3H3171 AIR MOTOR--S.A.E. Standard Engine Rotation Part of 6L6731 Motor Assembly shown on Page 80 D399

ELECTRICAL AND STARTING SYSTEM

STARTING MOTOR GP

0. 3H-3171 LUG
1. 3H-3170 MOTOR GP-A
2. 6F-7691 AIR RECEIV
3. 7L-6912 SILENCER G
4. 3N-9492 SILENCER G
5. 3N-9492 SILENCER G
6. 5N-8762 SILENCER G

AIR INLET AND EXHAUST SYSTEM

LINES GP-AIR

7. 5N-8642 LINES GP-A
8. 2W-7127 LINES GP-A
9. 2W-7128 LINES GP-A
0. INFORMATION

INDUSTRIAL ENGINE D399 INDUSTRIAL ENGINE 35B
D399 INDUSTRIAL ENGINE 35B00688-UP UEG0637S D399 35B (1967)

ELECTRICAL AND STARTING SYSTEM

STARTING MOTOR GP

7C-4215 STARTING MOTOR GP-AIR

3L-9922 VALVE GP-WHISTLE

3H-3171 LUG

3H-3170 MOTOR GP-AIR STARTING

6F-7691 AIR RECEIVER GP

7L-6912 SILENCER GP-AIR STARTING

#UEG0637S0530

3H-3171: LUG

LUG

3H3171 AIR MOTOR--S.A.E. Standard Engine Rotation
Part of 6L6731 Motor Assembly shown on Page 80

c132941 UEG0637S

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Parts for your D399 INDUSTRIAL ENGINE:

CATERPILLAR SIS

Part No	Qty	Parts name
7L-7465	[5]	VANE
7F-5143	[1]	ROTOR
7F-5136	[1]	PLATE ASSEM.
7F-5138	[1]	DOWEL (437" THICK)
7F-5139	[1]	DOWEL (.50" THICK)
2F-4547	[2]	DOWEL (.25" DIA.)
		(PARTS OF PLATE ASSEM. 7F5136)
3H-1660	[2]	RING
7F-5421	[2]	SHIM (.002" THICK)
7F-5422	[2]	SHIM (.003" THICK)
7F-5423	[1]	SHIM (.005" THICK)
4B-4731	[1]	BEARING
7F-5154	[1]	NUT
7F-5155	[1]	LOCKWASHER
7F-5156	[1]	GASKET
7F-9504	[3]	PLUG
2B-2695	[4]	BOLT
3B-4505	[4]	LOCKWASHER
2L-6221	[1]	COVER
4B-3388	[8]	BOLT
3B-4505	[8]	LOCKWASHER
2N-7608	[1]	HOUSING
2N-7609	[1]	BEARING
2L-6220	[1]	HOUSING
007-5157	[1]	GASKET
7F-5164	[7]	BOLT
3B-4505	[7]	LOCKWASHER
6L-6705	[1]	COVER
0S-1614	[3]	BOLT
3B-4504	[3]	LOCKWASHER
7F-5158	[1]	PLATE
1B-8710	[2]	KEY
7F-5151	[1]	SHAFT
7F-5153	[1]	BEARING
7F-5149	[1]	GEAR
7F-5162	[1]	NUT
7F-5161	[1]	LOCKWASHER
7F-5152	[1]	RING
7F-5154	[1]	NUT
7F-5155	[1]	LOCKWASHER
7F-5148	[1]	GEAR
5B-1975	[1]	BEARING ASSEM.
5B-1974	[1]	RACE
7F-5141	[1]	PLATE ASSEM.
7F-5138	[1]	DOWEL (.437" DIA.)
7F-5139	[1]	DOWEL (.50" DIA.)
2F-4547	[2]	DOWEL (.25" DIA.)
		(PARTS OF PLATE ASSEM. 7F5141)
1B-2719	[8]	BOLT
3B-4505	[8]	LOCKWASHER
7F-5160	[1]	GASKET

#UEG0637S0531

3H-3170: MOTOR GP-AIR STARTING

MOTOR GP-AIR STARTING

3H3170 AIR MOTOR--S.A.E. Opposite Standard Engine Rotation
Part of 6L6730 Motor Assembly shown on Page 80

c104613 UEG0637S

3H3170 MOTOR GP-AIR STARTING Parts scheme

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Parts for your D399 INDUSTRIAL ENGINE:

CATERPILLAR SIS

Part No	Qty	Parts name
2L-6220	[1]	HOUSING
2F-0808	[4]	SCREW
7F-5143	[1]	ROTOR
7L-7465	[5]	VANE
7F-5136	[1]	PLATE ASSEM.
7F-5138	[1]	DOWEL (.43" DIA.)
7F-5139	[1]	DOWEL (50" DIA.)
2F-4547	[4]	PIN (.25" DIA.)
		(PARTS OF PLATE ASSEM. 7F5136)
3H-1660	[1]	RING
4B-4731	[1]	BEARING
7F-9504	[3]	PLUG (D)
7F-5154	[1]	NUT
7F-5155	[1]	LOCKWASHER
7F-5421	[2]	SHIM (.002")
7F-5422	[2]	SHIM (.003")
7F-5423	[1]	SHIM (.005")
2B-2695	[4]	BOLT
3B-4505	[4]	LOCKWASHER
2L-6221	[1]	COVER
7F-5156	[1]	GASKET
4B-3388	[8]	BOLT
3B-4505	[8]	LOCKWASHER
7F-5149	[1]	GEAR
7F-6284	[1]	RACE
7F-6283	[1]	BEARING ASSEM.
7F-5157	[1]	GASKET
6L-6705	[1]	COVER
7F-5164	[7]	BOLT
3B-4505	[7]	LOCKWASHER
7F-5158	[1]	PLATE
0S-1614	[3]	BOLT
3B-4504	[3]	LOCKWASHER
7F-5153	[1]	BEARING
1B-8710	[2]	KEY
7F-5151	[1]	SHAFT
7F-5162	[1]	NUT
7F-5161	[1]	LOCKWASHER
7F-5159	[1]	RING
7F-5171	[1]	WASHER
7F-5154	[1]	NUT
7F-5155	[1]	LOCKWASHER
5B-1975	[1]	BEARING ASSEM.
7F-5152	[1]	RING
7F-5148	[1]	GEAR
5B-1974	[1]	RACE
3H-1660	[1]	RING
7F-5160	[1]	GASKET
7F-5141	[1]	PLATE ASSEM.
7F-5138	[1]	DOWEL (.43" DIA.)
7F-5139	[1]	DOWEL (50" DIA.)
2F-4547	[4]	PIN (.25" DIA.)
		(PARTS OF PLATE ASSEM. 7F5141)
1B-2719	[6]	BOLT
3B-4505	[8]	LOCKWASHER
7F-5145	[1]	HOUSING

#UEG0637S0532

6F-7691: AIR RECEIVER GP

AIR RECEIVER GP

6F7691 AIR RECEIVER GROUP--28 Cubic Foot Capacity

c58420 UEG0637S

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Parts for your D399 INDUSTRIAL ENGINE:

CATERPILLAR SIS

Part No	Qty	Parts name
6F-7731	[1]	GAUGE
6F-7732	[1]	BUSHING
6F-7701	[1]	TEE
7F-6923	[1]	BUSHING
6F-7699	[1]	BUSHING
6F-7702	[1]	VALVE
7F-6654	[1]	NIPPLE
3L-2877	[1]	DISC
		(PART OF VALVE 1L7805)
6F-7692	[1]	AIR RECEIVER
1L-7805	[1]	VALVE
9B-3523	[1]	BUSHING
6F-6045	[2]	NIPPLE
6F-7694	[1]	COCK

#UEG0637S0533

7L-6912: SILENCER GP-AIR STARTING

SILENCER GP-AIR STARTING

7L6912 AIR SILENCER AND VAPOR ARRESTER GROUP
FOR USE WITH AIR STARTING MOTOR GROUPS
Replaced by 3N9492 shown on Page 84A

c104941 UEG0637S

7L6912 SILENCER GP-AIR STARTING Parts scheme

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Parts for your D399 INDUSTRIAL ENGINE:

CATERPILLAR SIS

Pos.	Qty	Parts name
1.	[1]	SILENCER
2.	[1]	GASKET
3.	[1]	ELBOW
4.	[2]	BOLT (3.25" Long)
5.	[4]	LOCKWASHER
6.	[2]	BOLT (1.25" Long)
7.	[1]	GASKET
8.	[4]	BOLT
9.	[4]	LOCKWASHER
10.	[1]	JAR
11.	[1]	RING

#UEG0637S0534

3N-9492: SILENCER GP-AIR STARTING

SILENCER GP-AIR STARTING

3N9492 AIR STARTING SILENCER GROUP--Type 1
FOR USE WITH 3N9570, 3N9571, 3N9572, 3N9573, 3N9568, 3N9569, 3N9574 AND 3N9575 AIR STARTING MOTOR GROUPS

c156562 UEG0637S

3N9492 SILENCER GP-AIR STARTING Parts scheme

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Parts for your D399 INDUSTRIAL ENGINE:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	1H-4725	[1]	SILENCER
2.	0L-0478	[1]	BOLT
	1B-4203	[1]	NUT
	5M-2894	[1]	WASHER
	1H-0767	[1]	SPACER
3.	3B-4506	[7]	LOCKWASHER
4.	5N-2595	[1]	BRACKET
5.	1A-2029	[2]	BOLT
	4B-1040	[8]	WASHER
6.	5N-2596	[1]	BRACKET
7.	0S-1625	[2]	BOLT
	3B-4510	[2]	LOCKWASHER
	8D-1251	[2]	SPACER
8.	3B-7296	[1]	NIPPLE
9.	3B-6500	[1]	ELBOW
10.	3N-9382	[1]	PIPE
11.	0S-1571	[4]	BOLT
12.	3N-9309	[1]	FLANGE
13.	1H-4768	[1]	GASKET
14.	5F-6658	[1]	JAR
15.	7H-2444	[1]	SEAL
16.	2L-3658	[1]	STRAP
	8F-3273	[1]	LINING

#UEG0637S0535

3N-9492: SILENCER GP-AIR STARTING

SILENCER GP-AIR STARTING

3N9492 AIR STARTING SILENCER GROUP--Type 2
FOR USE WITH 3N9570, 3N9571, 3N9572, 3N9573, 3N9568, 3N9569, 3N9574
AND 3N9575 AIR STARTING MOTOR GROUPS

c229543 UEG0637S

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Parts for your D399 INDUSTRIAL ENGINE:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	5N-2752 C	[1]	BRACKET
2.	0S-1571 C	[6]	BOLT
3.	1A-2029 C	[4]	BOLT
4.	1D-4717 C	[6]	NUT
5.	3B-4506 C	[14]	LOCKWASHER
6.	5N-2741 C	[1]	BRACKET
7.	6B-0933 C	[2]	SPACER
8.	1H-4725	[1]	SILENCER
9.	5N-2747 C	[2]	BAND ASSEM.
10.	7H-2444	[1]	SEAL
11.	5F-6658	[1]	JAR
12.	1H-4768	[1]	GASKET
13.	3N-9309	[1]	FLANGE
14.	5P-1262 CH		HOSE 12.70 cm(5 in.)
15.	9M-7959 C	[2]	CLAMP
16.	3B-6500 C	[2]	ELBOW
17.	3B-7296 C	[2]	NIPPLE
18.	0S-1588 C	[4]	BOLT
	C		INDICATES CHANGE
	H		ORDER BY THE CENTIMETER

#UEG0637S0536

5N-8762: SILENCER GP-AIR STARTING

SILENCER GP-AIR STARTING

5N8762 AIR STARTING SILENCER GROUP
Serial No. 35B688-Up. FOR USE WITH 5N8720, 5N8721, 5N8722, 5N8723,
5N8724, 5N8725, 5N8726 AND 5N8727 AIR STARTING MOTORS

c303221 UEG0637S

5N8762 SILENCER GP-AIR STARTING Parts scheme

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Parts for your D399 INDUSTRIAL ENGINE:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	1H-4725	[1]	ARRESTOR-VAPOR
2.	5N-8763	[2]	BRACKET
3.	1A-2029	[6]	BOLT
4.	1D-4717	[8]	NUT
5.	5M-2894	[24]	WASHER
6.	5F-6044	[4]	BOLT
7.	5B-8085	[4]	SPACER
8.	0S-1571	[6]	BOLT
9.	0L-1492	[1]	NIPPLE-PIPE
10.	3B-7286	[1]	NIPPLE-PIPE
11.	5N-8764	[1]	BRACKET
12.	7B-7138	[1]	ELBOW
13.	6H-6673 B	[1]	PIPE
14.	5P-1262 E		HOSE 12.70CM(5IN)
15.	9M-7959	[2]	CLAMP
16.	4B-2694	[1]	PIPE
17.	3B-6500	[2]	ELBOW
18.	5F-6658	[1]	JAR-PRECLEANER
19.	7H-2444	[1]	SEAL
20.	3N-9309	[1]	FLANGE
21.	1H-4768	[1]	GASKET
22.	5N-2747	[2]	BAND AS
23.	6B-0933	[2]	SPACER
	B		USE AS REQUIRED
	E		ORDER BY THE CENTIMETER

#UEG0637S0537

5N-8642: LINES GP-AIR CONTROL

LINES GP-AIR CONTROL

5N8642 AIR CONTROL LINES GROUP--R.H.--REPLACED BY 2W7127 & 2W7128--
Page 84B.02.01 & 84B.02.02 S/N 35B6619-Up
For Use With Electric Starting Motors Or Air Starting Motors
An Attachment

c183134 UEG0637S

5N8642 LINES GP-AIR CONTROL Parts scheme

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Parts for your D399 INDUSTRIAL ENGINE:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	2N-1287	[1]	ELBOW-FLARED
2.	1W-8773	[1]	TUBE AS
3.	3B-1915	[1]	BOLT
4.	5M-2894	[1]	WASHER
5.	6H-7127	[1]	LUG
6.	3S-1099	[1]	ELBOW-FLARED
7.	5P-5773	[1]	ELBOW-STREET
8.	3B-6552	[2]	ELBOW
9.	7M-9222	[2]	HOSE AS
10.	7D-1728	[1]	CLIP
11.	9S-1366	[1]	BOLT
12.	5P-8245	[1]	WASHER
13.	6L-1698	[1]	SPACER
14.	7M-0873	[1]	CLIP
15.	5N-6411	[1]	VALVE AS-2 WAY
16.	5N-7132	[1]	BRACKET
17.	1A-9579	[1]	BOLT
18.	3L-2875	[1]	CLIP
19.	9M-1974	[2]	WASHER
20.	5N-9522	[1]	VALVE GP-DIVERTER

#UEG0637S0538

2W-7127: LINES GP-AIR CONTROL

LINES GP-AIR CONTROL

2W7127 AIR CONTROL LINES GROUP--L.H.
Serial No. 35B6619-Up
4W1704--Page 84B.02.03
For Use With Air Start Motors Without Prelube. An Attachment

c328253 UEG0637S

2W7127 LINES GP-AIR CONTROL Parts scheme

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Parts for your D399 INDUSTRIAL ENGINE:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	4W-1704 Y	[1]	VALVE GP-DIVERTER
2.	2N-1287	[1]	ELBOW-FLARED
3.	1W-8772	[1]	TUBE AS
4.	5M-2894	[2]	WASHER
5.	0S-1590	[1]	BOLT
6.	9L-4234	[1]	SPACER
7.	3L-2875	[1]	CLIP
8.	8M-2772	[1]	CLIP
9.	3S-1099	[1]	ELBOW-FLARED
10.	3B-1915	[1]	BOLT
11.	6F-6405	[1]	SPACER
12.	5N-6411	[1]	VALVE AS-2 WAY
		[1]	KNOB
13.	3B-6552	[1]	ELBOW
14.	5P-9385	[1]	TEE-HYDRAULIC PIPE
15.	7M-9222	[1]	HOSE AS
	Y		SEPARATE ILLUSTRATION

#UEG0637S0539

2W-7128: LINES GP-AIR CONTROL

LINES GP-AIR CONTROL

2W7128 AIR CONTROL LINES GROUP--R.H.
Serial No. 35B6619-Up
4W1704--Page 84B.02.03
For Use With Air Start Motors Without Pre-Lube. An Attachment

c328249 UEG0637S

2W7128 LINES GP-AIR CONTROL Parts scheme

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Parts for your D399 INDUSTRIAL ENGINE:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	1W-8773	[1]	TUBE AS
2.	2N-1287	[1]	ELBOW-FLARED
3.	4W-1704 Y	[1]	VALVE GP-DIVERTER (DIVERTER)
4.	5P-8245	[1]	WASHER
5.	6L-1698	[1]	SPACER
6.	9S-1366	[1]	BOLT
7.	3B-1915	[1]	BOLT
8.	5M-2894	[1]	WASHER
9.	6H-7127	[1]	LUG
10.	3S-1099	[1]	ELBOW-FLARED
11.	7M-9222	[1]	HOSE AS
12.	7D-1728	[1]	CLIP
13.	9M-1974	[2]	WASHER
14.	1A-9579	[1]	BOLT
15.	3L-2875	[1]	CLIP
16.	5N-6411	[1]	VALVE AS-2 WAY
	2W-0630	[1]	KNOB-LOCKOUT
17.	3B-6552	[1]	ELBOW
18.	5P-9385	[1]	TEE-HYDRAULIC PIPE
19.	7M-0873	[1]	CLIP
	Y		SEPARATE ILLUSTRATION