Fein MSf 679 b User manual

To be handed to the workshop
Operating instructions
for the Angle Grinder type MSf
679 b
1. Technical Data
Type of current : "' (AC single phase)
Fuses for 220 V: 10 A slow or 15 A fast or automatic fuse 10 A type G.
'
Speed
Input Output
Net Weight
T ype
R.P.M. Watts Watts
I
lbs
kg
MSf 679b
5100 2000 1400 16
7,2
I
2. Construction
The angle grinder MSf 679 b is an electric tool of Class II
according to VDE regulations 0740. The protective insu la tion · is
additional to the normal insulation and protects the operator
against electric acciden ts caused by defective normal insulation.
The protective insulation is attained by the motor housing
made of polyamide- shockproof an d resistant to leakag e curren ts -
a
nd by in sulating the armature aga i nst th e pinion . The machine
is s upplied with a two- core cable w ithout earth wire a nd must
not be earthed. The dustproof switch is mounted in the handle.
The angle grinder is equipped with a protective motor switch.
When overloaded, it disconnects th e motor.
When th e prot ec tiv e motor switch is released, it can again be
con n ected after 20 or 30 seconds.
Switch must be in the "Off" position, before connectin g again
the protective motor switch.
The machine is test ed with the prescribed test v oltage of 4000 V.
It is radio suppressed according to radio interf ere nce VD E 0875.
Th e bevel gear hav e he li ca l teeth. Gears are l apped for accura te
meshing; both p ar ts to be supplied as pairs only . Gea rs a nd
bearings ar e protected aga inst dust ~ nd l oss of gre ase .
-
Th e slots for the coo l ing air of th e motor are lo cated in th e
gear head. They allow an additional cooling of the gear head.
BE 443/e GW 5. 73 . P.rint ed in German y
max.
Thread
Grinding wheel
periphera l
speed
of
I
ma x. dia I
ma x. w id th I
bore
type
in. I mm in. I mm
in.
i ft/s I m/s
spindle
mm
flexib le
grinding
11 13j,6
300
.,32
4 7
Ia 22.2 262 80 M 14
wheel
To p reven t the overbridg i ng of the insul a tion no addition al
markfng plates and signs mus t be ri vete d or scre wed on th e
housing . W e recommend the u se of transfers only.
3. Connection and operation
Main voltage must correspon d to the opera ti ng volt age marked
on the rating plate. Th e tool ca n be plugg ed into pla in or safet y
sockets. Switch must be in th e "Off" po s iti on w he n co nn ecting.
The gr i nders must not be used w ithout wh eel guards.
Do not exceed the dime ns ions · of grinding wheels stipulated .
For cutting off, use cutting wheels together with the prescribed
flanges and, in addition to this, our wheel guard with adjustable
support for cutting off stone.
4. Maintenance and lubrication.
The ang le grinder requires ad equate maintena nce. Before star -
ting any maintenance work pull plug from socket.
After 3-4 weeks the m achi ne, in particular ca r bon hold e rs and
insula te d par ts , should be cleaned of carbon dust a nd dirt. Th is
is done by m ea ns of a brush or compressed air.
Worn ca r bon brush es automatica ll y switch off the mach in e
utte r re ach ing their minimum le ngth . After checkin g the carbon
brushes make sure to refit them in their origina l position and

90
91
84
r- N' --
' ~ ·~ - r=: :
31
7 2a 73 74 105 5 72
72a 86
88
'--

Component Parts
0 I
z
Order
:::.
Description
....
0
....
Reference
""
0 I
z
Order
f
Description
....
....
Reference
a
""
'"" '""
1-17
MK 3-111-1 1) 1
motor housing assembled for
80-89 1
GH4-67-1
1 I handle assembled with switch
136-260 v 80
GH4-67
1 handle
1-17
MK3-111-2
1) 1
motor housing, assembled for
110-135 v
1
MK 3-111 1 motor housing
7 PT 27-30 2 cover
8
state type 1
pole housing, assembled with
and ten sion
winding
9 SR 1-M5x80 2 hexagon screw
10
PT 37-8 2
securing plate
11 EZ 12-47-2 2
carbon holder assembled
with wire
14
EZ 11-61 2
carbon brush
15
EZ 13-9 2
carbon holder cap
16 PT 27-29 2
motor housing cover
17 SR 6k-M3x6
4
fillister countersunk screw
20-26
state type 1 armature with winding, commutator
and tens.ion
and fan
FL 4-11-1 1
fan, assembled
30-62
GH 6-76 -1
1 I gear housing, assembled
30
GH 6-76 1
gear housing
33 LK 16-38 1
grooved ball bearing
34 PT 11-58 1
cover plate
35 DJ 1-50 1
felt ring
36
JS 28-8 1 I
air conductor
39 SR 2b-M4x15
3 cylindrical screw
40
RJ 27i-12x28,1 1
Nilos ring
41
RJ 24-29
washer for pinion (as needed)
81 EZ 1-61 1
switch
82 PT31-21
1 cable clamping bridge
83 SR3-M3,5x15 2 fillister head screw
84 EZ 22-36 1
capacitor
85
SR2-M3,5x10
2
cylindr ic al screw
86 DJ 1-52 1 felt ring
87
SA 5-47 1
sw itc h lever
88 SR3-M3x15
1
fillister head screw
89 DJ 5-41 1 sealing plate
90 JS 13-95 1 cable protecting sl eeve
91 EZ 7-106 1
cable
95-
GH 7-79-1 1
housing for MSf 679 b/136 ... 260 V
100
95-
GH7-79 -2 1 housing for MSf 679 b/ 11 0 ... 260 V
100
95
GH 7-79 1
housing
96 JS 26-9 1
rubber plate
97 EZ 51-102-1 1
overload protection switch for
MSf 679b/231 ... 260 V
97 EZ 51-103-1 1
over l oad protecti on switch for
MSf 679 b/191 .. . 230 V
97 EZ 51-104-1 1
overload protection switch for
MSf 679b/151 . . . 190 V
97 EZ 51-105-1 1
overload protectio n switch for
MSf 679 b/131 . .. 150 V
97 EZ
51 -106-1 1
overload protection switch for
MSf 679b / 111 . .. 130 V
42 BF 21-4x4x14 1
fitting key
43 2) ZR 13-100 1 b
eve l pinion
97 EZ 51-107-1 1
overload protection switch for
MSf 679b/110 V
44
PT 4-16 1
disc
45
MR 19-1 1
hexagon nut
46
PT 19-66 1
bearing plate
98 SR2-M2,6x15[ 1
cylindrical screw
99
MR2 -M2,6 1
hexagon nut
100
DJ 5-41 1
sealing plate
46a
PT 11-62 1
cover plate
102
MZ 20-26 1 bow handle
47
DJ 1-49 1
felt ring
103
SR 12-32 2 screw
48 RJ 27a-40x20,2 1
Nilos ring
49 LK 16-25 1
grooved ball bearing
50
PT 16-36 1
end cover
104
PT 5c-M14
I
2
disc
51 SR 5-M4x12
3 countersunk screw
52
wB ·6-47 1
driving shaft
53
BF 21-5x5x16 1
fitting key
Accessories
542) ZR 14-145 1
bevel gear
55
RJ 29a-16x0,6 1
circlip Seeger
M 10-153-1 1 w
heel guard
56 RJ 19 -4 1
sealing ri ng
EZ 11-61 2
spare carbon brushes
57 I LK 6-24 1
needle bearing
58
RJ 16-20 1
circlip Seeger
Z 7-SW 17 L 1
single end spanner
z10-10 1
hexagon socket wrench
59
RJ 24-89
washer for bearing plate
(as needed)
' z 13-22 1
peg spanner
60
DJ 12-6 1
ring
MZ60 -4 /FG9
1 tube of gear grease
61
DJ 11 -5x9 4
sealing r ing
MZ60 - 5/FK5
1
tube of ball bearing grease
62 SR 33-M5x20 4
cylindrica l screw
70 FD5-7
2 spring
71 LK 16-22 1 grooved ball bearing
110-I
M7 -114-1 1 I
fl a nge set co nsis ting of:
113
71a RJ 28-10x1,2 1
circlip Seeger
110 M 7-114 1
internal flange
72 SR 33-M5x30 4 socket head cap screw
111 M 8-111 1
outside flange
72a
PT 5d-M5
8
securing plate (for pos. 72 and 73) 112 M 8-52 1
threaded flange
73 SR33-M5x30
4
socket head cap screw
113
JS 16-51 2
rubber gasket
76 SR2-M4x5
1
cylindrical screw
MZ 38- 59
1 tool carry ing case
1)
When ordering, state type and tension.
2)
Parts 43 and 54 are lapped together and can be supplied in pairs only.

check that they move easily in their holder. After fitting new
brushes, run tool unloaded for about 15 minutes to allow
brushes to bed in. Please, only use original Fein carbon brushes
(order reference: EZ 11-61).
In order to prevent accidents, check cable at regular intervals.
To replace the cable, take off screw (88) and switch lever (87).
Unscrew the handle (80) off the motor housing (screws 72) and
draw it backwards. Loosen cable clamping bridge (82), clamp off
the cable from the switch (81) and draw it out.
Every 900 duty hours the machine should be thoroughly cleaned.
The gearing, working under high load, needs particularly good
lubrication. We recommend to renew the gear grease after
approx. 300 duty hours. Please, only use our special Fein gear
grease FG 9. A mixing of this grease with other greases endan-
gers the greasing capacities, and therefore also use FG 9 for the
anti-friction bearings in the gear head. In ord er to check and
renew the gear grease loosen the screws (62) and remove
bearing plate (46) with driving shaft (52). When removing the
bearing plate and in particular when re - assembling, please, don't
lose packing rings (59) and sealing ring (60) . The packing rings
are needed for adjustment of the gearing; their loss may lead to
damage.
For good and adequate lubrication and in order to avoid over-
heating it is important to pack the gearing with the grades and
quantities of grease listed in the table below.
Quantity
Contents
Type of
Order
I
Reference
approx.
grease
I
oz g oz g
For
gears
FG9
I 5 I 140 I
MZ 60-4/FG 9 I 6 I 180
i
' For
ball bearings
FK5 MZ 60-5/FK 5 '/6 5
for ball
approx.
1
13
bearing
part 71
of the
FG9
space be-
MZ 60-3/FK 9
tween inner 3 90
for roller
and outer
bearings ring
parts 33 , I
49, 57
Larger quantities of grease are packed in tins .
No claims can be entertained for damage due to negligent main-
tenance and inadequate lubrication .
After 900 duty hours rinse ball bearings in clean solvent and
pack with fresh grease as per table below. The space between
inner and outer ring is to be one third filled with grease in
order to prevent overheating of the bearings.
5. Dismantling
The tool should only be taken apart by an expert working in
the following sequence:
1. Remove grinding wheel and wheel guard.
2. Remove motor housing cover (16), unscrew carbon holder
caps (15) and take out carbon brushes (14).
3. Remove screws (62) and draw off bearing plate (46) with
driving shaft (52) and bevel gear wheel (54). Don't lose
packing rings (59) with sealing (60)!
4. Loosen screws (73) and draw gear housing (30) with armature
(20) out of motor housing (1).
5. Unscrew hexagon nut (45) off armature shaft (20) and take
out washer (44), bevel pinion (43), fitting key (42), washer
(41) and Nilos ring (40) . Then draw armature shaft (20) out of
gear housing (30).
6. Loosen screws (39) and take air conductor (36), felt ring (35),
cover plate (34) and ball bearing (33) out of gear housing (30).
7. Remove needle bearing ring with sealing ring (56) from driv-
ing shaft (52).
Remove circlip Seeger (55), bevel gear wheel (54) and fitting
key (53). Unscrew screws (51), remove flange (50) and draw
driving shaft (52) with ball bearing (49) out of bearing plate
(46).
8. Loosen screw (88) and remove switch lever (87). Remove
screws (72) and push handle (80) backwards. Clamp off cable
and capacitor (84) from motor housing (1) and remove switch
(81) .
Re-assemble in reverse sequence. When refitting pm10n and
bearing plate, please, bear in mind that washers (41, 59) are to
be placed in their right places as they are needed for accurate
adjustment of the gearing. When fitting bearing plate check that
bevel gear wheels mesh accurately . For this purpose turn
driving shaft (52) slightly; only then fasten screws (62).
6. Repair and Spare Parts
We recommend our FEIN Service Stations to carry out all over-
haul and repair work quickly and expertly.
We deliver special tools to carry out repairs . The base tube
ZSO 8-8 and the two-part base plate ZSO 9-57 are used to take
off the bevel gear (54).
The tube ZSO 8-1, the base ZSO 28-2, the support ZSO 34-3 and
the dismantling device ZSO 28-5-1 will be used to take off the
pole housing.
The spanner ZSO 77-7-1 is used for disassembling the carbon
holders and the spanner ZSO 71 -6 for assembling.
When ordering spare parts, please, quote Type and Serial No.
of the machine as well as Order Reference of the required part
or
send in the damaged part.
We draw your attention to the need to carry out a high voltage
test in accordance with your local regulations (or VDE regula-
tion 0740) before taking a tool into service after any repair
carried out by your own staff.
(