3.128 TRANSMISSION
Stall test
A stall test identifies transmission, converter or
engine problems.
Use the following procedure:
1.Put the machine against a solid barrier, such
as a wall and chock the wheels.
2.Put the directional control lever in FORWARD (or
REVERSE as applicable).
3.Select the highest speed.
With the engine running, slowly increase engine
speed to approximately half throttle and hold until
transmission (converter outlet) temperature reaches
the operating range.
Procedures
Do not operate the converter at stall
condition longer than 30 seconds at
one time. Shift to neutral for 15
seconds and repeat the procedure until
the desired temperature is reached.
Excessive temperature, 120°C (250°F),
maximum will cause damage to
transmission clutches, fluid, converter
and seals.
Transmission pressure checks
Transmission problems can be isolated by the use of
pressure tests. When the stall test indicates slipping
clutches, then measure clutch pack pressure to
determine if the slippage is due to low pressure or
clutch plate friction material failure.
Converter charging pressure and transmission
lubrication pressure can also be measured.
Mechanical and electrical checks
Before checking any part of the system for hydraulic
function (pressure testing), the following mechanical
and electrical checks should be made:
! Check the parking brake and inching pedal for
correct adjustment.
! Make sure all lever linkage is properly
connected and adjusted in each segment and at all
connecting points.
! The controls are actuated electrically. Check
the wiring and electrical components.
To Next Page