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LIST No.
P 20SF: 0675
Oct. 2012
PRODUCT NAME
Hitachi 82 mm (3-1/4”) Planer
Model P 20SF
International Sales Division
REPAIR GUIDE
---------------------------------------------------------------------------------------------------------------- 1
1. Precautions on disassembly and reassembly ----------------------------------------------------------- 1
STANDARD REPAIR TIME (UNIT) SCHEDULES -------------------------------------------------------------------- 6
CONTENTS
Page
P
-1-
Before disassembling and reassembling the planer or replacing and sharpening the planer cutter, be sure
to disconnect the plug from the power supply. When disassembling and reassembling the planer, or even
in any other case, be sure to carefully handle the planer in order to prevent the bottom face of the base
from not being flat or parallel. Refer to the instruction manual for how to replace and adjust the planer
cutter.
1. Precautions on disassembly and reassembly
[Bold] numbers in the descriptions below correspond to numbers in the Parts List and exploded assembly
diagram for the Model P 20SF.
CAUTION: When disassembling the planer, be sure to first remove the planer cutter in order to
protect the tip of the cutter against damage and prevent the user from being injured.
1. Disassembly of the armature, cutter block ass’y and end bracket
Remove the Machine Screw (Black) M4 x 16 [49] and Tip Cover [31]. Then remove the Brush Cap [37]
and Carbon Brush [36]. Next, remove the two Tapping Screws (W/Flange) D4 x 12 (Black) [30] and
Bearing Cover [29]. Remove the two Machine Screws (Black) M4 x 16 [49] and Belt Cover [39], and then
remove the Belt [40]. Remove the four Tapping Screws (W/Flange) D4 x 20 (Black) [32] that secure the
End Bracket [42] to the Housing Ass’y [59], and then use a wooden hammer to strike the shaft of the
Armature [45] and the end face of the spindle of the Cutter Block Ass’y [1][18], while using the shaft of a
box spanner wrench to pull out the Armature [45] and Cutter Block Ass’y [1][18], together with the End
Bracket [42].
Disassembly
REPAIR GUIDE
-2-
2. Disassembly of the stator ass’y
• After removal of the Armature [45], remove the two Tapping Screws (W/Flange) D4 x 20 (Black) [32], and
then remove the Grip Cover [51]and Handle Cover [52]. Next, cut the connector (of the internal wire
from the Cord [61], Stator Ass’y [47], and Noise Suppressor [65]) from its root.
• Remove the CB terminal of the Stator Ass’y [47] connected to the CB tube, and then remove the two Hex.
Hd. Tapping Screws D4 x 60 [53] that secure the Stator Ass’y [47] to the Housing Ass’y [59]. Next,
remove the yellow internal wire from the switch. Face the matching surface of the Housing Ass’y [59]
and End Bracket [42] downward, and then strike the surface with a wooden hammer to pull out the
Stator Ass’y [47].
3. Disassembly of pulley (A) and pulley (B)
• Remove the two Machine Screws (Black) M4 x 16
[49] that secure the Belt Cover [39] to the End
Bracket [42], and then remove the Belt Cover
[39].
• Pulley (A) [50] and Pulley (B) [41] are fixed to the
armature shaft and cutter spindle with left-hand
and right-hand screws, respectively. Remove
Pulley (A) [50] with the Armature [45] set in a vice,
by inserting the end of a spanner into the side
groove of Pulley (A) [50], and then turning the
spanner clockwise.
• Also remove Pulley (B) [41] with the cutter block
ass’y set in a vice, by inserting the end of a
spanner into the side groove of Pulley (B) [41],
and then turning the spanner counterclockwise. To
protect your hands and fingers against possible
injury, wrap the cutter block ass’y with a thick cloth
beforehand.
-3-
4. Disassembly of the front base and rear base
• Turn Knob (A) [25], Lock Nut M10 [26], and
Knob (B) [27] counterclockwise to remove the
Front Base [24]. Secure Knob (B) [27] in place
and then pull up Knob (A) [25] to remove it.
Remove the four Tapping Screws (W/Flange)
D4 x 16 (Black) [69] on the Housing Ass’y [59]
to remove the Rear Base [68].
5. Disassembly of the cutter block ass’y from the end bracket
• Set the Cutter Block Ass’y [1][18] in a vice (and be careful to avoid damage), remove Pulley (B) [41],
and then strike the front edge of the spindle of the Cutter Block Ass’y [1][18] to remove the Cutter Block
Ass’y [1][18].
-4-
Conduct reassembly by reversing the disassembly procedure. However, special attention should be given
to the following:
• When connecting the internal wire to install the handle cover, be careful to avoid causing insufficient
withstand voltage due to the internal wire being caught between the handle cover and housing.
• Machine Screw (Black) M4 x 16 [49] ---------------------------------------
1.8 ± 0.4 N•m (18 ± 4 kgf•cm)
• Hex. Socket Set Screw M5 x 8 [33] ----------------------------------------- 0.5 to 1.0 N•m (5 to 10 kgf•cm)
• Bolt M6 [9] ------------------------------------------------------------------------- 10.0 to 15.0 N•m (100 to 150 kgf•cm)
• Brush Cap [37] ------------------------------------------------------------------- 1.0 ± 0.5 N•m (10 ± 5 kgf•cm)
• Pulley (A) [50] --------------------------------------------------------------------- 8.0 ± 1.0 N•m (80 ± 10 kgf•cm)
• Pulley (B) [41] --------------------------------------------------------------------- 8.0 ± 1.0 N•m (80 ± 10 kgf•cm)
• Tapping Screws D4 [21] [30] [32] [53] [69]-------------------------------- 2.0 ± 0.5 N•m (20 ± 5 kgf•cm)
Connect the wires as illustrated in the figure below.
Be careful to avoid inoperative rotation or a short-circuit due to defective wiring.
Reassembly
Connecting diagrams
Tightening torque
For Taiwan, China, Korea, New Zealand, Australia, Europe, and South Africa
For other countries
Brown or black
Blue or white
Switch
Blue
Stator ass’y
Stator coil
Stator coil
Noise su
pp
resso
r
Connecto
r
Choke coil
Choke coil
Power supply
Brown or black
Blue or white
Switch
Stator ass’y
Stator coil
Power supply
Stator coil
-5-
• Flatness of base -------------------------------------- Within 0.1 mm (of Front Base [24] and Rear Base [68])
• Parallelism of base ----------------------------------- Within 0.3 mm (as based on Rear Base [68])
Upon completing disassembly and repair, measure the insulation resistance and conduct a dielectric
strength test.
After no-load operation for 30 minutes, the no-load current values should be as follows:
Voltage (V) 110 120 220 230 240
Current (A) max. 2.3 to 3.1 2.2 to 3.0 1.3 to 1.9 1.0 to 1.5 1.0 to 1.5
Product accuracy
Insulation tests
No-load current value
-6-
MODEL
Variable
Fixed
10 20 30 40 50 60 min.
P 20SF
General Assembly
Front Base
Knob (A)
Knob (B)
Rear Base
End Bracket
Armature
Ass’y
Ball Bearing
(6200VV) x 2
Ball Bearing
(608VV) x 2
Cutter Block
Ass’y
*1
Cutter Block
Ass’y
*2
Stator Ass’y
Housing
Ass’y
Work Flow
Belt
Pulley (B)
Pulley (A)
Switch
Cord Armor
Cord
Planer
Blades
*1
Blade
Holder
*1
Planer
Blades
*2
Blade
Holder
*2
Bolt M6
*1: Replaceable blade specification
*2: Grinding blade specification
STANDARD REPAIR TIME (UNIT) SCHEDULES
Model P 20SF
PLANER
LIST NO. 0675
2012 · 10 · 12
(E2)
506
43
70
70
1
2
3
4
5
7
8
9
20
21
22
23
24
25
26
27
28
30
29
49
31
33
34
35
36
37
38
9
8
14
15
16
11
12
13
17
16
15
14
13
12
11
9
8
19
57
47
46
45
44
42
41
40
39
50
49
59
60
61
56
55
53
54
52
51
32
62
63
67
66
64
68
69
501
502
503
504
505
506
507
32
A
A
48
32
58
10
18
5
1
4
6
7
8
9
6
65
508
509
PART
S
P 20SF
DESCRIPTION REMARKS
* 1 334-480 CUTTER BLOCK ASS'Y (W/B.B) 1 INCLUD. 17, 19 EXCEPT FOR IND
* 2 879-418 PLANER BLADES (1 PAIR) 2 FOR DOUBLE EDGE BLADE TYPE
* 3 334-478 SET PLATE (B) (1 PAIR) 2 FOR DOUBLE EDGE BLADE TYPE
* 4 314-754 SET PLATE (A) 2 EXCEPT FOR IND
* 5 949-423 WASHER M4 (10 PCS.) 4 EXCEPT FOR IND
* 6 949-213 MACHINE SCREW M4 X 5 (10 PCS.) 4 EXCEPT FOR IND
* 7 316-398 BLADE HOLDER (1 PAIR) 2 EXCEPT FOR IND
8 334-706 WASHER 65MN T0.5 6
9 334-707 BOLT M6 6
* 10 314-746 PLANER BLADES 82 MM (1 PAIR) 2 EXCEPT FOR DOUBLE EDGE BLADE TYPE
* 11 949-216 MACHINE SCREW M4 X 10 (10 PCS.) 4 EXCEPT FOR DOUBLE EDGE BLADE TYPE FOR IND
* 12 958-731Z HOLDER SPRING (B) 4 EXCEPT FOR DOUBLE EDGE BLADE TYPE FOR IND
* 13 958-732Z GUARD PLATE (A) 4 EXCEPT FOR DOUBLE EDGE BLADE TYPE FOR IND
* 14 958-734Z BLADE HOLDER (1 PAIR) 2 EXCEPT FOR DOUBLE EDGE BLADE TYPE FOR IND
* 15 958-728 PLANER BLADES 82 MM (1 PAIR) 2 EXCEPT FOR DOUBLE EDGE BLADE TYPE FOR IND
* 16 958-733Z BACK METAL 2 EXCEPT FOR DOUBLE EDGE BLADE TYPE FOR IND
17 608-VVM BALL BEARING 608VVC2PS2L 1
* 18 334-481 CUTTER BLOCK ASS'Y (W/B.B) 1 INCLUD. 11-13, 17, 19 EXCEPT FOR
DOUBLE EDGE BLADE TYPE FOR IND
19 620-0VV BALL BEARING 6200VVCMPS2L 1
20 958-945 SCREW PLATE 1
21 954-004 TAPPING SCREW D4 X 16 1
22 958-709 SPRING 1
23 958-708 RUBBER PACKING 1
24 334-739 FRONT BASE 1
25 334-494 KNOB (A) 1
26 334-497 LOCK NUT M10 1
* 27 334-488 KNOB (B) 1
* 27 334-489 KNOB (B) 1 FOR USA, CAN
28 301-659 WASHER (B) 1
29 334-492 BEARING COVER 1
30 309-470
TAPPING SCREW (W/FLANGE) D4 X 12 (BLACK) 2
31 334-501 TIP COVER 1
32 301-653
TAPPING SCREW (W/FLANGE) D4 X 20 (BLACK) 8
33 938-477 HEX. SOCKET SET SCREW M5 X 8 2
34 NAME PLATE 1
35 957-571 BRUSH HOLDER 2
36 999-021 CARBON BRUSH (1 PAIR) 2
37 931-266 BRUSH CAP 2
* 38 334-736 CORD HOLDER 1
* 38 334-498 CORD HOLDER 1 FOR TPE, UAE, USA, CAN, MEX, BRA,
PAN (120 V), NOR, SWE, DEN, FIN
39 334-487 BELT COVER 1
40 958-718 BELT 1
41 334-491 PULLEY (B) 1
42 334-486 END BRACKET 1
43 620-0VV BALL BEARING 6200VVCMPS2L 1
44 334-713 WASHER (A) 1
* 45 360-936U ARMATURE ASS'Y 110 V-120 V 1 INCLUD. 43, 57
* 45 360-936H ARMATURE 110 V 1 FOR GBR (110 V), UAE, TPE
- 2 - 10 - 12
*ALTERNATIVE PARTS
ITEM
NO.
NO.
USED
CODE NO.
ITEM
NO.
NO.
USED
CODE NO.
PART
S
P 20SF
DESCRIPTION REMARKS
* 45 360-936D ARMATURE 127 V 1
* 45 360-936E ARMATURE 220 V-230 V 1
* 45 360-936G ARMATURE 220 V 1 FOR BRA (220 V), PAN (220 V),
INA, CHN, HKG, THA, KOR
* 45 360-936F ARMATURE 240 V 1
46 334-493 FAN GUIDE 1
* 47 340-834C STATOR ASS'Y 110 V 1 INCLUD. 48
* 47 340-835C STATOR ASS'Y 110 V-120 V 1
INCLUD. 48 FOR USA, CAN, PAN (120 V)
* 47 340-835D STATOR ASS'Y 127 V 1 INCLUD. 48
* 47 340-834E STATOR ASS'Y 220 V-230 V 1 INCLUD. 48
* 47 340-835E STATOR ASS'Y 220 V-230 V 1 INCLUD. 48 FOR BRA (220 V),
PAN (220 V), IND, LIB, THA, INA, SIN, HKG
* 47 340-834F STATOR ASS'Y 240 V 1 INCLUD. 48
* 47 340-835F STATOR ASS'Y 240 V 1 INCLUD. 48 FOR MAL, UAE
48 931-867 BRUSH TERMINAL 2
49 333-163 MACHINE SCREW (BLACK) M4 X 16 3
50 334-490 PULLEY (A) 1
51 334-485 GRIP COVER 1
52 334-484 HANDLE COVER 1
53 960-108 HEX. HD. TAPPING SCREW D4 X 60 2
* 54 334-474 SWITCH 1 W/OFF LOCK TYPE
* 54 322-101 SWITCH 1 W/ON LOCK TYPE
55 984-750 TAPPING SCREW (W/FLANGE) D4 X 16 2
56 937-631 CORD CLIP 1
57 608-VVM BALL BEARING 608VVC2PS2L 1
58 331-707 FASTON 1
* 59 334-482 HOUSING ASS'Y 1 INCLUD. 20, 21, 33, 35
* 59 334-483 HOUSING ASS'Y 1 INCLUD. 20, 21, 33, 35 FOR USA, CAN
60 953-327 CORD ARMOR D8.8 1
* 61 500-409Z CORD 1 (CORD ARMOR D8.8)
* 61 500-247Z CORD 1
(CORD ARMOR D8.8) FOR NOR, SWE, DEN, FIN
* 61 500-432Z CORD 1 (CORD ARMOR D8.8) FOR USA, CAN, MEX, PAN (120 V)
* 61 500-231Z CORD 1 (CORD ARMOR D8.8) FOR SIN, MAL, UAE
* 61 500-455Z CORD 1 (CORD ARMOR D8.8) FOR THA, CAN
* 61 500-435Z CORD 1
(CORD ARMOR D8.8) FOR GBR (230 V), HKG
* 61 500-461Z CORD 1 (CORD ARMOR D8.8) FOR GBR (110 V)
* 61 500-439Z CORD 1 (CORD ARMOR D8.8) FOR AUS, NZL
* 61 500-447Z CORD 1 (CORD ARMOR D8.8) FOR SUI
* 61 500-487Z CORD 1 (CORD ARMOR D8.8) FOR BRA
* 61 500-234Z CORD 1 (CORD ARMOR D8.8) FOR KOR
* 61 500-470Z CORD 1 (CORD ARMOR D8.8) FOR TPE
62 334-500 SPRING 1
63 334-499 STAND 1
* 64 961-419Z TERMINAL 1
FOR AUS, NZL, SAF, GBR, EUROPE, NOR,
SWE, DEN, FIN, AUT, TUR, SUI, RUS, CHN, TPE, KOR
* 65 994-273 NOISE SUPPRESSOR 1 FOR AUS, NZL, SAF, GBR, EUROPE, NOR, SWE,
DEN, FIN, AUT, TUR, SUI, RUS, CHN, TPE, KOR
* 66 959-140 CONNECTOR 50091 (10 PCS.) 1
* 66 959-141 CONNECTOR 50092 (10 PCS.) 2
FOR AUS, NZL, SAF, GBR, EUROPE, NOR, SWE,
DEN, FIN, AUT, TUR, SUI, RUS, CHN, TPE, KOR
10 - 12 - 3 -
*ALTERNATIVE PARTS
NO.
USED
CODE NO.
ITEM
NO.
PART
S
P 20SF
DESCRIPTION REMARKS
* 67 331-269 INTERNAL WIRE 1 FOR AUS, NZL, SAF, GBR, EUROPE, NOR, SWE,
DEN, FIN, AUT, TUR, SUI, RUS, CHN, TPE, KOR
68 334-838 REAR BASE 1
69 307-811
TAPPING SCREW (W/FLANGE) D4 X 16 (BLACK) 4
* 70 976-815 MACHINE SCREW (W/WASHERS) M4 X 8 4 FOR IND
DESCRIPTION REMARKS
* 501 334-693 SET GAUGE 1 FOR IND
502 940-543 BOX WRENCH 10 MM 1
503 958-842Z GUIDE 1
504 940-650 STOPPER SCREW M5 X 14 1
* 505 314-767 BLADE SHARPENING ASS'Y 1
EXCEPT FOR DOUBLE EDGE BLADE TYPE
* 506 334-735 CASE 1 FOR USA, CAN
* 506 334-475 CASE 1 FOR GBR, FRA, UAE, AUS, NZL
* 507 316-419 SET GAUGE 1 EXCEPT FOR IND
* 508 334-502 DUST ADAPTER 1 FOR USA, CAN
509 322-955 DUST BAG (BLACK) 1
DESCRIPTION REMARKS
601 334-503 ELBOW 1
- 4 - Printed in Japan 10 - 12
(121012N)
*ALTERNATIVE PARTS
OPTIONAL ACCESSORIES
STANDARD ACCESSORIES
NO.
USED
CODE NO.
ITEM
NO.
CODE NO.
ITEM
NO.
NO.
USED
CODE NO.
ITEM
NO.
NO.
USED
CODE NO.
ITEM
NO.
NO.
USED
CODE NO.
ITEM
NO.
/