Maeda MC285CB-3 - Page 221

M A E D A Mini-Crawler Crane Section 5 – PERIODIC MAINTENANCE
9/2020 MC285CB-3 5-31
4. See “Air Breather Inspection” on page 5-49
and remove the air breather cap (1) from the
oil inlet (F) on the top of the hydraulic oil tank.
Fig. 5-40
5. Place a drain pan directly underneath the
drain port cap (P) to receive drained oil.
Fig. 5-41
6. Remove the drain port cap slowly to drain the
oil, keeping from contact with draining oil.
7. Check the drained oil and if it contains an
unacceptable amount of metal particles or
foreign matter, contact our sales service
agency.
8. Install the drain port cap.
9. Feed hydraulic oil through the filler port to the
level point (red dot) while looking at the oil
level gauge.
Fig. 5-42
10. After replenishing the oil, see “Air Breather
Inspection” on page 5-49 and securely
reattach the air breather cap (1) on the oil
inlet (F).
11. See “Installing Machinery Cover” on page
5-11 and install the machinery cover.
12. 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
4 in. (100 mm) before the stroke end.
Repeat this 4 to 5 times.