User Manual

APPLYING TORQUE
1. Set desired torque
2. Attach socket to ratchet head. Set directional switch
3. Apply the load at the center of the handle until you hear a
“CLICK”, IMMEDIATELY RELEASE THE LOAD. The torque
wrench will reset itself for the next operation.
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WARNING
1. Do not set torque below lowest scale
2. Do not apply more torque than max. scale
3. Do not continue applying torque when preset torque has
been reached (audible “Click”)
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CAUTION
1. Threads on bolts, nuts and other mating components should be
clean and smooth. A lubricant applied to the threads and under
heads of bolts will produce more accurate and consistent results.
2. Never torque a fastener that is already tightened. Loosen it first,
then re-torque to the desired value. The same applies to
fasteners that are overtorqued.
3. When tightening many fasteners holding one component (engine
head, pipe flanges, etc.) follow manufacturer’s recommended
procedures. If such procedures are not available, torque in a
criss-cross manner first 60-70% of the desired torque, then the
final torque.
4. DO NOT apply more torque than the rated capacity of the torque
wrench. Do not use it as a nut-breaker!!
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EXTENSIONS
When attaching an adaptor, the torque applied by the extension to
the fastener is always more than the torque setting on the wrench.
Follow the formulas below to correct torque settings.
A - Torque applied by extension to the fastener
R - Torque Set on the wrench
L - Lever length (from center of ratchet head drive to center of
socket or fastener)
E - Extension length (fromcenter Ratchet head drive to center of
socket or fastener).
EXAMPLE
If you desire 50 ft. lbs. at the end of the adaptor (A) then the torque
setting on the wrench (R) is calculated as follows:
R = 50 (16/ (16+2))
R = 50 (16/18)
R = 50 X 0.8888
Where: L = 16 inches R = 44.44 ft. lbs
E= 2 inches
Torque set on the wrench is 44.44 ft-lbs
(The formula above is applicable for in-line adapter only)
Any length of extension can be used. When the adapter is attached
perpendicular to the axis of the wrench the torque setting on the
wrench is equal to the torque on the fastener.
NOTE:
1. Regular (concentric) socket extensions which extend directly
under the drive head along the axis of the drive do not affect the
calibration of the torque wrench.
2. A handle extension (a piece of pipe extending the handles
length) MUST NOT BE USED under any circumstance. Their use
will result in erroneous torque readings and may damage the grip or
the adjusting mechanism. While applying torque, the wrench should
be held ONLY BY THE GRIP. At high torque readings, if both hands
are necessary to apply enough pressure to operate the wrench,
hold the grip in one hand. And put the other hand on the top of the
first hand, never on the wrench body.
R = A
L
L + E