Automatic transmission diagnosis. Effects of incorrect fluid level
Automatic transmission problems can be a result of
poor engine performance, incorrect fluid level, incorrect
linkage or cable adjustment, band or hydraulic
control pressure adjustments, hydraulic system malfunctions
or electrical/mechanical component malfunctions.
Begin diagnosis by checking the easily
accessible items such as: fluid level and condition,
linkage adjustments and electrical connections. A
road test will determine if further diagnosis is necessary. A low fluid level allows the pump to take in air
along with the fluid. Air in the fluid will cause fluid
pressures to be low and develop slower than normal.
If the transmission is overfilled, the gears churn the
fluid into foam. This aerates the fluid and causing
the same conditions occurring with a low level. In
either case, air bubbles cause fluid overheating, oxidation
and varnish buildup which interferes with
valve, clutch and servo operation. Foaming also
causes fluid expansion which can result in fluid overflow
from the transmission vent or fill tube. Fluid
overflow can easily be mistaken for a leak if inspection
is not careful.Automatic transmission diagnosis
Effects of incorrect fluid level
Dodge Durango (DN) 1998-2003 Service Manual
- Lubrication and Maintenance
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- Introduction
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