My John Deere 1520's Hydraulic Is Not Holding

Oil

• Your John Deere 1520's hydraulic system raises and lowers loads using a type of oil specifically designed for hydraulics. This hydraulic fluid is very difficult to compress, so when a pump forces it into the hydraulic lines, it raises the three-point hitch or front-end loader. If the level of the oil in the system falls below a certain point, or if the oil is of the wrong viscosity or contaminated with dirt and water, the pump cannot maintain enough pressure in the lines. Check the level and quality of the oil and replace, if necessary.

Filter

• The hydraulic pump is fitted with a filter to catch contaminants in the hydraulic fluid before they can enter the pump and damage its internal workings. These contaminants include corrosion from inside the system and debris swept inside when fluid is added. Over time, the filter may become clogged with debris to the point that it impedes the flow of oil through the hydraulic system, robbing it of power. Remove and visually inspect the filter regularly, replacing it if it becomes dirty.

Pump

• The pump itself is a delicate piece of machinery that eventually wears out, causing loss of system pressure and hydraulic power. Pumps are particularly prone to damage when used with insufficient or contaminated hydraulic fluid. Oil leakage inside the pump or through its associated control cylinders and valves will require refurbishment or replacement of the damaged part. Due to the intricate nature of the machinery involved, repair requires specific mechanical knowledge and may best be left to a professional mechanic.

Hydraulic Lines

• The hydraulic lines bear the brunt of the pressure in the system, and eventually wear out. While leaks in the lines are easy to diagnose, the lining inside the hose may also separate, impeding the flow of oil through the system. If a hydraulic line becomes clogged, the hydraulics will not work properly. If a small leak allows air into the system, the hydraulics will be noisy and lack power.