GE Industrial Solutions PowerVac with ML-18 or ML-18H Mechanism - Manual (Page 22)

22
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
(item 10, Figure 23) on the closing spring (item 1, Figure
23).
5. Remove the closing spring.
6. Disconnect the trip linkage tension spring.
7. Loosen the interlock bracket (item 11, Figure 23).
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 (item 10, Figure 23) 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 (item 17, Figure
23) and disconnect the linkage. Remove the closing coil and
housing (item 6, Figure 23). 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, or loosen
clamping bolt in operating link. 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, or install
switch then attach leads depending upon type of switch and its
terminal accessibility. Install switch shaft in operating link with
index mark aligned as shown in the figure. 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.
1. Index Mark
2. Stopper
Figure 14 Auxiliary switch position
1
2