STUD 9L2375 - Caterpillar

Illustration 4 g01944349
The rear manifold for the brake and differential lock is located in the rear frame below the loader. Remove the oval shaped panel from the frame in order to access the manifold.
Connect a pressure gauge to the "GAC" port of the rear brake manifold.
Run the machine for five minutes. Once the accumulator is fully charged observe the pressure gauge during the charge cycles. The pressure should be 15237 4757 kPa (2210 690 psi).The duration of the charge cycle is approximately 45 seconds. If the accumulator charging cycles are occurring for a longer rate of 24 seconds, check the accumulator charge pressure. Accumulator charge pressure should be 6205 1034 kPa (900 150 psi).If the accumulator charge pressure is at the recommended specification replace the manifold for the brake and differential lock. The charge valve for the accumulator is integral to the manifold and the valve is not serviceable.Charging
Table 1
Required Tools
Part Number Description Quantity
175-5507 Nitrogen Charging Group 1
224-5152 Adapter 1
8T-0846 Pressure Gauge 1
Table 2
Accumulator Precharge Pressure/Temperature Relationship for the 690 kPa (100 psi) Pilot Oil Accumulator
Temperature Pressure
−7°C (20°F) 625 kPa (91 psi)
−1°C (30°F) 638 kPa (92 psi)
4°C (40°F) 651 kPa (94 psi)
10°C (50°F) 664 kPa (96 psi)
16°C (60°F) 677 kPa (98 psi)
21°C (70°F) 690 kPa (100 psi)
27°C (80°F) 703 kPa (102 psi)
32°C (90°F) 716 kPa (104 psi)
38°C (100°F) 729 kPa (106 psi)
43°C (110°F) 742 kPa (108 psi)
49°C (120°F) 755 kPa (110 psi)
Ensure that the oil in the hydraulic system is at normal operating temperature. Park the machine on a smooth, level surface.
Ensure that all wheels are in contact with the ground. Keep the operating mode switch in the WORKING MODE position.
Engage the parking brake.
Stop the engine.
Turn the engine start switch to the ON position. Move the implement joysticks and the steering through the full range of travel. Depress the brake pedal several times. This will release all the pressure in the hydraulic system.
Turn the engine start switch to the OFF position.
Illustration 5 g01944337
The front brake accumulator is located on the front frame with access through the belly guard.
Illustration 6 g01944336
The rear brake accumulator is located in the rear frame. The accumulator is accessible through the access panel on the top of the bunk.
Remove the plug from the accumulator. Attach a 0 to 1000 kPa (0 to 145 psi) pressure gauge to the accumulator. The indicated pressure on the gauge should be the pressure in Table 2. If the recorded pressure is not correct, perform Steps 8 through 13.
Install the 224-5152 Adapter to the accumulator.
Illustration 7 g00107133
Nitrogen Charging Group
(1) Nipple. (2) Coupling assembly. (3) Pressure gauge. (4) Hose assembly. (5) Coupling assembly. (6) Nipple. (7) Valve. (8) Pressure gauge. (9) Regulator assembly. (10) Pressure regulating screw. (11) Chuck for the nitrogen cylinder valve. (12) Valve handle. (13) Chuck. (14) Hose assembly.
Ensure that valve (7) is closed. Install chuck (13) onto the adapter for the pilot accumulator. Turn valve handle (12) completely in the clockwise direction.
Check the temperature