Bedienungsanleitung Ferm fbh 850 kn (Seite 6 von 52) (Deutsch, Englisch, Holländisch, Französisch, Italienisch)

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To remove the bit, slide and hold the locking •

sleeve to the rear.

Setting depth gauge

Loosen the handgrip by turning it •

anticlockwise.

Insert the depth gauge ruler through the hole •

in the auxiliary handgrip.

Slide the ruler to the desired depth.•

Retighten the screw firmly.•

Function selection switch

Fig. C

The correct position of the selection switch for

each machine function is given in the diagram

(Fig.C) on page 2.

1 = Demolition hammer/chisel

2 = Rotary hammer drill

3 = Drilling

Switching On/Off

To start the drill, squeeze the trigger.•

To stop the drill, release the trigger.•

Installing dust catcher

Fig. D

The dust catcher prevents large amounts of

drilling dust entering the machine when drilling into

ceilings.

Remove the drill bit.•

Slide the dust catcher over the shaft of the drill •

bit.

Place the drill bit with catcher in the drill chuck.•

Always replace a damaged dust catcher •

immediately.

4. MAINTENANCE

Take care that the machine is not

connected to power whenever

maintenance work on the mechanical

parts is taking place.

The machines are designed to function

problem-free for a long period with a minimum

of maintenance. Through regular cleaning and

correct treatment, you help assure a long working

life for your machine.

Defects

The machine should be regularly inspected for

the following possible defects, and repaired if

necessary.

Damage to power cord•

Broken on/off trigger assembly.•

Short circuiting.•

Damaged moving parts.•

Trouble shooting

1. When switched on, the motor does not

turn.

Failure in power supply.•

Check the power supply.•

Poor contact in the on/off trigger.•

Repair or replace the trigger assembly.•

Mains voltage too low.•

Extension lead too long, or too light.•

Damaged motor.•

Have your machine repaired by an expert.•

Carbon brushes worn.•

Replace the carbon brushes•

2. Motor generates excessive noise, and runs

too slowly or not at all.

Motor is overloaded due to excessive •

pressure or drilling depth.

Reduce the pressure or drilling depth, •

reduce power.

Damaged motor.•

Have your machine repaired by an expert.•

Supply voltage too low.•

Adjust the supply voltage.•

Carbon brushes worn.•

Replace the carbon brushes•

3. Overheating in the transmission case.

Overloading of machine, or blunt drill bit•

Reduce the loading, or hone the drill bit.•

Reduced voltage.•

Adjust the supply voltage.•

4. Heavy sparking from the motor.

Inspect the carbon brushes for wear.•

Replacing carbon brushes

Replace both carbon brushes at the same •

time.

Regularly check the carbon brushes for wear •

and defects.

Always replace worn-out carbon brushes.•

Always keep the carbon brushes clean, and •

make sure that neither brush is obstructed.

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