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When unpacking, make sure that all of the
standard equipment is present and that there
is no transportation damage.
Before preforming any work on the
machine itself, disconnect the power plug.
ATTACHING THE REAR WHEELS
1. Place one axle cap-and-pin assembly onto
end of axle.
2. Hammer pin into cap until the top of the pin
is flush with the top of the cap.
3. Slide one wheel onto the axle, slide axle
through the canister, then slide second
wheel onto axle as shown in figure 3.
4.
Turn canister on its side.
5.
Place second axle cap-and-pin assembly
onto end open of axle.
6. Hammer pin into cap until the top of the pin
is flush with the top of the cap.
ASSEMBLING THE MAIN HANDLE
The vacuum cleaner can be moved easily with
the main handle. Always move the unit using
both hands. Insert the handle into the two
openings and fasten with the two handle clamps.
ATTACHING THE VACUUM HOSE
Connect the 35-mm vacuum hose (standard
equipment) onto the 3931A’s hose port by
sliding the wider end of the hose onto the port
then turning it to the right slightly to lock it in place.
The 35-mm hose can be connected to
optional accessories, including the Bosch
VAC011 wand kit and the dust extraction
hoods on various power tools and
accessories, including those on Bosch router,
planer, grinder, sander, jigsaw, and
hammer/drill tools and accessories .
The 3931A’s hose port also accept many other
vacuum hoses, including most 1-1/4” hoses, 1-
1/2” hoses, 2-1/2” hoses and other Bosch
hoses. (See Accessories, page 12 & 13)
INSTALLING THE DUST BAG
When dry-vacuuming such materials as dust
from drywall, plaster, cement, soot, and flour,
a dust bag should be inserted.
Even when vacuuming other dry materials,
using a dust bag extends the amount of time
the unit operates at high performance and
extends the amount of time it takes for the
filter cartridge to become clogged. Using a
dust bag also makes waste disposal much
easier, eliminating the cloud of dust that is
created when the canister contents are
poured out, helping to protect you and the
environment from exposure to the unwanted
particles an debris.
Notes:
• VAC013 bags should not be used when
wet vacuuming.
• VAC022 heavy-duty wet/dry bags can be
used when vacuuming wet materials. It is
ideally suited for slurry-suction applications.
• The filter cartridges must be installed, even
when using a bag.
To install the bag:
1. Unlock the canister latches and remove the
control unit.
Assembly & Preparation
CANISTER LATCH
CANISTER
HANDLE OPENING
HOSE PORT
VACUUM
HOSE
DUST BAG
FIG. 2
AXLE CAP
WHEEL
AXLE
CANISTER
PIN
FIG. 3
BM 1609929K45 08-06 8/14/06 11:42 AM Page 6