4N2740 EXHAUST EXTENSION GROUP 621 WHEEL TRACTOR

Pos.	Part No	Qty	Parts name
1.	1W-8415	[1]	TUBE
2.	7S-7680	[1]	CLAMP ASSEM.
3.	7S-7680	[1]	CLAMP
4.	4N-5959	[1]	PLATE
5.	4N-5960	[1]	ELBOW
6.	0S-1590	[2]	BOLT 50.8mm(2 in.)long
	1B-5355	[2]	NUT 8.33mm(.328 in.) thick
7.	0S-1588	[4]	BOLT 31.75mm(1.25 in.)lg
	1B-5355	[4]	NUT 8.33mm(.328 in.) thick
8.	5M-2894	[6]	WASHER

#SEBP24290071

8N-3592: MUFFLER GP

MUFFLER GP

8N3592 MUFFLER GROUP

c174267 SEBP2429

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	6N-4184	[1]	MUFFLER ASSEM.
2.	2P-6184	[2]	STRAP
3.	6F-7012	[2]	STUD
4.	8N-3408	[1]	BRACKET ASSEM.
5.	1A-2029	[2]	BOLT
6.	0S-1588	[2]	BOLT
7.	4N-8495	[1]	BRACKET ASSEM.
8.	0S-1590	[4]	BOLT
9.	5M-2894	[14]	WASHER
10.	1D-4717	[6]	NUT

#SEBP24290072

6G-3400: SHIELD GP-ENGINE

SHIELD GP-ENGINE

6G3400 ENGINE COMPARTMENT SHIELD GROUP

c939424 SEBP2429

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	6G-7206	[1]	DEFLECTOR ASSEM.
			(Includes)
2.	9F-2978	[14]	NUT
3.	031-0219	[1]	BOLT
	1D-4717	[1]	NUT
4.	2R-1159	[1]	CLAMP
5.	6G-7207	[1]	COLLAR ASSEM.
	5T-5380	[1]	ADAPTER
6.	5D-0353	[24]	BOLT
7.	6G-7208	[1]	DEFLECTOR ASSEM.
			(Includes)
8.	6B-4594	[6]	RIVET
9.	2J-3118	[6]	BOLT
10.	6G-7226	[1]	SUPPORT ASSEM.
			(Includes)
11.	9F-2978	[4]	NUT
12.	6G-7259	[1]	PLATE
13.	6G-7289	[1]	SHIELD ASSEM.
			(Includes)
	9F-2978	[1]	NUT
14.	6G-7897	[1]	BAFFLE ASSEM.
15.	5K-9107	[2]	BOLT
16.	9L-9132	[24]	WASHER
17.	6G-2162	[1]	SHIELD ASSEM.
18.	0T-0573	[1]	BOLT
19.	6G-7887	[1]	BAFFLE ASSEM.
20.	6G-7258	[1]	PLATE
21.	5M-2894	[9]	WASHER
22.	8N-3597	[1]	BRACE ASSEM.
			(Includes)
	9F-2978	[1]	NUT (weld)
23.	0S-1591	[1]	BOLT

#SEBP24290073

4N-2739: DUST EJECTOR GP

DUST EJECTOR GP

4N2739 DUST EJECTOR GROUP

c201347 SEBP2429

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	9S-1102	[2]	HOSE
2.	5P-0597	[4]	CLAMP
3.	1H-7859	[1]	TUBE
4.	4N-8503	[1]	TUBE ASSEM.
5.	1B-5355	[2]	NUT

#SEBP24290074

8D-7805: CONTROL GP-GOVERNOR

CONTROL GP-GOVERNOR

8D7805 GOVERNOR CONTROL GROUP

c939425 SEBP2429

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	1B-4669	[2]	COLLAR
2.	7D-0001	[1]	BRACKET
3.	030-8535	[4]	BOLT
4.	5M-2894	[12]	LOCKWASHER
5.	4D-2619	[2]	BEARING
6.	8D-7539	[1]	PEDAL
7.	5D-0353	[6]	BOLT
8.	2G-4721	[1]	PLATE ASSEM.
			(Includes)
	9F-2978	[3]	NUT (weld)
9.	6N-8863	[2]	WASHER
10.	4B-3573	[2]	SETSCREW
	1B-2578	[2]	NUT
11.	7B-6473	[1]	GASKET
12.	8D-7801	[1]	BRACKET
13.	8D-7798	[1]	SHAFT
14.	030-8537	[1]	BOLT
15.	9S-8752	[3]	NUT
16.	2G-4618	[1]	LEVER
17.	1B-8704	[2]	KEY
18.	4M-0497	[1]	NUT
19.	4D-4064	[1]	ROD END
20.	4M-0496	[1]	BOLT
21.	5B-9079	[2]	NUT
22.	6D-0475	[1]	LINK ASSEM.
23.	2A-5546	[1]	BOLT
	9S-8750	[1]	NUT
24.	5T-7451	[1]	LEVER
25.	4K-4726	[1]	ROD END
26.	5P-9938	[1]	BOLT
27.	6K-1898	[1]	SPRING
28.	1A-2029	[1]	BOLT

#SEBP24290075

8N-5535: GOV & FUEL INJ PUMP GP

GOV & FUEL INJ PUMP GP

8N5535 GOVERNOR AND FUEL INJECTION PUMP GROUP
8N5534 Governor, 8N5533 Pump and 4N4267 Torque Control parts are shown on Pages 61, 62, 63 and 64

c939426 SEBP2429

8N5535 GOV & FUEL INJ PUMP GP Parts scheme

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	8N-5533 Y	[1]	PUMP GROUP
			(Separate Illustration)
2.	6N-9339	[1]	GASKET
3.	5J-5314	[2]	BOLT
4.	0S-1618	[2]	BOLT
5.	8N-5534 Y	[1]	GOVERNOR GROUP
			(Separate Illustration)
6.	4N-4267 Y	[1]	TORQUE SPRING
			(Separate Illustration)
7.	2N-0828	[2]	WASHER (wave)
	2P-9556	[1]	WASHER (plain)
8.	9L-6448	[1]	SPRING
9.	1H-5514	[2]	BOLT
	Y		SEPARATE ILLUSTRATION

#SEBP24290076

8N-5534: GOVERNOR GP

GOVERNOR GP

8N5534 GOVERNOR GROUP--Part 1 of 2
Part of 8N5535 Governor & Fuel Injection Pump Group shown on Page 60

c939427 SEBP2429

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	2P-8697	[1]	GASKET
2.	3P-0009	[1]	INSULATOR
3.	9S-4468	[1]	BOLT
4.	2F-4159	[1]	LOCK
5.	9M-6302	[2]	WASHER
6.	9M-6303	[1]	SPRING
7.	1W-4640	[1]	SEAT
8.	2S-0007	[1]	SLEEVE
9.	7B-8105	[1]	LOCK
10.	9L-4990	[1]	WEIGHT ASSEM.
11.	9S-4673	[1]	BAND ASSEM.
12.	9M-6293	[1]	LOCK
13.	0S-1615	[3]	BOLT
14.	4N-3383	[1]	PISTON ASSEM.
			(Includes)
	7S-8447	[1]	PISTON AND VALVE ASSEM.
15.	4N-3507	[1]	CYLINDER
16.	4N-0820	[1]	SLEEVE
17.	5P-9757	[1]	SEAL
18.	3K-0810	[1]	RING
19.	7M-7219	[1]	BEARING
20.	7M-7193	[2]	RACE
21.	1W-4642	[1]	RISER
22.	2P-8630	[1]	DOWEL
23.	6N-3504	[1]	SEAT
24.	8H-9181	[1]	SPRING
25.	8M-8739	[1]	BOLT
26.	2P-8679	[1]	STRAINER ASSEM.
27.	9M-4704	[1]	SCREW
28.	8L-4154	[1]	COLLAR
29.	8L-4155	[1]	SCREW
	1B-4201	[1]	NUT
30.	6N-6116	[1]	COVER
31.	9N-3096	[1]	SPRING

#SEBP24290077

8N-5534: GOVERNOR GP

GOVERNOR GP

8N5534 GOVERNOR GROUP--Part 2 of 2
Part of 8N5535 Governor & Fuel Injection Pump Group shown on Page 60

c939428 SEBP2429

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	7N-2333	[1]	HOUSING ASSEM.
			(Includes)
2.	4F-4585	[1]	PLUG
3.	8S-0134	[1]	BEARING
4.	4N-4879	[1]	PLUG
5.	9S-0798	[1]	BEARING
6.	8M-8403	[1]	GUIDE
7.	5L-8991	[1]	GASKET
8.	8S-8952	[1]	SCREW (high idle)
9.	2W-1494	[1]	LEVER ASSEM.
			(Includes)
	2W-1491	[1]	LEVER ASSEM.
10.	5H-1351	[1]	PIN
11.	5S-9635	[1]	SPRING
12.	9M-9788	[1]	PLUNGER
13.	5L-8997	[1]	SCREW (low idle)
14.	2J-0157	[2]	SEAL
15.	5L-8992	[1]	COVER
16.	5P-6945	[1]	BOLT
17.	9M-1974	[4]	WASHER
18.	4B-9747	[1]	WASHER
19.	9M-8720	[1]	BOLT
20.	8L-8883	[1]	SHAFT
21.	5P-3272	[1]	SEAL
22.	8H-9204	[1]	WASHER
23.	2B-2694	[1]	BOLT
24.	5B-5620	[3]	BOLT

#SEBP24290078

8N-5533: PUMP GP-FUEL INJECTION

PUMP GP-FUEL INJECTION

8N5533 FUEL INJECTION PUMP GROUP
Part of 8N5535 Governor & Fuel Injection Pump Group shown on Page 60
6N7829 Pump parts are shown on Page 64

c939429 SEBP2429

8N5533 PUMP GP-FUEL INJECTION Parts scheme

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	1M-1077	[6]	SEAL
2.	2M-4314	[6]	BUSHING
3.	8H-9204	[6]	WASHER
4.	6N-7829 Y	[6]	PUMP GROUP
			(Separate Illustration)
5.	8D-8428	[1]	FITTING
6.	7M-8485	[1]	O-RING
7.	8N-1916	[1]	RACK
8.	4N-7354	[1]	SPACER
9.	8H-9206	[6]	SPACER
10.	4N-7353	[1]	PLATE
11.	6N-7216	[1]	SPRING
12.	8N-6981	[6]	LIFTER ASSEM.
13.	4B-3388	[4]	BOLT
14.	7F-8036	[1]	LOCK
15.	6N-3599	[1]	GEAR ASSEM.
	6N-3598	[1]	GEAR (72 teeth)
16.	4N-2483	[1]	SPRING
17.	4N-4051	[1]	YOKE
18.	6D-9953	[2]	PIN (spring)
19.	4N-0627	[1]	PIN
20.	6N-7823	[1]	CAMSHAFT ASSEM.
21.	9F-7882	[1]	DOWEL
22.	6N-4448	[1]	HOUSING ASSEM.
23.	4B-9782	[1]	BALL
24.	4M-1474	[3]	PIN
25.	9S-4160	[1]	BEARING
26.	1N-5999	[3]	PLUG (straight thread)
	7J-0204	[3]	SEAL
27.	1P-0232	[6]	BALL
	1P-0234	[6]	DOWEL
28.	1S-7101	[2]	BEARING
29.	9F-2247	[1]	PLUG
30.	9S-9702	[2]	DOWEL
31.	1S-7103	[1]	BEARING
32.	1S-1953	[1]	BEARING
33.	6N-7217	[1]	PLATE ASSEM.
34.	6N-7221	[1]	PLATE
35.	6N-7220	[1]	PLATE
	Y		SEPARATE ILLUSTRATION

#SEBP24290079

4N-4267: TORQUE CONTROL GP

TORQUE CONTROL GP

4N4267 TORQUE CONTROL GROUP
Part of 8N5535 Governor & Fuel Injection Pump Group shown on Page 60

c228212 SEBP2429

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	4F-7957	[2]	BOLT
2.	9M-6292	[1]	LOCK-NUT
3.	4N-4218	[1]	CONTACT
4.	2S-7391	[1]	BAR-STOP
5.	8M-9062	[1]	RETAINER-SPRING
6.	1P-9958 C	[1]	INSULATOR
7.	3S-0602	[1]	RETAINER-SPRING
8.	1P-6452	[1]	INSULATOR
9.	9L-7235 C	[1]	SHIM-TORQUE SPRING
	C		CHANGE FROM PREVIOUS TYPE