3-48 SHB 28Z3 EN – Edition 2.0 * 28z3s314.fm
Maintenance
3.16 Pilot valve
Caution!
In order to protect the control spools 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 rams, lower the boom and the bucket teeth to the ground
☞ Lower the stabiliser blade to the ground
☞ Set the boom straight
☞ Stop the engine
☞ Move the control levers in all directions repeatedly
☞ Switch off ignition and remove the ignition key
☞ Fold up the control lever base
☞ Let the engine cool down
☞ Slowly open the breather filter
➥ Release the pressure
☞ Install the vacuum pump
☞ Switch on 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 by a new
filter if it is damaged!
Assemble in the reverse order.
Fig. 56: Pilot valve
C
B
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