Atlas Copco LTD28 R-RR Produktanleitung Seite 6

Safety and operating instructions
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
Atlas Copco Torque Analyser, ACTA 3000, plus an appropriately-sized in-line
transducer, IRTT together with the available test joints are recommended equip-
ment.
Reaction bar
Adapt and use the torque reaction bar (see figure in Service instructions) as fol-
lows:
1 Shaping the reaction bar
The torque reaction bar must be shaped to fit a suitable fixed support. To avoid
overloading of the bearings for the tool drive and of the reaction bar, the
point of contact on the reaction bar should be within the shaded area (F),
see Fig. A.
• Draw a line (B – E) at right angles (90
chine from point (B). Starting at point (B), draw two lines at angles of +15
o
and -15 respectively from the marked 90
• Mark the area (F) between the drawn lines.
• Adapt the shape of the reaction bar so that the point of contact (K) falls
within the marked area (F). The minimum breaking force is obtained if
the point of contact (K) is on or close to line (B – E).
• If the point of contact falls within angle (α) – in area (G) – there is a risk of
overloading of the bearings for the machine drive and deformation of the re-
action bar.
• If the point of contact is outside angles ± 15
of rapid wear of the hexagon sleeve and reduced torque accuracy.
2 Bending
• Aluminum torque reaction bar: The inner radius must not be smaller then 25
mm after bending.
• Steel torque reaction bar: Heat the spot to red colour. After bending, allow
to cool slightly in room temperature and then chill.
• It is appropriate to fit the reaction bar with a protective sleeve of rubber or
similar material to dampen blows.
3 Assembly
• Place the reaction bar in the wanted position on the machine.
• Tighten the lockring to the recommended torque.
• Check regularly that the lockring is firmly secured.
4 Use
• Before starting the machine, apply the reaction bar opposite the direction of
the drive of the machine. See Fig. B.
6
EN
o
) to the centre line (A – C) of the ma-
o
-line.
o
– in areas (H) – there is a risk
© Atlas Copco Industrial Technique AB - 9836 941107 07
LTD28 R-RR
o