Komatsu D31EX-21, Operation & Maintenance Manual, Page: 183 / 256

MAINTENANCE
GUIDE TO MAINTENANCE
4-3
DUSTY WORKSITES:
When working at dusty worksites, do as follows:
q
Inspect the dust indicator frequently to see if the air cleaner is dirty or clogged.
q
Clean the radiator core frequently to avoid clogging.
q
Clean and replace the fuel filter frequently.
q
Clean electrical components, especially the starting motor and alternator, to avoid accumulation of dust.
q
When inspecting or changing the oil, move the machine to a place that is free of dust to prevent dirt from get-
ting into the oil.
AVOID MIXING OILS:
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. Never mix different brand or grade of oil.
PRECAUTIONS FOR OPENING AND CLOSING ENGINE SIDE COVER:
q
Open the engine side cover all the way and ensure that it is
locked open before letting go.
q
If the lock for the engine side cover is not released, it will
not close. If any attempt is made to close it without releas-
ing the lock, the gas damper may break.
When closing the cover, push the orange button in the cen-
ter of the gas damper (1) to release the lock, then close the
cover.
LOCKING THE INSPECTION COVER:
Lock inspection cover securely into position with the lock bar. If inspection or maintenance is performed with
inspection cover not locked in position, there is a hazard that it may suddenly blown shut by the wind and cause
injury to the worker.
HYDRAULIC SYSTEM-AIR BLEEDING:
After repairing or replacing hydraulic equipment or after removing the hydraulic piping, it is necessary to bleed the
air from the circuit. For details, see “PROCEDURE FOR BLEEDING AIR IN HYDRAULIC SYSTEM (4-34)“.
PRECAUTIONS WHEN INSTALLING HYDRAULIC HOSES:
q
When removing parts at locations where there are O-rings or gasket seals, clean the mounting surface, and
replace with new parts.
When doing this, be careful not to forget to assemble the O-rings and gaskets.
q
When installing the hoses, do not twist or bend them into loops with a small radius.
This will cause damage to the hose and drastically reduce its service life.