3S9620 FUEL PUMP HOUSING GROUP--Part 1 of 2--Type 2 Serial No. 23H779, 785, 790 to 800, 802 to 808, 810 to 858, 860 to 862, 864 to 866, 868 to 916, 918 to 981, 983 to 1029 and 23H1031-Up. Part of Fuel Pump Housing, Drive and Governor shown on Pages 42 and 42A 621

FUEL SYSTEM

PUMP GP-FUEL TRANSFER

0. 3S-9620 FUEL PUMP
1. 3S-9620 FUEL PUMP

LINES GP-FUEL INJECTION

2. FUEL INJEC
3. FUEL INJEC
4. FUEL INJEC

LUBRICATION SYSTEM

LINES GP-ENGINE OIL

5. OIL LINES

FILTER GP-ENGINE OIL

6. 1S-5132 OIL FILTER

PUMP GP-ENGINE OIL

7. OIL PUMP A
8. 1S-9523 OIL PUMP A

OPERATOR STATION

PANEL GP

9. GAUGES
0. INFORMATION

WHEEL TRACTOR 621 WHEEL TRACTOR 23H
621 TRACTOR 23H00001-02222 (MACHINE) UE070042 621 23H (1966)

FUEL SYSTEM

PUMP GP-FUEL TRANSFER

4S-5661 FUEL TRANSFER PUMP GROUP

3S-9620 FUEL PUMP HOUSING GROUP

#UE0700420090

3S-9620: FUEL PUMP HOUSING GROUP

FUEL PUMP HOUSING GROUP

3S9620 FUEL PUMP HOUSING GROUP--Part 1 of 2--Type 2
Serial No. 23H779, 785, 790 to 800, 802 to 808, 810 to 858, 860 to 862, 864 to 866, 868 to
916, 918 to 981, 983 to 1029 and 23H1031-Up. Part of Fuel Pump Housing, Drive and Governor shown on Pages 42 and 42A

c115206 UE070042

3S9620 FUEL PUMP HOUSING GROUP Parts scheme

For full view, you need register

Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	5S-4524	[1]	HOUSING ASSEM.
2.	9H-4926	[1]	FERRULE
3.	5F-1749	[2]	DOWEL
4.	9H-1296	[1]	BEARING
5.	5M-6214	[1]	PLUG
6.	1P-0234 C	[8]	DOWEL
	1P-0232	[8]	BALL
7.	1P-0233 C	[8]	DOWEL
	1P-0231	[8]	BALL
8.	0T-0200	[1]	PLUG
9.	1S-7101	[2]	BEARING
10.	1S-7103	[1]	BEARING
11.	5S-4526	[1]	BEARING
12.		[2]	PLUG
13.	4M-1474 C	[4]	PIN
14.	1S-7595	[1]	SLEEVE
15.	1S-7315	[1]	BEARING
16.	6F-0984	[1]	DOWEL
17.	7M-5839	[1]	PLUG
18.	9S-4197	[1]	BUSHING
			(Parts of 5S4524 Housing Assem.)
19.	1B-7182	[1]	BOLT
	3B-4505	[1]	LOCKWASHER
20.	1S-7316	[1]	PLATE
21.	4B-4277	[1]	WASHER
22.	1S-9546	[1]	GASKET
23.	8F-0394	[1]	SPRING
24.	1S-9480	[1]	PIN
25.	2S-8084	[1]	RACK
26.	0S-1617	[2]	BOLT
	2S-4068	[1]	LOCK
27.	4S-7794	[1]	CAMSHAFT ASSEM.
28.	4S-5662	[1]	PIN
29.	1S-9481	[1]	COVER
	C		INDICATES CHANGE

#UE0700420091

3S-9620: FUEL PUMP HOUSING GROUP

FUEL PUMP HOUSING GROUP

3S9620 FUEL PUMP HOUSING GROUP--Part 2 of 2--Type 2
Serial No. 23H779, 785, 790 to 800, 802 to 808, 810 to 858, 860 to 862, 864 to 866, 868 to 916,
918 to 981, 983 to 1029 and 23H1031-Up. Part of Fuel Pump Housing, Drive and Governor shown on Pages 42 and 42A

c115207 UE070042

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	2S-7018	[1]	GASKET
2.	1B-7182	[2]	BOLT
	4B-4277	[2]	WASHER
3.	3S-5759	[1]	LEVER
4.	2S-7020	[1]	COVER ASSEM.
5.	4F-3492	[1]	DOWEL
6.	2A-5222	[1]	WASHER
7.	2A-5220	[1]	PLUG
8.	2M-4314	[8]	BUSHING
9.	1B-7182	[2]	BOLT
	3B-4505	[2]	LOCKWASHER
10.	8H-9204	[8]	WASHER
11.	8S-0218	[1]	PIN ASSEM.
12.	4M-0411	[8]	BONNET
13.	9B-1363	[8]	SPRING
14.	8S-0219	[1]	FLANGE
15.	1S-7057	[2]	GASKET
16.	1M-1077	[8]	SEAL
17.	1M-3506	[8]	RING
18.	9H-5746	[8]	CHECK
19.	5M-2697	[8]	SPACER (.170" Thick)
	2M-4208	[8]	SPACER (.174" Thick)
	2M-4209	[8]	SPACER (.178" Thick)
	2M-4210	[8]	SPACER (.182" Thick)
	2M-4211	[8]	SPACER (.186" Thick)
	2M-4212	[8]	SPACER (.190" Thick)
	5M-2691	[8]	SPACER (.194" Thick)
20.	3S-8336	[8]	PLUNGER AND BARREL ASSEM.
21.	1S-7592	[8]	SPRING
22.	9H-5729	[8]	WASHER
23.	3S-9736	[8]	LIFTER ASSEM.

#UE0700420092

FUEL INJECTION VALVES AND LINES

FUEL INJECTION VALVES AND LINES
Serial No. 23H1 to 244, 246, 249 to 380, 390, 391, 394, 400, 403, 406, 410, 419, 447, 459, 483,
494, 498, 505, 507, 561, 605 and 23H630 inclusive

c78789 UE070042

None FUEL INJECTION VALVES AND LINES Parts scheme

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	1S-9272	[1]	TUBE
2.	0S-0509	[1]	BOLT
	1D-4717	[1]	NUT
3.	3B-4506	[5]	LOCKWASHER
4.		[1]	CLIP
5.	2B-2404	[1]	CLIP
6.	1S-9274	[1]	TUBE
7.	3B-8995	[3]	FITTING
8.	1F-1344	[3]	NUT
			(1 in each 3B8995 Fitting)
9.	3B-8996	[1]	FITTING
10.	8F-8997	[1]	NUT
			(Part of 3B8996 Fitting)
11.	1S-5185	[1]	LINE ASSEM. (No. 8)
12.	1S-5183	[1]	LINE ASSEM. (No. 6)
13.	5H-6005	[8]	SEAL
14.	3S-1004	[8]	LINE ASSEM.
15.	1S-9323	[8]	ADAPTER ASSEM.
16.	1S-5181	[1]	LINE ASSEM. (No. 4)
17.	1S-5179	[1]	LINE ASSEM. (No. 2)
18.	2S-8179	[4]	RETAINER (Steel)
19.	1A-2029	[4]	BOLT
20.	2S-8182	[4]	DAMPER (Rubber)
21.	2S-8185	[4]	DAMPER (Rubber)
22.	2S-8181	[4]	RETAINER (Steel)
23.	1S-7106	[1]	COVER
	1S-7107	[1]	GASKET
24.	2B-2695	[2]	BOLT
	3B-4505	[2]	LOCKWASHER
25.	1S-5178	[1]	LINE ASSEM. (No. 1)
26.	2S-9828	[8]	NOZZLE ASSEM.
27.	2S-9872	[8]	NUT
28.	3S-3498	[8]	BODY
29.	1S-5180	[1]	LINE ASSEM. (No. 3)
30.	1S-5182	[1]	LINE ASSEM. (No. 5)
31.	2A-5328	[8]	LOCK
32.	1D-4716	[8]	NUT
33.	1S-5184	[1]	LINE ASSEM. (No. 7)
34.	2S-5249	[1]	TUBE
35.	3L-5987	[1]	COVER
	6L-1597	[1]	GASKET
36.	1D-4533	[2]	BOLT
	1B-4330	[2]	NUT
	3B-4504	[2]	LOCKWASHER
	2F-2990	[32]	PLUG (Protection)
			(Not Shown-2 in each Line Assem.)

#UE0700420093

FUEL INJECTION VALVES AND LINES

FUEL INJECTION VALVES AND LINES
Serial No. 23H245, 247, 248, 381 to 389, 392, 393, 395 to 399, 401, 402, 404, 405, 407 to 409, 411 to 418, 420 to 446,
448 to 458, 460 to 482, 484 to 493, 495 to 497, 499 to 504, 506, 508 to 560, 562 to 604, 606 to 629, 631 to 874, 876,
878, 880 to 883, 885, 887 to 889, 894, 897, 900, 903, 905, 906, 910, 914, 917, 934, 982 and 23H1030 inclusive

c121649 UE070042

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	1S-9272	[1]	TUBE
2.	0T-0102	[1]	BOLT
3.	3B-4506	[1]	LOCKWASHER
4.		[1]	CLIP
5.	2B-2404	[1]	CLIP
6.	1S-9274	[1]	TUBE
7.	3B-8995	[3]	FITTING
8.	1F-1344	[3]	NUT
			(1 in each 3B8995 Fitting)
9.	3B-8996	[1]	FITTING
10.	8F-8997	[1]	NUT
			(Part of 3B8996 Fitting)
11.	1S-5185	[1]	LINE ASSEM. (No. 8)
12.	1S-5183	[1]	LINE ASSEM. (No. 6)
13.	5H-6005	[8]	SEAL
14.	3S-1004	[8]	LINE ASSEM.
15.	1S-9323	[8]	ADAPTER ASSEM.
16.	1S-5181	[1]	LINE ASSEM. (No. 4)
17.	1S-5179	[1]	LINE ASSEM. (No. 2)
18.	5S-5996	[4]	CLAMP ASSEM.
19.	1B-2790	[8]	BOLT
20.	1D-4716	[8]	NUT
21.	3B-4505	[10]	LOCKWASHER
22.	1S-7106	[1]	COVER
23.	1S-7107	[1]	GASKET
24.	2B-2695	[2]	BOLT
25.	1S-5178	[1]	LINE ASSEM. (No. 1)
26.	2S-9828	[8]	NOZZLE ASSEM.
27.	2S-9872	[8]	NUT
28.	3S-3498	[8]	BODY
29.	5S-5993	[1]	LINE ASSEM. (No. 3)
30.	5S-5995	[1]	LINE ASSEM. (No. 5)
31.	2A-5328	[8]	LOCK
32.	1D-4716	[8]	NUT
33.	1S-5184	[1]	LINE ASSEM. (No. 7)
34.	2S-5249	[1]	TUBE
35.	3L-5987	[1]	COVER
	6L-1597	[1]	GASKET
36.	1D-4533	[2]	BOLT
	1B-4330	[2]	NUT
	3B-4504	[2]	LOCKWASHER

#UE0700420094

FUEL INJECTION VALVES AND LINES

FUEL INJECTION VALVES AND LINES
Serial No. 23H875, 877, 879, 884, 886, 890 to 893, 895, 896, 898, 899, 901, 902, 904, 907 to 909, 911 to 913,
915, 916, 918 to 933, 935 to 981, 983 to 1029 and 23H1031-up

c127277 UE070042

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	1S-9272	[1]	TUBE
2.	0T-0102	[1]	BOLT
3.	3B-4506	[1]	LOCKWASHER
4.	9S-1350	[1]	CLIP
5.	2B-2404	[1]	CLIP
6.	1S-9274	[1]	TUBE
7.	3B-8995	[2]	FITTING
8.	1F-1344	[2]	NUT
			(1 in each 3B8995 Fitting)
9.	3B-8996	[1]	FITTING
10.	8F-8997	[1]	NUT
			(Part of 3B8996 Fitting)
11.	1S-5185	[1]	LINE ASSEM. (No. 8)
12.	1S-5183	[1]	LINE ASSEM. (No. 6)
13.	5H-6005	[8]	SEAL
14.	3S-1004	[8]	LINE ASSEM.
15.	1S-9323	[8]	ADAPTER ASSEM.
16.	1S-5181	[1]	LINE ASSEM. (No. 4)
17.	1S-5179	[1]	LINE ASSEM. (No. 2)
18.	7S-5040	[2]	CLAMP ASSEM.
19.	4B-3388	[8]	BOLT
20.	7S-1781	[1]	CLAMP ASSEM.
21.	3B-4505	[10]	LOCKWASHER
22.	1S-7106	[1]	COVER
23.	1S-7107	[1]	GASKET
24.	2B-2695	[2]	BOLT
25.	1S-5178	[1]	LINE ASSEM. (No. 1)
26.	2S-9828	[8]	NOZZLE ASSEM.
27.	2S-9872	[8]	NUT
28.	3S-3498	[8]	BODY
29.	5S-5993	[1]	LINE ASSEM. (No. 3)
30.	5S-5995	[1]	LINE ASSEM. (No. 5)
31.	2A-5328	[8]	LOCK
32.	1D-4716	[8]	NUT
33.	1S-5184	[1]	LINE ASSEM. (No. 7)
34.	4S-8385 H		TUBE 12.75"
35.	3B-8998	[1]	FITTING
	1F-1344	[1]	NUT
			(Part of 3B8998 Fitting)
36.	1S-1225	[1]	SEAL
	H		ORDER BY THE FOOT

#UE0700420095

OIL LINES

c105167 UE070042

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	0T-0055	[2]	BOLT
2.	3B-4506	[15]	LOCKWASHER
3.	1S-6595	[1]	GASKET
4.	0S-1594	[4]	BOLT
5.	1S-4810	[1]	GASKET
6.	6K-4949	[1]	CLIP ASSEM.
7.	1D-4539	[1]	BOLT
8.	4B-4277	[1]	WASHER
9.	8M-5900	[1]	FITTING
	8F-9362	[2]	NUT
			(Part of 8M5900 Fitting)
10.	8M-5266	[1]	SEAL
11.	1A-2029	[2]	BOLT
12.	2S-4204	[1]	ELBOW
13.	2S-5632	[1]	GAUGE ASSEM.
14.	2S-5629	[1]	TUBE ASSEM.
			(Oil Level Gauge Guide)
15.	5D-6523	[1]	CLIP
16.	7F-7889	[1]	GASKET
17.	3B-9053	[1]	FITTING
	8F-8998	[1]	NUT
			(Part of 3B9053 Fitting)
18.	4S-7868	[1]	TUBE (Oil Cooler Drain)
19.	3B-8997	[1]	FITTING
	8F-8998	[1]	NUT
			(Part of 3B8997 Fitting)
20.	4S-8792	[1]	ADAPTER
21.	1S-9527	[1]	GASKET
22.	8M-1869	[1]	PLUG
23.	0S-1587	[1]	BOLT (1.75" Long)
24.	9S-1366	[1]	BOLT (2.50" Long)
25.	3B-4508	[2]	LOCKWASHER
26.	7M-7410	[1]	PLUG
27.	1F-6068	[1]	FITTING
	8F-9362	[1]	NUT
			(Part of 1F6068 Fitting)
28.	2S-0538	[1]	TUBE (33.50" Long)
			(Ref. No. 38 to Oil Filter Base)
29.	8H-9402	[1]	ADAPTER
	9H-4557	[2]	SEAL
30.	2H-2519	[1]	GASKET
31.	1S-7654	[1]	COVER
	1S-7331	[1]	GASKET
32.	0S-1590	[6]	BOLT
33.	2S-4181	[1]	TUBE ASSEM. (Oil Drain)
34.	2S-0542	[1]	TUBE ASSEM. (Oil Supply)
35.	6B-5703	[1]	SPACER
36.	3B-4505	[1]	LOCKWASHER
37.	7S-1717	[1]	BRACKET
38.	0L-1351	[1]	BOLT
39.	1D-4717	[1]	NUT
40.	3J-5389	[1]	PLUG

#UE0700420096

1S-5132: OIL FILTER ASSEMBLY

OIL FILTER ASSEMBLY

1S5132 OIL FILTER ASSEMBLY

c105164 UE070042

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	8H-1454	[3]	CASE ASSEM.
2.	8H-1462	[3]	COVER ASSEM.
3.	5M-5999	[3]	GASKET
4.	1K-2728	[3]	GASKET
5.	3H-3385	[3]	SEAL
6.	6B-0806	[3]	SPRING
7.	8H-1461	[3]	PLATE
8.	7F-7691	[3]	CLIP
9.	8H-1460	[3]	SCREW
			(1 each in 8H1462 Cover Assem.)
10.	9M-3873	[3]	STUD ASSEM.
11.	4H-3119	[3]	PIN (Spring)
			(1 in each 9M3873 Stud Assem.)
12.	5S-0484	[3]	ELEMENT ASSEM.
			(Disposable)
13.	2M-8691	[3]	GASKET
14.	0S-1588 H	[7]	BOLT
15.	3B-4506 H	[8]	LOCKWASHER
16.	1S-9544 H	[2]	SEAL
17.	0S-1590 H	[1]	BOLT
18.	2S-0543	[1]	BASE ASSEM.
	1S-8881	[2]	FERRULE
19.	0L-2288	[1]	PLUG
20.	3L-1850	[3]	PLUG
21.	9M-0853	[2]	PLUNGER
22.	6F-8007	[2]	SPRING
23.	6B-0831	[1]	GASKET
24.	2M-1538	[4]	STUD
25.	8M-9928	[1]	PLUNGER
26.	8M-9929	[1]	RETAINER
27.	9M-4685	[1]	SPRING
28.	6B-0830	[1]	COVER
29.	0S-1617	[2]	BOLT
30.	3B-4505	[2]	LOCKWASHER
31.	2H-8829	[1]	PLUG
32.	4F-9325	[1]	GASKET
			(Parts of 2S543 Base Assem.)
33.	6L-1651 H	[2]	SEAL
34.	8H-1495	[2]	CLAMP
35.	0S-1588	[4]	BOLT
36.	3B-4506	[4]	LOCKWASHER
37.	1M-7360	[2]	CLAMP
	H		NOT PART OF 1S5132 OIL FILTER

#UE0700420097

OIL PUMP AND DRIVE

c129231 UE070042

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	0S-1571	[2]	BOLT (1.75" long)
2.	7H-1861	[6]	LOCK
3.	8M-5249	[1]	SEAL
4.	1S-9523 Y	[1]	PUMP ASSEM.
			(See Separate Illustration)
5.	1S-5948	[1]	GEAR ASSEM. (44 Teeth)
	1S-5944	[1]	BEARING
			(Part of 1S5948 Gear Assem.)
6.	0S-1590	[1]	BOLT (2" long)
7.	2H-3755	[4]	BOLT
8.	1M-7390	[4]	LOCK
9.	1S-2835	[1]	GEAR (44 Teeth)
10.	3B-5412	[1]	NUT
11.	9S-1302	[1]	WASHER
12.	3B-4619	[1]	COTTER PIN
13.	2S-4001	[1]	BAFFLE
14.	8M-5599	[1]	KEY
15.	7M-4353	[2]	GASKET
16.	7B-2742	[6]	BOLT
17.	8F-8682	[2]	LOCK
18.	2S-2726	[1]	SCREEN ASSEM.
19.	1S-7404	[1]	BELL
20.	1S-7389	[1]	COVER
21.	0S-1588	[2]	BOLT
22.	7M-0168	[1]	LOCK
23.	2S-0356	[1]	GASKET
24.	0L-1143	[1]	BOLT (2.50" long)
	Y		SEPARATE ILLUSTRATION

#UE0700420098

1S-9523: OIL PUMP ASSEMBLY

OIL PUMP ASSEMBLY

1S9523 OIL PUMP ASSEMBLY
Part of Oil Pump and Drive

c97074 UE070042

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	1S-9565	[1]	BODY ASSEM.
2.	1S-9529	[1]	BEARING
3.		[1]	SHAFT
			(Parts of 1S9565 Body Assem.)
4.	1S-9827	[1]	GEAR ASSEM. (12 Teeth -Idler)
5.	1S-9572	[2]	BEARING
			(Part of 1S9827 Gear Assem.)
6.	2S-5175	[1]	SPACER
7.	1S-9826	[1]	GEAR ASSEM. (12 Teeth- Idler)
8.	1S-9572	[2]	BEARING
			(Part of 1S9826 Gear Assem.)
9.	8M-5599	[1]	KEY
10.	1S-9571	[1]	SHAFT ASSEM. (12 Teeth- Drive)
11.	8M-9096	[1]	GEAR (12 Teeth- Drive)
12.	4S-6562	[1]	KEY
13.	1B-2886	[2]	BOLT (3.75" Long)
	0S-1573	[2]	BOLT (4" Long)
	4H-2010	[4]	LOCK
14.	0S-1588	[1]	BOLT
15.	0L-0364	[3]	LOCK
16.	3S-5823	[1]	SPRING
	2S-2781	[1]	PLUNGER
17.	9M-7579	[1]	COVER
18.	0T-0573	[2]	BOLT
19.	4S-5355	[1]	DIFFUSER
20.	1S-5953	[1]	BODY ASSEM.
21.	8M-1063	[2]	DOWEL
22.	1S-9402	[2]	DOWEL
23.	1S-9529	[1]	BEARING
24.	1S-5946	[1]	SHAFT ASSEM.
25.	5B-5821	[1]	DOWEL
			(Parts of 1S5953 Body Assem.)

#UE0700420099

GAUGES

GAUGES
Serial No. 23H1 to 23H216 inclusive

c98363 UE070042

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	5D-0746	[1]	PANEL
2.	3D-5073	[2]	SEAL
3.	5M-1065	[1]	GAUGE (Oil Pressure)
	3D-2675	[1]	COUPLING
4.	3K-0443	[1]	GAUGE (Air Pressure)
5.	1L-6561	[1]	PLUG
6.	5D-7842	[1]	PANEL
7.	5S-8167	[1]	TACHOMETER ASSEM.
	5H-4131	[1]	KEY
			(Part of 5S8167 Tachometer Assem.)
8.	5S-9068	[1]	GAUGE (Fuel Pressure)
	3B-7763	[1]	COUPLING
9.	5H-4778	[2]	UNION
10.	3D-8929	[1]	HOSE ASSEM. (24.25" Long Overall)
11.	5B-1959	[1]	ADAPTER
	2B-5721	[1]	GASKET
12.	4D-2560	[1]	UNION
13.	7H-9899	[1]	GASKET
14.	4B-6029	[2]	GROMMET
15.	4B-0418	[2]	CLIP
16.	4D-6463	[1]	CLIP
17.	4D-2560	[1]	UNION
18.	6H-6699	[1]	ADAPTER
19.	8M-2772	[2]	CLIP
20.	5D-6119	[1]	HOSE ASSEM. (122" Long Overall)
21.	0T-0102	[1]	BOLT
	3B-4506	[1]	LOCKWASHER
22.	4D-6463	[1]	CLIP
23.	6H-4005	[4]	GROMMET
24.	1S-9389	[1]	CABLE ASSEM.
25.	4D-1848	[1]	INDICATOR (converter temperature)
26.	1H-3337	[8]	BOLT
	3D-5074	[8]	NUT
	4D-3397	[2]	STRAP
27.	7F-6429	[1]	AMMETER
28.	3S-4824	[1]	INDICATOR (Heat)