23
(4)
CLOSE LEVER PIVOT.
(5)
HOLDING PAWL PIVOT.
(6)
DRAWOUT MECHANISM.
(7)
THRUST BEARINGS ON THE DRAWOUT SCREW SHAFT.
(8)
DRAWOUT GATE PIVOT.
ON ELECTRICALLY OPERATED BREAKERS, ALSO OIL THE FOLLOWING:
(9)
DRIVING PAWL
(10)
SPRING LIMIT SWITCH LEVER PIVOT.
(11)
ON 14" FRAME BREAKERS, THE TOP PIVOT OF THE CHARGING
CAM.
APPLY A LIGHT WIPE OF PJC-8311 GREASE TO THE FOLLOWING
POINTS:
(12) SLOTS FOR THE SPRING GUIDE PIN.
(13) RATCHET WHEEL TEETH.
(14) DRAWOUT SCREW SHAFT.
(15) CONTACT SURFACES Of THE MAIN DRAWOUT CONTACTS.
(16) CONTACT SURFACES Of THE SECONDARY DRAWOUT CONTACTS.
(17) GROUND CONTACT.
(18) CLOSING SHAFT SUPPORTS.
(19) DRAWOUT WHEEL BEARING.
ON ELECTRICALLY OPERATED BREAKERS, ALSO GREASE THE
FOLLOWING:
(20) THE SLOT ON THE RIGHT SIDE OF THE OSCILLATING LEVER
(AT THE MOTOR).
INDEPENDENTLY AND EACH HAS EVEN SPRING PRESSURE. LOOK FOR
SIGNS OF OVERHEATING ON THE INSULATING SPACERS BETWEEN
WAFERS, ON THE WAFER SPRINGS AND ON THE MOLDED SPRING
HOLDERS.
GENERALLY SIGNS Of OVERHEATING ON THE MOVING CONTACT
ASSEMBLY INDICATES A HIGH RESISTANCE ACROSS THE MAIN
CONTACTS OR INADEQUATE CONTACT PRESSURE.
9. CLEAN THE CLOSING AND DRAWOUT MECHANISM.
REMOVE ANY ACCUMULATED DIRT AND GREASE FROM THE
CLOSING MECHANISM. THE USE OF CLEANING SOLVENTS IS
DISCUSSED IN THE FOLLOWING SECTION.
ALSO CLEAN THE DRAWOUT MECHANISM. INSERT THE DRAWOUT
CRANK AND TURN IT CLOCKWISE TO STOP, CLEAN OFF THE GREASE
FROM THE SCREW SHAFT, THEN CRANK IT ALL THE WAY BACK, AGAIN
CLEANING THE GREASE OFF.
10. CHECK TRIP LATCH
CHECK THE MOVEMENT OF THE TRIP SHAFT AND CLOSING
MECHANISM. ROTATE THE TRIP SHAFT BACK AND RELEASE IT. IT
SHOULD ROTATE FREELY AND SPRING BACK TO POSITION. CHECK THE
CLOSING MECHANISM BY PARTIALLY CHARGING THE MAIN SPRING
JUST TO THE POINT WHERE THE TRIP LATCH BEARING HITS THE CLOSE
LATCH AND BEGINS TO ROTATE IT BACK. AT THIS POINT THE SPRING IS
ONLY PARTIALLY CHARGED . IT IS HELD IN PLACE BY THE HOLDING
PAWL AND CONTACTS CANNOT BE CLOSED WITHOUT FURTHER
CHARGING THE SPRING. PUSH THE TRIP LATCH BEARING FORWARD
AND RELEASE IT. THE LINKAGE SHOULD MOVE FREELY AND SPRING
BACK TO ITS ORIGINAL POSITION. FOLLOWING THIS, COMPLETE THE
CHARGING STROKE, CLOSE, THEN TRIP THE BREAKER.
IF THE TRIP SHAFT OR MECHANISM SHOWS RESISTANCE TO
MOVEMENT
OR
IF THE MECHANISM IS VERY DIRTY, IT MAY REQUIRE
CLEANING WITH A SOLVENT. BE SURE THE SOLVENT LEAVES NO
RESIDUE AND WILL NOT AFFECT THE PLASTICS, OR OTHER MATERIALS
IN THE BREAKER. BE CAREFUL THAT THE CLEANER DOES
NOT CONTACT ANY MOLDED PLASTIC PARTS, IN PARTICULAR, THE
SECONDARY DRAWOUT CONTACTS OR THE ANTI-SINGLE-PHASE UNIT
ON HL-3 BREAKERS. THIS LAST DEVICE WOULD BE BEST COVERED OR
EVEN REMOVED IF CLEANING THE MECHANISM WITH SOLVENTS.
11. CHECK CLOSE LATCH
CHECK THE SECURITY Of THE LOCKNUTS ON THE CLOSE LATCH
ADJUSTING SCREWS. If THESE ARE LOOSE, CHECK CLOSE LATCH
ADJUSTMENT (SECTION 8.2). USING THE MANUAL CLOSE BUTTON OR
CLOSE LEVER, OPERATE THE CLOSE LATCH. IT SHOULD MOVE DOWN
FREELY AND SPRING BACK TO ITS UPPER POSITION.
12. LUBRICATE THE BREAKER
REFERRING TO THE ACCOMPANYING FIGURES RE-LUBRICATE THE
BREAKER. APPLY
PJC-8311
OIL TO THE FOLLOWING PARTS:
(1) ALL LINKAGE PIVOTS WITHIN THE MECHANISM.
(2)
CLOSING AND DRAWOUT SHAFT BEARINGS.
(3) CLOSE LATCH PIVOT.
FIG 7.3.12.1 LINKAGE LUBRICATION
