Komatsu H75051, Operation & Maintenance Manual

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PRECAUTIONS FOR SCR ASSEMBLY
Be careful for the high temperature parts when performing inspection and maintenance. Even after the engine
stops the parts around SCR device may be at high temperature.
DUSTY JOBSITES
When working at dusty jobsites, observe the following.
• Clean the radiator fins and other parts of the heat exchange equipment more frequently, and take care not
to let the fins become clogged.
• Replace the fuel filter more frequently.
• Clean electrical components, especially the starting motor and alternator, to avoid accumulation of dust.
• When checking and replacing the oil or filters, move the machine to a place where there is no dust and take
care to prevent dust from entering the system.
AVOID MIXING OIL
Never mix different brand or grade of oil. If a different brand or grade of oil has to be added, drain the old oil and
replace all the oil with the new brand or grade of oil.
LOCK INSPECTION COVERS
Lock inspection cover securely into position with the lock bar, etc. If inspection or maintenance is performed with
inspection cover not locked in position, there is a danger that it may be suddenly shut by the wind and cause
personal injury.
When closing the inspection cover, check that it is not locked with the lock bar, etc. If it is locked and a strong
force is brought to bear on it, there is danger that it may become deformed.
BLEED AIR FROM HYDRAULIC CIRCUIT
When hydraulic equipment is repaired or replaced, or the hydraulic piping is disconnected, the air must be bled
from the circuit. For bleeding air, see “METHOD FOR CHANGING OIL IN HYDRAULIC TANK, CLEANING HY-
DRAULIC TANK STRAINER (4-64)”.
PRECAUTIONS WHEN INSTALLING HYDRAULIC HOSES
• When removing parts at locations where there are O-rings or gasket seals, clean the mounting surface, and
replace them with new parts.
When doing this, be careful not to forget to assemble O-rings and gaskets.
• When installing the hoses, do not twist them or bend them sharply.
If they are installed so, their service life will be extremely shortened and they may be damaged.
CHECKS AFTER INSPECTION AND MAINTENANCE
If you forget to perform the inspection and maintenance, unexpected problems may occur, and this may lead to
personal injury. Always observe the following.
Checks after operation (with engine stopped)
• Have any inspection and maintenance points been forgotten?
• Have all inspection and maintenance items been performed correctly?
• Have any tools or parts been dropped inside the machine? It is particularly dangerous if parts are dropped
inside the machine and get caught in the lever linkage mechanism.
• Are there any leakage of coolant or oil? Have all nuts and bolts been tightened?
Checks while the engine is running
• For details of the checks when the engine is running, see SAFETY, “TWO WORKERS FOR MAINTE-
NANCE WHEN ENGINE IS RUNNING (2-35)” and pay attention to safety.
• Do not run the engine for long hours with the engine hood open. The engine hood may be damaged by
heat of exhaust gas.
• Increase the engine speed to check for the leakage of fuel or oil.
MAINTENANCE PRECAUTIONS FOR MAINTENANCE
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