Doosan 7/26E, Operation And Maintenance Manual

Page: 72 / 90

68 OPERATING INSTRUCTIONS
7/26E, 7/31E, 7/41
Fig. 17
A. Battery cable
B. Connections
Battery Electrolyte level
The amount of electrolyte in the batteries will be reduced after repeated
discharge and recharge. Check the electrolyte level in the batteries,
replenish with a commercially available electrolyte such as distilled
water, if necessary. The battery electrolyte level checking procedure
will vary with battery type. NOTICE: Do not replenish with dilute sulfuric
acid in the daily service.
CAUTION: When inspecting the batteries, be sure to stop the engine
first.
As dilute sulphuric acid is used as electrolyte, be careful not to
contaminate your eyes, hands, clothes, and metals with the electrolyte.
If it gets in your eye, wash with a large amount of water at once, then
seek medical advice.
As highly flammable hydrogen gas is released from the batteries, do
not create a spark or allow any naked flame near the batteries.
When handling such metallic articles as tools near the batteries, be
sure not to contact the “+” terminal because the compressor body is “-
” and a dangerous short circuit might result.
When disconnecting the terminals, start with “-” terminal. When
connecting them, connect the “-” terminal last.
Fuel level
Check the remaining fuel oil level in the fuel tank and re-fuel if
necessary.
CHECKS AND OPERATION AFTER START-UP
Check after the Engine Start-up
Check the following items in the engine warming-up operation.
Engine noise and exhaust smoke color -
Listen to the engine and, if any abnormal noise is heard, check to
determine the cause.
Check the fuel combustion condition by observing the exhaust smoke
color. The exhaust smoke color after engine warm-up and at no-load
condition should be colorless or light blue.
Black or white smoke indicates incorrect combustion.
Note: After start-up from cold the engine might be noisier and the
exhaust smoke color darker than when it has warmed up. However this
condition will disappear after warm up.
Leakage in the systems -
Check the following items:
Lubrication oil leakage -
Check the engine for oil leaks, paying particular attention to oil filter and
oil pipe joints.
Fuel leakage - Check the fuel injection pump, fuel lines and fuel filter
for leakage.
Coolant leakage - Check the radiator and water pump hose
connections and the water drain cock on the cylinder block for leakage.
Exhaust smoke or gas leakage
Checking coolant level
The coolant level could drop because any mixed air is expelled in about
5 minutes after the engine started.
Stop the engine, remove radiator cap, and add coolant.
CAUTION: Hot steam can rush out and you could get burnt if the
radiator cap is removed when the engine is hot. Cover the radiator cap
with a thick cloth and loosen the cap slowly to reduce the pressure,
then remove the cap.
OPERATION AND CARE OF A NEW ENGINE.
Your engine is carefully tested and adjusted in the factory, however,
further run-in is necessary. Avoid any harsh engine operation within the
initial 100 operating hours.
Do not operate the unit at full load until the engine is warmed-up.
Do not allow the engine to run unloaded for extended periods so as to
minimise the risk of cylinder bore glazing.
During operation, pay attention to the following points if the engine
shows any sign of abnormalities.
(1) Engine Oil Pressure -
The engine oil pressure is monitored by a switch that will stop the
engine if the pressure falls below a pre-set value.
(2) Coolant Temperature -
The engine performance will be adversely affected if engine coolant
temperature is too hot or too cold. The normal coolant temperature is
75 to 85°C (167 to 185°F).
Overheating
CAUTION: If you see or hear escaping steam or have other reason to
suspect there is a serious overheat condition, stop the engine
immediately.
If the Engine Coolant Temperature gage (where fitted) shows an
overheat condition, or you have reason to suspect the engine may be
overheating, take the following step:
• Close the service valve to reduce the load.
• Let the engine run at normal idle speed for two or three minutes. If
the engine coolant temperature does not start to drop, turn off the
engine and proceed as follows:
CAUTION: To help avoid being burned -
• Do not open the canopy or door if you see or hear steam or engine
coolant escaping. Wait until no steam or engine coolant can be seen or
heard before opening the engine canopy or door.
• Do not remove the radiator filler cap if the engine coolant in the
reserve tank is boiling. Also do not remove the radiator filler cap while
the engine and radiator are still hot. Scalding fluid and steam can be
blown out under pressure if either cap is taken off too soon.
If no steam or engine coolant can be seen or heard, open the canopy
or door. If the engine coolant is boiling, wait until it stops before
proceeding. The engine coolant level should be between the “MAX
COLD” and “MIN” marks on the reserve tank.