Check for the Hydraulic Pressure In the Accumulator
Required Tools | |||
Tool | Part Number | Part Description | Quantity |
A | 148-1886 | Female Coupler | 1 |
B | 8T-0859 | Pressure Gauge | 1 |
- Install a 148-1886 Female Coupler to a 8T-0859 Pressure Gauge.
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Illustration 1 g00639450 - Attach the coupler to purge port (1) that is on the ram.
Note: Machines that have the older style of track tension cylinder may have both a hose and a port for purging. The port is attached to the top of the cylinder.
- Rotate the gauge to open the high-pressure quick coupler.
- Read the pressure. The pressure should be
16550 ± 345 kPa (2400 ± 50 psi) . If the pressure is low, you need to check the nitrogen pressure of the accumulator.
Releasing Track Tension Oil Pressure
- Shut off the engine.
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Illustration 2 g00639451 - Loosen the bolts and slide the guard that covers the track tension manifold to gain access to needle valve (2) and male test port (3).
- Connect the supply hose for the track tension to male test port (3).
- Locate needle valve (2). Rotate counterclockwise one turn to open the valve.
- Turn the engine start switch to the ON position. Do not start the engine.
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Illustration 3 g00639452 - Move tow point control (4) up and down and repeat several times, allowing the pressurized oil to go directly to the hydraulic tank. Observe the belt to verify that the tension is released.
- Locate needle valve (2). Rotate clockwise one turn to close the valve, preventing the tension cylinder from pressurizing.
- The pressure is now released from the track tension system.
Checking and Charging the Nitrogen Pressure
Note: Before you check the nitrogen pressure, perform the above procedure to release the pressure for the track tension.
Note: Refer to the temperature-pressure chart to find the correct accumulator precharge pressure that corresponds to the ambient air temperature.
Temperature-Pressure Chart for the Accumulator Precharge Pressure | ||
Temperature | Pressure for 107-6328 Accumulator | Pressure for 130-7623 Accumulator |
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Procedure for the 107-6328 Accumulator
Illustration 4 | g00585691 |
Required Tools | |||
Tool | Part Number | Part Description | Quantity |
C | 1U-5551 | Valve Extension | 1 |
D | 224-5152 | Male-to-Male Adapter(1) | 1 |
E | 222-2367 | Male-to-Female Adapter(2) | 1 |
F | 7S-8712 | Pressure Gauge | 1 |
G | 7S-5437 | Nitrogen Charging Group | 1 |
(1) | For use with Female Fittings |
(2) | For use with a Male and a Female Fitting |
Note: The left track tension manifold is identical to the right track tension manifold. The right track tension manifold is located below the pump compartment and the manifold is mounted on the mainframe. The left track tension manifold is located below the radiator compartment and the manifold is on the mainframe.
- Turn the engine start switch to the OFF position.
- Use the following steps to check the nitrogen charge pressure in the accumulator.
- Remove the metal plug at the rear of the accumulator.
- Install a 1U-5551 Valve Extension to the end of the 107-6328 Accumulator.
- Install a 224-5152 Adapter OR a 222-2367 Adapter to the valve extension.
- Install a 7S-8712 Pressure Gauge to the adapter to check the pressure. The pressure should be
10340 ± 1520 kPa (1500 ± 220 psi) .Note: Refer to the temperature-pressure chart to find the correct accumulator precharge pressure that corresponds to the ambient air temperature.
- If the accumulator pressure is low, check the accumulator for leakage at end covers.
- If leakage is found, replace the accumulator.
- If no leak is found or the accumulator was replaced, recharge the accumulator with 7S-5437 Nitrogen Charging Group. Recharge to a pressure of
10340 ± 1520 kPa (1500 ± 220 psi) .Note: Refer to the temperature-pressure chart to find the correct accumulator precharge pressure that corresponds to the ambient air temperature.
- Remove the adapter, the gauge, and the valve extension. Install the metal plug at the rear of the accumulator.
Note: When the nitrogen pressure has been checked and serviced properly, you will need to perform the procedure for Purging and Charging the Hydraulic Pressure.
Procedure for the 130-7623 Accumulator
Illustration 5 | g00640269 |
Required Tools | |||
Tool | Part Number | Part Description | Quantity |
G | 9U-6740 | Nitrogen Charging Group | 1 |
H | 1U-7565 | Wrench (6 mm Hex) | 1 |
I | 151-8856 | Seal (Charging) | 1 |
- Remove the cover over the plug and make sure that the area does not have any paint or grease on the area. Be sure that the side of the gauge for purging is closed.
- Rotate the plug counterclockwise by 60° with a 1U-7565 Wrench.
Note: Do not loosen the plug more than 60°, or pressure may be lost.
- Connect 9U-6740 Nitrogen Charging Group and 151-8856 Seal (Charging) to charging group into the plug on 130-7623 Accumulator.
- Hold the tee while you thread the charging group onto the accumulator to ensure that the tee does not turn.
Note: Make sure that the charging group is tight.
- Loosen the plug counterclockwise by 1 to 2 turns.
Note: Do not turn the plug more than two turns.
- The gauge should read
15170 ± 1515 kPa (2200 ± 220 psi) .Note: If the accumulator is not at the proper pressure, service the accumulator with 9U-6740 Nitrogen Charging Group and 151-8856 Seal (Charging). Use the instructions in the charging group to service the accumulator to a pressure of
15170 ± 1515 kPa (2200 ± 220 psi) . Reference the temperature-pressure chart to find the correct pressure that corresponds to the ambient air temperature. - Hand tighten the plug clockwise with the tee on the assembly. Relieve the pressure on the gauge by turning the purge valve counterclockwise. Remove the charging group from the accumulator. Tighten the plug to a maximum torque of
11.5 N·m (8.5 lb ft) .Note: When the nitrogen pressure has been checked and serviced properly, you will need to perform the procedure for Purging and Charging the Hydraulic Pressure.
Purging and Charging the Hydraulic Pressure
Required Tools | |||
Tool | Part Number | Part Description | Quantity |
J | 8T-0859 | Pressure Gauge | 1 |
K | 122-6887 | Hose (50 inches) | 1 |
124-2111 | Permanent Coupling | 1 | |
148-1886 | Female Coupler | 1 | |
4J-5477 | O-Ring Seal | 1 | |
8C-6866 | Connector | 1 |
- Connect the oil supply hose in the auxiliary system to the track tension manifold.
- Open needle valve (2) on top of the manifold 1 to 2 turns.
Note: Use the following parts to assemble the purge line: 122-6887 Hose (50 inches), 124-2111 Permanent Coupling, 148-1886 Female Coupler, 4J-5477 O-Ring Seal, and 8C-6866 Connector.
Show/hide tableIllustration 7 g00639450 - Connect the purge line to purge port (1) that is on the ram. Leave the nut on the female end of the purge line in the off position. Place the other end of the hose into a bucket to capture the oil while you purge the system.
Note: Machines that have the older style of track tension cylinder may have both a hose and port for purging. The hose or port is attached to the top of the cylinder.
Show/hide tableIllustration 8 g00639453 - Connect a 8T-0859 Pressure Gauge to test port (5) on the hopper and grade/slope valve.
- Remain clear of the track and start the engine. The ram will quickly move the front idler in the forward direction to put tension on the track.
- Adjust the auxiliary pump pressure compensator to raise the pressure to
16550 kPa (2400 psi) . - Open the female quick disconnect fitting by holding the quick disconnect fitting and turning the purge line. Allow the oil to be purged from the track tension system. The mixture will appear white and the mixture will have foam. The air that is discharging can be felt passing through the hose.
- Shut quick disconnect fitting on the purge line.
- Turn off the engine.
- Turn the engine start switch to the ON position. Do not start the engine.
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Illustration 9 g00639452 - Move tow point control (4) up and down and repeat several times, allowing the pressurized oil to go directly to the hydraulic tank.
- Repeat Step 5 through Step 7 three or four times to ensure that the system is purged.
- When all the air has passed from the ram, start the engine and properly charge the system to
16550 kPa (2400 psi) . - Shut off the needle valve for the oil supply at the manifold.
Note: The maximum torque that should be applied to the needle valve is
13.5 N·m (10 lb ft) . Torquing the needle valve over the maximum torque may result in breakage of the needle valve. - Shut off the engine. Allow the auxiliary system pressure on the gauge in test port (5) of the hopper and grade/slope valve to drop to zero. Disconnect the purge line from the manifold. Disconnect the supply hose at the manifold and replace the dust caps and covers on the quick disconnect fittings.
- Slide the guard that covers the track tension manifold and tighten the cover bolts.
- Start the engine and reset the auxiliary pump pressure back to
14475 kPa (2100 psi) .14475 kPa (2100 psi) is the normal operating pressure of the auxiliary system.
Illustration 6 | g00639451 |