TST-011
– Rev. 2013-049
Page 6 of 12
FIGURE 4
Test the hose assembly from the pump and vacuum tank to the valve assembly
for leakage:
1) Remove the ball valve from the vacuum pump and reattach the original hose to the pump.
2) Remove the hose (
4A
)
connecting the pump and tank
to the valve, from the 90°
hose nipple (
4B
), located
above the valve handle.
3) Attach the end of the ball
valve with the vacuum gauge
to this hose and, using a short
piece of hose, attach the other
end of the ball valve to the 90°
hose nipple. See
FIGURE 4.
4) With the ball valve in the open
position (handle in line with
the valve) reconnect the
battery and activate the
vacuum generating system
(pull handle of control valve
out to apply position).
5) Allow the vacuum system to reach a suitable vacuum level or to shut off automatically and, with
the valve handle still pulled out in apply position, close the ball valve (turn handle perpendicular
to valve) and disconnect the battery.
6) Observe the vacuum gauges on the ball valve and lifter to locate the area of leakage.
If the vacuum level on the
ball valve’s vacuum gauge starts and continues to drop and the
lifter’s vacuum gauge holds steady, this indicates that the leak is located in the hose or fitting
connecting the vacuum pump and tank to the valve assembly.
Replace the hose and/or fitting. Note, on lifters built before 2004 (black hose) the fitting will
be T-shaped; on lifters built after 2004 (red hose) the fitting will be Y-shaped. The design
was changed to a Y fitting for easier access but either style works.
If the vacuum level on the
ball valve’s vacuum gauge holds steady and does not drop and
the vacuum level on the li
fter’s vacuum gauge starts and continues to drop, this indicates
that the leak is located in either the gauge assembly or the control valve / filter assembly.
4A
4B
