CYLINDER BLOCK AS 3489904 - Caterpillar

Table 1
Tools Needed Qty
175-5507 Nitrogen Charging Group 1
8T-0862 Pressure Gauge (−100 to 500 kPa (−15 to 72 psi)) (1) 1
8T-0863 Pressure Gauge (0 to 250 kPa (0 to 36 psi)) (1) 1
(1) The procedure does not require two pressure gauges. Either pressure gauge may be used.Note: Because the accumulator operates with a low pressure, a low pressure gauge is needed for this procedure.Periodic measuring of the accumulator's pressure can help detect wear of the accumulator's seals.If oil leaks past the piston's O-ring seal into the upper portion of the accumulator, the pressure in the upper portion will increase.If nitrogen gas leaks past the piston's O-ring seal into the lower portion of the accumulator, the pressure in the lower portion will decrease. Low pressure can also be caused by nitrogen gas that leaks from the seals for the gas valve and/or for the end caps.Checking the Pressure
Note: The Tool Operating Manual, NEHS0742 is provided with the tool.
Illustration 1 g00995703
Assemble the following parts according to Tool Operating Manual, NEHS0742: nipple (1), needle valve (2), pipe tee (3), coupling (4), low pressure gauge (5), chuck (6) and hose (7). Make sure that needle valve (2) is closed.
Illustration 2 g00995678
Gas valve
Remove the guard and the cap in order to access the gas valve.
Connect chuck (6) to the gas valve. Turn the chuck's handle in order to open the gas valve.
Wait until the low pressure gauge stabilizes. Read the gauge. For the correct pressure, refer to the engine's Specifications manual.If the pressure is correct, proceed to Step 5.If the pressure is too low, proceed to "Charging the Accumulator".
Turn the chuck's handle in order to close the gas valve. Open needle valve (2) in order to purge the nitrogen