
sembling valve plate.