374F Excavator Machine System Relief Valve (Boom Lowering Control Device) Caterpillar


Relief Valve (Boom Lowering Control Device)
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Illustration 1g03506075

Table 1
Specification for 399-8414 Check and Relief Valve Gp    
Item     Qty     Part     Specification description    
1     5     225-4818 Plug As     Torque to 10 ± 2 N·m (89 ± 18 lb in).    
2     1     225-4820 Plug As     Torque to
23 ± 2 N·m (204 ± 18 lb in).    
3     1     190-8602 Check Valve Gp     Torque to
150 ± 15 N·m (111 ± 11 lb ft).    
4     1     448-5704 Relief Valve Gp     Torque to
300 ± 40 N·m (221 ± 30 lb ft).    



Illustration 2g03506076

Table 2
Item     Qty     Part     Specification description    
5     As required, use the following shims:    
3 9N-1574 Shim     Thickness is
0.25 mm (0.010 inch).    
2 9N-1575 Shim     Thickness is
0.76 mm (0.030 inch).    
6     1     335-3038 Spring     Length under test force is
55.6 mm (2.19 inch).    
Test force is
258.5 ± 16.0 N (58.1 ± 3.6 lb).
Free length after test is
61 mm (2.4 inch).
7     1     8J-6815 Orifice Plug     Torque to
13 ± 2 N·m (115 ± 18 lb in).    
8     1     264-6346 Guide     Torque to
35 ± 4 N·m (26 ± 3 lb ft).    
9     1     8C-3085 O-Ring Seal     Lubricate the bore lightly with the lubricant that is being sealed.    
10     1     153-8623 Backup Ring     Lubricate the bore lightly with the lubricant that is being sealed.    
11     1     4J-0522 O-Ring Seal     Lubricate the bore lightly with the lubricant that is being sealed.    
12     1     4I-6397 Backup Ring     Lubricate the bore lightly with the lubricant that is being sealed.    
13     1     6V-3922 O-Ring Seal     Lubricate the bore lightly with the lubricant that is being sealed.    
14     1     4T-5071 Backup Ring     Lubricate the bore lightly with the lubricant that is being sealed.    
15     1     095-1599 O-Ring Seal     Lubricate the bore lightly with the lubricant that is being sealed.    
16     1     095-1793 Backup Ring     Lubricate the bore lightly with the lubricant that is being sealed.    
17     1     369-8572 Check Valve Spring     Length under test force is
39 mm (1.5 inch).    
Test force is
15.0 ± 0.8 N (3.4 ± 0.2 lb).
Free length after test is
52.70 mm (2.075 inch).

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