Doosan D55C-9 - Air Intake System - Change; Engine Oil & Filter - Change (with CK-4 Grade Only); Every 1000 Service Hours or 6 Months; Fuel Lines & Fittings - Check

Maintenance Section
-161-
Every 1000 Service Hours or 6 Months
You must read and understand the warnings and instructions contained in the Safety section of this manual, before
performing any operation or maintenance procedures.
Air Intake System - Change
Changing Primary Element
See topic, “Air Intake System - Check, Clean” in “Every
500 Service Hours or 3 Months”.
Changing Secondary Element
Replace the secondary element after the primary
element has been cleaned three times or yearly.
1. Remove the primary air cleaner element. See topic
“Servicing Filter Element”. Clean the inside of the air
cleaner housing and cover.
2. Remove the secondary element. Inspect the gasket
between the air cleaner housing and the engine inlet.
Replace the gasket if it is damaged.
NOTICE
Always replace the secondary element. Do not attempt
to reuse it by cleaning.
3. Install a new secondary element. Install a new or
cleaned primary element. Install the cover. Tighten
the latches.
4. Start the engine and observe the air cleaner service
indicator. If the indicator shows RED after installing a
new secondary element and a cleaned primary
(outer) element, replace the cleaned primary filter
with a new element.
5. Stop the engine. Close the hood and seat assembly.
Fuel Lines & Fittings - Check
Visually inspect fuel lines and fittings for physical damage.
Replace as required.
Engine Oil & Filter - Change (with
CK-4 Grade Only)
See topic, “Engine Oil & Filter - Change” in “First 50-100
Service Hours”.
WARNING
Hot oil and components can cause personal injury.
Do not allow hot oil or components to contact skin.