Operating Instructions
the pressure regulator valve and
turning the thumb screw.
NOTE: Turn the thumb screw clockwise to increase pressure and counterclockwise to decrease pressure.
When decreasing pressure, it is necessary to turn the thumb screw to a pressure setting below what is
desired and gradually increase pressure to the desired level.
7. Once the desired pressure is stabilized, release the remote control button and tighten the locking ring.
8. Prior to tightening a nut, press the remote control button and confirm the correct pressure has been set.
Manual Pumps
Find the required torque in the Pressure/Torque conversion chart and read
across the chart to the corresponding pressure.
Operating the Wrench
Electric or Air Pump
Tightening
1. Connect the torque wrench to the pump unit. Ensure that the couplings are fully screwed together as they are
self-sealing and will restrict oil flow if not fully connected.
NOTE : TWSD torque wrenches are equipped with a pressure release valve built into the Multi-Axis Swivel
Manifold to protect against retract pressure intensification should the retract port hydraulic coupling not be fully con-
nected, or become loose during use. If an intensification occurs, the valve will bleed hydraulic oil externally from the
manifold yoke. Note that oil bleeding from the swivel manifold is not a sign of seal leakage.
2. Prior to applying the torque wrench (and socket) to the application, the pump output pressure must be pre-set to
relieve at the pressure obtained from the ‘Pressure – Torque Conversion Chart’. This can be done with the
torque wrench connected to the pump and resting on the floor or bench. Applying advance pressure to the
torque wrench will extend the piston until it reaches the end of its stroke whereby the pump pressure will build.
Holding the wrench at the end of its stroke will allow the pump pressure to be adjusted. Retract the torque
wrench piston and advance again making sure that the pump relieves at the desired pressure setting.
Blanking the pump outlets using blank couplings can also be done to carry out the pump pressure setting.
NOTE : Allow time for the wrench to retract. If another advance stroke is made before the torque wrench has fully
retracted, the ratchet mechanism may not engage correctly, causing it to jump a ratchet tooth (probably damaging
the ratchet). Before applying another advance stroke, make sure that the pump is idling at 69 Bar (1000psi), which
indicates full retraction.
3. Apply the torque wrench and socket to the nut to be tightened, ensuring that the reaction arm butts firmly and
squarely against the selected reaction point.
4. Start the pump and advance the torque wrench. As the wrench strokes forward the reaction arm will press
against the reaction point and the nut / socket will rotate. When the torque wrench reaches the end of its stroke,
the pump pressure will build rapidly. Retract the torque wrench (the wrench ratchet mechanism will be heard
clicking as it retracts), and apply another forward stroke
5. Several forward strokes are made until the nut ceases to rotate during the stroke, (known as stalling), but bear
in mind that nut rotation will always cease at the end of the wrench stroke and must not be confused with the
wrench stalling. WHEN THE WRENCH STALLS, APPLY ANOTHER FORWARD STROKE AND OBSERVE THE
PUMP PRESSURE GAUGE, WHICH SHOULD READ THE DESIRED PRE-SET PRESSURE.
6. Retract the torque wrench, stop the pump unit, and remove from the nut
Sheet No.
7 of 12
Rev
Date: 16 July 2007
