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[2] REPLACEMENT HYDRAULIC OIL RETURN FILTER CARTRIDGE
• All the parts will be at elevated temperatures immediately after engine operation, which urges
you not to replace the filter. Always perform replacement with the engine cold.
• Potential gush of oil may occur upon removing the filler cap of the hydraulic oil tank.
Be sure to relieve internal pressure by slowly rotating the filler cap before cap removal.
• Make sure the filler cap is closed properly after replenishment of the oil.
Potential fall of the filler cap during operation may occur if disregarded, which could cause
boiling oil to gush that results in burns.
CAUTION
• See “Maintenance 5.1 Use of Lubricating Oil According to Temperature” for which oil to be
used.
• Place the machine in travel position for oil quantity inspection. Oil quantity inspection with the
machine in working position may deceive your eyes to deem the quantity of oil low. Owing to
improper judgment, the oil may be supplied at an excessive amount.
• The engine must be at halt until piping and hydraulic equipment is filled with oil after
replacement of the hydraulic oil filter.
• Oil replenished should remain below “H” (upper limit) on the level gauge. Excessive oil
replenishment may cause the oil to gush from the air breather during machine traveling and
crane operation, which could result in burns.
• Keep impurities out of the filler cap when replenishing oil.
1. Place the machine on a level surface.
2. See “Operation 2.14 Outrigger Setting Operation” to rotate the
rotary of the “outrigger (1)” and “outrigger (2)” outward.
3. Remove the six mounting bolts (2) and remove the cover
(1).
4. Turn the filter cartridge (3) counterclockwise with the use of the
filter wrench to remove it.
5. Clean the filter stand. Apply clean engine oil (or a light coating of
grease) to the gasket and thread part of a new filter cartridge (3),
and attach the filter cartridge.
NOTES
With the gasket surface maintained contact with the sealing
surface of the filter stand, rotate the filter cartridge one-half to
three-quarters of a turn to secure it.
Always give manual tightening to the filter cartridge.
6. Check around the filter cartridge (3) for oil leaks. Be sure to wipe
off oil completely if spilled.
7. See “Operation 2.1.2 Checking Before Operation” to check the
oil level in the hydraulic oil tank.
Prompt oil refilling is required if check finds insufficient oil.
8. Install the inspection cover (1), and secure it with the six
mounting bolts (2).
9. See “Operation 2.24 Outrigger Stowing Operation” to stow the
outriggers.
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