Atlas Copco LTV39-2 R56-13 Produktanweisungen Seite 11

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LTV39-2 R56-13

Tightening of threaded connections

The tightening torques indicated in the exploded views list are established to achieve the correct clamping

force and preventing the parts from coming loose. At service these parts must be able to open up without

being destroyed. In special circumstances (depending on application and usage) the parts may however

come loose after some time of operation. In such cases the torque could be increased 10-20% and if nec-

essary some type of low or medium threadlocking fluid could also be applied.

Example

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.

The RE-Controller alerts the operator when it detects:

■

Missed fasteners

■

Premature tool shut-off

■

Stripped threads

■

Cross-threading

■

Rehits

■

Drop in air supply

The air pressure inside the tool is measured through a small hose (see Optional accessories - Kit RE-Sig-

nal) and converted into a digital signal. This signal is processed in the RE-Controller. The RE-Controller

gives instant visual and audio feedback to the operator on whether the tightening was OK or not OK.

For further information, please see leaflet 9833 1358 01.

Service instructions