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3-62
435/485/535
Transmission and Parking Brake Operational
Interaction
The transmission shall neutralize whenever the parking
brake is engaged. A SPDT switch in the parking brake
circuit determines parking brake engagement status.
The transmission will not shift into gear unless the
parking brake status is “OFF”.
Cold Temperature Operations
Upon start-up of the transmission, if the transmission
hydraulic oil temperature is below 20°C, all function
associated with inching, auto-modulation, and shuttle
shift will be limited to F1 and R1.
NOTE: Once the target gear (or direction is achieved)
full gear range is available for normal in gear
operation.
NOTE: Once the transmission oil is at or above 20°C,
the cold oil operation function will be disabled. Once
disabled, it will not be re-enabled until the next ECM
power cycle or if the transmission oil temperature
drops below 18°C.
Shift Inhibits
Transmission overspeed protection: If the transmission
controller detects that a downshift will produce speeds
exceeding the established engine overspeed, the shift
will not be performed. The operator must slow down
the machine by decreasing the throttle or apply the
service brakes before the downshift will occur.
NOTE: Engage a suitable low gear before traveling
downhill.
Inching
When the inching pedal is depressed to less than 6% of
pedal travel (0% being fully depressed), the directional
clutch will immediately disengage (note that the clutch
will partially disengage when the pedal is depressed to
about 35% of travel). Releasing the clutch pedal will
proportionally increase the directional clutch pressure
slowly from zero to a predetermined inching pressure.
When the clutch pedal is fully released (greater than
85% of pedal travel), then the clutch pressure will be
automatically modulated to full pressure. Inching is
used for shifts out of neutral or for maneuvering slowly
for implement hookup.
Section 3 - Operation
Transmission Operation
Before start up
•
Always refer to the Pre-operation Checks and Cab
Features
• Ensure transmission bumpshift lever is in neutral.
• Fully apply parking brake.
•
PTO switch is in the disengaged position (Optional
Equipment)
During initial Start up
During power up the transmission control system
initializes and ensures that the machines does not
move until the direction selector is first moved to
or in neutral and then moved to a non-neutral gear.
Following successful completion of all power-up
function, normal operation is established.
In order to optimize cold weather shifting and
inching performance, the transmission automatically
undergoes a clutch cycling function that engages all
the input clutches one at a time to top pressure. By
doing so, the clutch passages of the input clutches
will be purged of air and will enable better shifting and
inching response when cold. This function will only
activate if the transmission hydraulic oil temperature
is below 30°C at the time of startup.
Upon engine startup, this feature will disengage clutch
8 (Neutral Clutch) and engage the input clutches one
at a time. The parking brake must be engaged in order
for this feature to initiate.
The entire cycle should take about 10 seconds after
the start of the function. During this time, slight
periodic engine lug may be noted. This is normal.
If machine movement is desired immediately after
startup, the operator can cancel the cycling feature by
disengaging the parking brake and shift into gear. The
clutch cycling feature will automatically discontinue
and disengage to allow full transmission control to the
operator.
NOTE: Shifting and inching performance in some
gears may not be optimum if the cycling feature is
interrupted.
NOTE: The clutch cycling feature does not initiate if
there are speed sensor or parking brake faults.