TST-019 MRTALPCH CHANNEL
– Rev. 2016-310
Page 4 of 20
4) Remove the 1/4" o.d. hose (
3A
) from one of the filters (
3B
), that connects the filter to the pad
line. Using an additional piece of 1/4" o.d. hose, connect the end of the ball valve with the
vacuum gauge to the filter. Close the ball valve (turn handle perpendicular to valve body). See
FIGURE 3
, where the red circuit is shown being tested.
5) Note, since only one of the two circuits (red or blue/green) is being tested, the lifter will need to
be attached to a smooth, clean, non-porous surface for the other circuit to seal.
6) Switch the power on
( )
, and activate the vacuum generating system by pressing the apply
( )
push button.
7) Switch the power to off
( )
and observe the vacuum gauge of the ball valve to determine the
area of the leak.
If the vacuum level on the ball valve’s vacuum gauge holds steady and does not drop, the
indication is that this circuit (red or blue/green) does not leak between the check valve and
the filter.
If, during the overall test of the lifter, a leak was indicated in both circuits (red and
blue/green), remove the ball valve from the circuit being tested and repeat the process for
the other circuit.
Once it has been verified that neither circuit (red or blue/green) of the vacuum generating
system leaks, proceed to Pad System Tests.
If the vacuum level on the ball valve’s vacuum gauge starts and continues to drop, the
indication is that this circuit of the vacuum generating system does leak.
If, during the overall test of the lifter, a leak was indicated in both circuits (red and
blue/green), remove the ball valve from the circuit being tested and repeat the process for
the other circuit. This is to determine if the leak in this circuit is also in the vacuum
generating system.
Once both circuits (red and blue/green) of the vacuum generating system have been
checked and the condition of each is known, proceed to Vacuum Generating System Test.
FIGURE 3
BALL VALVE SHOWN
IN CLOSED POSITION
3A
3B
