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Operating Instruction Manual:
OM-TPA-A-01
Serial Numbers:
All
15
5.10 Bleeding Trapped Air from the System & System Leak Test
Torque wrenches and hoses are not always completely filled with oil when new. For safe and efficient
operation, trapped air must be removed from the system. The following procedure must be carried out with
a torque wrench connected to the pump, but
NOT
fitted on a bolt.
For best performance, perform the below process each time hoses or tools are changed / swapped.
To remove air from the system, proceed as detailed below:
Position the tool below the level of the hydraulic pump (as illustrated).
Connect the pump to an air supply and turn on the air supply. (The motor
will not start until a pendant button is pressed).
Adjust the air regulator control (19) to between 5.5 and 7 bar, as shown on
the air pressure gauge (16).
NOTE:
The tool may slowly perform a retracting motion. This is normal but
does not always occur, it will depend on a number of factors.
Ensure the pressure relief valve (13) is fully open (wound anti-clockwise).
Press the ‘Advance’ button on the control pendant (14) once, to turn on the pump. (See
figure 5.6
)
Press and hold the ‘Advance’ button (see
figure 5.6
) on the control pendant (14). The tool may stay
stationary or advance slowly depending on the relief valve setting.
Set the adjustable relief valve (13) to approx. 100 bar. The tool will advance to its full stroke. If the
tool retracts, then the hoses are connected incorrectly and need to be swapped over at the tool
couplers.
Release the
‘Advance’ button on the control pendant. The tool will automatically retract and the
gauge pressure will build up to between 80 & 90 bar.
Repeat the advance and retract cycle at least 10 times to fully purge the air from the system.
Visually inspect the system for leaks.
(Low-Pressure leak test)
With the air motor running the retract hose/s still contains 80 - 90 bar pressure.
DO NOT TOUCH.
NOTE:
When longer hoses are used (greater than 5m), the above procedure may not remove all
the air from the system. In these cases, contact your Hi-Force representative for advice on pre-filling
hoses with hydraulic oil.
Press and hold the
‘Advance’ button again. While doing so, adjust the relief valve by turning the
knob clockwise until the maximum working pressure (700 bar) is reached. The pressure can be
reduced by turning the knob anti-clockwise. The pressure setting can be locked at the desired value
by tightening the wing nut under the adjusting knob clockwise.
Cycle the pump 2-3 times to full pressure making sure both the pump and connected tool/s operate
smoothly through the entire pressure range.