5-20 OM 28Z3 US – Edition 2.0 * * 28Z3b520.fm
Maintenance
5.8 Pilot valve
NOTICE
Possible equipment damage. Dirty oil can damage the piston valves within the
pilot valves.
• Check the pilot control filter every 1000 s/h and cleat it if necessary.
• In order to protect the piston valves in the pilot valves from damage due
to dirt in the oil, check the pilot control filter every 1000 s/h and clean it if
necessary!
Check the pilot valve as follows:
☞ Park the machine on level ground.
☞ Retract the bucket and boom hydraulic cylinders, lower the boom and the bucket teeth
to the ground.
☞ Lower the stabilizer blade to the ground.
☞ Set the boom straight.
☞ Stop the engine.
☞ Move the control levers in all directions repeatedly.
☞ Switch off the starter and remove the starting key.
☞ Fold up the control lever base.
☞ Let the engine cool down.
☞ Slowly open the breather filter.
➥ Release the pressure.
☞ Install the vacuum pump.
☞ Engage the pump before routing the hoses.
☞ Remove the joystick.
☞ Remove the pilot control hose from the joystick.
☞ Remove pilot control filter B from the joystick.
☞ Check pilot control filter screen C for dirt and clean it if necessary. Replace it with a new
filter if it is damaged!
☞ Assemble in the reverse order.
Fig. 128: Pilot valve
C
B
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