BLOCK 5364657 - Caterpillar

The temperature of the oil is too hot.
Probable Causes
The oil cooler core is plugged or there is low air flow over the core.
The viscosity of the oil is wrong.
The oil level is low.
Oil aeration
The pressure setting on the cooler bypass valve is faulty and the valve is providing low flow to the cooler.
Outside air temperature is too hot.
The implement control valve stem is partially shifted.
The settings for the crossover relief/makeup valve on the steering pump are too low.
The setting on the implement main relief valve is too low.
The pressure cutoff setting for the steering pump is too high.
The pressure cutoff setting for the implement pump is too high.
The setting for the charge pump relief valve is too high.
There is a restriction in an oil passage.
The setting for the implement pump margin pressure is too high.
The implement pump has wear. The steering pump has wear. The steering motor has wear. The pumps make unusual noises with rough steering or rough cylinder movement.
Probable Causes
The viscosity of the oil is wrong.
The steering pump has too much wear. The steering motor has too much wear.
The implement pump has too much wear.
The oil level is low.
Oil aeration from a loose connection or restriction on the inlet side of either the charge pump or the implement pump.
The cylinders and lines are not properly purged of air.
There is either a porous weld or a broken baffle in the hydraulic tank. There is a large amount of air in the oil.
Probable Causes
There is a leak in the oil line from the tank to the pump.
There was a failure to correctly bleed the air from the hydraulic system.
The main implement relief valve is unstable.
The oil level is too low.
There is a broken baffle in the hydraulic tank. There is a loss of oil from the hydraulic system.
Probable Causes
There is leakage through a hole in a hydraulic hose or fitting.
Leakage past the cylinder rod seals.
There is leakage past the seal on the steering pump shaft.
There is leakage past the shaft seal on the implement pump.
There is leakage past the shaft seal on the steering motor.