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 Preventive Maintenance Checks and Services
Table 2-1.
Q - Quarterly
S - Semiannually A - Annually
D - Daily W - Weekly M - Monthly
Items To Be
Interval
Item
Procedures
Inspected/
No.
D
W
M
Q
S
A
Serviced
CONTROL CENTERS/SWITCHBOARDS - CONT
(S) Check contact condition and depression.
87
Ship
q
Service/Emer-
(4) Check latch engagement.
gency
Switchboard
(5) Check operation of tripping devices, including
Draw-Out
overcurrent trip devices, making sure all have
Circuit
positive tripping action (discernible) movement in
Breakers -
CONT
tripping direction beyond point of tripping),
c. Lubrication.
(1) Circuit breakers require very little lubrication,
Bearing points and sliding surfaces should be
lubricated very lightly at the regular inspection
periods with a thin film of GE lubrication D50HD38
(Mobile 28). Hardened grease and dirt should be
removed from latch and bearing surfaces by the use
of safe cleaning solvent such as kerosene. Latch
surfaces should be left clean and dry and not be
lubricated.
NOTE
All excess lubricant should
be removed with a clean cloth
in order to avoid any
accumulation of dirt or dust.
d.
At each maintenance period, all silver to silver
friction points, such as primary disconnects, should be
cleaned and given a fresh coat of GE lubricant DSOHD38.
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