Recovery System 51Service Manual – Focus II / Scrubtec R6 Rider Autoscrubber
Vacuum Suction Test
Use this procedure to verify that the vacuum system is performing within factory specications. This
procedure can also be used to isolate the cause of a vacuum problem between a clog or leak. It is a two-part
procedure that veries both static pressure and ow rate. This procedure requires a vacuum gauge (PN
56205281), a piece of 1½" PVC (or similar) tube, a 1" hole saw, and some duct tape (or similar, for a seal).
1. Remove the suction hose (3) from the squeegee
and then turn on the vacuum.
2. Place the vacuum gauge (7) on the hose so the
taper (7A) seals against the end of the hose (3A).
3. Record the vacuum pressure reading from the
gauge. This is the static pressure.
4. Turn the vacuum off while constructing and
tting the PVC restricter tube (8).
5. Cut a piece of 1½" PVC approximately 6" long,
and clean off the burs. The outer diameter of the
tube should be close to, but not larger than 2".
6. Drill a 1" hole (8A) approximately in the middle of
the PVC tube, and clean off the burs.
7. As necessary, wrap duct tape (8B) around the
tube so it ts snugly in the end of the end of the
suction hose (3A) with no leaks.
8. Turn the vacuum on and place the vacuum gauge
on the restricter tube.
9. Record the vacuum pressure reading from the
gauge. This is the restricted ow pressure.
Results Summary
The rst part of this procedure determined the static pressure of the vacuum system, and the second part
determined the ow rate (by calculation). The ow rate through a restriction (8A) is determined by the
pressure differential across the restriction. These two parameters may be used to determine if the vacuum
system is functioning properly, and may also be used to isolate a possible cause for a problem.
• If the static pressure is at least 55 psi, then the vacuum motor(s) are functioning properly and there are
no signicant leaks in the system.
• If the restricted ow pressure is at least 10 psi for a single vacuum, or 20 psi for a dual vacuum, then
there are no signicant clogs in the system.
• If both parameters are below specications, then one or both vacuum motors may be failing, or there may
be a signicant leak in the system.
7
7A
3A
3
8
8A
8B
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