Doosan 7/71 - Page 63

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ENGINE MAINTENANCE SCHEDULE
7/71, 12/56
Note:
 This is a recommended maintenance. The failure to perform this maintenance item will not nullify the emission warranty or limit recall liability prior
to the completion engine useful life. Doosan, however, urges that recommended maintenance service is performed at the indicated intervals.
EXPLANATION OF MAINTENANCE SCHEDULE
The following is a brief explanation of the services listed in the preceding Engine Maintenance schedule.
1.
Oil level. Check that the oil level is within cross hatch area (ref fig. 6)
Fill or drain as necessary.
2. Oil leakage check Replace any damaged or malfunctioning parts which could cause leakage.
3. Oil pressure gauge Normal oil pressure is 30 to 85 psi. Check and repair the lubrication system if it is abnormal.
4. Oil pressure warning lamp If it stays on whilst running check and repair the lamp and/or lubrication system.
5. Engine oil replacement Change at 100 hours, then change at 500 hours or 6 months whichever comes first
6. Oil filter element
replacement
Change at 500 hours or 6 months, whichever comes first.
7. Fuel leakage Replace any damaged or malfunctioning parts which could cause leakage.
8. Draining water in fuel
filter/separator.
Drain off water in the fuel filter/separator bowl.
9. Fuel filter element
replacement
Replace both primary (filter/separator) and secondary elements at 500 hours or 6 months whichever come first.
10. Injection nozzle check Check injection opening pressure and spray condition. (This is a recommended maintenance item ). Consult
your local Doosan branch or distributor.
11. Coolant level. Check coolant level and add coolant if necessary.
12. Coolant leakage check Replace any damaged or malfunctioning parts which could cause leakage.
13. Radiator filler cap fitting
condition
The radiator cap must be installed tightly and sealing correctly.
14. Fan belt tension check Check and adjust fan belt deflection. Look for cracks, fraying and wear. Replace if necessary.
15. Coolant temperature Normal running temperature is 75 to 85C (167 to 185F). Check and repair the cooling system if temperature
is abnormal.
16. Coolant replacement Change coolant at intervals of 1000 hours or 12 months, whichever comes first.
17. Radiator external face
cleaning
Check monthly. Clean at intervals of 250 hours or 3 months, whichever comes first. In very dusty environments,
more frequent cleaning might be necessary.
18. Cooling system circuit
cleaning
Clean at intervals of 1000 hours or 12 months, whichever comes first.
19. Radiator filling cap
function check
Check radiator pressure cap periodically for proper operation. Consult your local Doosan branch or distributor.
20. Battery electrolyte level
check
Replenish with distilled water if necessary.