DISC ASSEM. 8P4736 - Caterpillar

Illustration 1 g01316743
(1) Transmission Electronic Control Unit (ECU)Note: When a new transmission is put into service the electronic control unit (ECU) must be informed of the type of well servicing application the unit will be placed into. This must also be done when the transmission ECU is reflashed. This procedure is found in Special Instruction, REHS4541, "Software Configuration Guide".The transmission ECU monitors the condition of the machine for proper system operation. Components sense the condition of the machine. Components then send electrical signals to the inputs of the electronic control unit (ECU).Warning Light IndicatorsCaterpillar requires that OEM transmission users install a RED and AMBER operator warning lamps. The lamps may have several locations within the operator's station depending on the OEM's design. The lamps provide an indication of transmission condition.
AMBER Caution LampThe diagnostic lamp is yellow or AMBER. The diagnostic lamp will communicate the status of the transmission electronic system. If the amber lamp is activated, it alerts the operator that a diagnostic condition is active within the transmission. The amber lamp does not require immediate operator attention, but normal operation of the transmission may be affected.
RED Warning LampThe RED warning lamp warns the operator of conditions which require immediate attention. The warning lamp indicates either a transmission oil filter by-pass or an excessive oil temperature. Immediate operator action is required to reduce transmission oil temperature or to service the oil filters.Transmission Control Features
This section describes various transmission control features. Refer to Special Instruction, REHS3514, "Electrical Application and Installation Guide" for more information.Neutralizer (Quick to Neutral)
The Neutralizer Feature, or Quick to Neutral, provides the ability for the operator to quickly shift to neutral. When this switch is activated, the transmission will immediately shift to neutral regardless of operating conditions. Once the transmission is in neutral, the operator must press the "N" button on the shift selector in order to make the desired gear NEUTRAL before the transmission will shift out of neutral. If the desired gear is not NEUTRAL, the transmission will not shift out of neutral.Transmission Gear Lockout
The lock to neutral feature prevents the transmission from shifting out of neutral into forward or reverse. When the transmission is in neutral and the feature is active, the transmission will not shift into forward or reverse when either the "R" or "D" button is pressed. If the transmission is in a gear when the feature is activated, the transmission will inhibit upshifts and allow downshifts until the transmission is in neutral. When the transmission reachesNeutral it will not allow shifts out of Neutral until the feature is deactivated.Starter Interlock Output
The Starter Interlock Output is a 2-amp battery voltage driver. When all conditions are met, the Starter Interlock Output will be enabled when battery voltage is applied to Key Start. The conditions necessary for starting are as follows:
Requested gear from the shifters is neutral
Actual gear is neutral
Engine speed is zeroThe Starter Interlock Output will be disabled once the transmission is no longer in neutral, the shifter is not requesting neutral, or