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