Cooling Fan Belt Tensioner - Doosan DX140R Shop Manual

Cooling Fan Belt Tensioner

Maintenance Check
With the engine stopped, check the tensioner arm, pulley and
stops for cracks. If any cracks are found, the tensioner must be
replaced.
With the belt installed, verify that neither tensioner arm stops is
in contact with the spring casing stop. If either of the stops is
touching:
• Verify the correct belt part number is installed.
• If the correct belt is installed, replace the belt. Refer
to "Drive Belt, Cooling Fan" on page-115.
After replacing the belt, if the tensioner arm stops are still in
contact with the spring case stop, replace the tensioner.
Check the location of the drive belt on the belt tensioner pulley.
The belt should be centered on, or close to the middle of, the
pulley. Misaligned belts, either too far forward or backward, can
cause belt wear, belt roll-off failures, or increase uneven
tensioner bushing wear.
Remove the drive belt. Refer to "Drive Belt, Cooling Fan" on
page-115.
With the belt removed, verify that the tensioner arm stop is in
contact with the spring case stop. If they are not touching, the
tensioner must be replaced.
QSB4.5 Engine
Page 114
Figure 189
Figure 190
Figure 191
Figure 192
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