Technical information

Compress the cups by using a steady force, don’t pound on
the QMS box. Ideally, the suction cup should be collapsed and
flattened out as much as possible, although in most installa-
tions there will almost always be a small amount of residual
air trapped inside. If you apply Vaseline to the suction cups
beforehand, and are mounting the QMS box to a window, you
can see how much the cup has collapsed by viewing it from
the inside. The outline of the air “bubble” inside will be read-
ily visible. The smaller the bubble, the better the seal and
the stronger the cup will hold.
A properly installed box will be self-supporting (without the
tie-down straps) and cannot be removed by moderate tug-
ging and pulling.
Mounting QMS Straps and Hooks. The suction cups form
one half of the QMS anchoring systems, the tie-down straps
finish the job. Included with your QMS systems are several
plastic-coated steel hooks. The tie-downs loop through these,
and the hooks hang onto ledges to form a secure anchor
point from which the strap tension is tightened.
For most compact vehicles (with a hatchback), you will want
Figure 13 —
Suction cups can
adhere to the
body of the GEO
Tracker. The
straps maintain
pressure on suc-
tion cups.
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