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MAINTENANCE
REPLACE HYDRAULIC OIL FILTER ELEMENT
The parts and oil are at high temperature immediately after the engine is stopped, and may cause burns. Wait for the
temperature to go down before starting the work.
When removing the oil filler cap, turn it slowly to release the internal pressure, then remove it.
NOTICE
If the machine is equipped with a hydraulic breaker, the hydraulic oil will deteriorate much faster than during normal bucket
operations. For details, see "MAINTENANCE INTERVAL FOR HYDRAULIC BREAKER (PAGE 4-17)" when carrying out
maintenance.
1. Open up dust cover (1) until it clicks into the securing position.
See "MUD COVER (PAGE 3-28)")
2. Loosen bolt (2), then remove plate (3) to the upper side.
3. Remove the cap from oil filler (F), and release the internal
pressure.
4. Remove bolts (4), then remove cover (5). When this is done,
the cover may fly off under the force of spring (6), so keep the
cover pushed down when removing the bolts.
5. After removing spring (6) and valve (7), take out element (8).
6. Clean the removed parts in diesel oil.
7. Install the new element where old element (8) was installed.
Inspect the O-ring set between the hydraulic tank and cover (5). If there are any scratches, replace the O-ring.
8. Set valve (7) and spring (6) on top of the element.
9. Set cover (5) in position, hold it down by hand, and tighten cover mounting bolts (4) to install cover (5).
10. Extend the boom, arm, and bucket cylinder fully as shown in
the diagram on the right, remove the oil filler cap, then install
the cap and pressurize the inside of the tank.
NOTICE
Be sure to pressurize the hydraulic tank. If it is not pressurized, the pump
will suck in air, and this will adversely affect the equipment.
WARNING
MAINTENANCE PROCEDURE
4 - 61
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