PLATE AS-HINGE 3606147 - Caterpillar

Probable Causes
Hydraulic oil viscosity is incorrect.
Hydraulic oil level is low.
The hydraulic oil tank has blockage of suction screens.
Problems with the hydraulic hoses or hydraulic lines
The hydraulic oil contains a large amount of air.
The pump has too much wear.Note: Ensure that there are no active diagnostic codes for the hydraulic system.Recommended Actions
Hydraulic Oil Viscosity Is Incorrect
Make sure that the correct viscosity of oil is in the system. Refer to Operation and Maintenance Manual, "Lubricant Viscosities" for your machine.Hydraulic Oil Level Is Low
The hydraulic oil tank has a sight gauge on the outside of the tank. Check the hydraulic oil level with the machine on level ground and the engine OFF. If oil is NOT seen in the sight glass, the hydraulic oil level is low. Refer to Operation and Maintenance Manual, "Hydraulic System Oil Level - Check" on 953D and 963D machines. Refer to Operation and Maintenance Manual, "Hydrostatic Transmission and Hydraulic System Oil Level - Check" on 973D machines. Note: Make sure that the strainer is present in the filler tube before adding the recommended hydraulic oil.If the hydraulic oil level is low, check for oil leakage.The Hydraulic Oil Tank Has Blockage Of Suction Screens
Inspect the main suction tube for blockages. Inspect the main suction tube for any damage that could restrict the volume of oil that is drawn from the tank. (The suction tube draws oil from the bottom of the tank.) Removing the filler cap and the strainer will allow you to view the inside of the tank. It may be necessary to remove the tank in order to inspect the tank for damage. Refer to Disassembly and Assembly, "Hydraulic Tank - Disassemble" and Disassembly and Assembly, "Hydraulic Tank - Assemble" for your machine.Problems With The Hydraulic Hoses or Hydraulic Lines
Kinks or restrictions in hydraulic lines or hoses may act like an orifice that creates excessive noise and heat as the high pressure oil is forced through a passage that is smaller than the original opening.Be sure to check for these conditions on all hydraulic oil hoses, lines, and tubes in the system or the circuit that are in question. Correct any problems that are found. Then retest the hydraulic system for any symptoms.The Hydraulic Oil Contains A Large Amount Of Air
Ensure that the hydraulic oil is not aerated.
Check the return lines to the tank for cracks.
Check all of the fittings and connections for proper torque on the suction side of pumps or on negative pressure side of other motors and other components.
Check the fluid level sight gauge on the side of the hydraulic oil tank. Check the tank for cracks or leaks. If the hydraulic oil appears cloudy, check the inside of the hydraulic oil tank to ensure that the suction tube and the return oil tube are both in place and that both are submerged in the oil (return oil splashing or spraying back into the tank can aerate oil)
Examine implement cylinder rod seals for signs of oil leakage or weeping which may allow