312F and 313F Excavator Machine System Specifications Pump Head (Main) Caterpillar


Pump Head (Main)
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Illustration 1g06016774

Table 1
Specification for 439-5944 Pump Head Gp 
Item  Qty  Part  Specification Description 
094-1882 Plug  Before assembly, apply blue Loctite 5188 to threads.
Torque to 13 ± 2 N·m (115 ± 18 lb in)


Illustration 2g06016776
Section A-A

Table 2
Item  Qty  Part  Specification Description 
8T-4133 Nut  Torque to 45 ± 5 N·m (33 ± 4 lb ft)
200-3255 Nut  Torque to 100 ± 10 N·m (74 ± 7 lb ft)
273-8316 O-Ring Seal  Before assembly, lubricate the bores lightly with the lubricant that is being sealed. 
8T-4132 Nut  Torque to 125 ± 20 N·m (92 ± 15 lb ft)
190-7674 O-Ring Seal  Before assembly, lubricate the bores lightly with the lubricant that is being sealed. 
281-6847 Piston  Apply Loctite 263 to the threads of piston and leave the piston to dry at room temperature for minimum of four hours. 
192-2376 Pin As  Torque to 147 ± 15 N·m (108 ± 11 lb ft)
273-8317 O-Ring Seal  Before assembly, lubricate the bores lightly with the lubricant that is being sealed. 
10  273-8318 O-Ring Seal  Before assembly, lubricate the bores lightly with the lubricant that is being sealed. 
11  342-1931 Spring  Length under test force is 33.4 mm (1.32 inch).
Test force is 40.0 N (9.0 lb).
Free length after test is 34.4 mm (1.35 inch)
12  200-3247 Spring  Length under test force is 43.4 mm (1.71 inch).
Test force is 101.0 ± 5.0 N (22.7 ± 1.1 lb).
Free length after test is 47.200 mm (1.8583 inch)
13  099-3671 Spring  Length under test force is 14.5 mm (0.57 inch).
Test force is 8.8 ± 0.7 N (2.0 ± 0.2 lb).
Free length after test is 26.5 mm (1.04 inch)
14  As required, use the following shims to adjust the test force of the spring (15): 
2 099-3669 Shim  Thickness of one shim is 1.0 mm (0.04 inch)
2 099-6109 Shim  Thickness of one shim is 1.05 mm (0.041 inch)
2 099-6110 Shim  Thickness of one shim is 1.1 mm (0.04 inch)
2 099-6111 Shim  Thickness of one shim is 1.15 mm (0.045 inch)
2 099-6112 Shim  Thickness of one shim is 1.2 mm (0.05 inch)
2 099-6113 Shim  Thickness of one shim is 1.25 mm (0.049 inch)
2 099-6115 Shim  Thickness of one shim is 1.3 mm (0.05 inch)
15  267-1625 Spring  Length under test force is 42.0 mm (1.65 inch).
Test force is 146.9 N (33.0 lb).
Free length after test is 43.400 mm (1.7087 inch)
16  6V-5391 O-Ring Seal  Before assembly, lubricate the bores lightly with the lubricant that is being sealed. 


Illustration 3g06016794
Section B-B

Table 3
Item  Qty  Part  Specification Description 
17  2H-9247 O-Ring Seal  Before assembly, lubricate the bores lightly with the lubricant that is being sealed. 
18  3J-1907 O-Ring Seal  Before assembly, lubricate the bores lightly with the lubricant that is being sealed. 
19  189-9763 O-Ring Seal  Before assembly, lubricate the bores lightly with the lubricant that is being sealed. 
094-1875 Dowel  Installation depth is 3.55 to 3.80 mm (0.140 to 0.150 inch)

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