Section 5 – PERIODIC MAINTENANCE Mini-Crawler Crane M A E D A
5-52 1/2019 MC405C-3
10. 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.
(3) Allow all the outriggers to be extended,
referring to "OUTRIGGER SETTING" on
page 4-42. Extend and retract the
outrigger cylinder, keeping the machine
down on the ground.
Always stop the outrigger cylinder
approx. 100mm back from the stroke
end when operating the cylinder.
Repeat this task 4 to 5 times.
11. Reattach the machinery cover as described
in "Installing Machinery Cover" on page 5-
18.
Replace Oil in Slewing Reduction Gear
Case
WARNING! The drain plug of the slewing
reduction gear case is located directly
underneath the machine.
Place the outriggers and raise the machine
50mm from the ground to allow a drain pan to
be placed under the machine for draining oil.
If the machine becomes unstable and
wobbles, insert supports under the front and
back of the machine to gain stability.
CAUTION:
• For more information on the which oil to be
used, see "LUBRICATING OIL" on page 5-
14.
• Use seal tape, etc. at the thread of the filler
plug to stop the oil leak and securely
tighten the plug after refilling with the oil.
• Oil drain pan: A 1-litre container
• Quantity of oil for replacement: 0.6L
1. Place the machine on a level surface.
2. See "OUTRIGGER SETTING" on page 4-42
to set the outriggers and raise the machine
from the ground.
Fig. 5-107
WARNING! Check the following before
crawling under the machine:
• Ensure that the outriggers are extended at
the maximum.
• Visually check the level to make sure the
machine in a horizontal position.
• Insert solid blocks between the crawler and
the ground to keep the machine raised.
3. Remove the filler plug (F) from the slewing
reduction gear case.
Fig. 5-108
4. Crawl under the machine and place a drain
pan directly underneath the drain plug (P) of
the slewing reduction gear case to receive
drained oil.
5. Remove the drain plug (P) slowly to drain
the oil, keeping from contact with draining
oil.
6. Check the drained oil. If check finds a
considerable amount of metal powder and
foreign objects, contact our sales service
agency.
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