Makita UM401D Manual

Mulching
(Scattering cut lawn to turf)
With rear bag
Without mulching plate Collecting cut lawn
Model UM4OlDW is with Charger DC240.
Motor DC 24V magnet motor
Battery 24V lead battery (15Ah)
No Load Speed 3800rpm
Effective cutting width 406mm(16")
Effective cutting height 25mm(1")-89mm(3-1/2") ------ 6 heights
Net Weight 31.9kg (70.3 lbs)
Socket Wrench 13 ------------------------- 1 pc.
Wrench 32 ---------------------------------- 1 pc.
Key(for interlocking safety switch) ----- l pc.
Mulching Plate ------------------------------1 pc.
Swing Saw Blade 406
The standard equipment for the tools shown may differ form country to country.
CONCEPT AND MAIN APPLICATIONS
Specifications
Standard equipment
Optional accessories
Models No.
Description
New Tool
TECHNICAL INFORMATION
UM401D
400mm Cordless Lawn Mower
Without rear bag
With mulching plate
*Chaging time
3Hr :.75% charge
4Hr : Full charge
Model UM401DW is cordless lawn mower powered with 24V
lead battery.
Its effective cutting width by rotary blade is 406mm(16"). Its
brief benefits are;
 *No pollution owing to no exhaust gas and less noise
 *Can mow approx.75 min.. continuously(approx.
l200m )
 from a single charge.
1316mm(51.3/4")
1010mm(39.3/4")
482mm(19")
Switch lever is comfortable
to grip for long operation.
with lock-off button
with lock-off button
Folding handle
Rear bag (Cut lawn is collected.)
Cutting height can
be adjusted
by the sigle lever.
6 different heights:
25mm(1")-
89mm(3-1/2")
Charge meter
shows how much
charge is left
Interlocking key for safety switch
Without key in position tool does
not start unintendedly.
Cutting capacity
1200m from a single charge
Charging time
4Hr Competitors' tools'charging time are 16-24Hr.
Mulching(scattering cut lawn to turf)
can be performed without rear bag but with mulching plate
2

*Cautions in repairing
Torque set for the tool when fastening the screws
(1) Tapping screw flange PT 4x18 => 8-12 kgf-cm (0.6 - 0.9 ft-lbs)
Note that the following is excluded.
 i) For the cord lamp of deck and switch box => 10-12 kgf-cm (0.7- 0.9 ft-lbs)
 ii)Fortheplateoffront/rearshafts => 12-16kgf-cm(0.9-1.2ft-lbs)
(2) Tapping screw flange PT 4x25 => 8-12 kgf-cm (0.6 -0.9 ft-lbs)
(3)TappingscrewflangePT5x25 => 18-22kgf-cm(1.3-1.6ft-lbs)
(For battery holder complete)
(4)TappingscrewflangePT5X25 => 10-14kgf-cm(0.7-1.0ft-lbs)
(For control panel)
1.Disassembling of blade
To disassemble the motor assembly, remove the blade beforehand. See the instruction manuals for disassembling
methods.
2.How to remove the cowling Remove the rear bag, and then loosen the
tapping screw PT4x25(2 pieces) and
PT4x18(2 pieces) for mounting the curling
to disconnect the curling.
3.Replacing of the battery Loosen the +Hexagon bolt M5x12(2
pieces) to remove the lead wire from the
battery.
Loosen the tapping screw flange
PT5x25(2 pieces).
Caution (1) : Be sure to turn off the interlock switch and take away the key before repairing for safety.
Caution (2) : This machine consists of the battery. If the curling has been removed, the battery and lead wire will be
 exposed. Use care not to get a short circuit. Especially take care that the metal ruler and driver etc. in
 the breast pocket may not drop on the machine when you have bent forward.
Caution (3) Many strong impact proof resins(polypropylene) are used for this machine. Since fastening the tapping
 screws by the excessive torque may damage the female screws, be sure to apply the tool fastening
 torque as specified. Do not fasten manually or never use the tool that cannot set the torque as
 specified.
Repair
PT 4X25 Tapping screw flange PT4x25
PT 4X18 Tapping screw flange PT4x18
PT5X25 Tapping screw flange PT5x25
Lead wire Temperature fuse complete
M5 Hexagon nut M5
Battery holder complete
PT5X25 Tapping screw flange PT5x25
+Hexagon bolt M5x12

Slide the battery holder complete until
the sponge sheet B touches with the
temperature fuse complete.
Slide the battery holder complete upward to take away it.
Remove the battery from deck and then replace it.
<Cautions in assembling>
Be sure to place the temperature fuse complete between
batteries.
4.How to remove the motor assembly
<Cautions in assembling>
Fasten the hexagon bolt M6x40 under
the tool setting torque of 40-60 kgf-
cm[2.9-4.3 ft-lbs] when assembling.
Engage the box wrench 10 with both
hexagon lock nut M6-10 and hexagon
bolt M6x40, and then disassemble the
hexagon bolt M6x40 and the fix plate.
Sponge sheet B
Slide away Remove.
Hexagon lock nut M6-10(4 pieces)
Motor assembly
Fix plate(2 pieces)
Hexagon bolt M6x40(4 pieces)

5.Disassembling of motor assembly Loosen the hexagon holed stop screw M8 x 8
(Adhesive attached) to remove the blade holder
from the armature.
Loosen the hexagon bolt M5x115(2 pieces) to
disassemble the motor assembly.
<Cautions in assembling>
Fasten the hexagon bolt M5x115 under the tool setting torque of 20-30 kgf-cm[1.4-2.2 ft-lbs] when
assembling. Make fit of each dent and protruded portions on the end bell, yolk unit, plate and bearing box,
respectively.
6.How to remove the connecting rod, front shaft and rear shaft
Remove the wheel cap and then loosen the bolt with step 3/8-16 UNC to disconnect the 7" wheel and 8" wheel.
Loosen the tapping screw flange PT4x12(1 piece) to remove the flat washer 4. Remove the tension spring 12
from the boss on the deck. Remove the circle clip(shaft)S-8 from the front and rear shafts. Remove the
connecting rod.
Loosen the tapping screw flange PT4x18(8 pieces) on the back of the deck to remove the plates(4 pieces)
Tension spring 12
End bell
Small protrusion
Ball bearing 6000LLB
Armature
Yolk unit
Small dent portion
Large dent portion
Protrusions at 4 corners
Large protrusion
Plate Hexagon holed stop screw M8x8(adhesive adhered)
Blade holder(Dust cover mounted)
Hexagon bolt M5x115(2 pieces)
Bearing box
Ball bearing 6203LLB
Flat washer 17
Flat washer 4(one piece)
Tapping screw flange PT4x18(one piece)
Boss
Circle clip(shaft)S-8
Rear shaft
8" wheel
Cap
Bolt with step 3/8-16 UNC
Deck
Connecting rod
Circle clip(shaft)S-8
7" wheel
Cap
Bolt with step 3/8-16 UNC
Front shaft
Tapping screw flange PT4x18(8 pieces)
Plate(4 pieces)
Deck Remove the
tension spring 12.
Remove the
tension spring 12.
Square
hole

Remove the front shaft and rear shaft from the deck.
<Cautions in assembling>
Assemble the shorter side of the
connecting rod on the front shaft.
7.Disassembling of the control panel
<Cautions in assembling>
For the tension spring 12, first assemble the connecting rod side
and then insert the hook at back side into the root of boss on the deck.
Loosen the tapping screw flange PT4x12(2 pieces) to remove the claws at 6 points, and then disassemble the
control panel and control panel holder.
To disassemble the inlet, cut off the lead wire.
Assemble the switch while the switch lever is being turned off.
Use care of directions for up/down when assembling the indicator.
Assemble the O.C.R. while the face with 5 caulking faced up.
How to assemble the inlet cover
Set the torsion spring 4 on the inlet
cover as shown on the figure and
then insert the longer arm of the
torsion spring 4 through the hole of
control panel.
Front shaft side
Short
Boss
Connecting rod
Insert into the root. Boss
Control panel
Claw(6 pieces)
Switch plate
Inlet
Control panel holder
Tapping screw flange PT4x12(2 pieces)
Switch
Indicator
O.C.R.
Caulking(5 points)
Hexagon nut M12
Cap
Inlet cover
Torsion spring 4
Hole
Control panel(main side)

Insert the spring pin 3-28 in the direction
shown on the figure and then mount the inlet
cover.
8.Disassembling of the switch box
Caution : Use care not to miss the compression spring 16 as it may potentially jump out.
Slightly bend the switch lever and then remove the switch lever from the handle.
Loosen the tapping screw flange PT4x18(4 pieces), and remove the switch box and switch box cover from the
handle.
Disconnect the E ring 12 to remove the
15, lever and switch
lever arm etc.
Spring pin 3-28
witch box
Switch box cover
Switch lever arm Switch lever
Remove
with bending.
Tapping screw flange PT4x18 Handle
Sinwasher E ring 12 Lever

<Cautions in assembling>
Set the torsion spring 20 on the lever as shown on the figure.
Insert the U-shaped hook of the
tension spring 5 through the hole of
lever. Also set the circle-shaped hook
on the boss of the switch box.
Mount the lever on the switch lever
arm which has been pre-mounted on
the switch box.
Set the thin washer 15 and E ring
12 to fix.
Insert the boss(2 pieces) of the switch box equipped with the lever and switch button through the hole on the
handle to assemble.
Set the compression spring 16 on the cross boss of the switch box cover, and then mount the switch box cover on
the switch box.
Torsion spring 20
Lever
Switch box
Boss
Tension spring 5
Switch lever arm Lever
Compression spring 16Cross boss
Switch box cover
Handle
Switch button
Insert the boss through the hole on the handle.
Switch box
Lever
Cover the switch
box cover.

Circuit drawing
Black
Switch
BlackRedWhite
Cord unit
Relay
White
Current relay Indicator Inlet Switch
Red
Red
Temperature fuse complete
Red
Red
Receptacle sleeve
Black RedRed
White
White
Red
Motor
Black
Connector at closed end
Insulation cover
Black
Battery Battery
Black