Komatsu D31EX-21, Operation & Maintenance Manual, Page: 230 / 256

SERVICE PROCEDURE
MAINTENANCE
4-50
CLEAN, CHECK RADIATOR FINS AND OIL COOLER FINS 4
WARNING
If compressed air, high-pressure water, or steam hit your body directly, or they cause dirt or dust to be
blown up, there is a hazard of serious injury. Always use safety glasses, dust mask, or other protective
equipment.
NOTICE
When using compressed air for cleaning, blow it keeping some distance to avoid damaging the fins. Dam-
age on the fins can cause water leakage and overheating. In a dusty job site, check the fins every day,
regardless of the maintenance interval.
CLEAN, CHECK RADIATOR FINS
If the radiator fins are clogged or dirty, clean and inspect them.
1. Remove bolts (1) (4 bolts), then remove cover (2).
2. Clean the radiator fins clogged with mud, dust and leaves
with compressed air. Steam or water may be used instead
of compressed air.
REMARK
Check the hydraulic cooler hoses. If any hose is cracked or
hardened by age, replace with a new hose. Also check and
tighten all loose hose clamps.
3. Install cover (2), and tighten bolts (1).
CLEAN, CHECK OIL COOLER FINS
1. Remove cap (3) and then remove cover (4) (provided both
on the left and right) by loosening the mounting bolts.
2. Check the oil cooler fins through the opening of cover (4).
Clean the fins if they are clogged or dirt is found sticking to
them.
3. Blow off the dirt, dust or tree leaves clogging or sticking to
the fins with compressed air. Pressurized steam or water
may be used instead of compressed air.
REMARK
Check the hydraulic cooler hoses. If any hose is cracked or hardened by age, replace with a new hose. Also check
and tighten all loose hose clamps.
4. Fix cover (4) with the mounting bolts.
5. Install cap (3).