Page 12
Appendix A
COUNTERBALANCE
For voltage or current ratings in which blades are
counterbalanced,
Fig.
13
shows
proper
connections and the proper location of the drain
holes for the various switch mountings. The
counterbalances are assembled at the factory for
the mounting positions as required for each
installation. If it is necessary to change the
mounting position of the switch in the field, the
counterbalance must be changed, as described
below.
UPRIGHT TO VERTICAL
WARNING
When performing this procedure, use care
because parts are in tension.
1.
Open the switch blade to approximately the 75
degree position.
2.
Clamp the plunger of the counterbalance with
vise grip pliers against the face of the housing.
3.
While maintaining a good hold on the blade
with your hand, carefully open the blade a few
more degrees or enough to relieve pressure.
Remove pin A (Fig. 13) which attaches the
plunger to the blade hinge casting. Since this
pin is larger in diameter at the center and two
shoulders hold it in place, the pin may be a bit
difficult to remove.
4.
Lower the blade to approximately a 15 degree
angle.
5.
At
or
near
this
point,
connect
the
counterbalance plunger to the proper point for
vertical mounting by re-installing pin A.
6.
Raise the blade to relieve pressure.
7.
Remove the vise grip pliers.
8.
File off any burrs on the counterbalance shaft.
9.
Proceed to step 5 of installation and adjustment
on page 3.
CHANGE TO INVERTED
WARNING
When performing this procedure, use care
because parts are in tension.
Additional parts are required, contact the factory
before proceeding
.
1.
Start with the switch blade in the CLOSED
position.
2.
Clamp the counterbalance plunger with the vise
grip pliers against the face of the housing.
3.
Raise the blade slightly to relieve pressure.
4.
Remove pin A (Fig. 13) which attaches the
plunger to the blade hinge casting. Since this
pin is larger in diameter at the center and two
shoulders hold it in place, the pin may be a bit
difficult to remove.
5.
Remove pin B (Fig. 13) at the rear of the
counterbalance. The unit is now freed to be
inverted.
6.
Re-connect the rear of the counterbalance with
Pin B.
7.
Remove the jaw assembly from its support
insulator.
8.
Lower the blade below the CLOSED position
and connect the counterbalance plunger to the
proper point for inverted mounting.
9.
Raise the blade to relieve pressure.
10.
Remove the vise grip pliers.
11.
File off any burrs on the counterbalance shaft
created from the vise grip pliers.
12.
Re-install the jaw assembly; hand tighten the
bolts.
13.
Proceed to step 5 of installation and adjustment
on page 3.
Fig. 13 Positions of Blade
Counterbalance Mechanism
