320E and 323E Excavators Machine System Specifications Caterpillar

Relief Valve (Boom Lowering Control Device)

Usage:

320E AWS

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Illustration 1	g02249115

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Table 1
Specification for 335-0405 Check and Relief Valve Gp
Item	Qty	Part	Specification Description
1	1	270-5731 Relief Valve Gp	Torque to 95 ± 14 N·m (70 ± 10 lb ft).
2	-	-	Torque nut to 58.8 ± 5.9 N·m (43.4 ± 4.4 lb ft).
3	-	-	Torque to nut 19.6 ± 2.0 N·m (173.5 ± 17.7 lb in).
4	1	165-9514 Plug	Torque to 48 ± 5 N·m (35 ± 4 lb ft).
5	1	165-9513 Seat	Torque to 2.25 ± 0.25 N·m (19.91 ± 2.21 lb in).
6	1	5C-2874 Nut	Torque to 4.0 ± 0.5 N·m (35.4 ± 4.4 lb in).
7	1	3H-0442 O-Ring Seal	Lubricate the bore lightly with the lubricant that is being sealed.
8	7	225-4818 Plug As	Torque to 10 ± 1 N·m (89 ± 9 lb in).
9	4	225-4820 Plug As	Torque to 23 ± 2 N·m (204 ± 18 lb in).
10	3	8J-6815 Orifice Plug	Torque to 13 ± 2 N·m (115 ± 18 lb in).

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Illustration 2	g02730823

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Table 2
Item	Qty	Part	Specification Description
11	4	8T-4139 Bolt	Torque to 100 ± 20 N·m (74 ± 15 lb ft).
12	As required, use the following shims:
	1	225-4833 Shim	Thickness is 0.10 mm (0.004 inch).
	2	225-4832 Shim	Thickness is 0.2 mm (0.01 inch).
	2	225-4831 Shim	Thickness is 0.5 mm (0.02 inch).
	1	225-4830 Shim	Thickness is 1.0 mm (0.04 inch).
13	1	225-4792 Plug	Torque to 300 ± 40 N·m (221 ± 30 lb ft).
14	2	095-1789 Ring	Lubricate the bore lightly with the lubricant that is being sealed.
15	2	095-1594 O-Ring Seal	Lubricate the bore lightly with the lubricant that is being sealed.
16	1	225-4790 Spring	Length under test force is 53.300 mm (2.0984 inch). Test force is 183.147 ± 9.157 N (41.173 ± 2.059 lb). Free length after test is 57.400 mm (2.2598 inch).
17	1	225-4793 Valve As	Torque to 35 ± 3 N·m (26 ± 2 lb ft).
18	2	122-7797 Ring	Lubricate the bore lightly with the lubricant that is being sealed.
19	2	6V-5326 O-Ring Seal	Lubricate the bore lightly with the lubricant that is being sealed.
20	1	225-4797 Valve As	Torque to 215 ± 25 N·m (159 ± 18 lb ft).
21	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).

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