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T ECHNICAL INFORMATION
Models No. KP312, KP312S
PRODUCT
P1/9

Description Planers 312mm (12-9/32")

CONCEPTIONPlaners have been developed as sister tools
These new Power
AND MAIN APPLICATIONS H

to the existing Makita models KP301 or KP311, excelling
predecessors both in power and convenience.
Model KPS312S features soft start circuit
and overload protector. W
L
Supply of Model KP312 is restricted to low voltage
(110V - 120V) area. Dimensions : mm ( " )
Length ( L ) 551 (21-3/4)
Width ( W ) 425 (16-3/4)
Height ( H )
Specification 219 (8-5/8)

KP312
Continuous Rating (W)
Voltage (V) Current (A) Cycle (Hz) Max. Output(W)
Input Output
120 15 50 / 60 1,700 690 2,450

KP312S
Continuous Rating (W)
Voltage (V) Current (A) Cycle (Hz) Max. Output(W)
Input Output
230 10 50 / 60 2,200 820 3,000
220 11 50 / 60 2,200 1,040 3,850

Model No. KP312 KP312S
No load speed (min -1= rpm) 12,000
Planer Blade (mm [in]) 312 [12-1/4]
Soft Start No Yes
Overload Protector No Yes
Protection from Electric Shock Double Insulation
Cord Length : m ( ft ) 10 [32.8]
Net Weight :Kg (lbs ) 18 [39.7]
Capacity
Planing width : mm [in] Planing depth : mm [in]
0 - 150 [0 - 5-7/8] 3.5 [1/8]
150 - 240 [5-7/8 - 9-1/2] 2.0 [1/16]
240 - 312 [9-1/2 - 12-9/32] 1.5 [1/16]

Standard equipment
For Model KP312 For Model KP312S
* Socket wrench 9 ................ 1 pc. * Hex wrench ........................ 1 pc.
* Triangular rule .................... 1 pc. * Nozzle assembly ............... 1 pc.
* Triangular rule .................... 1 pc.
* Joint 70 .............................. 1 pc.
< Note > The standard equipment for the tool shown may differ from country to country.

Optional accessories
* Nozzle set
* Joint assembly
* Planer blade 312mm
Features and benefits P2/9
KP312, PK312S

Free from Uneven Planing Increased Efficiency More Powerful Planing
Uneven planing can be avoided by shifting in Chip Ejection Even hard wood can be easily planed.
the tool's center of gravity to its center. Engineered in order not to be
clogged even with wood chips
Overload Protector of wet workpiece.
10m Power Supply Cord
(Model KP312S only) Best length for planing jobs

New Location for
Roller Power Supply Cord
Allows the tool to move smoothly Ideally located for preventing
in repeated planing. cord from being caught and
rolled by the drum of the tool
when the tool is taken back
Soft Start Feature for another stroke.
(Model KP312S only)
Prevents breakers from working
Foot
unnecessarily in order not to interrupt Installed on the rear of the tool
operation; generally. breakers for blades not to hit against
at job sites have a small capacity. workpiece or floor.
Plate Type Guide Rule




Foot
Comparison of products
High Voltage Low Voltage
Competitor Competitor Competitor
Model No. MAKITA A B MAKITA B
Specifications KP312S KP301 A B KP312 KP311 B
Power input : W 2,200 2,100 2,700 2,100 1,700 1,460 1,450
Rated amperage with 120V 15A
No load
12,000 10,300 8,000 13,000 12,000 14,000 13,000
speed : min -1= rpm
Max. planing depth : mm 3.5 3.5 3.0 2.5 3.5 2.0 2.0
[in] [ 1/8 ] [ 1/8 ] [ 1/8 ] [ 3/32 ] [ 1/8 ] [ 1/16 ] [ 1/16 ]
Planing width : mm 312 300 320 318 312 312 312
[in] [12-1/4] [11-3/4] [12-5/8] [12-1/2] [12-1/4] [12-1/4] [12-1/4]
Soft start feature Yes No Yes No No No No
Overload protector Yes Yes No No No No No
Double insulation Yes Yes Yes No Yes No No
Cord length : m ( ft ) 10 (32.8) 10 (32.8) 10 (32.8) 10 (32.8) 10 (32.8) 8 (26.2) 8 (26.2)
Length ( L ) : mm 551 510 558 528 551 590 528
Dimensions




[in] (21-3/4) (20) (22) (20-3/4) (21-3/4) (23-1/4) (20-3/4)
Width ( W ) : mm 425 370 468 376 425 375 376
[in] (16-3/4) (14-1/2) (18-1/2) (14-3/4) (16-3/4) (14-3/4) (14-3/4)
Height ( H ) : mm 219 270 182 194 219 200 194
[in] (8-5/8) (10-5/8) (7-1/8) (7-5/8) (8-5/8) (7-7/8) (7-5/8)
18 15.8 16 15 18 18 15
Net Catalog (39.7) (34.8) (35.3) (33.1) (39.7) (39.7) (33.1)
weight : Kg
(lbs) 18.2 17.4 14.2 14.7 18.2 18.6 14.7
Measured
(40.1) (38.4) (31.3) (32.4) (40.1) (41.0) (32.4)
Repair P3/9
< 1 > Lubrication
Apply MAKITA grease N. No.1 to the following portions marked with black triangle to protect
parts and product from unusual abrasion.
(67) Armature
(69) (68)



(46) Spindle
complete

(74)


(86)
hex socket head
bolt M10x40


Item No. Descriptions Portions to be lubricated Amount to be applied
46 Coupling Inner hole (spline portion) which accepts
armature shaft and spindle
67 Flat washer 8 Whole portion
68 Flat washer 8 The portion where knob (69) contacts.
69 Knob The portion where flat washer 8 (68) contacts.
74 Front base The portion where main base contacts. Approx. 4g (0.14 oz)
86 Leaf spring The portion where front base contacts. Approx. 1g (0.04 oz)


< 2 > Removing poly V belt
( 1 ) Remove belt cover by unscrewing one pc. of pan head screw M5x65.
( 2 ) Lifting up poly V belt with screwdriver, turn V pulley with your hand.
Then, V pulley can be removed as illustrated in Fig. 1.

Poly V belt




Belt cover Pan head screw
M5x65


Fig. 1
Repair P4/9
< 3 > Removing V- Pulleys
(1) Attach the following bit to the impact driver. D=5mm 110mm
* 1R230 Multi-purpose M6 for hex socket head bolt M6x12
* Socket bit 17 for hex nut M10x17. D 13mm
And remove hex nut M10x17 and hex socket head bolt M6x12
with the impact driver. 1R230 Multi-purpose M6




< Note in Removing >
* Turn hex nut M10x17 clockwise for loosening.
* Adhesive has been applied on hex socket head
bolt M6x12.

Hex nut M10x17


Hex socket head
bolt M6x12 Fig. 2

(2) Remove V-pulley 9-39.7. And by turning clockwise, remove V-pulley 9-23L. See Fig. 3.


< Note in Removing >
* Pay attention, not to lose key which is mounted to
drum shaft.



V-pulley
9-23L
Turn clockwise for
Key 4 loosening.

V-pulley 9-39.7

Fig. 3

< 4 > Mounting V-pulleys and poly V-belt
(1) Mount V-pulley 9-23L to the threaded portion of spindle by turning anti-clockwise with your hand.
But be careful, not to tight it too strong. And then, fix the V-pulley 9-23L with hex nut M10x17.
The hex nut M10x17 has to be turned anti-clockwise for fastening. But fasten the hex nut not strong
in this stage. See Fig. 4.

(2) After inserting key 4 to the grove of drum shaft, mount V-pulley 9-39.7 to the drum shaft aligning its cut portion
to the key 4. And then, fix the V-pulley 9-39.7 with hex socket head bolt M6x12.
The hex socket head bolt M6x12 has to be turned clockwise for fastening. But fasten the hex socket head bolt
not strong in this stage. See Fig. 4.

If you use the used hex socket head bolt M6x12,
apply the adhesive to the threaded portion of the bolt,
or use the fresh one.
V-pulley 9-23L




Hex nut M10x17
Key 4


V-pulley 9-39.7 Hex socket head
bolt M6x12
Fig. 4
Repair P5/9
(2) Mount poly V-belt. See Fig. 5.
(3) Fasten hex socket head bolt M6x12 and hex nut M10-17 firmly until both V-pulleys turn as illustrated in Fig. 6.




Wrench 17
Turn the wrench
anti-clockwise
for fastening.


Poly V-belt



Hex wrench
Turn the hex wrench clockwise
Fig. 5 Fig. 6 for fastening.


< 5 > Removing ball bearing 6002DDW and ball bearing 6202LLB on drum
(1) To protect the screw hole for hex socket head bolt M6x12, insert a screw of size M6 as illustrated in Fig. 7.
(2) Remove ball bearing 6202LLB with No.1R269 "Bearing extractor". See Fig. 8.
(3) Remove ball bearing 6002DDW with No.1R269 "Bearing extractor". See Fig. 8.

Ball bearing 6002DDW
1R269 "Bearing extractor"
Ball bearing 6002DDW
Drum
Drum
Ball bearing 6202LLB 1R269 "Bearing extractor"
Screw of size M6

Ball bearing 6202LLB
Fig. 7 Fig. 8

< 6 > Mounting armature
(1) Make sure that O ring 14 has been mounted to armature. If not, mount it. And then, mount coupling with
aligning its spline with the armature's spline. See Fig. 9.




Armature Armature equipped with O ring 14
O ring 14 carved Spline
Coupling



Fig. 9
Repair P6/9
(2) Mount the armature to motor bracket. When mounting armature to motor bracket, align the coupling's spline with
the spline of spindle, by slowly turning V-pulley 9-23L.

Coupling
Motor bracket



Slowly turn V-pulley 9-23L to
align the spline of spindle with
the couplings spline.




Fig. 10

(3) Make sure that baffle plate has been assembled to motor housing. And mount motor housing to motor bracket
with lifting up the armature body as illustrated in Fig. 11.

Motor housing
Lift up the armature body to avoid that the armature body
contacts field in motor housing.




Baffle plate




Fig. 11
8 pcs. of
< 7 > Mounting handle R and L to main base. Pan head screw M5x28 Main base
Joining handle R and L closely, fix them
ton main base with 8 pcs. of pan head screws M5x28.
See Fig. 12.

Handle R




Handle L




Fig. 12
Repair P7/9
< 8 > Replacement of the electrical parts in handle
( 1 ) Remove the following screws. ( 2 ) Removed handle R. The electrical parts can be replaced.
1. Pan head screw M5x28 : 4 pcs. See Fig.13.
2. Pan head screw M4x28 : 2 pcs.
3. Pan head screw M4x60 : 2 pcs.
See Fig. 13. 1
Noise suppressor
2 Switch
3 1
Soft start circuit
2


Handle L

Handle R
Over current relay




Fig. 13


< 9 > Mounting and adjustment of knob
Before mounting knob to front base, adjust it with hex lock nut M8-13, so that the knob can be turned smoothly, but
without wobbling. See Fig. 14.
Knob
Flat washer 8 (large) Main base
Hex lock
Flat washer 8 (small) nut M8-13
Hex nut M8


Hex lock nut M8-13




Front base

Fig. 14

< 10 > Mounting bracket cove and main bracket
Main bracket has to be closely mounted to bracket cover. And both of them has to be mounted to main base firmly
and closely. See Fig. 15.



Main base




Main bracket

Bracket cover


Fig. 15
Circuit diagram Color index of lead wires
P8/9
Black
KP312 White
without soft start feature Orange Black or brown
and over current relay White or blue




4 5



2 3




Wiring diagram

KP312
without soft start feature
and over current relay
Pass the following lead wires
back side of switch (opposite Hold Support unit's lead wires (black and orange)
side of switch trigger.) with lead holders as illustrated.
* Power supply cord (black or brown)
* Support unit's lead wires To avoid pinching, do not
(black and orange) pup any lead wires in this
area.




Pass the power supply
cord (white or blue) through
the illustrated position.
Circuit diagram Color index of lead wires
P9/9
Black
KP312S White
with soft start feature Orange Black or brown
and over current relay White or blue




4 5
Over current
relay

2 3




Soft start Noise
circuit suppressor
Connect noise suppressor
as per the circuit diagram,
Wiring diagram if any.
KP312S
with soft start feature
and over current relay
Hold the following lead wires
Pass the following lead wires with lead holder as illustrated.
back side of switch (opposite * Support unit's lead wire (orange )
side of switch trigger.) * Lead wire of soft start circuit
* Power supply cord (black or brown)
* Support unit's lead wires (orange) Hold the following lead wires
* Lead wire of soft start circuit with lead holders as illustrated.
* Support unit's lead wire (black )
* Lead wire of soft start circuit
To avoid pinching, do not
pup any lead wires in this
area.




Hold support unit's lead wires (black and orange)
with lead holder as illustrated.




Hold the following lead wires Hold the lead wires of soft start circuit
with this lead holder. with this lead holder.
* Lead wire of soft start circuit
* Noise suppressor's lead wire
But lead wire of soft start circuit
has to be put on the noise
suppressor's lead wire.