M A E D A Mini-Crawler Crane Section 5 – PERIODIC MAINTENANCE
1/2019 MC285C-3 5-45
CAUTION: A mixing ratio of antifreeze is
recommended to be controlled by the
antifreeze concentration meter.
Antifreeze replacement in the cooling system
should conform to the cycles specified in the
following table.
Cooling system cleaning
and antifreeze replacement
Anti-corrosive
all-season
type
Every other year (in fall) or
every 4000 hours, whichever
falls first
Every year (in fall) or 2000
hours, whichever comes first
Biannually (spring and fall)
Stop the machine on a level place and replace the
antifreeze.
A mixing ratio of antifreeze varies with
temperature. Antifreeze as a volume ratio is min.
30% to yield anticorrosive effect.
A mixing ratio of 50% or more may cause
overheating and damage to sealed parts.
The mixing ratio between water and antifreeze is
to be determined with respect to past minimum
temperatures, in accordance with “Mixing ratio
between water and antifreeze” shown below. For
actual mixing, set temperature approx. 10
degrees lower than minimum temperature.
Mixing ratio between water and antifreeze
(YANMAR coolant)
Min. temperature
(°C)
Mixed quantity (L)
• Antifreeze-mixed water drain pan: A 3-litre
container
• Have a water filling hose available.
1. See “Removing Machinery Cover” on page
5-14 and remove the machinery cover.
2. Turn the radiator cap (3) slowly until it comes
into contact with the stopper to relieve
internal pressure from the radiator.
Fig. 5-79
3. With no pressure in the radiator, give further
turning of the radiator cap until it reaches the
stopper while holding it down. Remove the
radiator cap.
4. Place a drain pan under the drain valve (4)
lying below the radiator to receive coolant
(antifreeze-mixed water).
5. Open the drain valve to drain coolant. Close
the drain valve upon completion of draining.
6. Supply tap water to the radiator through the
radiator supply port. The radiator needs to be
filled up to the supply port.
7. Start the engine with the drain valve (4) open,
and ensure the engine runs at low idle.
Conduct a 10-minute cleaning with running
water.
CAUTION:
• The radiator is to retain a high water level
during cleaning with running water. Adjust
the quantities of water supplied and drained
as necessary.
• Ensure that the water filling hose stays
connected to the radiator supply port
properly during cleaning with running water.
8. After cleaning, stop the engine and water
supply and drain tap water. Close the drain
valve (4) upon completion of draining.
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