LTV39-2 R56-HAD
EN
Operation
© Atlas Copco Industrial Technique AB - 9839 2906 01
9
Counterclockwise rotation
Grip the gear shift ring and pull it backwards (A). Turn it clockwise until stop (C). Release the shift ring and
make sure that the shift ring returns to its most forward position.
Only the arrows indicating counterclockwise rotation should be visible (E).
Tightening Torque
For accurate operation and safety, the tightening torque of the nut runner must be set correctly in relation
to the screw joint. Check the tightening torque given to the joint in question.
The tightening torque is adjusted by altering the tension of the clutch spring. Turn the protection ring until
the hole in the clutch housing is free. Then turn the out going spindle until you can see the keyhole in the
adjustment washer. Turn the adjustment key clockwise to decrease and anticlockwise to increase the
torque. After the adjustment, turn the protective ring back again.
Verification of Tightening Torque
Recommended equipment for verification if tightening torque are an Atlas Copco Torque Analyser plus an
appropriately-sized transducer together with the available test joints.
Air Pressure Monitoring, RE-Signal S1
Reporting pneumatic assembly tools provide a pneumatic signal that indicates which part of the tightening
cycle the tool has reached, by means of variations in air pressure.
In the RE-Controller box timers are triggered when certain pressure levels are reached.
Pressure level 1 (P1) starts a timer that checks that the tightening cycle is not too short.
Pressure level 2 (P2) starts a timer that checks the time taken from when the clutch has been released to
when the operator releases the trigger to ensure that it is not too short.
The controller measures the differential pressure over the motor.
It should be noted that the system does not measure torque! Regular check of installed torque/torque out-
put of the tool must be done separately.
The RE-Controller checks the air-line pressure. One of the most common problems in air-line systems is
pressure variations. If the pressure drops too much the tool might stall and/or the torque will not be cor-
rect. The RE-Controller will give a signal if the pressure drops too much.
