6D5220 PARKING AND EMERGENCY BRAKE CONTROL GROUP Part of 6D6860 Brake Control Arrangement listed on Page 168 621

Part No	Qty	Parts name
5D-4555 Y	[1]	VALVE ASSEMBLY
6D-3781 Y	[2]	VALVE ASSEMBLY
6D-5217 Y	[2]	ROTOCHAMBER ASSEMBLY
8F-9836	[4]	LUG -WELD
4J-4252	[2]	CLAMP -RESERVOIR TO LUGS
3J-2569	[1]	RESERVOIR ASSEMBLY
0S-1594	[4]	BOLT -CLAMP TO LUG
3B-4506	[6]	LOCKWASHER -3/8"
2H-5202	[1]	BODY -TO RESERVOIR
1H-8306	[1]	SCREW -TO BODY
2B-7457	[1]	PLUG -TO RESERVOIR
3J-4447	[1]	GASKET -RELAY EMERGENCY VALVE TO RESERVOIR
2D-0193	[2]	ELBOW -RELAY EMERGENCY VALVE TO HOSE ASSEMBLIES
4D-5918	[2]	HOSE ASSEMBLY -RELAY EMERGENCY VALVE TO TEE
3D-7587	[2]	UNION -HOSE ASSEMBLY TO TEE
3L-6521	[2]	TEE -TO DOUBLE CHECK VALVE
0S-1594	[2]	BOLT -VALVE ASSEMBLY TO LUG
8F-9836	[2]	LUG -WELD TO PUSH FRAME STRUT
5D-5911	[2]	HOSE ASSEMBLY -TEE TO ROTOCHAMBER
5H-4778	[13]	UNION 90 degrees-1/4"
6D-5364	[2]	HOSE ASSEMBLY -DOUBLE CHECK VALVE TO ROTOCHAMBER
3B-6553	[2]	ELBOW -HOSE ASSEMBLY TO ROTOCHAMBER
3B-7722	[1]	BUSHING-REDUCING -RESERVOIR TO NIPPLE
6D-1432	[1]	VALVE ASSEMBLY -SINGLE CHECK
3B-7738	[1]	NIPPLE -VALVE ASSEMBLY TO CROSS
7B-0192	[1]	CROSS -TO NIPPLE
4D-7969	[1]	HOSE ASSEMBLY -CROSS TO DOUBLE CHECK VALVE-L.H.
4D-7928	[1]	HOSE ASSEMBLY -CROSS TO DOUBLE CHECK VALVE-R.H.
3B-6553	[2]	ELBOW -HOSE ASSEMBLY TO DOUBLE CHECK VALVE
4D-6878	[1]	HOSE ASSEMBLY -RELAY EMERGENCY VALVE TO BLOCK ON BOWL SIDE
3D-6421	[1]	HOSE ASSEMBLY -CROSS TO BLOCK ON BOWL SIDE
4H-6147	[2]	UNION -HOSE ASSEMBLIES TO BLOCK
7J-0703	[2]	HOSE ASSEMBLY -BLOCK TO BLOCK
4H-6147	[2]	UNION -HOSE ASSEMBLIES TO BLOCK
2R-6099	[2]	BLOCK -WELD TO TUBE ASSEMBLY
3D-8884	[2]	ELBOW -BLOCK TO HOSE ASSEMBLY
4D-6878	[1]	HOSE ASSEMBLY -RELAY VALVE TO STANDARD PORT ON BOWL SIDE
4D-2850	[2]	HOSE ASSEMBLY -BLOCK TO FITTING ON DRAFT TUBE
3J-8057	[2]	CONNECTOR -TO DRAFT TUBE
4F-7506	[2]	WASHER
1D-6306	[2]	NUT
6D-5266	[1]	HOSE ASSEMBLY -CONNECTOR TO CROSS ON DIFFERENTIAL CASE
6D-5266	[1]	HOSE ASSEMBLY -CONNECTOR TO COCK ON ENGINE DASH
4J-3914	[1]	UNION -HOSE ASSEMBLY TO STANDARD PORT ON BOWL SIDE
4D-6988	[2]	CLIP -TO CLIP
4D-5371	[10]	CLIP
4K-8864	[1]	CLIP
Y		SEPARATE ILLUSTRATION

#UEG0051S0461

6D-5217: ROTOCHAMBER ASSEMBLY

ROTOCHAMBER ASSEMBLY

6D5217 ROTOCHAMBER ASSEMBLY
Part of 7D4180, 6D4700 and 6D5220 Brake Control Groups shown on Pages 168C, 168E, 170 & 173

c168111 UEG0051S

6D5217 ROTOCHAMBER ASSEMBLY Parts scheme

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
	7D-0919	[1]	KIT (rotochamber)
			(Includes Springs, Boot, Felt, Diaphragm, Pin Seals, & Hardware)
	2G-2509 C	[1]	SEAL KIT (Includes 3 Seals)
1.	7D-0922	[1]	CLAMP ASSEM.
2.	1B-4201	[8]	NUT (fine thread)
			-OR-
	1B-4330 C	[8]	NUT (coarse thread)
3.	3B-4504	[8]	LOCKWASHER
4.	8F-7334	[1]	BODY
5.	8F-7333	[1]	CLAMP ASSEM.
6.	8F-7330	[1]	GUIDE
7.	5M-3062	[8]	BOLT
8.	7D-0961	[8]	WASHER
9.	3B-4510	[2]	LOCKWASHER
10.	9S-1354	[3]	NUT
11.	0S-2564	[2]	STUD
12.	8F-9838	[1]	YOKE ASSEM.
			(Includes)
	8F-9837	[1]	BODY
13.	8S-6154	[1]	PIN
14.	3B-5301	[1]	COTTER PIN
15.	7D-2148	[1]	BOOT
16.	7D-0926	[1]	ROD
17.	7D-0962	[8]	ROLLER
18.	1B-4202	[8]	NUT (fine thread)
			-OR-
	1D-4716 C	[8]	NUT (coarse thread)
19.	3B-4505	[8]	LOCKWASHER
20.	8D-3285	[1]	PISTON
21.	7D-4361	[1]	RING (retainer)
22.	8D-3283	[1]	CAP
23.	2G-5586 C	[1]	GUARD
24.	2G-5539 C	[1]	COLLAR
25.	4B-1229 C	[4]	SCREW
	8F-1434 C	[4]	LOCKWASHER
26.	2G-9437 C	[1]	COVER
27.	2G-9439 C	[1]	BEARING
28.	2G-9436 C	[1]	SHAFT
	C		INDICATES CHANGE

#UEG0051S0462

5D-4555: EMERGENCY RELAY VALVE ASSEMBLY

EMERGENCY RELAY VALVE ASSEMBLY

5D4555 EMERGENCY RELAY VALVE ASSEMBLY
Part of 6D5220 Brake Control Group listed on Page 173

c104197 UEG0051S

5D4555 EMERGENCY RELAY VALVE ASSEMBLY Parts scheme

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	5M-6213	[2]	PLUG
2.	3M-7045	[1]	PLUG
			The following repair kits are available:
	6D-0761	[1]	KIT (Consists of Seals)
	6D-0759	[1]	KIT (Consists of Seals and Valves)

#UEG0051S0463

6D-3783: VALVE ASSEMBLY

VALVE ASSEMBLY

6D3783 VALVE ASSEMBLY
Part of 6D4700 Brake Control Group listed on Page 170

c122128 UEG0051S

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	9H-6761	[1]	SEAL
2.	6F-6672	[1]	SEAL
3.	2D-6392	[1]	SEAL
4.	4J-3960	[1]	VALVE
5.	8F-3469	[1]	SEAL

#UEG0051S0464

6D-3781: VALVE GP-CHECK

VALVE GP-CHECK

6D3781 DOUBLE CHECK VALVE ASSEMBLY--Type 1
Part of 7D4180, 6D4700 and 6D5220 Brake Control Groups
listed on Pages 168C, 168E, 170 and 173

c109717 UEG0051S

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Qty	Parts name
1.	[1]	GUIDE
2.	[2]	BOLT
3.	[2]	LOCKWASHER
4.	[1]	SHUTTLE
5.	[1]	SEAL
6.	[1]	CAP

#UEG0051S0465

2R-0619: VALVE AS-CHECK

VALVE AS-CHECK

2R619 DOUBLE CHECK VALVE ASSEMBLY
Part of Emergency Brake Control and 6D4700 Brake Control Group
shown on Pages 97B, 97D, 97F & 170

c132436 UEG0051S

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name	Comments
		[1]	GUIDE
		[1]	SHUTTLE
		[2]	BOLT
		[2]	LOCKWASHER
		[2]	WASHER
		[1]	CAP
		[1]	SEAL

#UEG0051S0466

6D-3781: VALVE GP-CHECK

VALVE GP-CHECK

6D3781 DOUBLE CHECK VALVE ASSEMBLY--Type 2
Part of 7D4180, 6D4700 and 6D5220 Brake Control Groups listed on
Pages 168C, 168E, 170 and 173

c208253 UEG0051S

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	2R-1532	[1]	GUIDE-SHUTTLE
2.	4M-5281	[2]	BOLT
3.	2R-9613	[1]	CAP
4.	3D-4869	[1]	SHUTTLE
5.	3D-4245	[1]	SEAL-O-RING

#UEG0051S0467

6D-4205: LAMP ASSEMBLY

LAMP ASSEMBLY

6D4205 LAMP ASSEMBLY
Part of Emergency Brake Control and 6D4700 Brake Control Group
shown on Pages 97A and 170

c103704 UEG0051S

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Qty	Parts name
1.	[1]	TERMINAL
2.	[1]	SPRING
3.	[1]	BULB
4.	[1]	LENS ASSEM.

#UEG0051S0468

6D-0140: HYDRAULIC ARRANGEMENT

HYDRAULIC ARRANGEMENT

6D140 HYDRAULIC ARRANGEMENT
FOR USE WITH J621 ELEVATING SCRAPER
Only Separate Parts Serviced

UEG0051S0468 UEG0051S

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Part No	Qty	Parts name
5D-9580 Y	[1]	HYDRAULIC PUMP AND LINES GROUP
5J-9700 Y	[1]	LINES GROUP
Y		SEPARATE ILLUSTRATION

#UEG0051S0469

5D-9580: HYDRAULIC PUMP AND LINES GROUP

HYDRAULIC PUMP AND LINES GROUP

5D9580 HYDRAULIC PUMP AND LINES GROUP--Part 1 of 2
Part of 6D140 Hydraulic Arrangement listed on Page 177. 7J853, 7J589 Pumps
and 6D9880 Tank parts are shown on Pages 180, 181 and 187. Only separate
parts serviced. When complete Group is required order 7D5300 shown on Pages 179A & 179B

c105643 UEG0051S

5D9580 HYDRAULIC PUMP AND LINES GROUP Parts scheme

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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS

Pos.	Part No	Qty	Parts name
1.	6D-9880 Y	[1]	TANK GROUP (Hydraulic)
			(See Separate Illustration)
2.	6D-0116	[1]	BLOCK
	2B-7409	[1]	PLUG
3.	8M-4990	[3]	SEAL
4.	4B-3388	[4]	BOLT (1.125" long)
	2B-2694	[4]	BOLT (2" long)
	3B-4505	[8]	LOCKWASHER
5.	1A-1460	[4]	BOLT
6.	3B-4508	[12]	LOCKWASHER
7.	6D-0150	[1]	FLANGE
	6J-3800	[1]	SEAL
8.	1H-5278	[4]	FLANGE
9.	2J-9608	[2]	FLANGE
10.	0S-1585	[8]	BOLT
11.	6D-9834	[1]	HOSE ASSEM. (57" long overall)
12.	7J-0853 Y	[1]	PUMP ASSEM. (Hydraulic)
			(See Separate Illustration)
13.	3H-4330	[2]	FLANGE
14.	7J-0589 Y	[1]	PUMP ASSEM. (Hydraulic)
			(See Separate Illustration)
15.	1H-6227	[1]	SEAL
16.	7F-8267 C	[1]	SEAL
17.	8F-6711 C	[1]	SEAL
	C		INDICATES CHANGE FROM PREVIOUS
	Y		SEPARATE ILLUSTRATION