L4442
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7
5.0 SETTING THE TORQUE
After determining the desired torque, use the calibration
certificate supplied with your wrench to determine the
pressure that is necessary to achieve that torque.
1. Connect the tool to the power supply and turn the
pump on.
2. Adjust the pressure on the pump as necessary
to set the torque. Refer to pump manufacturer's
instruction manual.
3. When the desired pressure is reached, cycle the
tool again to confirm that the desired pressure
setting has been obtained.
Figure 7: Using the Pump
6.0 OPERATING THE WRENCH
6.1 Before Operation
• Be sure the nut or bolt to be fastened is clean and
free of loose dust or dirt.
• Be sure the nut threads properly engage with the
threads of the bolt, and that cross-threading has
not occurred.
• Be sure that the threads and the bearing surface
are liberally coated with the correct bolt lubricant
or anti-seize compound.
• Make all torque calculations based on the bolt
lubricant's (or anti-seize compound's) stated
coefficient of friction. Failure to do so may result in
the required bolt load not being achieved.
• Be sure that the backup wrench (used to keep the
nut or bolt on the opposite end in place) is correctly
positioned and secured.
Be certain that backup wrench is of the
correct size and that there is an adequate abutment
surface. Personal injury could occur if backup wrench
loosens or dislodges during bolting procedures.
WARNING
6.2 Tightening process
1. Having set your target pressure, cycle the wrench
three or four times to target pressure before putting
it on the application. Cycling the tool ensures the
system is operating properly and removes trapped
air, if any.
2. Place the correct size impact socket on the square
drive and secure properly with a ring and pin.
3. Place the tool and the socket on the nut, making
sure that the socket has fully engaged the nut.
Further ensure that the drive retainer is engaged.
4. Make sure the reaction arm is firmly abutted
against a stationary object (e.g. an adjacent nut,
flange, equipment housing etc.). When positioning
the wrench, make sure that the hose connections
are well clear of any obstructions, and that all body
parts are safely out of harms way.
Figure 8: Position tool with a suitable reaction point
5. Apply momentary pressure to the system to ensure
proper tool placement. If it doesn’t look or act right,
stop and readjust the reaction arm.
6.3 In use
1. Start the pump, the rear of the tool will be pushed
back until the reaction arm makes contact with its
reaction point.
2. Continue as the socket turns until the tool is fully
extended and will not turn the socket further; stop
the pump . Successive cycles are made until the
wrench stalls at the preset torque.
3. Operate the pump until the nut has been tightened.
4. While the pump is in operation there will be a rapid
build up of pressure to the point of where the
gauge reads what was preset prior to applying the
wrench.
The reading of full preset pressure after the
cylinder is extended does not indicate that this pressure
(torque) is applied to the bolt. It only indicates that the
cylinder is fully extended and cannot turn the socket
further until the wrench automatically resets itself.
5. Always attempt one final cycle to ensure the stall
point has been reached.
NOTICE
