Dust/Chip Extraction; Starting Operation - Bosch PEX 300 AE Manual Original

OBJ_BUCH-1334-003.book Page 14 Tuesday, July 12, 2011 10:35 AM
14 | English
Replacing the Sanding Sheet (see figures A–B)
To remove the sanding sheet 6, lift it from the side and pull it
off of the sanding plate 4.
When attaching a new sanding sheet, remove any dust or de-
bris from the sanding plate 4, e. g., with a brush.
The surface of the sanding plate 4 is fitted with Velcro backing
for quick and easy fastening of sanding sheets with Velcro ad-
hesion.
Press the sanding sheet 6 firmly against the bottom side of
the sanding plate 4.
To ensure optimum dust extraction, pay attention that the
punched holes in the sanding sheet match with the holes in
the sanding plate.
The alignment aid 7 can be used for alignment of the sanding
sheet 6 on the sanding plate 4. Place the sanding sheet with
the Velcro facing upward on the alignment aid. Press the cams
of the alignment aid into two holes of the sanding plate and
roll off the sanding sheet from the alignment aid. Press the
sanding sheet firmly against the sanding plate.
Selection of the Sanding Plate
Depending on the application, the machine can be equipped
with sanding plates of different hardness:
– Sanding plate, medium (black): Suitable for all sanding
work; universally usable.
– Sanding plate, soft (grey, accessory): Suitable for interme-
diate and fine sanding, incl. on convex surfaces.
Replacing the Sanding Plate (see figures C–D)
Note: Replace a damaged sanding plate 4 immediately.
Pull off the sanding sheet or the polishing accessory. Unscrew
the four screws 8 completely and remove the sanding plate 4.
Clean the upper side of the new sanding plate 4. Apply a thin
coat of synthetic grease to the outer ring hatched grey in the
figure.
Attach the new sanding plate 4 and tighten the four screws
again.
Note: A damaged sanding-plate base 9 may be changed only
by an authorised after-sales service agent for Bosch power
tools.

Dust/Chip Extraction

Dusts from materials such as lead-containing coatings,
some wood types, minerals and metal can be harmful to
one's health. Touching or breathing-in the dusts can cause
allergic reactions and/or lead to respiratory infections of
the user or bystanders.
Certain dusts, such as oak or beech dust, are considered
as carcinogenic, especially in connection with wood-treat-
ment additives (chromate, wood preservative). Materials
containing asbestos may only be worked by specialists.
– As far as possible, use a dust extraction system suitable
for the material.
– Provide for good ventilation of the working place.
– It is recommended to wear a P2 filter-class respirator.
Observe the relevant regulations in your country for the
materials to be worked.
2 609 004 767 | (12.7.11)
Prevent dust accumulation at the workplace. Dusts can
easily ignite.
Integrated Dust Extraction with Dust Box
(see figures E–H)
Attach the dust box 3 onto the extraction outlet 10 until it
latches.
The filling level of the dust box 3 can easily be checked
through the transparent container.
To empty the dust box 3, pull it off toward the bottom with a
twisting motion.
Before opening the dust box 3, it is recommended to loosen
the dust from the filter element by gently striking it against a
firm support (as shown in the figure).
Hold the dust box 3 firmly, fold the filter element 11 upward
and empty the dust box. Clean the thin plates of the filter ele-
ment 11 with a soft brush.
Note: To ensure optimum dust extraction, empty the dust box
3 in good time and clean the filter element 11 at regular inter-
vals.
When working vertical surfaces, hold the power tool in such a
manner that the dust box 3 faces downward.
External Dust Extraction (see figure I)
Mount a vacuum hose 12 onto the extraction outlet 10. Con-
nect the vacuum hose 12 with a vacuum cleaner. An overview
for the connection of various vacuum cleaners can be found at
the end of these instructions.
The vacuum cleaner must be suitable for the material being
worked.
When vacuuming dry dust that is especially detrimental to
health or carcinogenic, use a special vacuum cleaner.
When working vertical surfaces, hold the power tool in such a
manner that the vacuum hose faces downward.
Operation

Starting Operation

Observe correct mains voltage! The voltage of the pow-
er source must agree with the voltage specified on the
nameplate of the machine. Power tools marked with
230 V can also be operated with 220 V.
Switching On and Off
To start the machine, push the On/Off switch 2 forward so
that the "1" is indicated on the switch.
To switch off the machine, push the On/Off switch 2 toward
the rear so that the "0" is indicated on the switch.
Preselecting the Orbital Stroke Rate
With the thumbwheel for preselection of the orbital stroke
rate 1, you can preselect the required orbital stroke rate, even
during operation.
1–2 Low stroke rate
3–4 Medium stroke rate
5–6 High stroke rate
Bosch Power Tools