Mini-Crawler Crane M A E D A Section 5 – PERIODIC MAINTENANCE
1/2019 MC405C-3 5-49
Replace Hydraulic Oil Suction Filter
WARNING!
• 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:
• For more information on the which oil to be
used, see "LUBRICATING OIL" on page 5-
14.
• 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
travelling 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. Remove the machinery cover as described
in "Removing Machinery Cover" on page 5-
18.
3. Remove the eight mounting bolts (4) and
remove the flange (3) on top of the hydraulic
oil tank.
Fig. 5-100
4. Remove the flange (3) and pull out the
suction filter (5) from inside the hydraulic oil
tank.
5. Insert the new suction filter (5) to the inside
of the hydraulic oil tank.
6. Put the flange (3) in place with liquid packing
applied to the rubber plate (6). Secure the
flange (3) with the eight mounting bolts (4).
Fig. 5-101
NOTICE: Wipe off the oil completely if spilled.
7. See "Pre-Start Inspection - Before Starting
Engine" on page 5-24 to check the oil level
in the hydraulic oil tank.
Prompt oil refilling is required if check finds
insufficient oil.
8. Use the following procedure for air bleed.
(1) Start the engine with piping and
hydraulic equipment filled with oil.
Make sure the engine runs at low idle
for 10 minutes.
(2) Move the cylinders and winch motor
slowly with a crane control lever at low
idle speed.
Always stop the boom derricking
cylinder and telescoping cylinder
approx. 100mm back from the stroke
end when operating the cylinders.
Repeat this task 4 to 5 times.
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