Retsch BB 51 User manual

Jaw Crusher Type BB 51
Operating Instructions
©Retsch GmbH, 42781 Haan, Rheinische Str.36, Germany, Doc. No. GB 98.056.9999

17.12.1998 ©Retsch GmbH 2 Doc. No. GB 98.056.9999
Notes on the operating instructions
These operating instructions for the jaw crusher type BB 51 provide all
the necessary information on the topics listed in the table of contents.
The guide the target group(s) defined for the relevant subjects in safe
and proper handling of the BB 51. Knowledge of the relevant chap-
ters by the appropriate target group(s) is essential for safe and proper
handling.
This technical documentation comprises a reference work and a train-
ing guide. The individual chapters are self-contained units.
These operating instructions do not contain any instructions on re-
pairs. Should any repairs become necessary, please contact your sup-
plier or Retsch GmbH.

17.12.1998 ©Retsch GmbH 3 Doc. No. GB 98.056.9999
Notes on the operating instructions ...................2
Safety ........................................4
Notes on safety ................................4
Warning notes.................................5
Repairs .....................................5
Confirmation .................................5
Technical data ..................................6
Use for the intended purpose .......................6
Description of function...........................6
Protective devices ..............................7
Gap width adjustment ...........................7
Throughput, output fineness .......................7
Rated capacity of withdrawable receptacle ...............7
Noise data : ..................................7
IP ratings....................................7
Rated power ..................................7
Dimensions ..................................7
Required mounting surface ........................7
Transport and installation ..........................8
Packaging ...................................8
Transport ...................................8
Interim storage ................................8
Supply schedule................................8
Parameters for the installation location .................9
Installation ...................................9
Electrical connection ............................9
Operation .....................................10
Controls and operation ...........................10
Schematic drawing of the controls: ...............10
Overview of control elements ..................11
Operation of the BB 51 ............................12
Switching ON and OFF ..........................12
Set gap width to 00.0 ............................12
Starting the crushing process .......................13
Feeding in the input material .......................13
Interrupting the crushing process ....................14
Continuing the crushing process .....................14
Emptying the drawer ............................14
Notes on working procedures .......................15
General .....................................15
Input grain size ................................15
Quality of process material.........................15
Transport handles ..............................16
Cleaning ....................................16
Cleaning the drawer recess ....................16
Cleaning the crushing chamber .................17
Cleaning the interior of the casing ...............17
Maintenance ..................................17
Replacing jaws ................................18
Accessories ..................................19
Copyright ...................................19
Modifications .................................19
Safety regulations (table) ..........................20
Warranty conditions ..............................21

Safety
Target group: All persons dealing with the machine in any way
The BB 51 is a modern, powerful product from Retsch GmbH. It re-
flects the state of the art. When the machine is handled correctly by
persons familiar with this technical documentation, it is completely
safe and reliable in operation.
Notes on safety
You, as the operator, are responsible for ensuring that the persons ap-
pointed to work with the BB 51:
• have read and understood all the stipulations of the chapter
on safety,
• are familiar before commencing work with all instructions
and regulations for the relevant target group,
• have access to the technical documentation for this machine
at all times and without difficulty.
Ensure that new staff have been familiarised with the rules for safe and
proper handling before commencing work on BB 51 either by oral in-
struction by a competent person and/or by this documentation.
Incorrect operation can lead to damage or injury. You are responsible
for your own safety and that of your staff.
Ensure that no unauthorised persons have access to the BB 51.
For your own protection, have your staff confirm that they have been
instructed in operation of the BB 51. A draft of an appropriate form
can be found at the end of the chapter on safety.
No liability in any form will be accepted for damage or injury resulting
from failure to observe the following notes on safety
17.12.1998 ©Retsch GmbH 4 Doc. No. GB 98.056.9999

Warning notes
We use the following symbols to warn against:
!
Personal injury
Damage to property
Repairs
These operating instructions do not contain any instructions on re-
pairs. For your own safety, only have repairs performed by Retsch
GmbH or an authorised agent (service technicians).
In such a case, please inform:
The Retsch agency in your country
Your supplier
Retsch GmbH direct
Your service address:
_____________________________
_____________________________
_____________________________
_____________________________
Confirmation
I have read and understood the foreword and the chapter on safety.
__________________________________________________
Signature of the operator
__________________________________________________
Signature of service technician
17.12.1998 ©Retsch GmbH 5 Doc. No. GB 98.056.9999

Technical data
Target group: Operators
Machine type designation: BB 51
Use for the intended purpose
The BB 51 is suitable for crushing of medium to extremely hard sub-
stances and brittle and hard/tough materials. The achievable final out-
put fineness can be up to 0.5 mm and less, depending on the input ma-
terial.
The maximum input grain size is 35 mm.
The materials which can be crushed in the BB 51 include the follow-
ing:
Bakelite // bauxite // concrete // dolomite // ores // feldspar //
granite // graywacke // glass // limestone // gravel // coal // coke
// corundum // quartz // salts // refractory clay // slag // silicates
// silicon // sintered materials // cement clinker, etc.
This machine is not designed as a production machine but as a labora-
tory machine intended for 8 hour single shifts with 30% total opera-
tion time.
Should you require any further details, the Retsch applications labora-
tory will be pleased to assist.
Do not modify the machine in any way, and use only spare parts and
accessories approved by Retsch.
The conformity with European Directives declared by Retsch
will otherwise be invalidated.
Furthermore, this will lead to all warranty claims being ren-
dered null and void.
Description of function
Comminution in the BB 51 is effected by means of pressure.
The crusher chamber 1is funnel shaped and tapers down towards
the output end in accordance with the gap width which is infinitely
adjustable in steps of 0.1 mm.
The BB 51 has a gap width adjustment mechanism 5linked to a fixed
crusher arm 4and a moving crusher arm 3. Both crusher arms are
fitted with replaceable jaws 2between which comminution takes
place by means of pressure.
The eccentric motion ( eccentricity=2.4mm / 960min-1 at 50Hz and
1028min-1 at 60Hz ) of the moving crusher arm 3steadily moves the
input material until it is fine enough to pass through the set gap
width and fall into a withdrawable receptacle 6.
The convex form of the replaceable jaws 2, which may be made of
various different materials accelerates the process of comminution
while preventing compaction and formation of bridges.
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17.12.1998 ©Retsch GmbH 7 Doc. No. GB 98.056.9999
Protective devices
The crusher chamber of the BB 51 is enclosed on all sides by a robust
steel plate casing.
The BB 51 can be safely started up even when the hopper lid is open
and the output receptacle withdrawn, as its design in compliance with
EN 294 precludes any inadvertent insertion of hands or objects.
A main switch fitted with a thermal overload relay on the back of the
machine protects against current overload.
Gap width adjustment
From 0 to approx. 10 mm by handwheel in 0.1 mm steps. Digital gap
width indicator.
Throughput, output fineness
The performance data, throughput and achievable final output fineness
are dependent on the breakage behaviour and hardness of the process
material and on the gap width set. They can only be determined em-
pirically.
Rated capacity of withdrawable receptacle
Approx. 1000 ml
Noise data :
Noise measurement to DIN 45635-031-01-KL3
The noise levels are also influenced by the properties of the input ma-
terial.
Example 1:
Sound power level LWA = 78,3 dB(A)
Workplace related emission level LpAeq = 68,7 dB(A)
Service conditions :
Input material: none
Crushing members : zirconia jaws
Gap width set: 2mm
Example 2:
Sound power level LWA = 91,7 dB(A)
Workplace related emission level LpAeq = 83,7 dB(A)
Service conditions :
Input material : quartz gravel of grain size approx. 25mm
Crushing members : zirconia jaws
Gap width set: : 2mm
Output grain size: < 5 mm
IP ratings
IP20
IP00 on the side ventilation slits
Rated power
1100 W
Dimensions
Height: approx. 510mm, Width: approx. 360 mm, Depth: approx. 580 mm
Weight: approx. 79 kg / net
Required mounting surface
(462 mm x 1000 mm; no safety clearances necessary!)

Transport and installation
Target group: Operators
Packaging
The packaging is suitable for the mode of transport selected. It com-
plies with the general packaging regulations.
Please keep the packaging for the duration of the guarantee pe-
riod, as your guarantee claim will be endangered in the case of a
complaint or return of the machine in inadequate packaging.
Transport
Fig.1
The handles M available as accessories (Order No. 32.825.0001)
can be used to lift and carry the BB 51. Fig.1
The BB 51 must not be thrown, subjected to impact or shock
during transport. The electrical and mechanical components may
otherwise be damaged
Temperature fluctuations
When there are severe temperature fluctuations (e.g. during air
transport) the BB 51 is to be protected from condensation. The
electrical components may otherwise be damaged.
Interim storage
Also ensure that the BB 51 is stored in a dry location for interim peri-
ods.
Supply schedule
• BB 51 with built-in crusher arms and wearing plates.
• 1 mains power cable.
• 1 instruction manual.
Check the delivery for completeness, including the accessories ordered
individually.
Check the perfect function of the BB 51 (see chapter on operation).
On incomplete delivery and / or transport damage, you must no-
tify the forwarding agent and Retsch GmbH immediately (within
24hrs). It may not be possible to take account of later com-
plaints.
17.12.1998 ©Retsch GmbH 8 Doc. No. GB 98.056.9999

Parameters for the installation location
Ambient temperature:
5°C to 40°C
If the ambient temperature falls below or exceeds the limits
specified, the electrical and mechanical components may be dam-
aged or the performance data changed to an unknown extent..
Humidity :
Maximum relative humidity 80% at temperatures up to 31°C,
decreasing in a straight line to 50% relative humidity at 40°C.
At higher humidity, the electrical and mechanical components
may be damaged and performance data changed to an unknown
extent.
Site altitude:
max. 2000 m above sea level
Installation
Place the BB 51 jaw crusher on an even and stable surface, eg. a labo-
ratory bench.
Electrical connection
• Consult the type plate for the voltage and frequency of the BB
51.
• Ensure that the values are in agreement with the mains power
supply.
• Connect the BB 51 to the mains using the cable supplied.
Failure to observe the values on the type plate can result in dam-
age to electronic or mechanical components.
17.12.1998 ©Retsch GmbH 9 Doc. No. GB 98.056.9999

Operation
Target group: Operators
Controls and operation
Schematic drawing of the controls:
Front view
ACHTUNG!
PRIOR TO ANY OPENING OF THE HOUSING
DISCONNECT UNIT FROM MAINS!
RETIRER LA PRISE AVANT
L'OUVERTURE DU BOITIER!
VOR ÖFFNEN DES GEHÄUSES
NETZSTECKER ZIEHEN!
Rear view
17.12.1998 ©Retsch GmbH 10 Doc. No. GB 98.056.9999

Overview of control elements
Item Element Illustration Function
A Mains power cable Connects the machine to the mains power supply (earthed
socket)
B
Main switch ON/OFF
with overload protection
Connects and disconnects the controller from the mains
power supply.
Disconnects the motor from the mains power supply in the
event of overload.
C START button
Starts the BB 51.
Green LED lights up when the button is pressed.
D STOP button
Stops BB51.
Red LED lights up when the machine is switched on.
Puts the BB 51 in standby mode when pressed a second time.
E Gap width indicator
Indicates the gap width set in mm.
F Handwheel for setting gap
width
Turn clockwise to close the gap. Turn anti-clockwise to open
the gap.
G Gap zero adjustment but-
ton
Press to reset the indicator display to 00.0.
H Feed hopper and lid
T
akes the input material. Prevents the input material from
bouncing back and protects against excessive release of dust.
K Drawer
See preceding page For insertion of receptacle L.
L Receptacle with capacity
of approx. 1000 ml
See preceding page Holds the crushed output.
M Transport handles See preceding page For lifting and carrying the BB 51.
17.12.1998 ©Retsch GmbH 11 Doc. No. GB 98.056.9999

Operation of the BB 51
Target group: Operators
Switching ON and OFF
Fig.2
Fig.3
The main switch B. is located on the back of the BB 51 Fig.2
• Switch the main switch B on.
The red LED above the STOP button D lights up.
The BB 51 is now ready for operation.
Set gap width to 00.0
The gap width must only be adjusted when the machine is empty.
There must be no input material in the crusher chamber or feed
hopper.
Before starting the BB51 turn the handwheel Fthrough two revolu-
tions anti-clockwise so that the crusher jaws are out of contact with
one another.
• Press the START button C. Fig.3
The red LED above button D goes out, the green LED above but-
ton Clights up, the indicator display Ereads 00.0. The machine
starts up.
• Turn the handwheel Fclockwise until you hear the sound of the
crusher arms meeting.
• Press button G.
The indicator display Ereads 00.0.
Gap width and indicator now tally with one another.
• Turning the handwheel Fcloses the gap.
• Turning the handwheel Fopens the gap.
Before adjusting or starting the BB51 you must turn the handwheel
Fthrough two revolutions anti-clockwise.
The crusher jaws are then safely out of contact with one an-
other, thus preventing jamming and possible damage to the
jaws of the BB51.
Adjustment should be carried out regularly so as to ensure that the
indicator display and the actual gap width tally. The greater the load
on the BB 51 and the harder and more abrasive the input material,
the more often a zero point adjustment must be carried out in order
to compensate for wear.
The reading on the indicator display will otherwise not tally
with the actual gap width.
The BB 51 must only be adjusted when the machine is empty.
Jamming will result if there is any material in the crusher chamber or
feed hopper before starting.
This may result in damage to mechanical components.
17.12.1998 ©Retsch GmbH 12 Doc. No. GB 98.056.9999

Starting the crushing process
Fig.4
• Carry out adjustment as described in the preceding section.
• Press the START button C. Fig.4
The green LED above button Clights up, the BB 51 starts up.
• Set the desired gap width using the handwheel F.
Turn anti-clockwise to open the gap.
Turn clockwise to close the gap.
Display Eindicates the gap width in mm.
The end of the crushing process is signalled by a change of noise and
the machine can be switched off.
Feeding in the input material
Fig.5
The feed hopper H and the crusher chamber can take input material up to
a grain size of 35 mm.
The feed hopper is not however intended for storage of process material:
its function is solely that of feeding material into the crusher chamber. It
also prevents inadvertent reaching into the crusher chamber, and stops
process material from being ejected.. Fig.5
• Check that the drawer and inserted receptacle are pushed in.
• Open the lid on the feed hopper H.
• Feed the material into the hopper.
• Close the lid on the hopper H.
Feed material into the hopper only when the machine is in operation.
Mechanical components may otherwise be damaged.
The maximum quantity of input material is limited by the capacity of the
withdrawable receptacle. The useful capacity of the receptacle will depend
on the properties of the input material. Remember to empty the receptacle
in good time.
Crushed material must not be allowed to back up in the crusher
chamber.Mechanical components may otherwise be damaged.
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Interrupting the crushing process
The BB 51 must only be stopped when there is no more input material
in the hopper and crushing chamber.
Mechanical components might otherwise jam and be damaged
when the machine is restarted.
Fig.6
• Press the STOP button D. Fig.6
The red LED above button D lights up, the green LED above button C
goes out. The machine stops.
• Press the STOP button Da second time.
The red LED stays lit, the display goes out and the machine is in
standby mode. The last gap width setting is retained and the machine is
still ready for operation.
The crushing process can be continued at any time, provided that the
BB 51 has not been switched off at the main switch on the back of the
machine and the red LED above button Dis lit up.
Continuing the crushing process
• Press the START button C. Fig.6
The red LED above button Dstays lit, the display indicates the last
gap width setting.
• Press the START button Ca second time.
The crushing process continues using the last gap width setting.
Emptying the drawer
Fig.7
• Stop the BB 51
• Pull out the drawer Kto the stop.
• Remove the inserted receptacle Land empty it.
The maximum capacity of the receptacle Lfor particular types of in-
put material must be determined empirically.
When emptying the withdrawable receptacle Lfirst ensure that the B
51 has run empty before stopping it, ie. that there is no more input
material in the crushing chamber or the feed hopper.
The crushed material will otherwise fall into the drawer recess
rather than into the receptacle.
Be sure to always empty the drawer in good time so that the top of the
heap of crushed material does not protrude into the crushing chamber.
Mechanical components might otherwise be damaged.
17.12.1998 ©Retsch GmbH 14 Doc. No. GB 98.056.9999

Notes on working procedures
Target group: Laboratory technicians
General
The BB 51 is a robust benchtop machine which can predominantly be
used for preliminary pulverisation of hard or brittle materials.
The performance data, throughput and achievable final fineness are
dependent on the breakage behaviour and hardness of the process ma-
terial, and on the gap width set.
This machine is not designed as a production machine but as a labora-
tory machine intended for 8 hour single shifts with 30% total opera-
tion time.
Do not modify the machine in any way, and use only spare parts and
accessories approved by Retsch.
The conformity with European Directives declared by Retsch
will otherwise be invalidated.
Furthermore, this will lead to all warranty claims being ren-
dered null and void.
Input grain size
The maximum input grain size is determined by the size of the intake
opening, and is max. 35 mm on the BB 51.
Quality of process material
In principle, any hard and brittle process material with a Mohs hard-
ness >3 can be crushed in the BB 51.
Moist or greasy process material with a Mohs hardness <3 tends
merely to compact or cake in the crusher chamber as a result of the
pressure applied by the crusher jaws.
Proper crushing is not possible in such cases.
17.12.1998 ©Retsch GmbH 15 Doc. No. GB 98.056.9999

Transport handles
Fig.8
A pair of handles fitting on to the top right and left hand sides of the BB
51 for convenient portability can be supplied as accessories (Order No.
32.825.0001).
• Insert and tighten the tommy screws Gtogether with the transport
handle TG in the threaded borings (cf. arrow in Fig.8).
The handles can be left on the BB 51. They increase the overall width of
space required for the machine on the bench by approx. 115 mm.
Cleaning
!
Do not clean the BB 51 with running water.
Lethal hazard of electric shock!
Use only a damp rag.
Solvents must not be used, as they would wash out the grease
packing.
Cleaning the drawer recess
Fig.9
From time to time the recess containing the drawer must be cleaned.
A regular visual check on the state of the recess should be made.
• Pull out the mains plug.
• Pull the drawer out to the stop.
• Remove the inserted receptacle.
• Loosen but do not remove the two cheesehead screws ZS with
an Allan key AF4 Fig.9
• Slide the two cheesehead screws ZS together with the plate PL
fitted behind the drawer to the left.
• Take out the drawer.
The recess can now be cleaned.
Follow the same procedure in reverse to reassemble.
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Cleaning the crushing chamber
Fig.10
From time to time the crushing chamber should be cleaned. An Allan
key AF 4 is necessary for this.
Fig.10
• Pull out the mains plug.
• Set the gap width to maximum.
• Remove the cheesehead screw Swhile at the same time lifting the
feed hopper from its mounting plate.
• Remove the feed hopper.
The crushing chamber is now accessible and can be cleaned using a
small brush or vacuum cleaner of the kind used on computers.
Follow the same procedure in reverse to reassemble.
!
Operation of the BB 51 with the feed hopper removed is not permis-
sible.
Risk of crushing fingers and hands!
Cleaning the interior of the casing
Fig.11
Fine dust may get inside the casing through holes in the drawer recess
and this interior space should be cleaned from time to time using, for
example, a vacuum cleaner of the kind used on computers.
To do this, first dismantle the feed hopper using an Allan key AF4.
Fig.11
• Pull out the mains plug.
• Remove cheesehead screw S.
• Remove the feed hopper.
The interior of the casing is now accessible for cleaning.
Follow the same procedure in reverse to reassemble.
Maintenance
The BB 51 is maintenance-free and no settings need be adjusted when
the machine is used for its designated purpose.
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Replacing jaws
The following tools are needed:
• Allan key AF 2,5
• Allan key AF4
• Allan key AF5
• Open jawed spanner AF8
• Philips head screwdriver size 2
Fig.12
• Pull out the mains plug.
• Remove the cheesehead screw Sch1 on the feed hopper using an Allan key AF4.
• Remove the feed hopper.
• Set the gap width to maximum by turning the handwheel anti-clockwise to the stop.
• Remove the screws S1 at the side using an Allan key AF4 and take off the top of the casing.
• Take care with the earth cable!
• Using a size 2 Philips head screwdriver, remove the four oval head screws Sch2 and remove the two cover plates.
• Using an open jawed spanner AF 8, remove the eight hexagonal cap screws Sch3
• Remove the two hexagonal cap screws Sch4 using an Allan key AF 2.5 and take out the plate.
• Pull the traverses upwards and out.
• Remove the four cheesehead screws Sch5 using an Allan key AF5. During assembling the tightening torque must not
exceed 10 Nm.
• Remove the shim K1.
• Change the jaws B1.
Follow the same procedure in reverse to reassemble.
!
Operation of the BB 51 with the feed hopper removed
is not permissible.
Risk of crushing fingers and hands!
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17.12.1998 ©Retsch GmbH 19 Doc. No. GB 98.056.9999
Accessories
• Order No. 05.242.0028 = Spare V-belt.
• Order No. 32.825.0001 = Transport handles, 1 pair.
• Order No. 22.048.0010 = Crusher jaws, tungsten carbide, 1 pair.
• Order No. 22.048.0011 = Crusher jaws, zirconia, 1 pair.
• Order No. 22.048.0012 = Crusher jaws, stainless steel, 1 pair.
• Order No. 22.048.0013 = Crusher jaws, special steel, 1 pair.
• Order No. 22.048.0014 = Crusher jaws, manganese steel, 1 pair.
• Order No. 22.711.0007 = Wearing plates, zirconia, 1 pair.
• Order No. 22.711.0008 = Wearing plates, tungsten carbide, 1 pair.
• Order No. 22.711.0009 = Wearing plates, stainless steel, 1 pair.
Copyright
This documentation may only be duplicated or passed on to third par-
ties, its contents passed on or otherwise used with the express approval
of Retsch GmbH.
Contraventions will give rise to liability for damages.
Modifications
We reserve the right to make technical modifications without notice.

17.12.1998 ©Retsch GmbH 20 Doc. No. GB 98.056.9999
Safety regulations (table) for the BB 51 with reference to the individual chapters
Subject Action Hazard
Modifications to the machine Do not modify the machine in any way, and use only
spare parts and accessories approved by Retsch.
The conformity with European Directives de-
clared by Retsch will otherwise be invalidated.
This will lead to all warranty claims being rendered
null and void..
Safety Failure to observe the notes on safety can lead to dam-
age to property and personal injury.
We accept no liability whatsoever for any damage or in-
jury resulting from non-observance of the notes on
safety.
Packing Please keep the packing for the duration of the guaran-
tee period.
Return of goods in inadequate packing may jeopardise
your entitlements under the guarantee.
Transport The BB 51 must not be thrown or otherwise subjected
to impact or vibration during transport.
Electrical and mechanical components may be damaged.
Temperature fluctuations When there is a likelihood of temperature fluctuations
the BB 51 must be protected against condensation.
Electrical components may be damaged.
Scope of supply In cases of incomplete delivery and/or transport dam-
age, you must notify the forwarding agent and Retsch
GmbH without delay (within 24 hours).
It may not be possible to accept subsequent complaints.
Ambient temperature Not below 5°C.
Not above 40°C.
Electrical and mechanical components may be damaged
and performance data change to an unknown extent.
Humidity Maximum relative humidity 80% at temperatures up to
31°C or 50% (decreasing in a straight line) at 40°C.
Electrical and mechanical components may be damaged
and performance data change to an unknown extent.
Electrical connection Mains power differs from the values on the type plate. Electrical components may be damaged.
Operation When starting, stopping or interrupting the operation
of the machine, ensure that the crushing chamber and
feed hopper are empty..
Mechanical components may be damaged by blockage..
Gap width adjustment Adjustment should be carried out regularly so as to en-
sure that the indicator display and the actual gap width
tally. The greater the load on the BB 51 and the harder
and more abrasive the input material, the more often a
zero point adjustment must be carried out in order to
compensate for wear.
The reading on the indicator display will otherwise
not tally with the actual gap width.
The BB 51 must only be adjusted when the machine is
empty.
Mechanical components may be damaged by blockage.
Feeding in the input material Feed material into the hopper only when the machine
is in operation..
Mechanical components may be damaged.
The maximum quantity of input material is limited by
the capacity of the withdrawable receptacle. The useful
capacity of the receptacle will depend on the properties
of the input material. Remember to empty the recepta-
cle in good time.
Crushed material must not be allowed to back up in
the crusher chamber.Mechanical components may
otherwise be damaged.
Interrupting the crushing process The BB 51 must only be stopped when there is no
more input material in the hopper and crushing cham-
ber.
Mechanical components might otherwise jam and
be damaged when the machine is restarted.
Emptying the drawer When emptying the withdrawable receptacle Lfirst
ensure that the B 51 has run empty before stopping it,
ie. that there is no more input material in the crushing
chamber or the feed hopper.
The crushed material will otherwise fall into the
drawer recess rather than into the receptacle.
Be sure to always empty the drawer in good time so
that the top of the heap of crushed material does not
protrude into the crushing chamber..
Mechanical components may be damaged.
Cleaning Do not clean the BB 51 under running water.
Using solvents is prohibited.
Lethal electric shock hazard!
Grease packings could be washed out.
Cleaning the crushing chamber Operation of the BB 51 with the feed hopper removed
is not permissible.
Risk of crushing fingers and hands!
Replacing crusher jaws Operation of the BB 51 with the feed hopper removed
is not permissible.
Risk of crushing fingers and hands!