4N1816 CYLINDER HEAD GROUP Engine Serial No. 48W13026-Up 7N857 Cylinder Head parts are shown on Page 11A-4 988B

BASIC ENGINE

CYLINDER HEAD GP

0. 4N-1816 CYLINDER H
1. 7N-0857 CYLINDER H
2. 4N-1710 CYLINDER H
3. 6N-9979 CYLINDER H
4. 6N-9979 CYLINDER H

VALVE MECHANISM GP

5. 4N-4298 VALVE MECH
6. 4N-1718 ROCKER ARM
7. 4N-1718 ROCKER ARM
8. 4N-1718 ROCKER ARM
9. 4N-9599 COVER GP-V
0. INFORMATION

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

BASIC ENGINE

CYLINDER HEAD GP

4N-1817 CYLINDER HEAD GP

4N-1816 CYLINDER HEAD GP

7N-0857 CYLINDER HEAD GP

4N-1710 CYLINDER HEAD GROUP

6N-9979 CYLINDER HEAD GP

#SEBP10790030

4N-1816: CYLINDER HEAD GP

CYLINDER HEAD GP

4N1816 CYLINDER HEAD GROUP
Engine Serial No. 48W13026-Up
7N857 Cylinder Head parts are shown on Page 11A-4

c237395 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	1W-7885 C	[8]	ADAPTER AS-FUEL VALVE
2.	2S-2251	[8]	SEAL-O-RING
3.	4N-7253	[8]	GASKET-CHAMBER
4.	5M-6214	[2]	PLUG-PIPE
5.	7N-0857 Y	[2]	CYLINDER HEAD GP
6.	0L-1352	[11]	BOLT
7.	3J-5390	[2]	PLUG
8.	3J-5389	[2]	PLUG
9.	1B-5174	[2]	PLUG-PIPE
10.	4S-6137	[16]	STUD-TAPERLOCK
11.	4N-1820	[2]	GASKET-CYLINDER HEAD
12.	2H-3750	[28]	BOLT
	5H-1504	[28]	WASHER-HARD
13.	4N-2269	[32]	SEAL-WATER
14.	5P-0063	[4]	PLUG-CUP
15.	4N-0932	[2]	PLUG-CUP
16.	1A-5183	[2]	BOLT
17.	5M-2894	[5]	WASHER
18.	5B-2638	[2]	BOLT
19.	6N-6731	[1]	SUPPORT-GEAR HSG (LH)
20.	6N-6732	[1]	SUPPORT-GEAR HSG (RH)
21.	2B-0858	[2]	PLUG-PIPE
22.	8S-9191	[3]	BOLT
23.	0S-1591	[2]	BOLT
24.	1W-5207 C	[1]	BRACKET-FUEL PUMP
25.	9N-2583	[1]	BRACKET-FUEL PUMP
	C		CHANGE FROM PREVIOUS TYPE
	Y		SEPARATE ILLUSTRATION

#SEBP10790031

7N-0857: CYLINDER HEAD GP

CYLINDER HEAD GP

7N857 CYLINDER HEAD GROUP
Engine Serial No. 48W13026-Up
Part of 4N1816 Cylinder Head Group shown on Page 11A-3

c234690 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	4N-5906	[16]	SPRING-VALVE
2.	6N-7175	[16]	ROTOCOIL AS
			(EACH INCLUDES)
3.	6N-7174	[1]	SHIELD-OIL
4.	7N-0858 R	[1]	CYLINDER HEAD AS
5.	4N-5893	[8]	INSERT-INLET
	4S-8898 A	[8]	INSERT .13MM(.005IN)OVERSIZE
	4S-8899 A	[8]	INSERT .26MM(.010IN)OVERSIZE
6.	9S-9699	[8]	INSERT-SEAT (EXHAUST)
	4S-8902 A	[8]	INSERT .13MM(.005IN)OVERSIZE
	4S-8903 A	[8]	INSERT .26MM(.010IN)OVERSIZE
7.	3B-0623	[8]	PLUG-CUP
8.	4N-2803	[16]	GUIDE-VALVE
9.	2N-5775	[8]	DOWEL
10.	3B-0645	[6]	PLUG-CUP
11.	4N-5654	[8]	VALVE-INLET
12.	7N-4580	[8]	VALVE-EXHAUST
13.	2A-4429	[32]	LOCK-RETAINER
	A		NOT PART OF THIS GROUP
	R		REMFG PART MAY BE AVAILABLE

#SEBP10790032

4N-1710: CYLINDER HEAD GROUP

CYLINDER HEAD GROUP

4N1710 CYLINDER HEAD GROUP
Engine Serial No. 48W1 to 48W948 inclusive
Part of 4N1817 Cylinder Head Group shown on Page 11

c176666 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	4N-5906	[16]	SPRING
2.	6N-7175 C	[16]	ROTOCOIL ASSEM.
			(Each Includes)
3.	6N-7174	[1]	SHIELD
4.	4N-7799	[1]	HEAD ASSEM.
			(Includes)
5.	4N-5893	[8]	INSERT (intake)
	4S-8898 H	[8]	INSERT .13mm(.005 in.)oversize
	4S-8899 H	[8]	INSERT .26mm(.010 in.)oversize
6.	9S-9699	[8]	INSERT (exhaust)
	4S-8902 H	[8]	INSERT .13mm(.005 in.)oversize
	4S-8903 H	[8]	INSERT .26mm(.010 in.)oversize
7.	3B-0623	[8]	PLUG
8.	4N-2803	[16]	GUIDE
9.	2N-5775	[8]	DOWEL
10.	3B-0645	[6]	PLUG
11.	4N-5654	[8]	VALVE (intake)
12.	4N-5653	[8]	VALVE (exhaust)
13.	2A-4429	[32]	LOCK
	C		INDICATES CHANGE
	H		NOT PART OF 4N1710 GROUP

#SEBP10790033

6N-9979: CYLINDER HEAD GP

CYLINDER HEAD GP

6N9979 CYLINDER HEAD GROUP
Engine Serial No. 48W949 to 48W2279 inclusive
Part of 4N1817 Cylinder Head Group shown on Page 11A

c176662 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	4N-5906	[16]	SPRING
2.	6N-7175	[16]	ROTOCOIL ASSEM.
			(Each Includes)
3.	6N-7174 C	[1]	SHIELD
4.	6N-9978	[1]	HEAD ASSEM.
			(Includes)
5.	4N-5893	[8]	INSERT (intake)
	4S-8898 H	[8]	INSERT .13mm(.005 in.)oversize
	4S-8899 H	[8]	INSERT .26mm(.010 in.)oversize
6.	9S-9699	[8]	INSERT (exhaust)
	4S-8902 H	[8]	INSERT .13mm(.005 in.)oversize
	4S-8903 H	[8]	INSERT .26mm(.010in.)oversize
7.	3B-0623	[8]	PLUG
8.	4N-2803	[16]	GUIDE
9.	2N-5775	[8]	DOWEL
10.	3B-0645	[6]	PLUG
11.	4N-5654	[8]	VALVE (intake)
12.	7N-2271 C	[8]	VALVE (exhaust)
13.	2A-4429	[32]	LOCK
	C		INDICATES CHANGE
	H		NOT PART OF 6N9979 GROUP

#SEBP10790034

6N-9979: CYLINDER HEAD GP

CYLINDER HEAD GP

6N9979 CYLINDER HEAD GROUP
Engine Serial No. 48W2280 to 48W13025 inclusive
Part of 4N1817 & 4N1816 Cylinder Head Group shown on Pages 11A, 11A-1 and 11A-2

c176663 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	4N-5906	[16]	SPRING
2.	6N-7175	[16]	ROTOCOIL ASSEM.
			(Each Includes)
3.	6N-7174 C	[1]	SHIELD
4.	6N-9978	[1]	HEAD ASSEM.
			(Includes)
5.	4N-5893	[8]	INSERT (intake)
	4S-8898 H	[8]	INSERT .13mm(.005 in.)oversize
	4S-8899 H	[8]	INSERT .26mm(.010in.)oversize)
6.	9S-9699	[8]	INSERT (exhaust)
	4S-8902 H	[8]	INSERT .13 mm(.005 in.)oversize
	4S-8903 H	[8]	INSERT .26mm(.010in.)oversize
7.	3B-0623	[8]	PLUG
8.	4N-2803	[16]	GUIDE
9.	2N-5775	[8]	DOWEL
10.	3B-0645	[6]	PLUG
11.	4N-5654	[8]	VALVE (intake)
12.	7N-4580 C	[8]	VALVE (exhaust)
13.	2A-4429	[32]	LOCK
	C		INDICATES CHANGE
	H		NOT PART OF 6N9979 GROUP

#SEBP10790035

4N-4298: VALVE MECHANISM GP

VALVE MECHANISM GP

4N4298 VALVE MECHANISM GROUP
4N1718 Rocker Arm parts are shown on Pages 13 and 13B

c932268 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	Y	[2]	ROCKER ARM
			(Separate Illustration)
2.	4N-5611	[8]	BRIDGE ASSEM. (exhaust)
			(Each Includes)
3.	2N-5842	[1]	SCREW
	9L-7712	[1]	NUT
4.	2P-9845	[8]	BOLT
	5H-1504	[8]	WASHER
5.	4N-5609	[16]	ROD
6.	6N-6872	[16]	SPRING
7.	6N-4589 R	[16]	LIFTER ASSEM.
8.	4N-5612	[8]	BRIDGE ASSEM. (intake)
			(Each Includes)
9.	2N-5842	[1]	SCREW
	9L-7712	[1]	NUT
	R		REMFG PART MAY BE AVAILABLE
	Y		SEPARATE ILLUSTRATION

#SEBP10790036

4N-1718: ROCKER ARM GP

ROCKER ARM GP

4N1718 ROCKER ARM GROUP
Engine Serial No. 48W1 to 48W948 inclusive
Part of 4N4298 Valve Mechanism Group

c932269 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	006-7403	[1]	RETAINER
2.	2N-7228	[4]	WASHER
3.	4N-0955	[2]	PIN
4.	2N-7229	[3]	SPRING
5.	4N-1106	[1]	SHAFT ASSEM.
			(Includes)
6.	5B-1866	[2]	PLUG
7.	4N-0833	[4]	BRACKET
8.	4N-5614	[8]	ARM ASSEM.
9.	1A-2935	[8]	SCREW
10.	9L-7712	[8]	NUT

#SEBP10790037

4N-1718: ROCKER ARM GP

ROCKER ARM GP

4N1718 ROCKER ARM GROUP
Engine Serial No. 48W949 to 48W1143 inclusive
Part of 4N4298 Valve Mechanism Group shown on Page 13

c163051 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	006-7403	[1]	RETAINER
2.	2N-7228	[4]	WASHER
3.	4N-0955	[2]	PIN
4.	2N-7229	[3]	SPRING
5.	4N-1106	[1]	SHAFT ASSEM.
			(Includes)
6.	5B-1866	[2]	PLUG
7.	7N-0839 C	[2]	BRACKET ASSEM.
8.	4N-5614	[8]	ARM ASSEM.
9.	1A-2935	[8]	SCREW
10.	9L-7712	[8]	NUT
11.	4N-0833 C	[2]	BRACKET
	C		INDICATES CHANGE

#SEBP10790038

4N-1718: ROCKER ARM GP

ROCKER ARM GP

4N1718 ROCKER ARM GROUP
Engine Serial No. 48W1144-Up
Part of 4N4298 Valve Mechanism Group shown on Page 13

c234687 SEBP1079

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	006-7403 C	[2]	RING-RETAINING
2.	2N-7228	[4]	WASHER
3.	4N-0955	[2]	PIN-DOWEL
4.	2N-7229	[3]	SPRING
5.	4N-1106	[1]	SHAFT AS-ROCKER
6.	0L-1022 C	[2]	PLUG-CUP
7.	7N-1198 C	[3]	BRACKET-ROCKER ARM SHAFT
8.	4N-5614	[8]	ARM AS-ROCKER
9.	1A-2935	[8]	SCREW-ROCKER ADJUSTABLE
10.	9L-7712	[8]	NUT
11.	7N-0839 C	[1]	BRACKET AS
12.	2D-6642 C	[2]	BALL 6.35MM(.25IN.)DIA.
			-OR-
	2D-6642 C	[1]	BALL 6.35MM(.25IN.)DIA.
	4B-9880 C	[1]	BALL 7.93MM(.312IN.)DIA.
	C		CHANGE FROM PREVIOUS TYPE

#SEBP10790039

4N-9599: COVER GP-VALVE MECHANISM

COVER GP-VALVE MECHANISM

4N9599 VALVE MECHANISM COVER GROUP--R.H. and L.H.

c167470 SEBP1079

4N9599 COVER GP-VALVE MECHANISM Parts scheme

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Parts for your 988B WHEEL LOADER:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	5P-5678 CDB		SEAL 7.22 m(284.50 in.)
2.	9L-8925	[40]	BOLT
3.	6N-2522	[2]	BASE
4.	7M-1599	[8]	STUD
5.	6N-2438	[2]	COVER
6.	4N-0851	[2]	ADAPTER
7.	4N-4957 C	[2]	PLUG
	C		INDICATES CHANGE
	D		ORDER BY THE METRE
	B		USE AS REQUIRED