BUCKET & ADJUSTER GP 3855649 - Caterpillar

Attach chuck (8) to the stem of the gas valve on the accumulator by turning the swivel on the chuck clockwise. Tighten chuck (8) until the chuck is finger tight. Tighten chuck (8) to an additional one quarter turn in order to seat the seal.Note: To prevent damage to the valve core for the accumulator, ensure that the tee handle on the chuck is turned completely counterclockwise before the chuck is installed on the valve stem for the accumulator. Do not force the chuck.
Connect the hose from valve (4) to the regulator assembly that is located near pressure gauge (1). The hose is part of the nitrogen charging group.
Turn the knob on the valve for the nitrogen cylinder clockwise in order to open the valve. The pressure gauge on the pressure regulator will show the pressure in the nitrogen cylinder. Pressure gauge (1) should show zero.
Turn the tee handle on the chuck clockwise until resistance is felt in order to unseat the valve core on the accumulator. Do not force the chuck.
Turn screw (6) for the pressure regulator counterclockwise until the indicator needle on pressure gauge (1) moves from zero.
Crack valve (4) in order to slowly fill the bladder inside the accumulator. Allow the bladder to expand slowly in order to completely fill the inside of the accumulator cylinder.
When the pressure reading on pressure gauge (5) and the pressure reading on pressure gauge (1) are equal, shut valve (4) .
Adjust pressure regulating screw (6) on the regulator assembly until pressure gauge (1) is at the pressure that will charge the accumulator. Use Table 3 as a reference for the correct charging pressure.
Open valve (4) in order to charge the steering accumulator.
Adjust the valves until the pressure reading on gauge (5) and the pressure reading on gauge (1) show the correct pressure. Allow a waiting period of ten minutes for the temperature of the nitrogen inside the accumulator to stabilize. If the nitrogen pressure charge is low, adjust screw (6) for the pressure regulator counterclockwise in order to increase the charge pressure.
If there is a decrease in pressure on pressure gauge (5), open valve (4). This will allow more nitrogen to enter the steering accumulator.
Repeat Step 5 and Step 6 until the following conditions occur.
Gauge (5) and gauge (1) show equal pressure.
Pressure readings do not change.
Close the valve on the nitrogen cylinder.
Turn valve handle (7) on chuck (8) counterclockwise or turn the valve handle on Tool (B) counterclockwise.
Remove the test equipment.
Illustration 4 g00664501
This is a typical view of the top of an accumulator. (B) 169-4812 Seal (C) Cap
Replace the 169-4812 Seal (B) before cap (C) is installed. Note: The 169-4812 Seal (B) is part of the bladder. Brake Accumulator for Dampening the Service Brakes
Dry nitrogen is the only gas approved for use in the accumulator. Charging the accumulator with oxygen gas will cause an explosion. This danger will not happen if nitrogen cylinders with standard CGA (Compressed Gas Association, Inc.) Number 580 connections are used. When you