Fein GRIT GI 75 User manual

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Jede Verfügungsbefugnis wie Kopieren und Weitergabe liegt bei FEIN. Sahre / MVK 04 / 2009
Hedensted / Grit
GI 75 / GI 75 2H

GRIT by FEIN
Alle Rechte bei FEIN, insbesondere für den Fall der Schutzrechtanmeldung.
Jede Verfügungsbefugnis wie Kopieren und Weitergabe liegt bei FEIN. Sahre / MVK 04 / 2009
Hedensted / Grit
GI 75 / GI 75 2H
Specifications
Type GI 75 GI 75 2H
Reference number 7 902 01 00 403 7 902 02 00 403
No - load speed (U/min) 3000 1500 / 3000
Power input (kW) 4,0 2,6 / 3,1
Voltage (Volt) 3 x 400 3 x 400
Frequency (Hz) 50 50
Grinding - belt speed (m/s) 30 15 / 30
Weight (kg) 65 65
Class of protection I I
Belt dimension (width/lenght in mm) 75 x 2000 75 x 2000

GRIT by FEIN
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Jede Verfügungsbefugnis wie Kopieren und Weitergabe liegt bei FEIN. Sahre / MVK 04 / 2009
Hedensted / Grit
Before you start rerpairing and at least after having finished repair ( especially motor or switch ) it´s important
to test the turning direction of the motor without grinding belt mounted. If the turning direction is wrong
(and working with grinding belt mounted) it can cause accidents and damages of the belt grinder .
Furthermore you can´t adjust a belt grinder correctly if the running direction is wrong!
Correct
turning direction
Safety precautions

GRIT by FEIN
Alle Rechte bei FEIN, insbesondere für den Fall der Schutzrechtanmeldung.
Jede Verfügungsbefugnis wie Kopieren und Weitergabe liegt bei FEIN. Sahre / MVK 04 / 2009
Hedensted / Grit
Test instructions referring to VDE 701 / part 1
Grit –belt grinders are basicly placed in protection class 1.
After repairing or changing of motor, switch or cable etc. each belt grinder must be
electrical tested referring to VDE 701/part 1 as shown in the list below.
1.
protective earth
conductor test
Measuring points: machine housing against PE on the plug
Testing time: 3 sec
PE resistance: max. 0.3 Ohm with 5 m long mains power cable
2.
Insulation
resistance
measurement
Measuring points: machine housing against L1, L2, L3
(switch box must be open up, see picture)
Testing time: 3 sec
Testing voltage: 500 V DC
Insulation resistance: min 1.0 M Ω
3.
High voltage test
Measuring points: machine housing against L1, L2, L3
(switch box must be open up, see picture)
Testing time: 3 sec
Testing voltage: 1000 V AC

GRIT by FEIN
Alle Rechte bei FEIN, insbesondere für den Fall der Schutzrechtanmeldung.
Jede Verfügungsbefugnis wie Kopieren und Weitergabe liegt bei FEIN. Sahre / MVK 04 / 2009
Hedensted / Grit
Table of contents
1. Drive wheel
1.1. Drive wheel - dismounting
1.2. Drive wheel - mounting
1.3. Adjusting of grinding belt
2. Contact wheel
2.1. Contact wheel - dismounting
3. Gas spring
3.1. Gas spring - dismounting
3.2. Gas spring - mounting
4. Motor
4.1. Motor - dismounting
5. Switch box
5.1. Connection diagrams
5.2. Switch box - dismounting
6. Most common spare parts

GRIT by FEIN
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Hedensted / Grit
1. Drive wheel
In case of growing noise level or vibrations the Grit Machine must be stopped to
check the drive wheel. A new drive wheel is always crowned and balanced. During the grinding process
a large volume of grinding dust is produced. This dust can be easily fastened at the inner surfaces
(look at picture) of the drive wheel and is causing an unbalance in the drive wheel.
Another reason for vibrations can be a broken hub on the inner site of the drive wheel.
It can caused by a failure in the aluminium casting process of the drive wheel.
In case of a heavy dust contamination, the drive wheel
has to be dismounted and checked from both sides.
If necessary the drive wheel has to be changed.
A broken hub can‘t be detected by opening the machine housing.
If there are strong vibrations without heavy dust contamination the
drive wheel has to be dismounted.
Is there a broken hub the drive wheel has to be changed.

GRIT by FEIN
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Jede Verfügungsbefugnis wie Kopieren und Weitergabe liegt bei FEIN. Sahre / MVK 04 / 2009
Hedensted / Grit
Drive wheel - Polyurethane
Standard on GI 75 - Machines
1. Drive wheel

GRIT by FEIN
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Hedensted / Grit
1. Drive wheel
Normal wear
New condition
„crowned“ surface
If the grinding belt gets difficult to adjust or steer, you must check the surface of the drive wheel.
On a new drive wheel the surface is crowned (left picture). If crowning worn out or if irregular wearing
of the surface has occurred the drive wheel must be replaced. Depending on working intensity
the endurance is very different. It concerns drive wheels made of aluminiumn as well as drive wheels
with polyurethane.
The wearing is perceptible when the grinding belt starts moving and it‘s impossible to steer!

GRIT by FEIN
Alle Rechte bei FEIN, insbesondere für den Fall der Schutzrechtanmeldung.
Jede Verfügungsbefugnis wie Kopieren und Weitergabe liegt bei FEIN. Sahre / MVK 04 / 2009
Hedensted / Grit
1. Drive wheel
The pictures on the left shows an irregular wear out on
an unbalanced driving wheel because of a
heavy grinding contamination.

GRIT by FEIN
Alle Rechte bei FEIN, insbesondere für den Fall der Schutzrechtanmeldung.
Jede Verfügungsbefugnis wie Kopieren und Weitergabe liegt bei FEIN. Sahre / MVK 04 / 2009
Hedensted / Grit
1.1. Drive wheel - dismounting
1. Open the side door and take it off.
2. Loosen fixing screws of the cover for surface grinding table.
3. Cover for surface grinding table must be taken off.
Tool :
Allen key 6 mm