TST-020 PT-AIR
– REV. 2017-246
Page 11 of 14
DIAGNOSTICS
VENTURI AIR POWERED PUMP DIAGNOSIS:
A problem with the venturi air pump is indicated when the lifter cannot attain sufficient vacuum (>16"
Hg [54 kPa]) but does not leak when a vacuum test is performed.
Requirements
:
The power requirements of the venturi is designated by a pressure rating (in psi or kPa) and a flow
rating (in SCFM or liters/minute). This information is located on the serial number label and in the
specifications of the
lifter’s instruction manual.
Verify that compressor can provide a continuous flow at the required pressure.
Note: Compressor must be of a capacity that will provide the required air flow and pressure to the
lifter even if there are other demands on the compressor (e.g. if there are other demands for
compressed air, the compressor must be of a size that can meet those demands and still supply the
lifter’s power requirement).
Setting the pressure
:
Attach the airline to the air pressure regulator of the lifter.
Open the air supply valve. Note: The type valve may vary with lifter
model and age.
Place the control valve in the APPLY position: Pull up on the control
valve lever and move it forward, to the APPLY position (see
FIGURE
10
). Verify that the regulator pressure is set to a minimum of 80 psi
when running (80 to 90 psi typical operating pressure). If lower than
80 psi, increase the pressure to the lifter.
To set the regulator: Pull up on the yellow locking cap of
the regulator and turn clockwise to increase the
pressure reading on the gauge. (See
FIGURE 11
.)
FIGURE 10
FIGURE 11
