Maktec MT924 Manual

Model No.
Description
PRODUCT
CONCEPT AND MAIN APPLICATIONS
P1/ 4
Specification
Standard equipment
Optional accessories
Continuous Rating (W)
Voltage (V) Cycle (Hz) Input Output Max. Output (W)
110
120
220 - 240
2.3
2.1
1.1
50/60
50/60
50/60
240
---
240
65
65
65
150
150
150
Current (A)
Note: The standard equipment for the tool shown above may vary by country.
MT924
125mm (5") Random Orbit Sander
Dimensions: mm (")
Width (W)
Height (H)
Length (L) 153 (6)
123 (4-7/8)
144 (5-5/8)
Model MT924 has been developed as the aesthetic design change
model of a maktec 125mm random orbit sander Model MT922.
Its main features are:
• Built-in dust extraction system to comply with the regulations
of the EC directives
• Industrial performance and durability at less expense
Abrasive papers
Abrasive paper 125-120 (Hook & Loop) .......... 1
Dust bag assembly ............................................. 1
Pad size: mm (") ø123 (4-7/8)
ø2.8 (1/8)
Protection from electric shock Double insulation
Weight according to
EPTA-Procedure 01/2003: kg (lbs)
Power supply cord: m (ft)
Abrasive paper size: mm (") ø125 (5)
MT924
Orbits per minute: opm= min-1
Paper fastening system Hook & Loop
Sanding strokes: spm= min-1
Specification Model
Built-in dust extraction system
Orbit diameter: mm (")
Yes
Sanding pad brake Yes
2.0 (6.6)
1.2 (2.6)
12,000
24,000
L
W
H
TECHNICAL INFORMATION

P2/ 4
[2] Disassembly/ Assembly
[2]-1. Switch, Power supply cord and Carbon brush
[2]-2. Pad 123, Ball bearing 6202DDW and Armature Ass’y
[1] NECESSARY REPAIR TOOLS
Repair
DescriptionCode No.
DISASSEMBLING
ASSEMBLING
(1) Switch and Power supply cord are accessible by just removing
Top cover and 4x18 Pan head screws (3pcs.).
(2) Remove Brush holders with Carbon brushes as follows:
Pull out flag terminals of lead wires from tabs of Brush holder.
Hold the tab with long nose pliers, then push one of Carbon brush
toward Commutator side and lift up Brush holder vertically. (Fig. 1)
Remove the other Brush holder and Carbon brush in the same manner.
Note: Do not bend tabs of Brush holders.
Do not scratch commutator.
(1) Remove M4x18 Pan head screws (3pcs.) then separate Pad 123, Bearing box cover and Brake ring. (Fig. 2)
(2) Hold Fan 88 by inserting slotted screwdriver from a vent of Skirt, then remove M4x14 Pan head screw with Flat
washer 4 from shaft of Armature ass’y.
Flat washer 15, Bearing box and Ball bearing 6202DDW can be removed. (Fig. 3)
(3) Separate Skirt set (L) and (R) by removing M4x20 Pan head screws (2pcs.), then pull out Fan 88. (Fig. 4)
(4) Remove 4x18 Tapping screws (4pcs.) then pull out Armature ass’y with Bracket from Motor housing set. (Fig. 5)
Bearing box
Take the disassembling step in reverse.
1R269 Bearing extractor Removing Ball bearing
Use for
Tab of
Brush
holder
Commutator
Fig. 1
Fig. 2 Fig. 3
Fig. 4 Fig. 5
Carbon brush
M4x18 Pan
head screws (3pcs.)
Pad 123
M4x14 Pan head screw
Flat washer 4
Flat washer 15
Skirt set
Fan 88
M4x20 Pan head screws (2pcs.)
Bearing box cover
Brake ring
Vent of Skirt
Insert slotted screwdriver
so as not to revolve Fan 88
Ball bearing 6202DDW
4x18 Tapping screws (4pcs.)
Bracket
Motor housing set
Armature ass’y
4x18 Pan head screws (3pcs.)
CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”.

P3/ 4
[2]-2. Pad 123, Ball bearing 6202DDW and Armature Ass’y (cont.)
Repair
DISASSEMBLING
ASSEMBLING
(5) Remove Bracket with arbor press. (Fig. 6)
(6) Remove Ball bearings from Armature ass’y using 1R269 and Water pump pliers. (Figs. 7 and 8.)
Note: There is little space between Ball bearing 606ZZ and Insulation washer / Ball bearing 629DDW and Washer 9.
Therefore, hold the jaws of 1R269 with water pump pliers to retain Ball bearing securely.
Temporarily tighten M4x14 Pan head screw to Armature shaft to protect the female thread when removing Ball
bearing 629DDW. (Fig. 8)
Fig. 6
Fig. 8
Fig. 7
Insulation washer
water pump pliers
arbor press
Bracket
Armature ass’y
1R269
Ball bearing 606ZZ
water pump pliers
1R269
Ball bearing 629DDW
M4x14 Pan head screw
Washer 9
Take the disassembling step in reverse.
Note: When fixing Washer 9 to Armature shaft, face the convex portion to outside as drawn in Fig. 9.
Fit Brake ring into Skirt set as drawn in Fig. 10.
Fig. 9 Fig. 10
convex portion
of Washer 9
1) Face the rim portion to the machine side.
2) Fit the protrusions on the rim portion of
brake ring into the notches of Skirt set.
3) Insert the rim portion of Brake ring into
the groove on Skirt set.
rim portion of Brake ring
protrusions on
the rim portion
of Brake ring
notches of
Skirt set
groove on Skirt set

P4/ 4
Circuit diagram
Wiring diagram
Fig. D-2
Fig. D-1
Put the slack portions of Lead wires
in the space here.
Put the slack portion of Lead wires
in the space here.
Brush
holder
Fix Lead wires of Noise suppressor
in these Lead wire holders.
Brush holder
Noise suppressor
(Insert it between ribs around here.)
The noise suppressor is not used
for some countries.
Noise suppressor (if used)
Fix lead wires (white) for Switch
with these Lead wire holders.
Brown lead wire
is used for
some countries
Blue lead wire is used for some coutries.
Switch
Field
Terminal block
Terminal block
(Insert it between
ribs around here.)
Route one of Lead wire
of Power supply cord
through this groove and
connect the lead wire
with Switch terminal.
Fix lead wires (black)
to Brush holders in
these Lead wire holders.
Switch
Black
White
Color index of lead wires' sheath