Page 44 I.B. 3A74792H08
Effective 09/2014
6-11 LUBRICATION
All parts that require lubrication have been lubricated
during the assembly with molybdenum disulphide grease
(Eaton Material No. 53701 QB). Over a period of time, this
lubricant may be pushed out of the way or degrade.
Proper lubrication at regular intervals is essential for
maintaining the reliable performance of the mechanism.
Once a year or every 500 operations whichever comes
first, the circuit breaker should be relubricated. The
locations shown in Figure 6-1 should be lubricated with a
drop of light machine oil.
After lubrication, operate the circuit breaker several times
manually and electrically
Roller bearings are used on the pole shaft, the cam shaft,
the main link and the motor eccentric. These bearings are
packed at the factory with a top grade slow oxidizing
grease which normally should be effective for many
years. They should not be disturbed unless there is
definite evidence of sluggishness, dirt or parts are
dismantled for same reason.
If it becomes necessary to disassemble the
mechanism, the bearings and related parts should be
thoroughly cleaned. Remove old grease in a good
grease solvent. Do not use carbon tetrachloride.
They should then be washed in light machine oil until
the cleaner is removed. After the oil has been drawn
of, the bearings should be packed with Eaton Grease
53701QB or equivalent.
Table 6.4 Approximate Resistance Measurements
Rated Continuous
Current (amperes)
Resistance
(microohms)
600A
1200A
1600A
2000A
31.5KA 2500A
40 KA 1200A
40 KA 2000A
40 KA 2500A
92
90
88
72
52
58
55
52
6-12 TROUBLESHOOTING CHART (Continued Next Page)
SYMPTOM INSPECTION AREA PROBABLE DEFECTS
Fails To Close
• Closing Springs not charged
• Control Circuit
• Control Power
(fuse blown or switch off)
• Secondary Disconnects
• Motor Cut-off Switch
(Poor or burned contacts,
Lever not operational)
• Terminals and connectors
(Poor or burned contacts)
• Motor
(Brushes worn or commutator
segment open)
• Mechanism
• Pawls
(Slipping or Broken)
• Ratchet Wheel
(Teeth worn or broken)
• Cam Shaft Assembly
(Sluggish or jammed)
• Oscillator
(Reset spring off or broken)
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