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Maintenance and service – Bosch GRL 300 HV Professional User Manual

Page 27

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English | 27

Bosch Power Tools

1 619 929 J21 | (21.6.11)

Parallel Alignment of a Plumb Beam/Projecting Right

Angles (see figure D)
When right angles are to be projected or when partitions are

to be aligned, the plumb beam 9 must be aligned parallel,

meaning at the same distance to a reference line (e.g. a wall).
For this, set up the measuring tool in the vertical position and

position it in such a manner that the plumb beam runs approx-

imately parallel to the reference line.
For exact positioning, measure the clearance between plumb

beam and reference line directly on the measuring tool with

help of the laser target plate 43. Measure the clearance be-

tween plumb beam and reference line again as far away as

possible from the measuring tool. Align the plumb beam in

such a manner that it has the same clearance to the reference

line as when measured directly at the measuring tool.
The right angle to the plumb beam 9 is indicated by the varia-

ble laser beam 6.
Indicating a Plumb Line/Vertical Plane (see figure E)
To indicate a plumb line or a vertical plane, set up the measur-

ing tool in the vertical position. When the vertical plane is sup-

posed to run at a right angle to a reference line (e.g. a wall),

then align the plumb beam 9 with this reference line.
The plumb line is indicated by the variable laser beam 6.
Turning the Rotational Plane when in the Vertical Position

(see figure F)
To align the vertical laser line or the rotational plane against a

reference point on a wall, set up the measuring tool in the ver-

tical position, and roughly align the laser line or the rotational

plane with the reference point. For precise alignment with the

reference point, press button 28 (clockwise rotation) or but-

ton 29 on the remote control (anticlockwise rotation).
Working without Laser Receiver (see figure G)
Under favourable light conditions (dark environment) and for

short distances, it is possible to work without the laser receiv-

er. For better visibility of the laser beam, either select line

operation, or select point operation and manually rotate the

rotation head 10 to the target location.
Working with the Laser Receiver (see figure H)
Under unfavourable light conditions (bright environment, di-

rect sunlight) and for larger distances, use the laser receiver

for improved finding of the laser beam. When working with

the laser receiver, select rotational operation with the highest

rotational speed.
Measuring Over Long Distances (see figure I)
When measuring over long distances, the laser receiver must

be used to find the laser beam. In order to reduce interferenc-

es, the measuring tool should always be set up in the centre of

the work surface and on a tripod.
Working Outdoors (see figure J)
The laser receiver should always be used when working out-

doors.
When working on unstable ground, mount the measuring tool

onto the tripod 37. Activate the shock-warning function in or-

der to avoid faulty measurements in case of ground vibrations

or shock to the measuring tool.

Overview of Indications

Maintenance and Service

Maintenance and Cleaning

Keep the rotational laser level, battery charger and remote

control clean at all times.
Do not immerse the rotational laser level, battery charger and

remote control into water or other fluids.

Wipe off debris using a moist and soft cloth. Do not use any

cleaning agents or solvents.
Particularly clean the surfaces at the outlet opening of the ro-

tational laser level regularly and pay attention for any lint.
If the rotational laser level, battery charger or remote control

should fail despite the care taken in manufacture and testing,

repair should be carried out by an authorised customer servic-

Laser beam

Rotation of the laser*

green

red

green

red

Switching on the measuring tool (1 s self-check)

z

z

z

Levelling in or re-levelling

2x/s



2x/s

Measuring tool levelled in/ready for operation

z

z

z

Self-levelling range exceeded

2x/s



z

Shock-warning function activated

z

Shock warning actuated

2x/s



2x/s

Battery voltage for ≤2 h operation

2x/s

Battery empty





z

* for line and rotational operation
2x/s
z


Flashing frequency (twice per second)
Continuous operation
Function stopped

OBJ_BUCH-757-007.book Page 27 Tuesday, June 21, 2011 10:16 AM