BEARING 5W0755 - Caterpillar

Stop the engine. Release the pressure from the hydraulic system. Refer to Testing and Adjusting, "General Information".
Turn purging screw (2) in a counterclockwise direction for 1 to 2 turns in order to release the pressure in the track tension cylinder.Gas pressure is variable with temperature. Check the temperature of the air around the accumulator. In order to check the amount of charge in an accumulator, the accumulator must be at the same temperature as the surrounding air.Note: The temperature of the accumulator may change as the accumulator is being charged due to the expansion or compression of the nitrogen charge. It may be necessary to charge the accumulator in several steps in order to ensure a correct charge.Use table 2 to determine the correct amount of gas pressure to use.
Table 2
Charge Pressures and Temperatures for 158-8730 Accumulator    
Temperature     Pressure    
-23°C (-10°F)    
4754 kPa (690 psi)    
-21°C (-5°F)    
4809 kPa (698 psi)    
-18°C (0°F)    
4857 kPa (705 psi)    
-15°C (5°F)    
4912 kPa (713 psi)    
-12°C (10°F)    
4967 kPa (721 psi)    
-9°C (15°F)    
5022 kPa (729 psi)    
-7°C (20°F)    
5077 kPa (737 psi)    
-4°C (25°F)    
5133 kPa (745 psi)    
-1°C (30°F)    
5181 kPa (752 psi)    
2°C (35°F)    
5236 kPa (760 psi)    
4°C (40°F)    
5291 kPa (768 psi)    
7°C (45°F)    
5346 kPa (776 psi)    
10°C (50°F)    
5401 kPa (784 psi)    
13°C (55°F)    
5456 kPa (792 psi)    
16°C (60°F)    
5505 kPa (799 psi)    
18°C (65°F)    
5560 kPa (807 psi)    
21°C (70°F)    
5615 kPa (815 psi)    
24°C (75°F)    
5670 kPa (823 psi)    
27°C (80°F)    
5725 kPa (831 psi)    
29°C (85°F)    
5780 kPa (839 psi)    
32°C (90°F)    
5828 kPa (846 psi)    
35°C (95°F)    
5884 kPa (854 psi)    
38°C (100°F)    
5939 kPa (862 psi)    
41°C (105°F)    
5994 kPa (870 psi)    
43°C (110°F)    
6049 kPa (878 psi)    
46°C (115°F)    
6104 kPa (886 psi)    
49°C (120°F)    
6152 kPa (893 psi)    Use the 7S-5437 Nitrogen Charging Group in order to test and charge the track tension accumulator.
Illustration 3 g00489365
7S-5437 Nitrogen Charging Group (3) Pressure gauge (4) Connection to nitrogen cylinder valve (5) Regulator assembly (6) Valve (7) Pressure gauge (8) Pressure regulating screw (9) Valve handle (10) ChuckChecking the Nitrogen charge of the Track Tension Accumulator
Rotate valve handle (9) on chuck (10) counterclockwise until the valve handle reaches the full out position. Close valve (6) .
Remove cap (1) from the valve assembly on the accumulator.
Install chuck (10) on the valve assembly of the accumulator.
Rotate valve handle (9) on chuck (10) clockwise until the valve assembly is completely opened.
Use pressure gauge (7) to check the amount of nitrogen charge in the accumulator. Check the temperature of the air around the accumulator. The pressure on the gauge must be within the values