BRACKET 2D7917 - Caterpillar

Ensure that all wheels are in contact with the ground. Place the bogie float switches in the FLOAT position.
Illustration 2 g00658192
Parking Brake Switch
Press the top of the switch in order to engage the parking brake. This will also lower the ladder.
Install the steering frame lock. Block the wheels. Raise the grapple.
Stop the engine.
Turn the key to the ON position.
Illustration 3 g00800981
Operating Mode Switch on the Right Hand Control Unit
Place the operating mode switch in the WORKING MODE position.
Illustration 4 g00801518
Joystick for the Boom
Press the joystick forward in order to lower the boom. You should be able to lower the boom up to 1.5 minutes after the engine has stopped.
Lower the boom to the ground. If the boom will not lower, refer to the charging section.Charging
Table 1
Required Tools
Part Number Description Quantity
7S-5437 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 bogie float switches in the FLOAT position. 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. Ensure that the operating mode switch is in the WORKING MODE position. Move the implement joysticks and the steering wheel 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.
Tip up the fuel tank in order to access the pilot accumulator. The pilot oil accumulator is located below the implement control valve on the 554 Forwarder. The pilot oil accumulator is located next to the accumulator for the transmission on the 574 Forwarder.
Remove the plug from the bottom of the accumulator. Attach a 0 to 1000 kPa (0 to 145 psi) pressure gauge to the bottom of the accumulator. The indicated pressure on the gauge should be the pressure in Table 2. If the recorded pressure is not correct, perform step 9 through step 14.
Install the 224-5152 Adapter in the bottom of the accumulator.
Illustration 5 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