Section 5 – PERIODIC MAINTENANCE
Mini-Crawler Crane M A E D A
5-38 1/2019 MC285C-3
Maintenance Every 250 Hours
Perform this maintenance in tandem with
maintenance every 30/50/100 hours.
Check / Adjust Alternator Belt Tension
Tension Check
1. See “Removing Machinery Cover” on page
5-14 and remove the machinery cover.
2. With fingers, push (by approximately 98 N
{10 kgf}) the midpoint between the fan pulley
(2) and alternator pulley (1) of the belt (3),
and if the strain is between 7 and 10 mm it is
within standard.
Fig. 5-59
Tension Adjustment
1. Insert the bar between the alternator (1) and
cylinder block.
2. Loosen the lower bolt (5) and adjusting bolt
(4).
3. Pull back the bar and slide the alternator (1)
so that the amount of slack (A) of the belt (3)
is about 7 – 10 mm.
Fig. 5-60
Fig. 5-61
4. Tighten the alternator lower bolt and then the
adjusting bolt to secure the alternator (1).
5. Check pulley, V groove and belt for damage
and wear. In particular, make sure that the
belt is not in contact with the bottom of V
groove.
6. If the belt has elongated to the extent that the
adjusting allowance is lost or it has scar or
crack on it, replace it with a new one.
7. When the belt has been replaced, check
adjustment again after one hour of operation.
8. See “Installing Machinery Cover” on page
5-14 and install the machinery cover.
Check / Refill Oil in Travelling Motor
Reduction Gearcase
CAUTION: See “LUBRICATING OIL” on page
5-10 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. 5-62
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.
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