CYLINDER GP-TILT 4781351 - Caterpillar

Illustration 1 g00107133
(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 assemblyCheck the Nitrogen Charge in the Accumulator
Illustration 2 g06221927
Brake Accumulator
(15) Bolts
(16) Cover
(17) Cap for the nitrogen charging valve
(18) Nitrogen charging valve
(19) Accumulator
Remove two bolts (15) and cover (16) from accumulator (19). Remove cap (17) from nitrogen charging valve (18).
Use pressure gauge (8) to check the amount of nitrogen charge in the accumulator.
Install chuck (13) on nitrogen charging valve (18).
Make sure that valve (7) is closed. Install valve handle (12) onto chuck (13). Rotate valve handle (12) clockwise until the valve is closed.
Check the temperature of the air around the accumulator. The reading on the pressure gauge must be within the tolerances in Table 2.
If the reading on the pressure gauge is too high, slowly open valve (7) to lower the pressure.If the reading on the pressure gauge is too low, charge the accumulator.Nitrogen Charging Procedure
When you charge an accumulator, make sure that you remove all of the oil from the oil end of the accumulator by charging the accumulator with nitrogen gas. Then, apply the service brakes repeatedly. The accumulator is charged when the application of the service brakes does not decrease the pressure of the nitrogen.
Illustration 3 g00107133
(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
Assemble the nitrogen charging group. Connect chuck (11) to a dry nitrogen cylinder.
Close valve (7) and open the valve on the nitrogen cylinder. Adjust pressure regulating screw (10) on the regulator assembly until pressure gauge (3) is at the required pressure for charging the accumulator. Refer to Table 2.
Open valve (7) and charge the accumulator. Close valve (7).
If the readings on pressure gauge (8) and on pressure gauge (3) remain identical, the accumulator has the correct charge.If the reading on pressure gauge (8) decreases, open valve (7) and allow more nitrogen to go into the accumulator.Perform Steps 1 through 4 until the readings on pressure gauge (8) and on pressure gauge (3) remain identical.
Close valve (7) and the valve on the nitrogen cylinder.
Turn valve handle (12) on chuck (13) completely in the counterclockwise direction.
Remove the test equipment.Nitrogen Charging Procedure for Rebuilt Accumulators
It will be necessary to remove all of the air from the valve end of the accumulator. When the accumulator is rebuilt, put approximately 1.9 L (2.00 qt) of SAE 10 hydraulic oil in the valve end of the accumulator to lubricate the seal on the accumulator piston. This oil also helps to remove the air from the valve end of the accumulator. After the accumulator is installed on the machine, use the following procedure to charge the accumulator.
Illustration 4 g00107133
(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
Assemble the nitrogen charging