M A E D A Mini-Crawler Crane Section 5 – PERIODIC MAINTENANCE
9/2020 MC285CB-3 5-29
Maintenance Every 250 Hours
Check / Refill Oil in Travelling Motor
Reduction Gearcase
CAUTION: See “LUBRICATING OIL” on page
5-7 for the oil to be used.
CAUTION: Use seal tape, etc. at the thread of
the oil inspection plug to stop the oil leak and
securely tighten the plug after
checking/refilling the oil.
1. Move the machine forward and backward so
that drain plug (P) of the travelling motor
reduction gearcase will come to the bottom.
Fig. 5-38
2. Remove the oil inspection plug (G) of the
travelling motor reduction gearcase to check
if the oil comes out of the plug hole.
3. If the oil level is low, refill the gear oil from the
plug hole of the oil inspection plug.
NOTE: Pour in the gear oil until the oil comes out
of the oil inspection plug hole.
4. Securely tighten the oil inspection plug after
checking/refilling the oil.
Maintenance Every 500 Hours
Replace Hydraulic Oil Return Filter
WARNING! Various parts are at elevated
temperatures immediately after machine
operation. Do not replace the filter
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 filter of
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
CAUTION: into the filler opening when refilling
the oil.
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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