Page 1
Operating Instructions
K-POWERgrip EWL 4941.
Always on the safe site.
Page 2
KaVo Elektrotechnisches Werk GmbH
Wangener Straße 78
D-88299 Leutkirch
Page 3
1
K-POWERgrip EWL 4941.
A 1 User information ................................................................................................................................................................2
A 1.1 Meaning of the pictograms ................................................................................................ ..........................................2
A 1.2 Important information ..................................................................................................................................................2
A 1.3 Precautions ..................................................................................................................................................................2
A 1.4 Purpose and applications ............................................................................................................................................3
A 1.5 Technical data ........................................................................................................... ...................................................3
A 2 Scope of delivery - accessory ..........................................................................................................................................4
A 2.1 Scope of delivery ........................................................................................................................................................4
A 2.2 Accessory ....................................................................................................................................................................4
A 3 Description ..........................................................................................................................................................................4
A 4 Preparations for commencing operation ..........................................................................................................................5
A 4.1 Commencing operation ................................................................................................................................................5
A 5 Operation ............................................................................................................................................................................5
A 5.1 Inserting / changing the tool ........................................................................................................................................5
A 5.2 Operation ....................................................................................................................................................................5
A 6 Maintenance ........................................................................................................................................................................6
A 6.1 Weekly cleaning of chuck and handpiece part .............................................................................. ..............................6
A 6.2 Replacing the ball bearings ........................................................................................................................................7
A 6.3 Changing connecting cable ........................................................................................................................................9
A 7 Malfunctions ......................................................................................................................................................................10
Spare parts ..........................................................................................................................................................................12
Guarantee conditions ..........................................................................................................................................................14
EC- Declaration of conformity..............................................................................................................................................15
Page 4
2
K-POWERgrip EWL 4941.
KaVo assumes no responsibility for damage
arising through:
• external influences (poor quality of the
media or inadequate installation)
• use of incorrect information
• improper use
• improperly performed repairs.
Repair and maintenance work - apart from
the activities described in these instructions
for use - may be performed only by qualified technical personnel.
In the event of modifications by third parties, the approvals become null and void.
KaVo recommends using only original
spare parts for operation and for repair.
A 1.3 Precautions
Safe operation and protection of the unit are
ensured only through proper use in accordance with the instructions for use and
using the tools approved for the purpose.
The following should also be observed:
• the tool manufacturer's instructions,
• the work safety regulations,
• the accident prevention regulations.
■
Each time before switching on, check the
set speed.
■ Observe the permissible maximum speed
and maximum pressure of the tools
(according to tool manufacturer's
instructions).
■ Use safety screens when working with
rotating tools.
■ To avoid danger through accidental
switching on, place the handpiece on a
suitable shelf or tool support.
In the event of an unsatisfactory condition
of the unit or improper use, e.g.:
• unsuitable tools
• tool shafts not manufactured according to
DIN-ISO
• improper use or use not in accordance
with the purpose
• unapproved speeds for tools used
• incorrect clamping of the tools in the
chuck
• insufficient retaining force of the chuck
(wear, soiling, failure to follow the product care instructions for the chuck system,
etc.)
• different sizes of tool shaft and chuck
• lack of regular cleaning of the chuck
• failure to follow the maintenance instructions
• failure to comply with the accident prevention regulations (e.g. failure to use
safety screens, safety devices, handpiece
supports, etc.)
• failure to take into account signs of wear
and damage
• tool shafts which have slipped out (potential danger = bending of the tool shafts)
there is a danger of injury and damage to
material and unit, e.g. due to:
• Bending of the tool shafts
• Accidental withdrawal of the tools from
the chuck
• Breaking or splintering of the tool.
A 1 User information
A 1.1 Meaning of the pictograms
Situations where failure to follow the
instructions may lead to danger,
damage to material or operating faults.
Important information for operator
and engineer.
Automatic mode
Automatic sequence
Close, screw in,
fasten, etc.
Open, release, loosen
+
more, higher
- less, lower
∞ Continuous operation
Time, time sequence
Disconnect mains plug
A 1.2 Important information
The instructions for use should be
read by the user before starting up
the unit for the first time, in order to avoid
incorrect operation and other damage. If
other language versions are required,
please request these from your responsible
KaVo agent. Duplication and distribution
of the instructions for use (IU) require
KaVo's prior consent.
All technical data, information and properties of the product described in the IU correspond to the state on going to press.
Modifications and improvements to the
product as a result of new technical developments are possible.
This does not imply any right to retrofitting
of existing units.
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3
K-POWERgrip EWL 4941.
A 1.4 Purpose and applications
K-POWERgrip EWL 4941 handpieces are
versatile and very particularly suitable for
working on crowns and bridges.
A 1.5 Technical data
K-POWERgrip type EWL 4941
Length: 165 mm
Handpiece part: max. ∅ 29 mm
Motor part: max. ∅ 28 mm
Weight: approx. 250 g
with connecting cable approx. 355 g
Output power max. 150 watt
max. 7 Ncm
Speed range 1,000-50,000 min
-1
Pollution level: 2
Overvoltage category: ll
Ambient conditions:
Permitted in interior rooms
Permissible ambient
temperature range of 5° C - 40° C
Permitted to max. relative humidity 80%
We reserve the right to make technical
modifications.
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4
K-POWERgrip EWL 4941.
A 2 Scope of delivery - accessory
A 2.1 Scope of delivery
K-POWERgrip EWL 4941
with chuck ∅ 2.35 mm
Care set 0.411.3180
Instructions for use 1.002.3824
A 2.2 Accessory
Available on request:
Handpiece support 4850 0.642.0352
Chuck, ∅ 3.0 mm 0.674.4881
Chuck, ∅ 3.175 mm 0.674.4891
(Recommended for work at high speeds
and with large-diameter instruments.)
Tools for changing the ball bearing:
D Key 0.411.3962
E Socket wrench 0.411.2310
A 3 Description
@ Cover (3 covers as spare parts included
in care set)
” Straight pin
# Grip tip
£ K-POWERgrip handpiece part
fi K-POWERgrip motor part
Ì Chuck
\ Connecting cable
A Chuck key
B Clip
C Cleaning brush
D Key
E Socket wrench
D
E
0.411.3180
AB
C
@
”
#
£
@
Ì
fi
\
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5
K-POWERgrip EWL 4941.
A 4 Preparations for commencing
operation
Do not operate or lay down your
K-POWERgrip handpiece EWL
4941, unless an instrument or the test pin is
clamped in the chuck. When the chuck is
open, the
K-POWERgrip handpiece, is locked, and
inadvertent use will cause the
K-Control control unit to switch to
malfunction. Malfunction indicator lights
up or begins to flash.
A 4.1 Commencing operation
The K-POWERgrip handpiece EWL 4941
can be operated with the K-Controll unit:
Knee-operated control unit EWL 4960
benchtop-control unit EWL 4965
Foot-control unit EWL 4970
A 5 Operation
A 5.1 Inserting / changing the tool
During commissioning and each time
when operating the K-POWERgrip
handpiece EWL 4941, it is essential to
observe the points mentioned in the section
«A 1.3 Precautions“!
Hold handpiece element £ tighty and turn
motor element fi in the directionof the
arrow until the chuck Ì is completely
open.
Remove instrument you were using or test
pin # from the chuck Ì and insert a new
tool into the chuck Ì; press on instrument
or pin until it catches.
Close the chuck Ì by turning the motor
element fi in the direction of the arrow
until it catches. Opening the chuck
A 5.2 Operation
If the workplace is unsuitably illumi-
nated, a stroboscopic effect may
occur. This causes the tool to appear stationary at certain speeds. The situation can
be remedied only by acquiring suitable
lighting.
Each time before switching on, check the
desired speed on the controller and if necessary adjust.
Put the K-POWERgrip handpiece EWL
4941 into operation according to the
instructions for use of the up-circuit controller.
Ì
£
”
fi
fi
Ì
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6
K-POWERgrip EWL 4941.
A 6 Maintenance
■
Repair and maintenance work on the
electrical part of the unit may be performed
only by qualified technical personnel or
trained persons who have been made aware
of the safety regulations. Before
maintenance work, disconnect the mains
plug or isolate the unit completely from the
power supply so that there is no power to
the unit.
■
On no account may the K-POWERgrip
handpiece EWL 4941 be cleaned with
compressed air; use the cleaning brush
from the care set.
■
On no account should cleaning agents
(such as spray cleaner, degreaser, etc.) be
introduced into the interior of the
handpiece.
■
using original chuck key A
A 6.1 Weekly cleaning of chuck and
handpiece part
Removing the chuck
Remove previously used tool or straight
pin from chuck and take off cover @
(3 covers as spare parts in care set).
Push tool or straight pin into chuck as far
as it will go and close chuck.
Slowly turn the shaft ” until clip B can be
inserted into grip tip # with little resistance.
Open the chuck. Unscrew the chuck using
original chuck key A and inserted straight
pin or tool ”.
Clean the front opening of the
K-POWERgrip handpiece EWL 4941 with
a brush or with the cleaning brush
supplied. Clean chuck thread, surface of
the original chuck A and rotor cone and
lightly grease.
Installing the chuck
Insert chuck incl. straight pin ” using
original chuck key A and tighten.
Mount cover @ again.
Remove clip B from grip tip # and close
chuck with inserted straight pin again.
”
@
A
@
B
#
Ì
Ì
”
#
£
”
A
B
C
r
l
e
ean
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7
K-POWERgrip EWL 4941.
A 6.2 Replacing the ball bearings
Dismantling
Slowly turn the shaft by the straight pin ”
until clip B can be inserted into grip tip #
with little resistance.
.
Loosen grip tip in direction of arrow
and remove clip.
Completely unscrew grip tip and remove
felt washer \.
Grip handpiece part £ and loosen threaded ring | with socket wrench E and
unscrew.
Remove complete shaft unit · from
K-POWERgrip handpiece EWL 4941.
Remove ball bearing ¯ and bush » from
shaft.
Hold shaft with key D and loosen nut „
with socket wrench E - Note left-handed
thread.
Remove nut „ with ball bearing ‰ from
shaft.
|
”
#
£
E
B
E
D
¯
»
„
‰
\
·
„
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8
K-POWERgrip EWL 4941.
Assembly
Push new ball bearing ‰ onto shaft. Hold
shaft with key D and screw on nut „
again with socket wrench E - note the lefthanded thread.
Push ball bearing ¯ (with the two O-rings
facing the inside of the handpiece) and
bush » onto the shaft as far as it will go.
While rotating the shaft unit ·, insert it
into the K-POWERgrip handpiece EWL
4941.
Grip handpiece part £ and tighten the
threaded ring | with socket wrench E.
Insert new felt washer \ into threaded
ring |.
Hold K-POWERgrip handpiece EWL
4941, screw on grip tip by hand and tighten
carefully with clip B. Insert cover @.
To increase the life of the ball bear-
ing, KaVo EWL recommends:
After changing the ball bearing, allow the
handpiece to run without an inserted instrument for about 60 minutes at 10,000 to
15,000 min
-1
.
¯
»
·
£
E
D
|
\
@
‰
„
E
B
|
Page 11
9
K-POWERgrip EWL 4941.
A 6.3 Changing connecting cable
Unscrew the connecting cap » from the
K-POWERgrip-Motor element fi and pull
out the connection cable ‰ in the direction
of the arrow .
Insert new connecting cable ‰ (3-pin)
completely into motor part fi and screw
on connecting cap » again.
»
fi
fi
„
»
‰
Page 12
A 7 Malfunctions
Repair and maintenance work on the
electrical part of the unit may be performed only by specialists or by persons
who have been trained in the factory and
have been made aware of the safety regulations. Before opening the housing parts,
disconnect the mains plug or isolate the
unit completely from the power supply so
that there is no power to the unit.
C • K-POWERgrip handpiece EWL 4941 is
blocked, possibly due to open chuck
system.
R • Close chuck correctly with inserted tool
(see A 5.1).
C • Break in connecting cable.
R • Check connecting cable incl. plug
devices and if necessary replace
(see A 6.3).
C • Fault in the electrical system of
K-POWERgrip EWL 4941controller.
R • Check controller or have repaired.
C • Diameter of tool shaft does not agree
with chuck.
R • Use chuck or tool with appropriate
diameter.
C • Chuck has become loose.
R • Insert chuck correctly (see A 6.1).
C • Chuck is worn.
R • Replace chuck (see A 6.1).
F = Fault C = Cause R = Rectification
F • Tool is no longer adequately retained
in the chuck.
F • K-POWERgrip handpiece no longer
rotates or stops from time to time.
10
K-POWERgrip EWL 4941.
Page 13
C • Ball bearing faulty owing to wear or
soiling.
R • Check ball bearing and if necessary
replace.(see A 6.2)
C • Prolonged operation under very high
load.
R • Eliminate cause of high load, if neces-
sary increase speed or use tools with
smaller diameter.
C • Electronics of controller faulty.
R • Check controller or have repaired.
F = Fault C = Cause R = Rectification
F • Loud running noise or K-POWERgrip
handpiece EWL 4941 heats up
11
K-POWERgrip EWL 4941.
Page 14
Spare parts
12
K-POWERgrip EWL 4941.
A
0.200.0836
0.200.0837
0.201.8083
0.674.4861
0.202.0021
B
0.674.7942
0.222.4018
0.200.6095
0.220.0778
1.002.3648
0.220.0779
0.200.6093
0.200.6219
B
C
0.674.7392
1.001.6751
0.224.7048
POWERgrip
0.223.0111
0.223.0396
0.674.8472
0.200.1045
0.223.0082
0.070.3274 ø 5 mm*
1.002.3600
POWERgrip
0.200.6320
0.674.4701
0.200.6155
0.674.8962
0.674.8982
m
1.002.3644
Page 15
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K-POWERgrip EWL 4941.
A
1.000.1260
0.674.4871 ø 2,35 mm
0.674.4881 ø 3,0 mm
0.674.4891 ø 3,175 mm
0.674.9012
0.200.6220
0.674.9002
0.222.4044
0.200.1252
0.202.0021
0.674.8212 ø 2,35 mm / ø 3,00 mm
0.674.8482 ø 3,175 mm
0.200.0826
0.200.6199
1.000.3586
0.674.8752
0.674.4511
0.674.8772
0.200.6095
0.220.0044
0.674.7602
0.200.6303
0.674.7642
1.002.2896
0.674.4152
0.674.4172
0.674.4162
0.200.6323
0.674.8732
Page 16
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K-POWERgrip EWL 4941.
Guarantee conditions
Under valid KaVo EWL delivery and payment conditions, KaVo EWL gives a guarantee of satisfactory function and freedom from faults
in material and manufacture for the duration of 6 months from the date of sale certified by the vendor. After expiry of the warranty, KaVo
gives a guarantee of another 6 months for damage attributable to deficiencies in the material or in manufacture.
In the case of justifiable complaints, KaVo EWL shall supply spare parts or carry out repairs free of charge. KaVo EWL accepts no
liability for defects and their consequences which have arisen or could have arisen as a result of natural wear, improper handling, cleaning
or maintenance, noncompliance with the maintenance, operating and connecting instructions, corrosion, impurities in the air supply or
chemical or electrical influences which are unusual or not admissible in accordance with KaVo's instructions. The guarantee shall become
null and void if defects or their consequences can be attributed to interventions in or modifications to the product. Guarantee claims can
only be validated if they are notified immediately in writing to KaVo EWL.
Page 17
EC- Declaration of conformity
15
K-POWERgrip EWL 4941.
Page 18
1.002.3824
●
RB
●
05/03
●
GB
●
01.40
DD--8888229999 LLEEUUTTKKIIRRCCHH..
TTeelleeffoonn 00 7755 6611//8866--115500 ·· FFaaxx 0077556611//8866--226655
IInntteerrnneett:: wwwwww..kkaavvoo..ccoomm
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