3P3474 TRANSMISSION CASE AND COVERS GROUP Serial No. 50W1 to 3455, 3458, 3459, 3477 to 3479 and 50W3484 inclusive and Test No. 1 to 3615 inclusive. Part of 3P9094 Transmission Arrangement shown on Page 113 988B

POWER TRAIN

TRANSMISSION GP

0. 3P-3474 CASE & PAR
1. 3P-3474 CASE & PAR
2. 3P-3474 CASE & PAR
3. TRANSMISSI

SHAFT GP

4. 1V-4943 DRIVE SHAF
5. 1V-4943 DRIVE SHAF
6. 1V-4943 DRIVE SHAF
7. 1V-4942 DRIVE SHAF
8. 1V-2605 DRIVE SHAF
9. 5V-0621 DRIVE SHAF
0. INFORMATION

WHEEL LOADER 988B WHEEL LOADER 50W
988B WHEEL LOADER 50W00001-06040 (MACHINE) POWERED BY 3408 ENGINE SEBP1079 988B 50W (1976)

POWER TRAIN

TRANSMISSION GP

3P-3057 PLANETARY GP

3P-3474 CASE & PARTS GP

TRANSMISSION CASE REPLACEMENT

#SEBP10790420

3P-3474: CASE & PARTS GP

CASE & PARTS GP

3P3474 TRANSMISSION CASE AND COVERS GROUP
Serial No. 50W1 to 3455, 3458, 3459, 3477 to 3479 and 50W3484 inclusive and Test
No. 1 to 3615 inclusive. Part of 3P9094 Transmission Arrangement shown on Page 113

c209482 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	0S-1594	[18]	BOLT
2.	3B-4506	[25]	LOCKWASHER
3.	8S-5820	[1]	BREATHER
4.	3P-3596	[1]	COVER ASSEM.
	3P-3461	[1]	GASKET
5.	1D-4717	[4]	NUT
6.	3S-1372	[1]	COVER
	3S-1373	[1]	GASKET
7.	0S-1587	[2]	BOLT
	3B-4508	[2]	LOCKWASHER
8.	5P-2587	[1]	SEAL
9.	3P-4654	[1]	CASE ASSEM.
			(Includes)
10.	1A-2223	[2]	DOWEL
11.	8M-4986	[2]	SEAL
12.	2M-3403	[1]	BOLT
13.	3P-9922	[2]	MANIFOLD
14.	9S-4191	[2]	PLUG
	3J-1907	[2]	SEAL
15.	9S-4183	[1]	PLUG
	3D-2824	[1]	SEAL

#SEBP10790421

3P-3474: CASE & PARTS GP

CASE & PARTS GP

3P3474 TRANSMISSION CASE AND COVERS GROUP
IF TRANSMISSION IS SERIALIZED, USE TRANSMISSION SERIAL NO. OTHERWISE
USE VEHICLE SERIAL NO. Vehicle Serial No. 50W3456, 3457, 3460 to 3476, 3480 to
3483 and 50W3485 to 50W4353 inclusive and Test No. 3616-Up. Transmission Serial
No. 2MA1 to 2MA775 inclusive. Part of 3P9094 Transmission Arrangement shown on
Page 113. For field replacement of 7G7135 Case Assembly refer to Page 126C

c172452 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	0S-1594	[18]	BOLT
2.	3B-4506	[25]	LOCKWASHER
3.	4H-6112 C	[1]	BREATHER
4.	3P-3596	[1]	COVER ASSEM.
	3P-3461	[1]	GASKET
5.	1D-4717	[4]	NUT
6.	3S-1372	[1]	COVER
	3S-1373	[1]	GASKET
7.	0S-1587	[2]	BOLT
	3B-4508	[2]	LOCKWASHER
8.	5P-2587	[1]	SEAL
9.	7G-7135 C	[1]	CASE ASSEM.
			(Includes)
10.	1A-2223	[2]	DOWEL
11.	8M-4986	[2]	SEAL
12.	2M-3403	[1]	BOLT
13.	3P-9922	[2]	MANIFOLD
14.	9S-4191	[2]	PLUG
	3J-1907	[2]	SEAL
15.	9S-4183	[1]	PLUG
	3D-2824	[1]	SEAL
	C		INDICATES CHANGE

#SEBP10790422

3P-3474: CASE & PARTS GP

CASE & PARTS GP

3P3474 TRANSMISSION CASE AND COVERS GROUP
Transmission Serial No. 2MA776-Up
Part of 3P9094 Transmission Arrangement shown on Page 113. For field replacement
of 7G7135 Case Assembly refer to Page 126C

c177761 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	0L-1351 C	[18]	BOLT
2.	3B-4506	[3]	LOCKWASHER
3.	4H-6112	[1]	BREATHER
4.	7G-3739 C	[1]	COVER ASSEM.
	3P-3461	[1]	GASKET
5.	1D-4717	[4]	NUT
6.	8K-4909 C	[1]	PLATE
	7G-3737 C	[1]	GASKET
7.	0S-1587	[2]	BOLT
	3B-4508	[2]	LOCKWASHER
8.	5P-2587	[1]	SEAL
9.	7G-7135	[1]	CASE ASSEM.
			(Includes)
10.	1A-2223	[2]	DOWEL
11.	8M-4986	[2]	SEAL
12.	2M-3403 C	[3]	BOLT
13.	3P-9922	[2]	MANIFOLD
14.	9S-4191	[2]	PLUG
	3J-1907	[2]	SEAL
15.	9S-4183	[1]	PLUG
	3D-2824	[1]	SEAL
	C		INDICATES CHANGE

#SEBP10790423

TRANSMISSION CASE REPLACEMENT

TRANSMISSION CASE REPLACEMENT
Provides Field Replacement of 7G7135 Case Assembly shown on Pages 126A & 126B

SEBP10790423 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Part No	Qty	Parts name
6P-8830	[1]	CASE ASSEMBLY
		INCLUDES:
1A-2223	[2]	DOWEL
9H-8751	[4]	BEARING
8M-4438	[2]	SEAL
3S-8313	[2]	PLUG
7G-7139	[1]	MANIFOLD ASSEMBLY
7F-2122	[2]	SEAL

#SEBP10790424

1V-4943: DRIVE SHAFT GP

DRIVE SHAFT GP

1V4943 MAIN DRIVE SHAFT GROUP
Serial No. 50W1 to 3211, 3227 to 50W3230 inclusive
1V2605 Drive Shaft and 4V2756, 4V2757, 4V2758 and 4V2759 Universal Joint parts
are shown on Pages 128, 130, 130A and 130B

c172106 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	9K-2816	[1]	JOINT GROUP
			(Includes)
	4V-2758 C	[1]	JOINT GROUP
			-OR-
	4V-2759 YC	[1]	JOINT GROUP
			(Separate Illustration)
2.	0L-1732	[12]	BOLT
3.	6B-6684	[16]	NUT
4.	0S-1604	[4]	BOLT
5.	9K-2815	[1]	JOINT GROUP
			(Includes)
	4V-2756 C	[1]	JOINT GROUP
			-OR-
	4V-2757 YC	[1]	JOINT GROUP
			(Separate Illustration)
6.	0L-1558	[4]	BOLT
7.	3K-9917	[1]	YOKE ASSEM.
			(Includes)
8.	3K-9608	[1]	GUARD
9.	3K-9604 C	[1]	CAGE
10.	1V-2605 Y	[1]	SHAFT GROUP
			(Separate Illustration)
11.	1D-4566	[6]	BOLT
	1D-4719	[6]	NUT
12.	2M-0849	[12]	WASHER
13.	7K-6432	[1]	RETAINER
14.	0S-1585	[9]	BOLT
15.	3B-8489	[1]	FITTING
16.	2S-0672	[1]	RETAINER
	2S-1378	[2]	SHIM PACK
17.	2H-2665	[1]	SEAL
18.	9F-1399	[1]	SEAL
19.	2D-8540	[2]	SEAL
20.	3K-9616	[1]	BEARING
21.	3S-0328	[1]	SHIM .051 mm(.002 in.) thick
	3S-0329	[1]	SHIM .076 mm(.003 in.) thick
	C		INDICATES CHANGE
	Y		SEPARATE ILLUSTRATION

#SEBP10790425

1V-4943: DRIVE SHAFT GP

DRIVE SHAFT GP

1V4943 MAIN DRIVE SHAFT GROUP
Serial No. 50W3212 to 3226 and 50W3231 to 50W3263 inclusive
5V621 Drive Shaft and 4V2756, 4V2757, 4V2758 and 4V2759 Universal
Joint parts are shown on Pages 128A, 130, 130A and 130B

c172096 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	9K-2816	[1]	JOINT GROUP
			(Includes)
	4V-2758	[1]	JOINT GROUP
			-OR-
	Y	[1]	JOINT GROUP
			(Separate Illustration)
2.	0L-1732	[12]	BOLT
3.	6B-6684	[16]	NUT
4.	0S-1599 C	[4]	BOLT
5.	9K-2815	[1]	JOINT GROUP
			(Includes)
	4V-2756	[1]	JOINT GROUP
			-OR-
	4V-2757 Y	[1]	JOINT GROUP
			(Separate Illustration)
6.	0L-1558	[4]	BOLT
7.	3K-9917	[1]	YOKE ASSEM.
			(Includes)
8.	3K-9608	[1]	GUARD
9.	3K-9604	[1]	CAGE
10.	5V-0621 YC	[1]	SHAFT GROUP
			(Separate Illustration)
11.	1D-4566	[6]	BOLT
	1D-4719	[6]	NUT
12.	2M-0849	[12]	WASHER
13.	7K-6432	[1]	RETAINER
14.	0S-1585	[9]	BOLT
15.	2D-4867 C	[1]	FITTING
16.	2S-0672	[1]	RETAINER
	2S-1378	[2]	SHIM PACK
17.	2H-2665	[1]	SEAL
18.	9F-1399	[1]	SEAL
19.	2D-8540	[2]	SEAL
20.	3K-9616	[1]	BEARING
21.	3S-0328	[1]	SHIM .051 mm(.002 in.) thick
	3S-0329	[1]	SHIM .076 mm(.003 in.) thick
22.	3H-7654	[20]	WASHER
	C		INDICATES CHANGE
	Y		SEPARATE ILLUSTRATION

#SEBP10790426

1V-4943: DRIVE SHAFT GP

DRIVE SHAFT GP

1V4943 MAIN DRIVE SHAFT GROUP
Serial No. 50W3264-Up
5V621 Drive Shaft and 5V622, 5V623, 4V2758 and 4V2759 Universal
Joint parts are shown on Pages 128A, 130-1, 130A-2 and 130B

c172097 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	9K-2816	[1]	JOINT GROUP
			(Includes)
	4V-2758	[1]	JOINT GROUP
			-OR-
	4V-2759 Y	[1]	JOINT GROUP
			(Separate Illustration)
2.	0L-1732	[12]	BOLT
3.	6B-6684	[16]	NUT
4.	0S-1599	[4]	BOLT
5.	5V-0619 C	[1]	JOINT GROUP
			(Includes)
	5V-0622	[1]	JOINT GROUP
			-OR-
	5V-0623 Y	[1]	JOINT GROUP
			(Separate Illustration)
6.	0L-1558	[4]	BOLT
7.	3K-9917	[1]	YOKE ASSEM.
			(Includes)
8.	3K-9608	[1]	GUARD
9.	3K-9604	[1]	CAGE
10.	5V-0621 Y	[1]	SHAFT GROUP
			(Separate Illustration)
11.	1D-4566	[6]	BOLT
	1D-4719	[6]	NUT
12.	2M-0849	[12]	WASHER
13.	7K-6432	[1]	RETAINER
14.	0S-1585	[9]	BOLT
15.	2D-4867	[1]	FITTING
16.	2S-0672	[1]	RETAINER
	2S-1378	[2]	SHIM PACK
17.	2H-2665	[1]	SEAL
18.	9F-1399	[1]	SEAL
19.	2D-8540	[2]	SEAL
20.	3K-9616	[1]	BEARING
21.	3S-0328	[1]	SHIM .051 mm(.002 in.) thick
	3S-0329	[1]	SHIM .076 mm(.003 in.) thick
22.	3H-7654	[20]	WASHER
	C		INDICATES CHANGE
	Y		SEPARATE ILLUSTRATION

#SEBP10790427

1V-4942: DRIVE SHAFT GP

DRIVE SHAFT GP

1V4942 UPPER DRIVE SHAFT GROUP
4V2761 and 4V2762 Joint parts are shown on Page 131

c166584 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	0S-0484	[8]	BOLT
	3H-7654	[8]	WASHER
2.	9K-2817	[1]	JOINT GROUP
			(Includes)
	4V-2761 CY	[1]	JOINT GROUP
			(Separate Illustration)
			-OR-
	4V-2762 CY	[1]	JOINT GROUP
			(Separate Illustration)
	C		INDICATES CHANGE
	Y		SEPARATE ILLUSTRATION

#SEBP10790428

1V-2605: DRIVE SHAFT GROUP

DRIVE SHAFT GROUP

1V2605 DRIVE SHAFT GROUP
Serial No. 50W1 to 3211, 3227 to 50W3230 inclusive. Part of 1V4943 Main Drive. Shaft
Group shown on Page 127, 4V2754 and 4V2755 Joint parts are shown on
Pages 129 and 129B

c166592 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	3K-9608	[1]	GUARD
2.	3K-9617	[1]	SPACER
3.	9K-2814	[1]	JOINT GROUP
			(Includes)
	4V-2754	[1]	JOINT ASSEM.
			-OR-
	4V-2755 Y	[1]	JOINT ASSEM.
			(Separate Illustration)
	Y		SEPARATE ILLUSTRATION

#SEBP10790429

5V-0621: DRIVE SHAFT GP

DRIVE SHAFT GP

5V621 DRIVE SHAFT GROUP
Serial No. 50W3212 to 3226 and 50W3231-Up. Part of 1V4943 Main Drive Shaft
Group shown on Pages 127A & 127B. 5V580 and 5V579 Joint parts are shown on
Pages 129A and 129D

c172098 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	3K-9608	[1]	GUARD
2.	3K-9617	[1]	SPACER
3.	5V-0620	[1]	JOINT GROUP
			(Includes)
	5V-0579 Y	[1]	JOINT ASSEM.
			(Separate Illustration)
			-OR-
	5V-0580 Y	[1]	JOINT ASSEM.
			(Separate Illustration)
	Y		SEPARATE ILLUSTRATION