Doosan 7/26E, Operation And Maintenance Manual

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PERIODICAL INSPECTION AND MAINTENANCE 75
7/26E, 7/31E, 7/41
Inspection every 250 hours operation
(1) Checking and cleaning radiator fins.
Dirt and dust adhering on the radiator fins reduce the cooling
performance, causing overheating. Make it a rule to check the radiator
fins daily and clean as needed.
• Blow off dirt and dust from fins and periphery with compressed air
[0.19MPa (2kgf/cm2) or less] not to damage the fins with compressed
air.
• If contaminated heavily, apply detergent, thoroughly clean and rinse
with tap water shower.
A. Dust, dirt.
B. Radiator fins
C. Air blow
(2) Checking the governor lever and accelerating device.
The governor lever and accelerating devices (accelerating lever,
pedal. etc.) of the machine unit are connected by a fixed linkage to a
pneumatic actuator. If the linkage becomes loose, the deviation in the
position may result and make operation unsafe. Check the linkage
connections for excess play. For adjustment of linkage see compressor
operation section.
Governor Control Seals
As the governor is precisely adjusted, most of the controls are sealed,
please do not break them. Should any adjustment be necessary,
contact your local Doosan branch or distributor.
(3) Replacing fuel filter
Replace the fuel filter at specified intervals before it is clogged with dust
to adversely affect the fuel flow. Also, replace the fuel filter after the
engine has fully been cooled.
1) Remove the fuel filter using a filter wrench(customer procured).
When removing the fuel filter, hold the bottom of the fuel filter with a
piece of rag to prevent the fuel oil from dropping. If you spill fuel, wipe
such spillage carefully.
2) Clean the filter mounting surface and slightly apply fuel oil to the
gasket of the new fuel filter.
3) Install the: new fuel filter manually turning until it comes into contact
with the mounting surface, and tighten it further to 1/2 at a turn, using
a filter wrench. Tightening torque: 11.8~15.6N•m(1.2~1.6kgf•m)
4) Bleed the fuel system. Refer to section 2 of inspection at 50 hours.
IMPORTANT: Be sure to use genuine Yanmar part (super fine mesh
filter). Otherwise, it results in engine damage, uneven engine
performance and shorter engine life.
(4) Changing oil/water separator element.
NOTE: The cartridge and bowl contain fuel. Take care not to spill it
during disassembly and reassembly.
The fuel filter/separator also provides primary filtration and the element
‘C’ should be changed every 500 operating hours or 6 months,
whichever comes first.
Change procedure:
Unscrew the element ‘C’ from the head taking care not to spill fuel
inside the machine. Drain any fuel within into a suitable container, then
unscrew the clear bowl ‘D’ from the element.
Discard the old element into a suitable container.
Remove the old ‘O’ ring from the bowl ‘D’ and install the new one
supplied with the element. Apply a light coat of clean engine oil to the
‘O’ ring and screw the bowl ‘D’ onto the new element ‘C’.
Using a clean cloth, wipe the sealing face of the filter/separator head
to ensure correct seating of the sealing ring.
Fill the element/bowl assembly with clean fuel oil then apply a light coat
of clean engine oil to the new element seal ring.
Screw the new element onto the head firmly by hand.
Follow the “fuel system air bleeding” procedure. see “inspection after
every 50 hours operation” section 2.
(5) Air cleaner element inspection
AIR INTAKE SYSTEM
Air cleaner
Engine performance and life vary with the air intake conditions.
A dirty air cleaner element reduces the amount of intake air, causing
reduced engine output and possible engine damage.
Also, a damaged element leads to abrasion of cylinders and valves,
resulting in increased oil consumption, reduced output and shortened
engine life.
Beware of dirt from air blowing
• Wear-protective equipment such as
goggles to protect your eyes when
blowing compressed air. Dust or flying
debris can hurt eyes.
IMPORTANT: Never use high pressure water or air from close by fins
or never attempt to clean using a wire brush. Radiator fins can be
damaged.
NOTE: The company will not accept any warranty claim on an
engine with broken governor seals.
Applicable fuel filter Part No.
All engines CPN 15892747