MUFFLER-SPARK ARRESTOR 8I0725 - Caterpillar

Illustration 1 g02632683
(A) Hydraulic oil supply line
(B) Swivel
(C) Hydraulic cylinder
(D) Container In this test, the swivel will be isolated from the hydraulic cylinder. The ports of the swivel near the cylinder will be blocked. A return line from the swivel to the host machine will be opened. Hydraulic oil will be supplied to one side of the swivel. Fluid leakage will be monitored at the open hose in order to determine if the swivel has significant internal leakage.
At operating temperature, the hydraulic oil is hot and under pressure. Hot oils can cause burns.To prevent possible personal injury, release the pressure in the work tool hydraulic circuit (boom, stick, bucket, and swing), travel circuits, and the hydraulic oil tank at the filler cap before any hydraulic lines or components are disconnected or removed.Remove the filler cap only when the engine is stopped and the filler cap is cool enough to touch.
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 operating any compartment or disassembling any component containing fluids.After collecting all fluids in suitable containers, dispose of all fluids according to local regulations and mandates.
Close the shells of the work tool. Place the work tool on the ground and shut off the engine on the host machine. Close the ball valves on the host machine in order to prevent excess oil to the work tool.
Inspect the area around the swivel for exterior leakage. If evidence of external leakage from the swivel is present, replace the seals in the swivel. Refer to Service Manual, "Swivel - Disassemble".
Illustration 2 g02625103
Remove the six bolts and the washers that secure cover (1) to the lower housing. Remove the cover. Repeat this step for the other side of the work tool.
Illustration 3 g02625102
A plate was removed from the lower housing for a clear view of the hose assemblies (2).
Disconnect two hydraulic hoses (2) from the cylinder. Install caps onto the fittings of the cylinders and plug the hoses.
Illustration 4 g02625105
Item (3) indicates the "Close" port of the grapple. A hydraulic hose connects from the ball valve on the stick to this port.
Disconnect hose assembly (3) from the ball valve on the stick. Remove the coupling from the hose in order to allow oil to flow freely from the hose. Place the open end of the hose in a suitable container.
Start the engine of the host machine and operate the machine until the hydraulic oil reaches normal operating temperature.
Open the ball valve that is still connected to the work tool. Activate the control that opens the shells. Observe the open end of hose (3). If there is flow through the hose, the seals of the swivel are faulty. Replace the seals in the swivel. Refer to Service Manual, "Swivel - Disassemble". If there was no flow through the swivel and no external leakage was present, the seals of the swivel do not need replaced. Note: If the