GE Industrial Solutions Power-Vac ML-20 Mechanism - Manual (Page 22)

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Perform the operation in the following sequence:
1. Charge closing spring and install gag plate.
2. Depress the close and then the trip buttons.
3. Pump the manual close handle 3 - 4 times.
4. With the 5/16” Allen wrench, remove the pivot bolt
(10, Figure 21) on the closing spring (1, Figure 21).
5. Remove the closing spring.
6. Disconnect the trip linkage tension spring.
7. Loosen the interlock bracket (11, Figure 21).
8. Remove the 4 bolts from the coil bracket leaving the two
bolts nearest the front of the breaker in place in the
mechanism frame.
9. Cut coil leads and remove the coil and armature.
To install the new coil, reverse the above procedure and
connect leads with insulated butt connectors. See TRIP COIL
PLUNGER in MECHANICAL ADJUSTMENTS section for
setting the stroke of the armature. Apply Loctite to the
threads of the pivot bolt (10, Figure 21) when it is replaced.
Charge the breaker and electrically close and trip it to make
certain it has been reassembled correctly.
14.7—Closing Coil Replacement
Disconnect the close linkage tension spring then remove the
retaining ring from the close linkage pivot pin (17, Figure 21)
and disconnect the linkage. Remove the closing coil and
housing (6, Figure 21). Cut the leads to the closing coil and
remove the coil. Reassemble the coil and housing with
armature and butt-splice the new coil into the wiring harness.
Reassemble linkage and spring. Readjust the closing coil
armature travel in accordance with instructions in
MECHANICAL ADJUSTMENTS section under CLOSE COIL
PLUNGER.
14.8—Auxiliary Switch Replacement
With the breaker open and the closing spring discharged,
remove retaining clip from auxiliary switch shaft. Observe and
make of the
direction of the index mark on the end of the shaft and the
position of the operating link in relation to the stop screw.
Remove mounting hardware securing auxiliary switch to
mechanism plate. Slide auxiliary switch and shaft out of
operating link. Before removing any wires from switch
terminals, make sure they are properly tagged with switch
terminal numbers to assure proper placement on new switch.
Remove wires.
To install new switch, attach leads then install switch. Install
switch shaft in operating link with index mark aligned as noted
above. Reverse above procedure to complete installation.
14.9—Motor Replacement
With the breaker open and the closing spring discharged,
remove auxiliary switch as described above but do not
disconnect leads. Move switch toward side of mechanism far
enough to clear motor and tie there temporarily. Disconnect
motor leads. Remove the long bolt and spacer securing the
motor to the mechanism mid-plate. Remove the two socket
head cap screws securing the motor to the mechanism top
plate using a 5/16” Allen socket and a 24” extension.
Disengage the motor output shaft from the charge linkage
arms and withdraw motor.
To install the new motor, reverse the above procedure.
14.10—“Y” Relay Replacement
Before removing the “Y” relay, make sure all leads are marked
with terminal locations. Next, disconnect all leads and remove
the two fasteners securing the “Y” relay’s shock absorbing
mounting bracket to the mechanism rear plate. Withdraw
relay and bracket. Remove fasteners securing relay to
mounting bracket.
Reverse the above procedure to install new relay.