KIT- 4669232 - Caterpillar

Specifications
Table 1
Charging Pressure for the Accumulator at Different Oil Temperatures
Temperature Pressure
−7° C (20° F) 1550 kPa (225 psi)
−1° C (30° F) 1587 kPa (230 psi)
4° C (40° F) 1618 kPa (235 psi)
10° C (50° F) 1656 kPa (240 psi)
16 °C (60 °F) 1690 kPa (245 psi)
21 °C (70 °F) 1725 kPa (250 psi)
27 °C (80 °F) 1760 kPa (255 psi)
32° C (90° F) 1790 kPa (260 psi)
38° C (100° F) 1830 kPa (265 psi) Introduction
The accumulator supplements power train oil flow in low flow conditions. The accumulator is located underneath the fuel tank at the back of the machine.The following procedure will determine if the accumulator for the power train is charged to the appropriate pressure.Required Tools
Illustration 1 g02726620
Tooling (B)
Table 2
Tool Item Qty Part Number Description
B B1 1 8T-0856 Pressure Gauge
(0 to 6,000 kPa (0 to 870 psi))
B2 1 6V-3989 Fitting
B3 2 6V-4143 Quick Connect Coupler
B4 1 177-7860 Hose As (10 ft) Machine Preparation
Move the machine to a smooth horizontal location.
Lower all of the implements.
Shut off the engine.
Turn the key to the ON position. Make sure that the implement lockout switch is turned to the UNLOCKED position. Move the implement control levers to all positions several times in order to release any pressure in the hydraulic system. Test Procedure (Accumulator Charge Pressure)
Illustration 2 g02155913
(1) Accumulator
(2) Transmission
(3) Valve
(4) Protector
Remove protector (4). Attach tooling (B) to valve (3).
Check accumulator charge pressure at tooling (B). Refer to table 1 for the correct pressure. If the pressure of the accumulator is low, then the accumulator must be charged. Check the accumulator again in order to ensure that the charge is maintained. Charging Procedure for the Accumulator
Pressurized System!Hydraulic accumulators contain gas and oil under high pressure. DO NOT disconnect lines or disassemble any component of a pressurized accumulator. All gas pre-charge must be removed from the accumulator as instructed by the service manual before servicing the accumulator or any accumulator component.Failure to follow the instructions and warnings could result in personal injury or death.Only use dry nitrogen gas to recharge accumulators. See your Cat dealer for special equipment and detailed information for accumulator service and 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 you order nitrogen gas, be sure that the cylinders are equipped with CGA No. 580 Connections. Do not use color codes or other methods of identification to tell the difference between nitrogen and oxygen cylinders.
Gas pressure is variable with the temperature. The accumulator must be at the same temperature as the surrounding air before the accumulator can be charged. Use the following chart for the correct nitrogen charge. Use dry nitrogen.When charging the gas end of a bladder or diaphragm accumulator, the nitrogen gas should always be admitted slowly. If the high-pressure nitrogen