TST-011
– Rev. 2013-049
Page 8 of 12
FIGURE 6
PAD SYSTEM TESTS
Isolate the vacuum pads, fittings and vacuum line sections until the leak point can be located, as
follows:
1)
Remove the cap from the filter’s barbed fitting and reconnect the vacuum line to the pad system.
2) Remove each pad fitting (
6A
),
disconnecting all the pads
from the vacuum system.
3) Cap all the pad fittings to seal
off the vacuum lines.
See
FIGURE 6
.
4) 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,
disconnect the battery.
If the vacuum level on the vacuum gauge holds steady and does not drop, this indicates the
leakage is in one or more pads. Reconnect one pad to its vacuum line and retest. If
indications of leakage resume, replace that pad. Continue testing until all pads have been
reconnected and all defective pads have been replaced.
If the vacuum level on the vacuum gauge starts and continues to drop, this indicates the
leakage is in the fittings or vacuum lines between the vacuum pads and the vacuum gauge
assembly.
Note, the MRT4-DC vacuum hoses are routed through the pad frame itself.
The only fittings that can be accessed externally are the pad fittings and (on lifters with coiled
red poly hose to vacuum pads) couplings that connect the coiled hoses to the (internal) straight
hoses and fittings.
6A