HYDRAULIC SYSTEM MLC300 SERVICE/MAINTENANCE MANUAL
2-22
Published 11-22-17, Control # 257-02
To replace Filter 2, proceed as follows (see Figure 2-18).
1. Stop the engine.
2. Close the Pump 5 shut-off valve (see Figure 2-15
).
3. Take precautions to prevent being burned by hot oil.
4. Place a container below the filter elements to catch
hydraulic oil leakage.
5. Clean the outside of the filter elements and the area
around the filter head.
6. Using a filter wrench, loosen the filter elements.
7. Remove the filter elements and discard them and the oil
leakage according to local environmental regulations.
8. Make sure the seal is securely attached to each new
element.
9. Lubricate the seal on the new elements with clean
hydraulic oil. Do not use grease.
10. Do not fill the new element with oil.
11. Screw the new elements onto the filter housing until the
seals are snug against the head.
12. Tighten each element by hand 1/2 turn more so the seal
is properly seated and the element does not leak.
13. Start the engine and allow the hydraulic system to return
to its normal operating pressure and temperature.
14. Check the filter elements for leaks. Tighten the elements
as required to stop leakage.
15. Open the Pump 5 shut-off valve.
Filter 3
Filter 3 (see Figure 2-19) filters the oil in the flushing circuit
for each travel motor.
On past production cranes, replace the filter element when
the service indicator in the filter head turns red.
On current production cranes, replace the filter
element when the fault alarm comes on and
the Filter 3 icon appears in the Fault Bar of the
main display.
Replace the filter element at each oil change interval, also.
To replace Filter 3, proceed as follows (see Figure 2-19
).
1. Stop the engine.
2. Take precautions to prevent being burned by hot oil.
3. Place a suitable container under the filter element to
catch hydraulic oil leakage.
4. Clean the outside of filter element and the area around
the filter head.
5. Using a filter wrench, loosen the filter element.
6. Remove the filter element and discard it and the oil
leakage according to local environmental regulations.
7. Make sure the seal is securely attached to the new
element.
8. Lubricate the seal on the new element with clean
hydraulic oil. Do not use grease.
9. Do not fill the new element with oil.
10. Screw the new element onto the filter housing until the
seal is snug against the head.
11. Tighten the element by hand 1/2 turn more so the seal is
properly seated and the filter element does not leak.
12. Start the engine and allow the hydraulic system to return
to its operating pressure and temperature.
13. Check the filter element for leaks. Tighten the element
as required to stop leakage.
14. Check the filter element for leaks. Tighten the element
as required to stop leakage.
Filter 4 and 5
See Figure 2-20 for this procedure.
Filter 4 (Drum 2) and Filter 5 (Drum 3) filter the oil to the free
fall brakes.
Replace the filter element when the fault alarm
comes on and the corresponding filter icon,
Filter 4 or 5, appears in the Fault Bar of the
main display.
Replace the filter elements at each oil change interval, also.
NOTE: It is normal for the fault alarm to come on at startup
when the oil is cold. The fault alarm should turn off
FIGURE 2-19
Item Description
1 Filter Head
2Filter Element
Below Center Section of Rotating Bed
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