320D and 323D Excavators Machine System Specifications Caterpillar

Main Control Valve

Usage:

320D A6F

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Illustration 1	g03408143
(Section A-A) Boom regeneration valve (Section B-B) Stick unloading valve and stick regeneration valve (Section C-C) Line relief valve for the negative flow control in the right valve bank (Section D-D) Stick (2) (Section E-E) Boom (1) (Section F-F) Bucket (Section G-G) Attachment (Section H-H) Travel (Right side) (Section J-J) Straight Travel (Section K-K) Travel (Left side) (Section L-L) Swing (Section M-M) Stick (1) (Section N-N) Boom (2) (Section P-P) Line relief valve for the negative flow control in the left valve bank

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Table 1
Specification for 259-7464 Main Control Valve Gp, and 270-5920 Main Control Valve Gp
Item	Qty	Part	Specification Description
1	2	111-9959 Pipe Plug	Torque to 35 ± 3 N·m (26 ± 2 lb ft).
2	40	8T-4195 Bolt	Torque to 49 ± 5 N·m (36 ± 4 lb ft).
3	2	8T-6759 Pipe Plug	Torque to 15 ± 2 N·m (133 ± 18 lb in).
4	1	114-0623 Nut	Torque to 7.4 ± 0.5 N·m (65.5 ± 4.4 lb in).
5	1	121-1491 Solenoid Valve Gp	Lubricate the O-ring seals of the solenoid valve group lightly with the lubricant that is being sealed.
6	2	225-4818 Plug As	Torque to 10 ± 1 N·m (89 ± 9 lb in).

Boom Regeneration Valve

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Illustration 2	g03408144
Section A-A

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Table 2
Item	Qty	Part	Specification Description
-	Lubricate the O-ring seals and the backup ring lightly with lubricant that is being sealed.
7	1	236-6421 Plug	Torque to 220 ± 20 N·m (162 ± 15 lb ft).
8	1	153-5293 Spring	Length under test force is 33.45 mm (1.317 inch). Test force is 21.2 ± 1.1 N (4.8 ± 0.2 lb). Free length after test is 38.55 mm (1.518 inch).
9	1	153-5290 Plug	Torque to 285 ± 30 N·m (210 ± 22 lb ft).
10	1	153-5291 Connector	Torque to 105 ± 10 N·m (77 ± 7 lb ft).
11	1	153-5288 Spring	Length under test force is 52.5 mm (2.07 inch). Test force is 145.4 ± 7.3 N (32.7 ± 1.6 lb). Free length after test is 55.7 mm (2.19 inch).

Stick Unloading Valve and Stick Regeneration Valve

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Illustration 3	g03408145
Section B-B

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Table 3
Item	Qty	Part	Specification Description
-	Lubricate the O-ring seals and the backup ring lightly with lubricant that is being sealed.
12	1	236-6421 Plug	Torque to 220 ± 20 N·m (162 ± 15 lb ft).
13	1	153-5293 Spring	Length under test force is 33.45 mm (1.317 inch). Test force is 21.2 ± 1.1 N (4.8 ± 0.2 lb). Free length after test is 38.55 mm (1.518 inch).
14	1	153-5288 Spring	Length under test force is 52.5 mm (2.07 inch). Test force is 145.4 ± 7.3 N (32.7 ± 1.6 lb). Free length after test is 55.7 mm (2.19 inch).
15	2	153-5290 Plug	Torque to 285 ± 30 N·m (210 ± 22 lb ft).
16	1	153-5291 Connector	Torque to 105 ± 10 N·m (77 ± 7 lb ft).
17	1	123-2485 Plug	Torque to 35 ± 3 N·m (26 ± 2 lb ft).
18	1	153-5311 Spring	Length under test force is 65.5 mm (2.58 inch). Test force is 179.8 ± 9.0 N (40.4 ± 2.0 lb). Free length after test is 80.4 mm (3.17 inch).

Negative Flow Control (Right side)

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Illustration 4	g03408160
Section C-C

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Table 4
Item	Qty	Part	Specification Description
-	Lubricate the O-ring seals and the backup ring lightly with lubricant that is being sealed.
19	1	107-6370 Spring	Length under test force is 44.0 mm (1.73 inch). Test force is 565.3 ± 45.2 N (127.1 ± 10.2 lb). Free length after test is 49.3 mm (1.94 inch).
20	1	109-5152 Relief Valve Gp	Torque to 145 ± 15 N·m (107 ± 11 lb ft).
21	As required, Use the following shims:
	1	4J-7386 Shim	Thickness is 0.25 mm (0.010 inch).
	1	4J-7385 Shim	Thickness is 1.22 mm (0.048 inch).
22	1	236-6419 Plug	Torque to 240 to 260 N·m (177 to 192 lb ft).
23	1	7I-1248 Spring	Length under test force is 23.9 mm (0.94 inch). Test force is 6.174 N (1.388 lb). Free length after test is 28.0 mm (1.10 inch).

Stick (2)

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Illustration 5	g03408172
Section D-D

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Table 5
Item	Qty	Part	Specification Description
-	Lubricate the O-ring seals and the backup ring lightly with lubricant that is being sealed.
24	1	236-6419 Plug	Torque to 240 to 260 N·m (177 to 192 lb ft).
25	1	7I-1248 Spring	Length under test force is 23.9 mm (0.94 inch). Test force is 6.174 N (1.388 lb). Free length after test is 28.0 mm (1.10 inch).
26	1	104-7294 Spring	Length under test force is 55.5 mm (2.19 inch). Test force is 594 ± 30 N (134 ± 7 lb). Free length after test is 62.27 mm (2.452 inch).
27	1	153-5276 Special Bolt	Before assembly, apply red Loctite 271 to threads of bolt. Torque to 50.0 to 59.8 N·m (36.9 to 44.1 lb ft).

Boom (1)

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Illustration 6	g03408175
Section E-E

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Table 6
Item	Qty	Part	Specification Description
-	Lubricate the O-ring seals and the backup ring lightly with lubricant that is being sealed.
28	1	236-6419 Plug	Torque to 240 to 260 N·m (177 to 192 lb ft).
29	1	7I-1248 Spring	Length under test force is 23.9 mm (0.94 inch). Test force is 6.174 N (1.388 lb). Free length after test is 28.0 mm (1.10 inch).
30	1	352-7122 Relief Valve Gp	Torque to 95 ± 14 N·m (70 ± 10 lb ft).
31	-	Nut	Torque to 58.8 ± 5.9 N·m (43.4 ± 4.4 lb ft).
32	-	Nut	Torque to 19.6 ± 2.0 N·m (173.5 ± 17.7 lb in).
33	1	104-7293 Spring	Length under test force is 55.5 mm (2.19 inch). Test force is 390 ± 20 N (88 ± 4 lb). Free length after test is 59.68 mm (2.350 inch).
34	1	153-5276 Special Bolt	Before assembly, apply red Loctite 271 to threads of bolt. Torque to 50.0 to 59.8 N·m (36.9 to 44.1 lb ft).

Bucket

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Illustration 7	g03408195
Section F-F

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Table 7
Item	Qty	Part	Specification Description
-	Lubricate the O-ring seals and the backup ring lightly with lubricant that is being sealed.
35	1	236-6419 Plug	Torque to 240 to 260 N·m (177 to 192 lb ft).
36	1	7I-1248 Spring	Length under test force is 23.9 mm (0.94 inch). Test force is 6.174 N (1.388 lb). Free length after test is 28.0 mm (1.10 inch).
37	-	Nut	Torque to 19.6 ± 2.0 N·m (173.5 ± 17.7 lb in).
38	-	Nut	Torque to 58.8 ± 5.9 N·m (43.4 ± 4.4 lb ft).
39	1	352-7122 Relief Valve Gp	Torque to 95 ± 14 N·m (70 ± 10 lb ft).
40	1	153-5276 Special Bolt	Before assembly, apply red Loctite 271 to threads of bolt. Torque to 50.0 to 59.8 N·m (36.9 to 44.1 lb ft).
41	1	104-7293 Spring	Length under test force is 55.5 mm (2.19 inch). Test force is 390 ± 20 N (88 ± 4 lb). Free length after test is 59.68 mm (2.350 inch).

Attachment

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Illustration 8	g03408200
Section G-G

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Table 8
Item	Qty	Part	Specification Description
42	1	236-6419 Plug	Torque to 240 to 260 N·m (177 to 192 lb ft).
43	1	7I-1248 Spring	Length under test force is 23.9 mm (0.94 inch). Test force is 6.174 N (1.388 lb). Free length after test is 28.0 mm (1.10 inch).
44	2	310-0404 Control Valve Plug Gp	Torque to 95 ± 14 N·m (70 ± 10 lb ft).
45	1	104-7293 Spring	Length under test force is 55.5 mm (2.19 inch). Test force is 390 ± 20 N (88 ± 4 lb). Free length after test is 59.68 mm (2.350 inch).
46	1	153-5276 Special Bolt	Before assembly, apply red Loctite 271 to threads of bolt. Torque to 50.0 to 59.8 N·m (36.9 to 44.1 lb ft).

Travel (Right side)

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Illustration 9	g03408206
Section H-H

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Table 9
Item	Qty	Part	Specification Description
47	1	104-7296 Spring	Length under test force is 55.5 mm (2.19 inch). Test force is 393 ± 20 N (88 ± 4 lb). Free length after test is 60.03 mm (2.363 inch).
48	1	153-5276 Special Bolt	Before assembly, apply red Loctite 271 to threads. Torque to 50.0 to 59.8 N·m (36.9 to 44.1 lb ft).

Straight Travel

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Illustration 10	g03408213
Section J-J

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Table 10
Item	Qty	Part	Specification Description
-	Lubricate the O-ring seals and the backup ring lightly with lubricant that is being sealed.
49	2	201-9263 Plug	Torque to 225 to 240 N·m (166 to 177 lb ft).
50	1	6I-6795 Spring	Length under test force is 24.6 mm (0.97 inch). Test force is 2.19 ± 0.17 N (0.49 ± 0.04 lb). Free length after test is 30.0 mm (1.18 inch).
51	1	4I-3510 Spring	Length under test force is 32.200 mm (1.2677 inch). Test force is 218.676 ± 10.934 N (49.161 ± 2.458 lb). Free length after test is 35.600 mm (1.4016 inch).
52	1	352-7116 Relief Valve Gp	Torque to 135 ± 10 N·m (100 ± 7 lb ft).
53	1	171-0035 Holder	Torque to 75 ± 10 N·m (55 ± 7 lb ft).
54	1	4I-7714 Nut	Torque to 50 ± 10 N·m (37 ± 7 lb ft).
55	2	4T-3148 Spring	Length under test force is 24.0 mm (0.94 inch). Test force is 4.00 ± 0.20 N (0.90 ± 0.04 lb). Free length after test is 34.8 mm (1.37 inch).
56	1	158-8135 Guide	Torque to 50 ± 7 N·m (37 ± 5 lb ft).
57	1	6E-5169 Spring	Length under test force is 53.0 mm (2.09 inch). Test force is 196.1 ± 15.7 N (44.1 ± 3.5 lb). Free length after test is 72.2 mm (2.84 inch).
58	1	2S-2596 Spring	Length under test force is 7.9 mm (0.31 inch). Test force is 4.226 ± 0.338 N (0.950 ± 0.076 lb). Free length after test is 33.3 mm (1.31 inch).

Travel (Left side)

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Illustration 11	g03408218
Section K-K

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Table 11
Item	Qty	Part	Specification Description
-	Lubricate the O-ring seals and the backup ring lightly with lubricant that is being sealed.
59	1	250-2447 Plug	Torque to 240 to 260 N·m (177 to 192 lb ft).
60	1	153-5276 Special Bolt	Before assembly, apply red Loctite 271 to threads. Torque to 50.0 to 59.8 N·m (36.9 to 44.1 lb ft).
61	1	104-7296 Spring	Length under test force is 55.5 mm (2.19 inch). Test force is 393 ± 20 N (88 ± 4 lb). Free length after test is 60.03 mm (2.363 inch).

Swing

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Illustration 12	g03408222
Section L-L

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Table 12
Item	Qty	Part	Specification Description
-	Lubricate the O-ring seals and the backup ring lightly with lubricant that is being sealed.
62	1	250-2447 Plug	Torque to 240 to 260 N·m (177 to 192 lb ft).
63	1	7I-1248 Spring	Length under test force is 23.9 mm (0.94 inch). Test force is 6.174 N (1.388 lb). Free length after test is 28.0 mm (1.10 inch).
64	1	104-7293 Spring	Length under test force is 55.5 mm (2.19 inch). Test force is 390 ± 20 N (88 ± 4 lb). Free length after test is 59.68 mm (2.350 inch).
65	1	153-5276 Special Bolt	Before assembly, apply red Loctite 271 to threads. Torque to 50.0 to 59.8 N·m (36.9 to 44.1 lb ft).

Stick (1)

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Illustration 13	g03408224
Section M-M

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Table 13
Item	Qty	Part	Specification Description
-	Lubricate the O-ring seals and the backup ring lightly with lubricant that is being sealed.
66	1	264-9961 Plug	Torque to 305 to 325 N·m (225 to 240 lb ft).
67	1	153-5306 Spring	Length under test force is 31.5 mm (1.24 inch). Test force is 4.10 ± 0.20 N (0.92 ± 0.04 lb). Free length after test is 39.2 mm (1.54 inch).
68	1	352-7122 Relief Valve Gp	Torque to 95 ± 14 N·m (70 ± 10 lb ft).
69	-	Nut	Torque to 58.8 ± 5.9 N·m (43.4 ± 4.4 lb ft).
70	-	Nut	Torque to 19.6 ± 2.0 N·m (173.5 ± 17.7 lb in).
71	1	104-7293 Spring	Length under test force is 55.5 mm (2.19 inch). Test force is 390 ± 20 N (88 ± 4 lb). Free length after test is 59.68 mm (2.350 inch).
72	1	153-5276 Special Bolt	Before assembly, apply red Loctite 271 to threads. Torque to 50.0 to 59.8 N·m (36.9 to 44.1 lb ft).

Boom (2)

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Illustration 14	g03408230
Section N-N

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Table 14
Item	Qty	Part	Specification Description
-	Lubricate the O-ring seals and the backup ring lightly with lubricant that is being sealed.
73	3	225-4818 Plug As	Torque to 10 ± 1 N·m (89 ± 9 lb in).
74	1	158-8177 Spring	Length under test force is 61.3 mm (2.41 inch). Test force is 163.8 ± 8.2 N (36.8 ± 1.8 lb). Free length after test is 67.60 mm (2.661 inch).
75	1	158-8186 Spring	Length under test force is 34.0 mm (1.34 inch). Test force is 2.63 ± 0.34 N (0.59 ± 0.08 lb). Free length after test is 41.4 mm (1.63 inch).
76	1	4T-3148 Spring	Length under test force is 24.0 mm (0.94 inch). Test force is 4.00 ± 0.20 N (0.90 ± 0.04 lb). Free length after test is 34.8 mm (1.37 inch).
77	1	250-2446 Plug	Torque to 240 to 260 N·m (177 to 192 lb ft).
78	1	104-7294 Spring	Length under test force is 55.5 mm (2.19 inch). Test force is 594 ± 30 N (134 ± 7 lb). Free length after test is 62.27 mm (2.452 inch).
79	1	153-5276 Special Bolt	Before assembly, apply red Loctite 271 to threads. Torque to 50.0 to 59.8 N·m (36.9 to 44.1 lb ft).

Negative Flow Control (Left side)

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Illustration 15	g03408231
Section P-P

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Table 15
Item	Qty	Part	Specification Description
80	1	109-2667 Relief Valve Gp	Torque to 145 ± 15 N·m (107 ± 11 lb ft).
81	1	107-6370 Spring	Length under test force is 44.0 mm (1.73 inch). Test force is 565.3 ± 45.2 N (127.1 ± 10.2 lb). Free length after test is 49.3 mm (1.94 inch).