6N4992 CAMSHAFT GROUP Serial No. 70V3431-Up 6N4991 Camshaft parts are shown on Page 17B 621B WHEEL TRACTOR

BASIC ENGINE

CAMSHAFT GP

0. 6N-4992 CAMSHAFT G
1. 4N-6598 CAMSHAFT A
2. 6N-1405 CAMSHAFT A
3. 6N-4991 CAMSHAFT A

CYLINDER HEAD GP

4. 4N-2260 CYLINDER H
5. 4N-2260 CYLINDER H
6. 4N-2260 CYLINDER H
7. 4N-2260 CYLINDER H
8. 4N-0749 CYLINDER H
9. 6N-9943 CYLINDER H
0. INFORMATION

WHEEL TRACTOR 621B WHEEL TRACTOR 45P
3406 VEHICULAR ENGINE 45P00001-UP (MACHINE) UEG0835S 621B 45P (1973)

BASIC ENGINE

CAMSHAFT GP

4N-0961 CAMSHAFT GROUP

6N-1406 CAMSHAFT GROUP

6N-4992 CAMSHAFT GP-SINGLE

4N-6598 CAMSHAFT ASSEMBLY

6N-1405 CAMSHAFT ASSEMBLY

6N-4991 CAMSHAFT AS

#UEG0835S0040

6N-4992: CAMSHAFT GP-SINGLE

CAMSHAFT GP-SINGLE

6N4992 CAMSHAFT GROUP
Serial No. 70V3431-Up
6N4991 Camshaft parts are shown on Page 17B

c156158 UEG0835S

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Parts for your 621B WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	0S-0509	[2]	BOLT
2.	4N-0342	[1]	PLATE
3.	6N-4991 Y	[1]	CAMSHAFT ASSEM.
			(Separate Illustration)
	Y		SEPARATE ILLUSTRATION

#UEG0835S0041

4N-6598: CAMSHAFT ASSEMBLY

CAMSHAFT ASSEMBLY

4N6598 CAMSHAFT ASSEMBLY
Serial No. 70V1 to 70V1235 inclusive
Part of 4N961 Camshaft Group shown on Page 17

c202840 UEG0835S

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Parts for your 621B WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name	Comments
1.	4N-0355	[1]	GEAR (64 teeth)
2.	1B-8705	[1]	KEY

#UEG0835S0042

6N-1405: CAMSHAFT ASSEMBLY

CAMSHAFT ASSEMBLY

6N1405 CAMSHAFT ASSEMBLY
Serial No. 70V1236 to 70V3430 inclusive
Part of 6N1406 Camshaft Group shown on Page 17

c152538 UEG0835S

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Parts for your 621B WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name	Comments
1.	4N-0355	[1]	GEAR (64 teeth)
2.	1B-8705	[1]	KEY

#UEG0835S0043

6N-4991: CAMSHAFT AS

CAMSHAFT AS

6N4991 CAMSHAFT ASSEMBLY
Serial No. 70V3431-Up
Part of 6N4992 Camshaft Group shown on Page 17A

c228211 UEG0835S

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Parts for your 621B WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	7N-6682 C	[1]	GEAR (64 teeth)
2.	1B-8705	[1]	KEY
	C		INDICATES CHANGE

#UEG0835S0044

4N-2260: CYLINDER HEAD GP

CYLINDER HEAD GP

4N2260 CYLINDER HEAD GROUP
Serial No. 70V1 to 70V2265 inclusive. 4N749 Cylinder Head parts are shown on Page 20
Refer also to Page 22B for special parts

c205466 UEG0835S

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Parts for your 621B WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	4N-7253	[6]	GASKET
2.	2S-2251	[6]	SEAL
3.	4N-3714	[6]	CHAMBER ASSEM.
4.	5F-4899 C	[12]	BOLT
5.	Y	[1]	CYLINDER HEAD
			(Separate Illustration)
6.	6L-7442	[6]	STUD
7.	3J-5390	[4]	PLUG
8.	3J-5389 C	[2]	PLUG
9.	4N-1044	[1]	GASKET
10.	7L-0520 C	[12]	STUD
11.	2H-3750	[20]	BOLT
	5H-1504	[20]	WASHER
12.	4N-2269	[24]	SEAL
13.	3J-5389 C	[1]	PLUG
			(Use Without Air Compressor)
	C		INDICATES CHANGE
	Y		SEPARATE ILLUSTRATION

#UEG0835S0045

4N-2260: CYLINDER HEAD GP

CYLINDER HEAD GP

4N2260 CYLINDER HEAD GROUP
Serial No. 70V2266 to 70V2773 inclusive. 4N749 Cylinder Head parts are shown on Page 20
Refer also to Page 22B for special parts

c158808 UEG0835S

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Parts for your 621B WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	4N-7253	[6]	GASKET
2.	2S-2251	[6]	SEAL
3.	4N-3714	[6]	CHAMBER ASSEM.
4.	5F-4899	[12]	BOLT
5.	4N-0749 CY	[1]	CYLINDER HEAD
			(Separate Illustration)
6.	6L-7442	[6]	STUD
7.	3J-5390	[4]	PLUG
8.	3J-5389	[2]	PLUG
9.	4N-1044	[1]	GASKET
10.	4S-6137 C	[11]	STUD 8.13 cm(3.20 in.) long
11.	2H-3750	[20]	BOLT
	5H-1504	[20]	WASHER
12.	4N-2269	[24]	SEAL
13.	3J-5389	[1]	PLUG
			(Use Without Air Compressor)
14.	7L-0520 C	[1]	STUD 5.08 cm(2 in.) long
	C		INDICATES CHANGE
	Y		SEPARATE ILLUSTRATION

#UEG0835S0046

4N-2260: CYLINDER HEAD GP

CYLINDER HEAD GP

4N2260 CYLINDER HEAD GROUP
Serial No. 70V2774 to 70V3144 inclusive. 6N9943 Cylinder Head parts are shown on Page 20A
Refer also to Page 22B for special parts

c161294 UEG0835S

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Parts for your 621B WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	4N-7253	[6]	GASKET
2.	2S-2251	[6]	SEAL
3.	4N-3714	[6]	CHAMBER ASSEM.
4.	5F-4899	[12]	BOLT
5.	6N-9943 CY	[1]	CYLINDER HEAD
			(Separate Illustration)
6.	6L-7442	[6]	STUD
7.	3J-5390	[4]	PLUG
8.	3J-5389	[2]	PLUG
9.	4N-1044	[1]	GASKET
10.	4S-6137	[11]	STUD 8.13 cm(3.20 in.) long
11.	2H-3750	[20]	BOLT
	5H-1504	[20]	WASHER
12.	4N-2269	[24]	SEAL
13.	3J-5389	[1]	PLUG
			(Use Without Air Compressor)
14.	7L-0520	[1]	STUD 5.08 cm(2 in.) long
	C		INDICATES CHANGE
	Y		SEPARATE ILLUSTRATION

#UEG0835S0047

4N-2260: CYLINDER HEAD GP

CYLINDER HEAD GP

4N2260 CYLINDER HEAD GROUP
Serial No. 70V3145-Up
7N1302 Cylinder Head parts are shown on Page 20B

c162994 UEG0835S

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Parts for your 621B WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	4N-7253	[6]	GASKET
2.	2S-2251	[6]	SEAL
3.	4N-3714	[6]	CHAMBER ASSEM.
4.	5F-4899	[12]	BOLT
5.	7N-1302 CY	[1]	CYLINDER HEAD
			(Separate Illustration)
6.	6L-7442	[6]	STUD
7.	3J-5390	[4]	PLUG
8.	3J-5389	[2]	PLUG
9.	7N-0626 C	[1]	GASKET
10.	4S-6137	[11]	STUD 8.13 cm(3.20 in.)long
11.	2H-3750	[20]	BOLT
	5H-1504	[20]	WASHER
12.	4N-2269	[24]	SEAL
13.	3J-5389	[1]	PLUG
			(Use without Air Compressor)
14.	7L-0520	[1]	STUD 5.08 cm(2 in.) long
15.	3S-5496 C	[2]	SEAL
	C		INDICATES CHANGE
	Y		SEPARATE ILLUSTRATION

#UEG0835S0048

4N-0749: CYLINDER HEAD GROUP

CYLINDER HEAD GROUP

4N749 CYLINDER HEAD GROUP
Serial No. 70V1 to 70V2773 inclusive
Part of 4N2260 Cylinder Head Group shown on Pages 18 and 19

c150840 UEG0835S

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Parts for your 621B WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	4N-5906	[24]	SPRING
2.	2N-5571 C	[24]	ROTOCOIL
3.	2A-4429	[48]	LOCK
4.	4N-5079	[1]	HEAD ASSEM.
5.	2N-5775	[12]	DOWEL
6.	4N-5893	[12]	INSERT
	4S-8898 H	[12]	INSERT .005 in. (.13mm)oversize
	4S-8899 H	[12]	INSERT .010 in. (.26mm)oversize
7.	2M-6471	[1]	PLUG
8.	9S-9699	[12]	INSERT
	4S-8902 H	[12]	INSERT .005 in. (.13mm)oversize
	4S-8903 H	[12]	INSERT .010 in. (.26mm)oversize
9.	3B-0623	[10]	PLUG
10.	4N-2803	[24]	GUIDE
11.	3B-0645	[12]	PLUG
12.	4N-5654	[12]	VALVE (intake)
13.	4N-5653	[12]	VALVE (exhaust)
	C		INDICATES CHANGE
	H		NOT PART OF 4N5079 ASSEM.

#UEG0835S0049

6N-9943: CYLINDER HEAD GP

CYLINDER HEAD GP

6N9943 CYLINDER HEAD GROUP
Serial No. 70V2774 to 70V3144 inclusive
Part of 4N2260 Cylinder Head Group shown on Page 19A

c161295 UEG0835S

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Parts for your 621B WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	4N-5906	[24]	SPRING
2.	2N-5571	[24]	ROTOCOIL
3.	2A-4429	[48]	LOCK
4.	6N-9938	[1]	HEAD ASSEM.
			(Includes)
5.	2N-5775	[12]	DOWEL
6.	4N-5893	[12]	INSERT
	4S-8898 H	[12]	INSERT .13mm(.005in.)oversize
	4S-8899 H	[12]	INSERT .26mm(.010in.)oversize
7.	2M-6471	[1]	PLUG
8.	9S-9699	[12]	INSERT
	4S-8902 H	[12]	INSERT .13mm(.005in.)oversize
	4S-8903 H	[12]	INSERT .26mm(.010in.)oversize
9.	3B-0623	[10]	PLUG
10.	4N-2803	[24]	GUIDE
11.	3B-0645	[12]	PLUG
12.	4N-5654	[12]	VALVE (intake)
13.	4N-5653	[1]	VALVE (exhaust)
	H		NOT PART OF 6N9938 ASSEM.