Needed
Items:
- S/R preset
torque wrench from the LTC, LTCR, or LTCS Series.
If LTC wrench, an SD or SDRT interchangeable head must
be used.
- S/R Combination
Adjusting and Release Tool (CART Tool).
- Torque Tester
of +/- 1% I.V. Accuracy or better.
Torq-Tronics® (Used in this demonstration.) or System 4/5
|
|
|
Start
torque tester.
Allow tester to warm up.
Check tester for zero.
Set tester to use selected unit of measure.
Set tester to capture initial peak torque.
|
|
|
The
CART Tool has two hex keys, one inside the other. The inner
hex key is “T” shaped, enclosed in a vinyl cushion,
and is pointed. This is the Torque Adjustment Key. It is
used to adjust the torque setting. Rotating it clockwise
when it is engaged with the adjustment nut increases the
torque setting; rotating it counter-clockwise when it is
engaged with the torque adjustment nut decreases the torque
setting.
The
outer key is the Locking Key. It is “L” shaped
and has a larger hex size. This key engages a jam nut inside
the wrench to lock the torque setting in place. To adjust
the torque, the nuts must first be disengaged from contact
with each other.
|
 |
Align
the CART Tool with the rear of the torque wrench as shown
here. |
 |
Insert
the Torque Adjustment Key into the wrench as shown. The
Locking Key should not yet be engaged. The Torque Adjustment
Key will slide easily into the center of the wrench adjustment
mechanism. Some slight rotation of the key may be necessary
to assure it fully engages the torque adjustment mechanism.
.
|
 |
Insert
the Locking Key into the jam nut by sliding it forward on
the CART Tool. Only finger pressure will be needed to tell
when the Locking Key meets the jam nut. It may be necessary
to slightly rotate the Locking Key to allow the hex on the
key to engage the hex on the nut. When the engagement occurs,
you will feel the Locking Key slide further forward
slightly. |
|
Hold
the Locking Key in position and rotate the Torque Adjustment
Key slightly clockwise to insure the jam nut is disengaged
from the torque adjustment mechanism.
|
 |
Engage
the square drive of the torque wrench to the tester. The drive
must be fully engaged for proper testing. |
 |
Cycle
(“click”) the torque wrench 4 times to determine
the current torque setting. Read and note the last reading
displayed by the tester.
This is the start point for torque adjustment.
For this demonstration, our target torque is 20 foot pounds.
Since the wrench is currently set at 7.6 foot pounds, the
torque setting will need to be adjusted upwards. |
|
With
the wrench still engaged to the tester, grasp the wrench
grip and rotate the CART Tool clockwise to increase the
torque setting. If there is a large difference between the
current torque level and the desired setting, repeat the
rotation several times. The further the clockwise rotation,
the higher the torque is adjusted. Care should be taken
not to exceed the maximum torque; small amounts of rotation
between tests on the tester are recommended.
|
 |
Retest
the torque wrench on the tester to determine the current torque
setting. This is necessary each time the Torque Adjustment
Key is rotated.
Note the reading of 11 foot pounds in the photograph. It is
better to make several small adjustments to the torque setting
instead of trying to make one large one. |
 |
Repeat
Steps 7 and 8 until the target torque is reached, as displayed
by the tester.
TIP! If the adjustment is made to just a few percentage points
above the target torque, any settling of the adjustment mechanism
in the next step will bring the torque into almost the exact
torque desired. |
|
Grasp
the wrench and the CART Tool. Hold the Adjustment Key in
place and rotate the Locking Key clockwise until it jams
against the torque adjustment mechanism. This will be felt
as firm resistance to further rotation. Then hold the Locking
Key in place and attempt to rotate the Adjustment Key counter-clockwise.
It should not move more than a small fraction of a turn.
When that is the case, the torque is set and locked in place.
|
|
|
Test
the wrench again on the torque tester to verify that the torque
setting was not accidentally changed during the locking procedure.
Remove the CART Tool from the torque wrench.
The torque is now set and the wrench ready for use! |
