OP-755 Part 2 Pages 197-401 - Personal Page of GENE SLOVER

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if necessary. Furthermore whenever such filter evidence is
apparent, the system must be drained and flushed clean.
14. Hydraulic systems which are not self-venting must
be vented periodically. Air in a system is invariably apparent
as the cause of noise in pump, motor or pressure pipe line;
and, as the cause of irregular operation.
15. Hydraulic systems which perform satisfactorily and
which show no evidence of sludge, rust, etc. ,should not be
opened; - all cover nuts should be kept tightly secured to
discourage removal without good reason.
16. Systems which are operating unsatisfactorily and
for which the trouble and correction cannot be ascertained,
must not be operated, except in emergency, until replacement
can be made or until a representative of the manufacturer can
be obtained to make correction. In the event t~atitis deemed
advisable to request a service engineer from the manufacturer,
it is esserrt.i a.L: tha t the request be accompanied by complete
report as to the abnormal characteristics; .if parts are
damaged, explain the phase of operation inwhich·the cas1:lalty
occurred. Such report will facilitate restoring equipment to
service.
17. Whenordering replacement parts for hydraulic equt pment
give the manufacturers piece number (from the piece), the
Ordnance number (from the drawing), and the name of· the part
or a description of it. Inspect mating or attached parts for
evidence· of damage; order repl,acement parts, similarly, if
t~ey are required.