Doosan L6-60HZ-T4F Operation And Maintenance Manual page 40

Operating & Maintenance Manual
Engine Radiator
Check the coolant level in the radiator. The coolant must cover the tubes in the top tank
(approximately 1 inch high on a clean measuring rod, stuck down filler neck).
Remove pressure cap slowly to relieve pressure from HOT radiator.
Protect skin and eyes. Hot water or steam and chemical additives can
cause serious personal injury.
Tower Cables
Each week the tower lifting cables should be inspected to ensure the ends are attached
securely. The cables should be checked for fraying or other damage and replaced if damaged.
Also, the pulleys should be checked for unusual wear or damage and replaced if worn
excessively or damaged.
Tower Locking Pins
All tower locking pins should be checked weekly. Replace any missing or damaged pins before
lifting the unit or raising the tower.
Tower Guides
Every month, inspect all of the tower guides for proper operation. Clean and lubricate sliding
surfaces. Replace any missing or damaged parts before raising the tower.
Engine Coolant
The engine coolant system is normally filled with a 50/50 mixture of water and ethylene glycol.
This permanent type antifreeze contains rust inhibitors and provides protection to
-35°F (-37°C). The use of such a mixture is recommended for both summer and winter
operation.
When using only water, add a reputable brand of rust inhibitor to prevent internal corrosion to
the cooling system.
It is recommended to test the freezing protection of the coolant every six months or prior to
freezing temperatures. Replenish with a fresh mixture every twelve months.
Each month, inspect the radiator exterior for obstructions, dirt, and debris. If present, blow
water or compressed air containing a non-flammable solvent between the fins in a direction
opposite the normal air flow. Should the radiator be clogged internally, reverse flushing, using
a commercial product and the supplier's recommended procedure, may correct the problem.
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WARNING
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Maintenance