Maintenance - Makita 6934fd Instruction Manual
Cordless impact wrench
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Also See for 6934fd:
- Instruction manual (49 pages) ,
- Instruction manual (13 pages) ,
- Instruction manual (29 pages)
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Standard bolt
M16
140
.
N m
.
(1428)
(kgf cm)
120
(1224)
M16
100
(1020)
M14
80
(816)
M12
M14
60
(612)
M10
M12
40
(408)
M10
20
(204)
0
1.0
2.0
3.0
(S)
Fastening time
004373
High tensile bolt
.
N m
.
(kgf cm)
140
(1428)
M12
120
(1224)
M12
100
(1020)
M10
80
(816)
60
M10
(612)
M8
40
(408)
M8
20
(204)
0
1.0 2.0
3.0 4.0 5.0 (S)
Fastening time
004374
Hold the tool firmly and place the socket over the bolt or
nut. Turn the tool on and fasten for the proper fastening
time.
NOTE:
When fastening screw M8 (5/16") or smaller,
•
carefully adjust pressure on the switch trigger so
that the screw is not damaged.
Hold the tool pointed straight at the bolt or nut.
•
Excessive fastening torque may damage the
•
bolt/nut or socket. Before starting your job, always
perform a test operation to determine the proper
fastening time for your bolt or nut. Especially for
the bolt smaller than M8 (5/16"), perform the above
test operation to prevent the trouble on socket or
bolt, etc.
If the tool is operated continuously until the battery
•
cartridge has discharged, allow the tool to rest for
15 minutes before proceeding with a fresh battery.
The fastening torque is affected by a wide variety of
factors including the following. After fastening, always
check the torque with a torque wrench.
1.
When the battery cartridge is discharged almost
completely, voltage will drop and the fastening
torque will be reduced.
2.
Socket
Failure to use the correct size socket will
•
cause a reduction in the fastening torque.
A worn socket ( wear on the hex end or square
•
end ) will cause a reduction in the fastening
torque.
3.
Bolt
Even though the torque coefficient and the
•
class of bolt are the same, the proper
fastening torque will differ according to the
diameter of bolt.
Even though the diameters of bolts are the
•
same, the proper fastening torque will differ
according to the torque coefficient, the class of
bolt and the bolt length.
4.
The use of the universal joint or the extension bar
somewhat reduces the fastening force of the
impact wrench. Compensate by fastening for a
longer period of time.
5.
The manner of holding the tool or the material of
driving position to be fastened will affect the
torque.
6.
Operating the tool at low speed will cause a
reduction in the fastening torque.
MAINTENANCE
CAUTION:
Always be sure that the tool is switched off and the
•
battery cartridge is removed before attempting to
perform inspection or maintenance.
Replacing carbon brushes
Fig.7
Remove and check the carbon brushes regularly.
Replace when they wear down to the limit mark. Keep
the carbon brushes clean and free to slip in the holders.
Both carbon brushes should be replaced at the same
time. Use only identical carbon brushes.
Use a screwdriver to remove the brush holder caps.
Take out the worn carbon brushes, insert the new ones
and secure the brush holder caps.
Fig.8
After replacing brushes, insert the battery cartridge into
the tool and break in brushes by running tool with no
load for about 1 minute. Then check the tool while
running and electric brake operation when releasing the
switch trigger. If electric brake is not working well, ask
your local Makita service center for repair.
To maintain product SAFETY and RELIABILITY, repairs,
any other maintenance or adjustment should be
Page 6
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