WERKU WK400750, Original Instructions Manual

English

ENG 

ORIGINAL INSTRUCTIONS

5

6

2
3

5

4

1

7

1. RPM +

2. RPM -

3. ON/OFF button

4. Lever

5. Handle

6. Self-vacuum-system exit

7. Backing pad

USE INSTRUCTIONS.

Before starting up the sander, we recommend that 

you carefully read all of the instructions as indicated. 

Please respect all regulations regarding the 

prevention of accidents, health and safety directives, 

laws and applicable restrictions for work places. The 

sander must only be used by persons who have been 

instructed in its use and only for the purposes for 

which it has been designed.

POWER SUPPLY.

Make sure the power supply is adapted to the 

requirements shown on the information panel of the 

sander (1). Using the motor at low voltage will make 

it operate slowly. This will reduce performance and 

may cause the motor to overheat.

EXTENSION CORD.

If the working area is at some distance from the power 

supply, use an extension cord of enough diameter 

and quality.

START-UP.

When unpacking the sander, make sure it is intact, 

complete and has not been damaged in transport. 

Never use a damaged sander. Before use, check that 

the backing pad is correctly attached and tightened. 

Connect the power cord to a grounded outlet (220–

240 VAC, 50/60 Hz). In order to get the maximum 

power from this sander it is recommended to use it 

with a vacuum cleaner and a net sanding disc.

OPERATION.

The sander is intended to be operated as a hand 

held tool. The sander can be used in any position. 

Note! The sander can develop a torque reaction 

when started. Make sure the sander is switched 

off. Select a suitable abrasive and secure it to the 

backing pad. Make sure the abrasive is centred on 

the backing pad. Switch on the sander by pressing 

the ON/OFF button (2). The sander can now be 

started by pressing the lever (3). The speed can be 

adjusted between 4000 and max RPM by adjusting 

the position of the lever. The max RPM can be 

adjusted  by  pressing  RPM  +  or  RPM  -  (4).  Each 

press increases or reduces the speed by 1000 RPM, 

until it reaches the limits. The RPM can be adjusted 

in the range 4000 to 10000 RPM. When sanding, 

always place the sander on the work surface before 

starting. Always remove the sander from the work 

surface before stopping it. This will prevent gouging 

of the work surface due to excess speed of the 

abrasive. Move the sander in long sweeping strokes 

along the surface being sanded, letting the sander do 

the work (5). Pushing down on the sander slows the 

removal rate and produces an inferior quality surface 

(6). Never operate with the sander inclined, this can 

damage the base and break the sandpaper (7). Be 

sure to check your work often. This sander is capable 

of removing material rapidly, especially with coarse 

paper. To produce the best finish possible, start with 

coarse grit sandpaper and change gradually to finer 

and finer paper. A final sanding with a piece of well-

worn  fine  sandpaper  will  produce  a  professional 

looking finish that in many cases will need no hand 

sanding at all. When sanding painted surfaces, you 

may find that the sandpaper loads up and clogs with 

paint. A heat gun will work much better to remove 

paint before sanding. Avoid overloading the sander. 

Overloading will result in a considerable reduction in 

speed and efficiency and the sander will become hot. 

In this event, run sander at a no-load condition for a 

minute or two. When sanding is finished, turn off the 

sander by pressing the ON/OFF button.

PRECAUTIONS TO TAKE WHEN SANDING PAINT.

Sanding of lead based paint is not recommended due 

to the difficulty of controlling the contaminated dust. 

The greatest danger of lead poisoning is to children 

and pregnant women.