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35
Maintenance
01.4IB.50023A
With the main closing spring charged,
turn the latch adjusting screw upwards
until the latch is released and the
grounding switch closes. Unscrew the
adjustment screw 2½ turns and lock
in position with the locking nut. The
latch adjusting screw is accessible from
beneath the ground and test device
through a clearance hole in the base
pan. The locking nut is accessible from
above the base pan, on the left side of
the main mechanism.
After completing the adjustment of the
close latch, reconnect the closing coil.
4) Electrical Operation
After any necessary mechanical
maintenance and lubrication is done,
operate the ground and test device
electrically several times to ensure that the
electrical control system works properly.
Refer to
.
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1) Routine Maintenance
Lubricate the blades as shown in
.
Examine the contact areas,
both moving and stationary, for evidence
of overheating, pitting, cracking or other
damage. Any damaged parts should be
replaced.
2) Moving Contact Adjustments
There are two factory adjustments of the
moving contacts which are described in this
section. No adjustment of these settings
is required for routine maintenance, but
they may need to be adjusted after major
overhaul or replacement of contact parts.
Do not adjust these settings unnecessarily.
a. Initial Kick-Off Spring Height
Adjustment
The initial height setting of the kick-off
springs is measured with the ground
making switch open. The height from
the back side of the impact snubber
and the insulating support is 21/₈”.
This height is adjusted by grasping
the impact snubber and turning the
1/₄-20 hex head bolt. Turning the bolt
clockwise will decrease the gap, and
turning the bolt counterclockwise will
increase the gap
.
b. Kick-Off Spring Pressure Adjustment
With the ground making switch in
the closed position, measure the gap
between the back of the insulating
barrier that supports the kick-off springs
and the underside of the 1/₄-20 hex
head bolts that retain the springs. This
gap should be between 1/₄” and ⁵/₁₆”
. This measurement does
not include the flat washer. To adjust
the gap, open the ground making
switch. Remove the pin connecting the
operating rod clevis to the jackshaft
arm. Loosen the locknut on the
operating arm clevis and rotate the
clevis one or more half turns to adjust
the length of the operating rod. The
clevis should be screwed into the
operating arm cross member (turned
clockwise) to decrease the gap between
the bolt head and the mounting
barrier and screwed out (turned
counterclockwise) to increase the gap.
Reconnect the clevis to the jackshaft
arm and tighten the locking nut. Close
the ground making switch and recheck
the gap. Repeat as necessary to achieve
optimum adjustment of the gap.
