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3.
Check this adjustment with a O. 005-inch feeler
gage to determine that Home Switch will not
transfer.
7.12 TACHOMETER AND TACHOMETER
EXTENSION ROD
7.12.1 Tachometer Extension Rod Removal
1.
Remove outboard adjusting nut which secures
rod to carriage arm.
2.
Loosen inboard adjusting nut sufficiently to
free rod from carriage arm.
3.
Slide extension rod away from home switch
and out of the tachometer coil and housing
assembly.
WARNING: Exercise care to avoid bending the rod
or scoring the core as rod is extracted from shield.
4.
Replace tachometer extension rod by reversing
steps 1, 2, and 3.
7.12.2 Tachometer Extension Rod Adjustment
The tachometer extension rod (Figure 7-6) is ad-
justed so that when the carriage is dented in track
000, the shoulder of the rod protrudes 0.137,
Extension Rod Shoulder
flush with end of
Carriage End
of Tachometer---· ....
1
Figure 7-6. Tachometer Extension Rod Adjustment
7.10
r " .
.
(±0.010) inch from the carriage end of the tachometer.
This adjustment is performed as follows:
WARNING: Use extreme care to avoid bending the
tachometer extension rod while making this adjust-
ment.
1.
Detent carriage to track 000.
2.
Loosen the two locking nuts where rod attaches
to arm extending downward from carriage. As
a point of reference, advance the inboard nut.
This will push the extension rod further into the
tachometer. Continue this process until the
extension rod shoulder is flush with the end of
the tachometer.
NOTE: This distance can be judged within O. OlD-inch
by eye (See Figure 7-6).
3.
Back off the inboard nut by 5-1/2 turns from
the reference position obtained in step 2. Since
the nut advances O. 025-inch per revolution, the
total movement will be 0.137 inches.
4.
Hold the inboard nut firmly to prevent rotation,
and tighten the outboard nut.
In
accomplishing
this step, apply sealant
(PiN
2111360)
to
secure
the adjustment from vibration. If the assembly
is equipped with an outboard lockwasher, omit
the use of sealant to secure the adjustments.
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Troubleshooting
