Doosan 7/41 - Page 77

PERIODICAL INSPECTION AND MAINTENANCE 73
7/26E, 7/31E, 7/41
You may choose a position whichever you can most easily carry out
the check and adjustment on the machine unit.
The specified deflection to be measured at each position should be as
follows:
D. Radiator fan
E. Set bolt
F. Alternator
G. Deflection
H. Press with thumb
I. Crankshaft V-pulley
J. V-belt
2) If necessary, adjust the V-belt tension (deflection). To adjust the V-
belt tension, loosen the set bolt and move the alternator to tighten the
V-belt.
3) Visually check the V-belt for cracks, oiliness or wear. If any , replace
the V-belt with new one.
• “New, V-belt” refers to a V-belt which has been used less than 5
minutes on a running engine.
• ”Used V-belt” refers to a V-belt which has been used on a running
engine for 5 minutes or more.
Install the new V-belt adjusting the deflection to the value in the table
below according to the above manner. After adjusting. run the engine
for 5 minutes end readjust the deflection to the value in the table above.
(Adjusting the V-belt tension)
A. Adjust the V-belt tension by prying with a wooden bar
B. Alternator
C. Adjusting bracket
Use of genuine Doosan fan belt
Always use genuine Doosan fan belts as they provide high driving
ability and long operating durability. Use of non-Doosan fan belts could
result in premature belt wear or belt elongation leading to engine
overheating or excessive belt noise.
CAUTION: To help avoid being injured, check and adjust the fan belt
tension with engine stopped.
Inspection every 50 hours operation
(1) Draining of the fuel tank (NOT 7/26E, 7/31E)
1) Prepare a waste oil container.
2) Remove the drain plug of the fuel tank to drain (water, dust ,etc.)
from the fuel tank bottom.
3) Drain until fuel with no water and dust flow out. Then tighten the
drain plug firmly.
(2) Draining of the oil/water separator
Draining Water from Fuel Filter/separator.
The fuel filter/separator is provided to allow water to be drained from
the fuel system. Water is heavier than fuel so any water contained in
the system will collect in the bottom of the bowl.
The clear bowl ‘D’ should be checked on a daily basis and if water is
present, it should be drained from the separator.
Place a suitable container under the separator to prevent any spillage
inside the machine.
Slacken the drain valve ‘E’ until water drains from the vent tube.
When all the water has been evacuated, tighten the drain valve ‘E’ and
follow the “fuel system air bleeding” procedure below.
A B C
10~14mm 7~10mm 9~13mm
A B C
8~12mm 5~8mm 7~11mm