Z4551-93121 (001)
BRUSHCUTTERS
BK3400FL
BK3400FT
BK3400FLJ
BK4300FL
BK4300FT
NOTE :
1. Use KOMATSU ZENOAH genuine parts as specified in the parts list for repair and/or replacement.
2. KOMATSU ZENOAH does not warrant the machines, which have been damaged by the use of any
parts other than those specified by the company.
3. When placing parts orders for repair and/or replacement, check if the model name and the serial
number are applicable to those specified in the parts list, then use parts number described in the
parts list.
4. The contents described in the parts list are accurate as of the date and may change due to
improvement.
5. The parts for the machine shall be supplied ten (10) years after the machine is discontinued. [It is
possible that some specific parts may be subject to change of their delivery term and list price
within the limit of ten (10) years after the machine is discontinued. It is also possible that some
parts may be available even after the limit of ten (10) years.]
Jan 2000
APPLICABLE SERIAL NUMBERS:
000101 and up
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BK3400FL/BK4300FL
Fig.1 DRIVE UNIT & ACCESSORIES
Q'TY
Q'TY
/UNIT
Key# PART NUMBER
DESCRIPTION
NOTE
Key# PART NUMBER
DESCRIPTION
NOTE
/UNIT
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
3
1
1
6
1
1
1
1
1
1
1
1
1
–
–
1
3
3
3
1
–
1
1
2
1
1
1
1
2
–
1
1
2
2
1
1
3
6
6
6
1
1
1
2
6129-13001 GEARCASE ASSY
6129-13110 • GEARCASE
6129-13120 • BEARING
06004-06201 • BEARING
04065-03212 • SNAPRING
6129-13211 • SHAFT, gear
6129-13220 • GEAR
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
01641-21423 WASHER
2
04064-01510 SNAPRING
0224-30625 BOLT
1
3
1
4
0280-10605 NUT
1
5
6129-61100 CORD COMP
6129-61210 BAND
1
6
2
7
1600-72210 SWITCH
6129-72230 NUT
1
8
6129-13310 • PINION
1
9
06000-06000 • BEARING
06001-06000 • BEARING
04065-02612 • RING
3310-31720 BOLT
4
10
11
12
13
14
15
4551-85000 TANK ASSY
1403-85304 • CAP ASSY
1400-85326 • • CAP, inner
1030-85140 • • ELEMENT
1600-85322 • • PACKING
4551-85100 • JOINT ASSY
1400-85141 • • GROMMET
3063-22510 • • CLIP
1
1
3180-13340 • RING
1
6129-13240 • HOLDER(A)
6129-13250 • HOLDER(B)
6129-13260 • WASHER
1
1
1
16 T3002-13260 • NUT
M6
1
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
6129-13350 • BOLT
0224-00625 • BOLT
M6x8
2
4551-86110 • • PIPE
1
0260-00512 • SCREW
6129-13910 COVER
01252-30510 BOLT
3570-15311 • SPRING
1535-85520 BAND
1
2
6129-91001 TOOL SET
1030-91340 • DRIVER
3144-91160 • SOCKET
09007-00425 • WRENCH
1000-91301 TANK ASSY
6229-12401 LEVER ASSY
0263-90512 SCREW
1
3540-13283 COVER
6129-12100 PIPE COMP
3180-11321 • BUSHING
6129-12120 • BEARING COMP
06002-00607 • • BEARING
6129-12130 • • SPACER
6129-12210 SHAFT
1
1
1
1
1
OP
1
6129-12220 SHAFT, joint
6129-12230 CLAMP
0263-10510 SCREW
01252-30520 BOLT
6129-14110 GRIP
–—–—–—– –—–—–
–—–—–—– –—–—–
6232-14300 HANDLE ASSY
0260-00530 • SCREW
0292-20510 • WASHER
0280-10504 • NUT
1088-82201 LEVER ASSY
–—–—–—– –—–—–
6129-24110 GUARD
3541-24121 CLAMP
3540-24130 BOLT
6129-21000 SHAFT FLEX ASSY
6129-21110 • SHAFT-FLEX
6129-21120 • LINER
07000-12018 • O-RING
6129-21160 CLAMP
–—–—–—– –—–—–
6189-15110 SAW 12'
6129-51110 FRAME
5940-14170 WASHER
0263-10512 SCREW
5940-14300 PAD ASSY
6129-51500 BAND ASSY
6129-51310 JOINT
5940-13170 WASHER
5940-13180 WASHER
5940-13160 NUT
M5 PW
M5 SW
M5
6129-51200 PLATE, engine COMP
4551-13310 BRACKET, engine
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BK3400FLJ
Fig.2 DRIVE UNIT & ACCESSORIES
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BK3400FLJ
Fig.2 DRIVE UNIT & ACCESSORIES
Q'TY
Q'TY
Key# PART NUMBER
DESCRIPTION
NOTE
Key# PART NUMBER
1400-85326 • • CAP, inner
1030-85140 • • ELEMENT
DESCRIPTION
NOTE
/UNIT
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
3
1
1
1
1
1
1
3
3
3
1
1
1
2
1
1
1
1
2
1
1
2
2
1
1
3
6
6
6
1
1
2
1
1
1
1
2
1
1
3
1
1
/UNIT
1
1
1
1
1
2
1
1
2
1
1
1
1
1
1
3
1
1
1
1
3
1
1
1
1
1
1
1
1
1
2
1
1
2
1
2
6129-13001 GEARCASE ASSY
6129-13110 • GEARCASE
6129-13120 • BEARING
06004-06201 • BEARING
04065-03212 • SNAPRING
6129-13211 • SHAFT, gear
6129-13220 • GEAR
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
3
1600-85322 • • PACKING
4551-85100 • JOINT ASSY
1400-85141 • • GROMMET
3063-22510 • • CLIP
4
5
6
7
4551-86110 • • PIPE
8
6129-13310 • PINION
06000-06000 • BEARING
06001-06000 • BEARING
04065-02612 • RING
3180-13340 • RING
3570-15311 • SPRING
9
1535-85520 BAND
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
63
54
55
56
57
58
59
60
61
62
6129-91001 TOOL SET
1030-91340 • DRIVER
3144-91160 • SOCKET
09007-00425 • WRENCH
1000-91301 TANK ASSY
6036-12100 PIPE(F) COMP
3180-11321 • BUSHING
6129-12120 • BEARING COMP
06002-00607 • • BEARING
6129-12130 • • SPACER
6036-12300 PIPE(R) COMP
3180-11321 • BUSHING
6129-12120 • BEARING COMP
06002-00607 • • BEARING
6129-12130 • • SPACER
6036-12400 PIPE, JOINT ASSY
6036-12410 • PIPE, JOINT COMP
6036-12420 • KNOB BOLT
01643-30823 • WASHER
01252-30510 • BOLT
6129-13240 • HOLDER(A)
6129-13250 • HOLDER(B)
6129-13260 • WASHER
T3002-13260 • NUT
M6
6129-13350 • BOLT
M6x8
0224-00625 • BOLT
0260-00512 • SCREW
6129-13910 COVER
01252-30510 BOLT
3540-13283 COVER
6129-12230 CLAMP
0263-10510 SCREW
01252-30520 BOLT
6129-14110 GRIP
6232-14300 HANDLE ASSY
0260-00530 • SCREW
0292-20510 • WASHER
0280-10504 • NUT
3540-13260 • BOLT
1088-82201 LEVER ASSY
6129-24110 GUARD
3541-24121 CLAMP
6036-12210 SHAFT
6129-12220 SHAFT, joint
6036-12240 SHAFT, joint
6036-12250 SPACER
3540-24130 BOLT
6129-21000 SHAFT FLEX ASSY
6129-21110 • SHAFT-FLEX
6129-21120 • LINER
07000-12018 • O-RING
6129-21160 CLAMP
6189-15110 SAW 12'
6129-51110 FRAME
5940-14170 WASHER
0263-10512 SCREW
5940-14300 PAD ASSY
6129-51500 BAND ASSY
6129-51310 JOINT
5940-13170 WASHER
5940-13180 WASHER
5940-13160 NUT
M5 PW
M5 SW
M5
6129-51200 PLATE, engine COMP
6129-51410 BRACKET, engine
01641-21423 WASHER
04064-01510 SNAP RING
0224-30625 BOLT
0280-10605 NUT
6129-61100 CORD COMP
6129-61210 BAND
1600-72210 SWITCH
1520-72230 NUT
3310-31720 BOLT
4551-85000 TANK ASSY
1403-85304 • CAP ASSY
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BK3400FT/BK4300FT
Fig.3 DRIVE UNIT & ACCESSORIES
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BK3400FT/BK4300FT
Fig.3 DRIVE UNIT & ACCESSORIES
Q'TY
Q'TY
/UNIT
Key# PART NUMBER
DESCRIPTION
NOTE
Key# PART NUMBER
DESCRIPTION
NOTE
/UNIT
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
3
1
1
6
1
1
1
1
1
1
1
1
1
1
2
–
–
–
–
–
1
1
1
2
1
1
1
1
2
1
–
1
2
2
1
1
3
6
6
6
1
1
1
2
6129-13001 GEARCASE ASSY
6129-13110 • GEARCASE
6129-13120 • BEARING
06004-06201 • BEARING
04065-03212 • SNAPRING
6129-13211 • SHAFT, gear
6129-13220 • GEAR
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
01641-21423 WASHER
2
04064-01510 SNAPRING
0224-30625 BOLT
1
3
1
4
0280-10605 NUT
1
5
6129-61100 CORD COMP
6129-61210 BAND
1
6
2
7
1600-72210 SWITCH
6129-72230 NUT
1
8
6129-13310 • PINION
1
9
06000-06000 • BEARING
06001-06000 • BEARING
04065-02612 • RING
3310-31720 BOLT
4
10
11
12
13
14
15
4551-85000 TANK ASSY
1403-85304 • CAP ASSY
1400-85326 • • CAP, inner
1030-85140 • • ELEMENT
1600-85322 • • PACKING
4551-85100 • JOINT ASSY
1400-85141 • • GROMMET
3063-22510 • • CLIP
1
1
3180-13340 • RING
1
6129-13240 • HOLDER(A)
6129-13250 • HOLDER(B)
6129-13260 • WASHER
1
1
1
16 T3002-13260 • NUT
M6
1
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
6129-13350 • BOLT
0224-00625 • BOLT
M6x8
2
4551-86110 • • PIPE
3570-15311 • SPRING
1535-85520 BAND
1
0260-00512 • SCREW
6129-13910 COVER
01252-30510 BOLT
1
2
6129-91001 TOOL SET
1030-91340 • DRIVER
3144-91160 • SOCKET
09007-00425 • WRENCH
0263-90512 SCREW
1
3540-13283 COVER
6129-12100 PIPE COMP
3180-11321 • BUSHING
6129-12120 • BEARING COMP
06002-00607 • • BEARING
6129-12130 • • SPACER
6129-12210 SHAFT
1
1
1
1
6129-12220 SHAFT, joint
6129-12230 CLAMP
0263-10510 SCREW
01252-30520 BOLT
6129-14110 GRIP
3570-32130 GRIP
3213-11340 BAND
–—–—–—– –—–—
–—–—–—– –—–—
–—–—–—– –—–—
–—–—–—– –—–—
–—–—–—– –—–—
6229-12401 LEVER ASSY
6129-24110 GUARD
3541-24121 CLAMP
3540-24130 BOLT
6129-21000 SHAFT FLEX ASSY
6129-21110 • SHAFT-FLEX
6129-21120 • LINER
07000-12018 • O-RING
6129-21160 CLAMP
6129-92310 SAW 12'
–—–—–—– –—–—
6129-51110 FRAME
5940-14170 WASHER
0263-10512 SCREW
5940-14300 PAD ASSY
6129-51500 BAND ASSY
6129-51310 JOINT
5940-13170 WASHER
5940-13180 WASHER
5940-13160 NUT
M5 PW
M5 SW
M5
6129-51200 PLATE,engine COMP
4551-13310 BRACKET,engine
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BK3400FL/BK3400FLJ/BK3400FT
Fig.4 Engine G34L
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BK3400FL/BK3400FLJ/BK3400FT
Fig.4 Engine G34L
Q'TY
/UNIT
Q'TY
Key# PART NUMBER
DESCRIPTION
NOTE
Key# PART NUMBER
DESCRIPTION
NOTE
/UNIT
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
2
1
1
1
2
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
4
1
2
4700-12110 • CYLINDER
1
4
1
1
3
1
2
1
1
4
1
1
2
1
2
1
2
1
2
1
2
2
2
1
1
1
1
2
1
1
1
2
1
1
1
1
2
1
1
4
1
1
4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
4
1
–
1
63
64
4700-13150 GASKET, INSU
4750-13130 GASKET, CARB
T1024-81000 CARBURETOR-A
1141-81110 • CAP
3310-12281 • BOLT
4500-13120 • GASKET, CYL
4500-21100 • CRANKCASE-C
2629-21130 • • PIN
3
65
4
66
5
67
1141-81120 • CAP
6
4500-21140 • GASKET, CASE
06030-06201 • BEARING
2169-21210 • SEAL
68
1030-81000 • SPRING
4770-81150 • VALVE, throttle
1030-81000 • RECEIVE
T1024-81210 • NEEDLE, jet
1030-81000 • CLIP
7
69
8
70
9
1650-21220 • SEAL
71
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
01252-30530 • BOLT
04065-03212 • SNAPRING
4700-41110 • PISTON
1650-41210 • RING, PISTON
1030-41310 • PIN
72
73
00263-00306 • SCREW
T1024-81240 • JET, main
2751-81250 • SCREW
1650-81260 • SPRING
1695-81180 • FLOAT
74
75
76
1300-41320 • RING
77
2850-41410 • BEARING
2850-41510 • WASHER
4500-42000 • CRANKSHAFT-C
4700-51110 SHOE
78
1695-81321 • PACKING
1614-81310 • CHAMBER
1695-81340 • HINGE
79
80
81
1181-81210 • PIN
1651-51220 SPRING
1200-51211 SCREW
1200-51230 WASHER
1200-51241 WASHER
4700-71110 ROTOR
4700-71200 COIL-A
82
1695-81360 • VALVE
83
1179-81221 • PACKING
1179-81501 • COCK-A
1140-81650 • SCREW
1400-81660 • PACKING
00263-10416 • SCREW
4770-81710 • PIPE
84
85
86
87
4500-71220 • CORD,HIGH
4700-71230 • CAP
88
89
1220-81420 • STAY
4700-71240 • PIN
90
2166-81500 • BOLT
1900-72120 SPRING
5500-72130 GROMMET
1900-72111 CAP
91
0263-90560 SCREW
92
1400-82002 CLEANER-A
1400-82113 • BODY
93
4500-72150 BOLT
94
1400-82121 • COVER
1418-82130 • ELEMENT
1400-82141 • SCREEN
4550-82150 SCREW
1650-43230 NUT
95
1000-43240 KEY
96
T1024-15110 MUFFLER
3310-31720 BOLT (STAY)
01252-30560 BOLT
97
98
1133-82060 LABEL
99
2193-86150 CLAMP
4700-15211 GASKET,MUFFLER
4700-31110 COVER, FAN
3310-12281 BOLT
100
101
102
103
104
105
106
107
108
109
110
1660-31121 LABEL, COVER
T1024-75410 LABEL, RECOIL
T1024-75410 LABEL, RECOIL
1475-83101 CABLE-C
6129-11100 HOUSING-ASSY
06002-06001 • BEARING
04065-02812 • RING
BK3400FL
BK3400FT
4700-31210 PLATE, VOLUTE
4550-32110 COVER, CYLINDER
4500-32120 SCREW
4500-32210 GUARD
1881-73110 SPARKPLUG
1852-72121 GROMMET
T1006-73220 CORD
1140-72231 CLAMP
CJ-6Y
6278-12311 • DRUM
04064-01210 • SNAP RING
3577-12200 • STOPPER-C
0263-30620 SCREW
4500-75100 RECOIL-A
4500-75120 • REEL
4500-75150 • SCREW
1850-75130 • SPRING
4500-75180 • COLLAR
4500-75190 • ARM
4500-75160 • ROPE
1140-75320 • KNOB
5500-75170 • PLATE
4500-75210 PULLEY
4500-75511 SCREW
4500-75310 PLATE, INERTIA
–—–—–—– –—–—
4750-13160 INSULATOR
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BK4300FL/BK4300FT
Fig.5 Engine G43L
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BK4300FL/BK4300FT
Fig.5 Engine G43L
Q'TY
/UNIT
Q'TY
Key# PART NUMBER
DESCRIPTION
NOTE
Key# PART NUMBER
DESCRIPTION
NOTE
/UNIT
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
2
2
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
4
1
2
4500-12110 • CYLINDER
1
4
1
1
3
1
2
1
1
4
1
1
2
1
2
1
2
1
2
1
2
2
2
1
1
1
1
2
1
1
1
2
1
1
1
1
2
1
1
4
1
1
4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
4
1
1
1
63
64
4500-13150 GASKET, INSU
3310-12281 • BOLT
4500-13120 • GASKET, CYL
4500-21100 • CRANKCASE-C
2629-21130 • • PIN
4550-13130 GASKET, CARB
4550-81000 CARBURETOR-A
1650-81121 • CAP
3
65
4
66
5
67
1141-81120 • CAP
6
4500-21140 • GASKET, CASE
06030-06201 • BEARING
2169-21210 • SEAL
68
1335-81060 • SPRING
4550-81150 • VALVE
1335-81070 • RECEIVE
4550-81210 • NEEDLE
1030-81000 • CLIP
7
69
8
70
9
1650-21220 • SEAL
71
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
01252-30530 • BOLT
04065-03212 • SNAPRING
4500-41110 • PISTON
1400-41220 • RING, PISTON
2850-41310 • PIN
72
73
1400-81230 • JET NEEDLE
4550-81240 • JET
74
75
2751-81250 • SCREW
1650-81260 • SPRING
1335-81180 • FLOAT
1400-81320 • PACKING
1400-81310 • CHAMBER
1400-81340 • HINGE
1400-81350 • PIN
76
1300-41320 • RING
77
2850-41410 • BEARING
2850-41510 • WASHER
4500-42000 • CRANKSHAFT-C
4500-51110 SHOE
78
79
80
81
4500-51220 SPRING
1200-51211 SCREW
1200-51230 WASHER
1200-51241 WASHER
4500-71110 ROTOR
4500-71200 COIL-A
82
1400-81361 • VALVE
1400-81540 • O RING
1403-81500 • COCK
83
84
85
1400-81650 • SCREW
1400-81660 • PACKING
0260-10410 • SCREW
4550-81710 • PIPE
86
87
4500-71220 • CORD,HIGH
2616-71320 • CAP
88
89
0260-10412 • SCREW
0263-90565 SCREW
1400-82002 CLEANER-A
1400-82113 • BODY
3356-21130 • PIN
90
1900-72120 SPRING
5500-72130 GROMMET
1900-72111 CAP
91
92
93
1400-82121 • COVER
1418-82130 • ELEMENT
1400-82141 • SCREEN
4550-82150 SCREW
1133-82060 LABEL
4500-72150 BOLT
94
1650-43230 NUT
95
1000-43240 KEY
96
4550-15110 MUFFLER
3310-31720 BOLT (STAY)
01252-30565 BOLT
97
98
2193-86150 CLAMP
99
1660-31121 LABEL, COVER
4550-75410 LABEL, RECOIL
4552-75410 LABEL, RECOIL
1475-83101 CABEL-C
6129-11100 HOUSING-ASSY
06002-06001 • BEARING
04065-02812 • RING
6278-12311 • DRUM
4700-15211 GASKET,MUFFLER
4500-31110 COVER, FAN
3310-12281 BOLT
100
101
102
103
104
105
106
107
108
109
BK4300FL
BK4300FT
4500-31210 PLATE, VOLUTE
4550-32110 COVER, CYLINDER
4500-32120 SCREW
4500-32210 GUARD
1881-73110 SPARKPLUG
1852-72121 GROMMET
4550-71240 CORD
CJ-6Y
04064-01210 • SNAP RING
3577-12200 • STOPPER-C
0263-30620 SCREW
1140-72231 CLAMP
4500-75100 RECOIL-A
4500-75120 • REEL
4500-75150 • SCREW
1850-75130 • SPRING
4500-75180 • COLLAR
4500-75190 • ARM
4500-75160 • ROPE
1140-75320 • KNOB
5500-75170 • PLATE
4500-75210 PULLEY
4500-75511 SCREW
4500-75310 PLATE, INERTIA
01643-30823 WASHER
4550-13160 INSULATOR
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1-9 Minamidai, Kawagoe, Saitama, 350-1192 Japan
PRINTED ON RECYCLED PAPER
IMPRIMÉ SUR PAPIER RECYCLÉ
GEDRUCKT AUF RECYCLING PAPIER
STAMPATO SU CARTA RICICLATA
IMPRESO EN PAPEL RECICLADO
PRINTED IN JAPAN
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