1V4909 STEERING MECHANISM CONTROL GROUP Serial No. 50W1 to 50W1844 inclusive 8J429 Metering Pump parts are shown on Page 175 988B

OPERATOR STATION

CONTROL GP-STEERING

0. 1V-4909 CONTROL GP
1. 1V-4909 CONTROL GP
2. 1V-4909 CONTROL GP

STEERING SYSTEM

PUMP GP-METERING

3. 8J-0429 METERING P
4. 3G-7595 PUMP GP-ME

OPERATOR STATION

CONTROL GP-STEERING

5. 1V-4917 CONTROL GP
6. 1V-4917 CONTROL GP

STEERING SYSTEM

LINES GP

7. 8J-1553 VALVE GP-N

BRAKING SYSTEM

VALVE GP

8. 9J-8225 VALVE GP

STEERING SYSTEM

VALVE GP

9. 8J-2318 VALVE GP-S
0. INFORMATION

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

OPERATOR STATION

CONTROL GP-STEERING

1V-4909 CONTROL GP-STEERING

1V-4917 CONTROL GP-STEERING

#SEBP10790570

1V-4909: CONTROL GP-STEERING

CONTROL GP-STEERING

1V4909 STEERING MECHANISM CONTROL GROUP
Serial No. 50W1 to 50W1844 inclusive
8J429 Metering Pump parts are shown on Page 175

c217919 SEBP1079

For full view, you need register

Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	1V-6282	[1]	SPINNER ASSEM.
2.	1V-9385	[1]	COVER
3.	9K-5635	[3]	SCREW
4.	032-5678	[1]	WHEEL
5.	1S-6106	[1]	RING
6.	6K-8161	[1]	BEARING
7.	5H-6480	[1]	RING
8.	0S-1588	[4]	BOLT
	3B-4506	[4]	LOCKWASHER
9.	2R-6806	[2]	CONNECTOR
10.	3J-1907	[4]	SEAL
11.	030-7947	[2]	ELBOW
12.	2V-3219	[2]	HOSE ASSEM. 65.60 cm(25.82 in.)
13.	3V-5648 C	[1]	HOSE ASSEM. (not service)
			For Service of Each Furnish:)
	5P-0178 H		HOSE 48 cm(18.89 in.)
	8S-6417	[2]	COUPLING ASSEM.
	4S-5414	[2]	SLEEVE
14.	2P-1278	[4]	UNION
15.	2P-1279	[4]	LOCKNUT
16.	2V-3221	[1]	HOSE ASSEM. 56.8 cm(22.36 in.)
17.	8J-0429 Y	[1]	PUMP GROUP
			(Separate Illustration)
18.	1V-6349	[1]	SHAFT ASSEM.
			(Includes)
19.	9K-5636	[1]	BEARING
20.	9S-1354	[1]	NUT
	6F-0253	[1]	LOCKWASHER
	4B-4281	[1]	WASHER
	C		INDICATES CHANGE
	Y		SEPARATE ILLUSTRATION
	H		ORDER BY THE CENTIMETRE

#SEBP10790571

1V-4909: CONTROL GP-STEERING

CONTROL GP-STEERING

1V4909 STEERING MECHANISM CONTROL GROUP
Serial No. 50W1845 to 50W2339 inclusive
8J429 Metering Pump parts are shown on Page 175

c216481 SEBP1079

For full view, you need register

Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	1V-6282	[1]	SPINNER ASSEM.
2.	1V-9385	[1]	COVER
3.	9K-5635	[3]	SCREW
4.	032-5678	[1]	WHEEL
5.	1S-6106	[1]	RING
6.	6K-8161	[1]	BEARING
7.	5H-6480	[1]	RING
8.	0S-1588	[4]	BOLT
	3B-4506	[4]	LOCKWASHER
9.	2R-6806 C	[1]	CONNECTOR
10.	3J-1907	[4]	SEAL
11.	030-7947 C	[3]	ELBOW
12.	2V-3219 C	[1]	HOSE ASSEM. 65.60 cm(25.82 in.)
13.	3V-5648	[2]	HOSE ASSEM. (not service)
			For service of each furnish:
	5P-0178 H		HOSE 48 cm(18.89 in.)
	8S-6417	[2]	COUPLING ASSEM.
	4S-5414	[2]	SLEEVE
14.	2P-1278	[4]	UNION
15.	2P-1279	[4]	LOCKNUT
16.	4V-6133 C	[1]	HOSE ASSEM. (not service)
			For service furnish:
	5P-0178 H		HOSE 57.7 cm(22.71 in.)
	1P-9919	[1]	COUPLING ASSEM. (45 degrees)
	8S-6417	[1]	COUPLING ASSEM. (straight)
	4S-5414	[2]	SLEEVE
17.	8J-0429 Y	[1]	PUMP GROUP
			(Separate Illustration)
18.	1V-6349	[1]	SHAFT ASSEM.
			(Includes)
19.	9K-5636	[1]	BEARING
20.	9S-1354	[1]	NUT
	6F-0253	[1]	LOCKWASHER
	4B-4281	[1]	WASHER
	H		ORDER BY THE CENTIMETRE
	Y		SEPARATE ILLUSTRATION
	C		INDICATES CHANGE

#SEBP10790572

1V-4909: CONTROL GP-STEERING

CONTROL GP-STEERING

1V4909 STEERING MECHANISM CONTROL GROUP
Serial No. 50W2340-Up
3G7595 Pump parts are shown on Page 175B

c172006 SEBP1079

For full view, you need register

Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	1V-6282	[1]	SPINNER AS
2.	1V-9385	[1]	COVER-EMBLEM
3.	9K-5635	[3]	SCREW-HEAD TAPPING
4.	032-5678	[1]	WHEEL-HAND STEERING
5.	1S-6106	[1]	RING-SNAP
6.	6K-8161	[1]	BALL BEARING
7.	5H-6480	[1]	RING-RETAINING
8.	0S-1588	[4]	BOLT
	3B-4506	[4]	LOCKWASHER
9.	2R-6806	[1]	CONNECTOR
10.	3J-1907	[4]	SEAL
11.	030-7947	[3]	ELBOW
12.	2V-3219 I	[1]	HOSE AS 65.6CM(25.82IN)
13.	Z	[1]	HOSE AS
	2P-5943 CG		HOSE 18.89IN(48CM)
	8S-6417	[2]	COUPLING AS
	4S-5414	[2]	SLEEVE
14.	2P-1278	[4]	UNION-BULKHEAD
15.	2P-1279	[4]	LOCKNUT
16.	Z	[1]	HOSE AS
	2P-5943 CG		HOSE 22.71IN(57.7CM)
	1P-9919	[1]	COUPLING AS (45 DEG)
	8S-6417	[1]	COUPLING AS (STRAIGHT)
	4S-5414	[2]	SLEEVE
17.	3G-7595 CY	[1]	PUMP GP-METERING
18.	1V-6349	[1]	SHAFT AS
19.	9K-5636	[1]	BALL BEARING
20.	9S-1354	[1]	NUT
	6F-0253	[1]	LOCKWASHER
	4B-4281	[1]	WASHER
	C		CHANGE FROM PREVIOUS TYPE
	G		ORDER BY THE INCH
	I		SEE HOSE FABRICATION GUIDE
	Y		SEPARATE ILLUSTRATION
	Z		NOT SERVICED SEPARATELY

#SEBP10790573

8J-0429: METERING PUMP GROUP

METERING PUMP GROUP

8J429 METERING PUMP GROUP
Serial No. 50W1 to 50W2339 inclusive
Part of 1V4909 Steering Mechanism Control Group shown on Page 174

c216559 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	9J-8076	[1]	BUSHING
2.	8F-5340	[1]	SEAL
3.	7J-6833	[1]	SEAL
4.	6S-7808	[2]	RACE
5.	5L-1100	[1]	BEARING
6.	6S-8149	[1]	PLATE
7.	9J-5444	[1]	GEAR SET
8.	9J-5443	[7]	BOLT
9.	6S-8146	[1]	CAP
10.	3G-3458 C	[1]	SPACER
11.	7J-6839	[1]	DRIVE
12.	9J-5445	[1]	BODY ASSEM.
			(Includes)
13.	2D-6642	[1]	BALL
14.	6S-8144	[1]	RETAINER
15.	6S-8143	[1]	INSERT
16.	7J-8009	[1]	PIN
17.	7J-8010	[6]	SPRING
18.	7F-8267	[1]	SEAL
19.	9J-5442	[1]	RING
	C		INDICATES CHANGE

#SEBP10790574

3G-7595: PUMP GP-METERING

PUMP GP-METERING

3G7595 METERING PUMP GROUP
Serial No. 50W2340-Up
Part of 1V4909 Steering Mechanism Control Group shown on Page 174B

c172007 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	3G-8994	[1]	BODY AS
2.	7J-8010	[6]	SPRING-CENTERING
3.	7J-8009	[1]	PIN
4.	3G-6906	[1]	SCREW
5.	1H-1023	[1]	SEAL-O-RING
6.	3G-6907	[1]	SEAT
7.	5F-9144	[1]	SEAL-O-RING
8.	6S-7827	[1]	BALL
9.	6S-7826	[1]	RETAINER-BALL
10.	9J-5686	[3]	SEAL-O-RING
11.	9J-5443	[7]	BOLT-HEAD
12.	3G-3458	[1]	SPACER
13.	3G-6889	[1]	CAP
14.	3G-8997	[1]	GEROTOR AS
15.	3G-6905	[1]	SPACER
16.	7J-6839	[1]	DRIVE-CONTROL END
17.	3G-6891	[2]	RACE
18.	5L-1100	[1]	BEARING-THRUST
19.	7F-8267	[1]	SEAL-O-RING
20.	9J-5442	[1]	RING
21.	7J-6833	[1]	SEAL
22.	9J-8076	[1]	BUSHING
23.	8F-5340	[1]	SEAL-LIP TYPE

#SEBP10790575

1V-4917: CONTROL GP-STEERING

CONTROL GP-STEERING

1V4917 STEERING CONTROL GROUP--Part 1
8J1553 Valve parts are shown on Page 178

c180550 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	2V-9346	[1]	TUBE ASSEM.
2.	9S-1310	[2]	CLIP
3.	4F-4879	[2]	BOLT
4.	5P-1075	[8]	WASHER
5.	5M-2894 C	[2]	ELBOW
6.	3J-1907	[7]	SEAL
7.	2R-6806	[4]	CONNECTOR
8.	2V-9301	[2]	HOSE ASSEM.
			(Each Includes)
	5P-0178 H		HOSE 71 cm(27.95 in.)
9.	8S-6393	[1]	COUPLING ASSEM. 90 DEGREES
10.	4S-5414	[2]	SLEEVE
11.	8S-6417	[1]	COUPLING ASSEM. (straight)
12.	9K-8025	[2]	STUD ASSEM.
			(Each Includes)
	2H-2722	[1]	BOSS
13.	1D-5117	[2]	NUT
14.	5B-0213	[6]	BOLT
	3B-4506	[6]	LOCKWASHER
15.	8J-1553 Y	[2]	VALVE GROUP
			(Separate Illustration)
16.	030-6816	[1]	ELBOW
17.	1J-9671	[2]	SEAL
18.	2V-9348	[1]	TUBE ASSEM.
19.	0S-1594	[4]	BOLT
20.	1V-7944	[1]	PLATE ASSEM.
21.	2V-9302	[1]	HOSE ASSEM.
			( Includes)
	5P-0178 H		HOSE 92 cm(36.22 in.)
22.	8S-6417	[1]	COUPLING ASSEM. (straight)
23.	4S-5414	[2]	SLEEVE
24.	8S-6393	[1]	COUPLING ASSEM. 90 DEGREES
25.	0S-1590	[2]	BOLT
26.	2V-7777	[1]	BLOCK
27.	5P-0419	[1]	CONNECTOR
28.	2V-9347	[1]	TUBE ASSEM.
29.	031-6281	[1]	TEE
	H		ORDER BY THE CENTIMETER
	Y		SEPARATE ILLUSTRATION
	C		INDICATES CHANGE

#SEBP10790576

1V-4917: CONTROL GP-STEERING

CONTROL GP-STEERING

1V4917 STEERING CONTROL GROUP--Part 2
8J2318 Valve parts are shown on Page 179

c238073 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	2V-9298 C	[2]	HOSE ASSEM.
			(Each Includes)
	2P-5943 CH		HOSE 69.44 in.(176.4 cm)
2.	8S-6417	[1]	COUPLING ASSEM. (straight)
3.		[2]	SLEEVE
4.	8S-6393	[1]	COUPLING ASSEM. (90)
5.	2V-9299	[1]	HOSE ASSEM.
			(Includes)
	2P-5943 CH		HOSE 75.197 in.(191 cm)
	4S-5414	[2]	SLEEVE
	8S-6417	[2]	COUPLING ASSEM. (straight)
6.	3V-0778	[1]	BRACKET
7.		[1]	BOLT
8.	5M-2894 C	[2]	WASHER
9.	0S-0509	[1]	BOLT
10.	1D-4717	[2]	NUT
11.	1S-1015 C	[1]	CLIP
12.	7D-0874	[4]	TIE
13.	4K-6297	[1]	ELBOW
14.	2V-9345	[1]	TUBE ASSEM.
15.	6K-3607	[1]	CONNECTOR
16.	2M-9780	[1]	SEAL
17.	030-7947	[4]	ELBOW
18.	3J-1907 C	[6]	SEAL
19.	3V-5480	[1]	TUBE ASSEM.
20.	2R-6806	[1]	CONNECTOR
21.	6H-1717	[4]	BOLT
22.	3B-4508	[7]	LOCKWASHER
	4B-4280	[7]	WASHER
23.	1V-8976	[1]	BRACKET ASSEM.
			(Includes)
	3R-0451 C	[1]	BOSS
24.	8F-8804	[1]	BOLT
25.	1D-4719	[3]	NUT
26.	2H-6488	[2]	BOLT
27.	8J-2318 Y	[1]	VALVE GROUP
			(Separate Illustration)
28.	0S-1594 C	[1]	BOLT
29.	5P-5303	[2]	CLAMP
30.	9M-6527 C	[2]	WASHER
	C		INDICATES CHANGE
	Y		SEPARATE ILLUSTRATION
	H		ORDER BY THE INCH

#SEBP10790577

8J-1553: VALVE GP-NEUTRALIZER

VALVE GP-NEUTRALIZER

8J1553 NEUTRALIZER VALVE GROUP
Part of 1V4917 Steering Control Group shown on Page 176

c210320 SEBP1079

8J1553 VALVE GP-NEUTRALIZER Parts scheme

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	6J-0463	[1]	BOOT
2.	9S-6155	[1]	PLUG ASSEM.
	1J-9671	[1]	SEAL
3.	1A-8096	[1]	SPRING
4.	4B-9782	[1]	BALL
5.	7B-8194	[1]	SPRING
6.	9J-0477	[1]	PLUG
	4K-1388	[1]	SEAL
7.	8J-1552	[1]	VALVE GROUP
			(Includes)
8.	3J-4407	[1]	SEAL
9.	6J-4608	[1]	BOLT
	3B-4505	[1]	LOCKWASHER
	6B-6122	[1]	WASHER

#SEBP10790578

9J-8225: VALVE GP

VALVE GP

9J8225 PILOT RELIEF VALVE GROUP
Part of 8J2318 Steering Valve Group shown on Page 179

c208299 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name	Comments
1.	1J-8497	[1]	VALVE
2.	6J-0428	[1]	SEAT-PILOT

#SEBP10790579

8J-2318: VALVE GP-STEERING

VALVE GP-STEERING

8J2318 STEERING VALVE GROUP
Part of 1V4917 Steering Control Group shown on Page 177
9J8225 and 8J3667 Valve parts are shown on Pages 178 and 180

c209700 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	2B-0947	[3]	BOLT
2.	3B-4508	[9]	LOCKWASHER
3.	8J-3664	[1]	COVER
	4J-0526	[1]	SEAL
4.	8J-3659	[1]	STOP ASSEM.
	2S-4078	[1]	SEAL
5.	9S-6154	[1]	PLUG ASSEM.
			(Includes)
	5H-3193	[1]	PIN
6.	3J-1907	[1]	SEAL
7.	9H-2367	[1]	SPRING
8.	4B-9782	[1]	BALL
9.	1P-4579	[6]	FLANGE
10.	0S-1585	[12]	BOLT
	4B-4280	[12]	WASHER
11.	8J-2635	[1]	SPRING (outer)
12.	4J-5309	[4]	SEAL
13.	9S-8001	[3]	PLUG
	4J-7533	[3]	SEAL
14.	4J-0524	[1]	SEAL
15.	8J-2634	[1]	SPRING (inner)
16.	4F-7115	[1]	SPRING
17.	9S-4187	[1]	PLUG
	3K-0360	[1]	SEAL
	3J-7473	[1]	SHIM .127 mm(.005 in.) thick
	3H-2549	[7]	SHIM .254 mm(.010 in.) thick
18.	9J-8225 Y	[1]	VALVE GROUP
			(Separate Illustration)
19.	4J-0528	[2]	SEAL
20.	1B-2886	[6]	BOLT
21.	8J-3665	[1]	COVER
22.	8J-3667 Y	[1]	VALVE GROUP
			(Separate Illustration)
23.	9S-8008	[1]	PLUG
	3D-2824	[1]	SEAL
	Y		SEPARATE ILLUSTRATION