26
A DVAC® 3 8 K V I N STA LL ATI ON , OPE R ATI ON A N D M A I NTE N A NCE M A N UA L
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Maintenance
Integrated racking mechanism
The integrated racking mechanism, or “truck,”
requires visual inspection of hardware, lubrication
and operation during routine maintenance.
With the breaker outside the cell, verify all visible
hardware tightness, including handles
9
and
wheels
7
. Wheels should rotate freely by hand
movement. Replace or tighten any missing or
loose hardware.
With the breaker outside the cell, rotate the racking
screw as though racking the breaker to the connect
position. This process will expose surfaces inside
the truck that need to be inspected and lubricated.
Lubricate the exposed parts; specifically the entire
racking screw
2
and position release shaft
3
assemblies during the operation. Inspect breaker
locking tabs
8
and secondary locking tab
1
for
any damage. Return truck to disconnect position.
As a precaution, do not operate the breaker outside
the cell unless the truck is in the full disconnect
position.
The racking pin monitor
5
is a truck-operated
contact (TOC) that gives absolute operation
position status for test and connect position
indication. The TOC contacts located in the breaker
compartment change state just prior to the breaker
reaching the connected position. Lubricate location
2
and
14
with iso flex Topaz NB 52 or SAE
80W/90 type oil, using an oiler or spray can, every
100 or more racking operations.
1
Secondary locking tab
2
Racking screw
3
Position release shaft
4
Grounding connection
5
Racking pin monitor / close blocking switch
6
Position release lever
7
Wheels
8
Cell locking tabs
9
Insertion/removal handles
10
Racking screw collar
11
Racking lock for tag out
12
Spring charged interlock
13
Racking pin
14
Lubrication holes
—
01 Truck shown with
breaker removed.
—
01
7
4
2
5
7
8
9
7
8
3
12
13
7
8
9
6
14
11
10
