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Personal injury or death can result from improper accumulator charging. 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 ordering nitrogen gas, be sure that the cylinders are equipped with CGA Number 580 Connections. Do not use color codes or other methods of identification to tell the difference between nitrogen and oxygen cylinders. Never use an adapter to connect your nitrogen charging group to a valve outlet used on both nitrogen, oxygen or other gas cylinders. Be sure you use dry nitrogen (99.8 % purity). |
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Sudden movement of the machine or release of oil under pressure can cause serious injury to persons on or near the machine. To prevent possible injury, perform the procedure that follows before testing and adjusting the hydraulic system. |
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Specifications
| Accumulator Precharge Pressure/Temperature Relationship for the 6550 kPa (950 psi) Steering Accumulators |
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| Temperature | Pressure (1) |
−7 °C (20 °F) |
6005 kPa (871 psi) |
−1 °C (30 °F) |
6060 kPa (879 psi) |
4 °C (40 °F) |
6170 kPa (895 psi) |
10 °C (50 °F) |
6280 kPa (911 psi) |
16 °C (60 °F) |
6390 kPa (927 psi) |
21 °C (70 °F) |
6500 kPa (943 psi) |
27 °C (80 °F) |
6610 kPa (959 psi) |
32 °C (90 °F) |
6720 kPa (975 psi) |
38 °C (100 °F) |
6830 kPa (991 psi) |
43 °C (110 °F) |
6940 kPa (1007 psi) |
49 °C (120 °F) |
6995 kPa (1015 psi) |
| ( 1 ) | Nominal allowable tolerance equals ± 70 kPa (± 10 psi). |
Introduction
The steering system accumulators are mounted on the frame on the left side of the machine
Accumulator Charge Procedure
- Refer to Special Instruction, REHS5464, "Accumulator Discharging and Charging Procedures".
Accumulator Charge Procedure for a Rebuilt Accumulator
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products. Dispose of all fluids according to local regulations and mandates. |
When the accumulator has been rebuilt, the air must be removed from the upper chamber of the accumulator. After the accumulator is rebuilt, put approximately 0.9 L (1 qt) of SAE 10W hydraulic oil in the nitrogen chamber of the accumulator. This oil will be used to help remove the air from the nitrogen chamber of the accumulator. This hydraulic oil also lubricates the top seal of the piston in the accumulator.
Install the rebuilt accumulator on the machine. Refer to Special Instruction, REHS5464, "Accumulator Discharging and Charging Procedures" to charge the rebuilt accumulator.