TST-019 MRTALPCH CHANNEL
– Rev. 2016-310
Page 16 of 20
6) Vacuum line sections and included fittings may be tested by moving up each line (toward the
vacuum generating system) to the next fitting, removing the hose and plugging it at the fitting,
or by installing the ball valve assembly (with the gauge end toward
s the section that the lifter’s
gauge has been separated from) into the line.
7) Each circuit (red and green) has one vacuum pad connected by a quick connect, shown in
FIGURE 22
below. Disconnect the quick connect and repeat the vacuum test.
If, with the quick connect disconnected, the vacuum level, as shown on the lifter’s vacuum
gauge, still indicates a leak (vacuum level drops), proceed to step 10.
If, with the quick connect disconnected, the vacuum level, as shown on the lifter’s vacuum
gauge, now holds steady and does not leak, the indication is that the leak is located in the
section that was removed. This would be the pad fitting, hose, the quick connect plug
assembly, or that the quick connect leaks when connected. Proceed as follows.
8) Remove the hose from the barbed fitting of
the male quick connect plug and cap off the
barbed fitting. Connect the male plug to the
female quick connect coupler. See
FIGURE 23
.
Repeat the vacuum test.
If the leak resumes, examine the threads
of the barbed fitting for indication of
cracks. If the fitting itself does not appear
damaged, replace the quick connect.
Note, the O-ring that seals the male
portion of the quick connect to the female
half when they are attached is part of the
female coupler, due to this it is recommended that both the male and female quick connect
be replaced.
If the vacuum level,
as shown on the lifter’s vacuum gauge, continues to hold steady and
does not drop, the indication is that the quick connect does not leak when connected.
Continue to next step.
FIGURE 22
FIGURE 23
