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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.

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..

435/485/535