Section 5 – PERIODIC MAINTENANCE
Mini-Crawler Crane M A E D A
5-30 9/2020 MC285CB-3
4. Remove the hose (1) and elbow joint from the
return filter (3).
Fig. 5-39
5. Remove the mounting bolts (2) (4 bolts) and
lift the return filter to pull it out.
6. Apply liquid packing to the rubber plate (4),
mount a new hydraulic oil return filter and
securely tighten the mounting bolts (4 bolts).
7. Reinstall the hose and elbow joint removed in
step 4.
8. See “Check / Add Hydraulic Oil” on page 5-16
and replenish the hydraulic oil.
9. See “Installing Machinery Cover” on page
5-11 and install the machinery cover.
10. Bleed the air according to the following
sequence.
a. Wait until the pipes and hydraulic
equipment are filled with oil before starting
the machine.
b. While keeping the motor speed low,
slightly operate each crane control lever to
operate each cylinder and winch motor
slowly.
Do not operate the boom hoisting cylinder
and telescopic boom cylinder to the stroke
end, but stop them at a position
approximately 100 mm before the stroke
end.
Repeat this 4 to 5 times.
c. Extend the outriggers and make the
outrigger cylinders telescope in the
condition that the machine does not float.
When making the outrigger cylinder
telescope, do not operate it to the stroke
end, but stop it at a position approximately
100 mm before the stroke end.
Repeat this 4 to 5 times.
Maintenance Every 1000 Hours
Replace Oil in Hydraulic Oil Tank
WARNING! Various parts are at elevated
temperatures immediately after machine
operation. Do not change the oil immediately.
Wait until the oil is cooled. (Oil temperature
45°C or lower)
WARNING! Oil may spray out when removing
the air breather cap on the hydraulic oil tank.
Unscrew the cap slightly to relieve the internal
pressure before removing it.
WARNING! Tighten the cap securely after
replenishing the oil. If not fully tightened, the
cap may come loose and fall off during
operation, potentially causing burn injuries if
hot oil spurts out.
CAUTION: See “LUBRICATING OIL” on page
5-7 for the oil to be used.
CAUTION: Be sure to put the machine in the
travelling posture when checking the oil level.
If you check the oil level in the working
posture, you judge the oil level to be low and
feed the oil excessively.
CAUTION: After replacing the hydraulic oil, do
not start the machine for a while until piping
and hydraulic equipment are filled with the oil.
CAUTION: Avoid the oil exceeding the level
point (red point) of the level gauge.
When the oil goes beyond the correct level, it
may spout out from the air breather during
travelling or crane operation.
Be careful not to let any foreign substance go
into the filler opening when refilling the oil.
• Oil drain pan: Prepare a container of at least
25 L.
• Quantity of oil in hydraulic oil tank for
replacement: 20 L
1. Place the machine on a level surface.
2. See “TRAVELLING POSITION” on page 4-29
and put the machine in the “Travelling
posture”.
3. See “Removing Machinery Cover” on page
5-11 and remove the machinery cover.
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