Hobart 5359D Operation And Maintenance Manual page 129

OM 2012
(b) If the overfrequency system functicns to open the (cad contcctor and turn
on the overfrequency light after some frequency between 415 Hz und 425
Hz is reached, all components of the system are functioning
prOpCi4y.
If
the load contactor is not opened within the above frequency rcnge, tefer
to Trouble Shcoting Chcrt to determir;e which
compc~ent i; defc.st-lve.
(42) if the generctor is operating under load at this point, place the contircior
control switch (20, Fig. 2) in OFF position
to ok* q-n load co.ntactor c?nd disconnect
load. There wifl be no further need for the load bank in the following checks .
4
(43)
With the engine running at normal governed speed, check ihe entire unit for
vibration and for any parts which may have become loosened during the above
checks. Tighten any locse citaching ha.rdware a; required.
(44) Check &O-Hz generator hecrings.
USC a stethoscope or metcl sounding rod
to listen for unusual noises. If using a metal rod, place one end on the gen-
erator housing and hold the other end near the ear.
Hold the rod with three
fingers one! use the indes finger ard thumb to form a "sounding chamber"
z between the rod and the ear. Do NOT allow the rod to touch the ear.
Listen
for "grinding" or pounding. sounds which would indicate a defective bearing.
An engine noise may be "telegraphed" to the generator and misinterpreted as
a generator noise. Send the unit to overhcul if in doubt of bearing setvice-
ability.
WARNiNG: IF A METAL SOUNDING ROD IS USED TO DETECT BEARING
NOISES, EXERCISE EXTREME CARE TO AVOID INJURY.
4. Generator Set Adjustment
A. Generator Adjustment
The 400-Hz generator is a brushless type requiring no adiustments of any kind.
B. Generator Control Adjustments
The following items may require adjustment at some time during the life of the
ea LJ inme nt .
Au3 25'85
2-3
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