• Check the oil level in the tank.
• Replace the dirty&clogged filters.
• Clean the filter through the suction line in the oil tank, if any.
• The hydraulic pump may be sucking air in the suction line, check the suction line pipe and connections.
• Check the ventilation filter.
• Change the hydraulic oil.
• System oil may be cold, check the oil temperature.

• Check hydraulic system fittings, seals.
• The system return line should be below the oil level in the tank, check the tank oil level.
• Change the hydraulic oil.

• Check that the shaft and drive shaft or coupling are in the same center.
• Check the coupling for damage.
• Check the shaft bearing.

Repair or replace it with a new one.

• Check the alignment of the that the shaft and drive shaft or coupling.
• Check the coupling for damage.
• Check the shaft bearing.

Repair should be done.

Please clean, make necessary adjustments, check system conditions and filters.

General maintenance and repair should be done.