TST-019 MRTALPCH CHANNEL
– Rev. 2016-310
Page 8 of 20
12) Begin by separating the tank line from the
pump/control box assembly. Disconnect the
hose (
7A
) from the 45° barbed fitting,
connected to the pump solenoid. Attach the
end of the ball valve assembly with the
vacuum gauge to this hose. Using an
additional piece of hose, attach the other end
of the ball valve to the 45° barbed fitting.
See
FIGURE 7
.
13) With the ball valve in the open position,
(handle in line with the valve), switch the
power on
( )
, and activate the vacuum
generating system by pressing the apply
( )
push button.
14) Close the ball valve (turn handle perpendicular to the valve) but leave the power turned on
( )
.
Note, it is possible for both the following conditions to exist. If so, then perform the tests in the
order listed.
If the vacuum pump cycles during the test, the indication is that the pump solenoid, the
vacuum switch or the hose connections between these parts, is the cause of the leak.
Switch the power off
( )
and proceed to next step.
If the vacuum level, as shown on the ball valve’s vacuum gauge, starts and continues to
drop, the indication is that the hose connection to the vacuum tanks is the cause of the leak.
Proceed to step 30.
15) Remove the ball valve from the tank
line and solenoid valve. Using a short
piece of hose (
8A
), connect the end of
the ball valve with the vacuum gauge
directly to the pump solenoid. With the
gauge end of the ball valve connected
to the 45° barbed fitting of the solenoid
valve, close the ball valve (turn handle
perpendicular to the valve), as shown in
FIGURE 8
.
16) With the ball valve in the closed
position (handle perpendicular to the
valve), switch the power on
( )
and
activate the vacuum generating system by pressing the apply
( )
push button.
17) Switch the power to off
(
)
. If the vacuum level of the
ball valve’s vacuum gauge starts and
continues to drop, a leak does exist in this section of the pump/vacuum switch assembly.
18) Note: Lifters with serial number 20161736 or greater, have been fitted with the digital vacuum
switch. Proceed to next step for these lifters.
Lifters with serial numbers before 20161736, will have an analog vacuum switch mounted
inside the control enclosure. Proceed to step 20 for these lifters.
FIGURE 8
8A
FIGURE 7
7A
