Ch 5 Mechanical Checks and Adjustments
A. G
enerAl
Checking the mechanical adjustments may
be performed in any order. However, the
adjustments associated with the stroke of
the mechanism must be performed in the
prescribed order since they are related in such
a way that the adjustment of one affects the
next in the series. These adjustments and the
prescribed order are:
1. Pull rod adjustment
2. Trip latch clearance
3. Overtravel stops
4. Wipe and Gap setting
For example, if the pull rod is adjusted, then
the trip latch clearance must be checked and
adjusted followed by resetting the overtravel
stops and then checking and adjusting
the wipe and gap setting. However, if only
the wipe and gap setting is adjusted, it is
not necessary to perform the adjustments
preceding it.
When adjusting the pull rod or the trip latch
clearance, the overtravel stops should be
backed out of the horizontal connecting bar
two turns to assure that they do not interfere
with the mechanism stroke during the
adjustment.
The nameplate containing the ground and
test device rating and serial information is
located on the removable front cover. Many
maintenance and repair procedures require
removal of the front cover. The serial number
is also attached to the right side ground and
test device frame between the track rollers
on an engraved metal plate. Verify that the
serial number on the removable front cover
matches the number affixed to the frame
before reassembly.
NOTICE
B. S
loW
c
loSInG
o
perAtIon
Slow closing the ground and test device allows
observation of the motion of the mechanism
while manually cranking it from the open to
the closed position. The slow closing operation
is required when performing adjustments on
the ground and test device such as setting the
pull rod adjustment and when setting the wipe
and gap.
1. Manually charge the ground and test
device closing spring using a 5/8 inch hex
socket-ratchet-type wrench for safety,
and turn in the direction of the arrow as
indicated on the end of the manual wind
shaft. Several rotations with no apparent
load are necessary until the winding
mechanism engages the spring-charging
pawl.
As the manual charging shaft is rotated the
trip latch will reset first with a small “click”.
Continued rotation will fully charge the
closing spring and a louder sound will be
heard. At this time the charge/discharge
indicator will change from “Discharged” to
“Charged”. Stop cranking when this occurs.
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15
Mechanical Checks and Adjustments
01.4IB.50100
