Hystat Transmission Features
Two Speed Control
The Two Speed Control shifts the motors between low speed and high speed. The two speed indicator will be illuminated while in high speed.
Creep Control
Creep Control adjusts the maximum speed of the machine. Creep Control will not allow the motors to shift into high speed. The creep control indicator will be illuminated while in creep mode.
Joystick Steering and Speed Control
The joystick steering and speed control is used to determine the left and right track command.
The steering and speed commands will be determined based on the joystick pattern configuration. Pattern "1 " (Cat) joystick mapping uses the left joystick y-axis to determine the speed command and the left joystick x-axis for the steer command. Pattern "2" (alternate) joystick mapping uses the left joystick y-axis to determine the left track command. The right joystick y-axis to determine the right track command. Creep Control, certain Failure Modes, and the desired operation all determine the magnitude of the commands.
Neutral Interlock
The neutral interlock feature prevents the machine from moving until all interlock conditions are satisfied. The neutral interlock feature will bring the machine to stop if certain faults are detected, certain conditions are not maintained during operation, or the parking brake is applied.
Underspeed Control
The underspeed control feature prevents the engine from lugging below a determined speed during high load applications. This action is done in order to optimize machine performance and prevent engine stall.
Fault Management Control
The fault management control feature is used to monitor fault signals in the Hystat system and activate the appropriate fault mode.
Unexpected Motor Speed Detection
The unexpected motor speed detection feature safely disables the hystat system during unexpected motor speed conditions.
Closed Loop Control
The closed loop control provides straight tracking, predictable steering, and unexpected motion control.
Desired Engine Speed Arbitration
The Desired Engine Speed Arbitration feature adds a strategy to arbitrate between two separate throttle inputs to the machine ECM. The machine ECM will determine a requested throttle percentage and a desired engine speed based on the throttle inputs. The arbitration algorithm will treat a hand dial like the master control. The foot pedal will be used to add throttle percentage (if the foot pedal is installed). The foot pedal will be used as a decel pedal once hand throttle is set to 100%
Throttle Auto Calibration
The throttle pedal and hand dial for machines with electronic engine is linear.
The auto-calibration feature adjusts the normal 0% to 100% settings based on the PWM duty cycle from the throttle pedal sensor every time the machine is powered up.
Machine Speed Limit Percentage
This feature enables the operator to configure a maximum machine speed based on a percentage value that is set in the machine configuration.
Implement Control System Features
Auxiliary Tool Control
The purpose of this feature is to provide the operator a means to control the hydraulic oil flow to a tool attached to the front of the skid steer loader. Examples of commonly used tools are multi-purpose buckets, large brooms, grapple buckets, cold planers, and so on.
Bucket Tilt Control
Allows the ECM to control the rackback and dump movement of the loader bucket based on operator input through the x-axis movement of the right control joystick.
Lift Arm Raise/Lower Control
Allows the ECM to control the up and down movement of the loader lift arms based on operator input through the implement control joysticks.
Continuous Flow Control
The purpose of this feature is to provide the operator a means to operate the auxiliary hydraulic circuit continuously without having to actuate the proportional or on/off input. This feature will be used with tools such as a broom or an auger.
Interlock Override Control
The interlock override feature is used with the continuous flow function so the operator can set hydraulic flow to the work tool and then exit the machine to enable the use of tools such as a back hoe attachment or other remote operated implements that have controls external to the cab.
Once the continuous flow feature has been set, pressing and releasing the interlock override switch will activate the interlock override. This action will allow the operator to exit the machine and leave the hydraulic system activated. To discontinue use of the continuous flow feature, the operator must actuate the auxiliary hydraulic input device. Another way is to press and release the continuous flow switch again.
Joystick Pattern Changer
The joystick pattern changer feature allows the operator to select between pattern "1 " (Cat) joystick control and pattern "2" (Alternate) joystick control.
The joystick pattern can be selected through Cat ET. After a pattern is selected, one of the two pattern indicator lamps on the instrument cluster will be illuminated to indicate to the operator what mode the machine controls are in. If a joystick pattern has not been selected, the pattern changer indicator will flash. The parking brake will not release until a pattern has been selected.
If pattern changer is not installed, the machine will default to pattern "1" mapping and no pattern indicator lamp will be illuminated.
Ride Control
Allows the ECM to smooth the ride of the machine by using the combination of the weight of the implement (lift arms and bucket) and an accumulator to act as a shock absorber.
Dual Direction Self Level
The Self Level feature allows the ECM to adjust flow to the tilt cylinders during a lift or lower command to maintain the starting angle of the work tool relative to ground.
The Return-to-Dig function allows the operator to set a predefined bucket angle that the ECM can be triggered to return the lift arms to fully lowered and the bucket to be at that angle.
Work Tool Positioner mode allows the operator to set a predefined bucket angle. The ECM is then triggered to return bucket to be at that angle. The Work Tool does this action without lowering the lift arms.
The Lift Snubbing function provides ECM controlled snubbing at the top and bottom of the lift function.
High Flow System
High Flow XPS and XHP are modes of operation where the implement pump provides greater than standard flow by moving the auxiliary spool past a maximum standard flow setting. The range of the proportional thumbroller will then be scaled to the High Flow XPS or XHP limit as 100% based on which type of work tool the ECM detects through the work tool harness connector.
High Flow XHP mode has the capability of providing up to 120 liters per minute of hydraulic flow. High flow XPS mode is enabled when the pin K on the Work Tool connector is shorted to ground pin B. This action is done either the presence of an XPS work tool or a service jumper harness. Pin K on the Work Tool connector is connected to the ECM at pin J1-45 via the C460 wire.
XHP mode has the capability of providing up to 150 lpm of hydraulic flow. XHP mode is enabled when the pin N on the Work Tool connector is shorted to ground pin B. This action is done either by the presence of an XHP work tool or a service jumper harness. Pin N on the Work Tool connector is connected to the ECM at pin J1-59 via the C481 wire.
For either High Flow XPS or XHP system, buttons to the right of the thumbroller will provide electrical signals to control secondary auxiliary functions (C-/C+) on some work tools equipped with a three-position diverter valve such as mulchers.
For work tools not equipped with auto reversing capability, the primary auxiliary circuit (A1/A2) must be active in order to provide flow to the valve on the work tool. The solenoid coils on the Work Tool valve are controlled by the secondary auxiliary circuits (C-/C+) and divert flow between cylinders on the work tool. Some work tools will feature auto reversing capability which will allow the operation of the secondary auxiliary function (C-/C+) without the primary (A1/A2) circuit active.
Pressing the bottom button (C-) provides an electrical signal to pin C on the Work Tool connector. Pressing the top button (C+) provides an electrical signal to pin D on the Work Tool connector. If the Work Tool is not equipped with auto reversing capability, the primary auxiliary circuit (A1/A2) must be operated simultaneously to produce secondary auxiliary flow. If the Work Tool features auto-reverse functionality and not the primary auxiliary circuit (A1/A2) or continuous flow are commanded, this button will also signal the ECM to drive A1 at the 80 lpm rate to control secondary auxiliary (C-/C+) functions on the Work Tool.
Auto Reverse is enabled in High Flow XPS mode when pin K (ECM J2-45) and pin N (ECM J2-59) on the Work Tool connector are both shorted to ground pin B. Auto reverse is always enabled in XHP mode as pin N (ECM J1-59) on the Work Tool connector is shorted to ground pin B on XHP Work Tools.
Machine System Features
Engine Start Interlock
The purpose of this feature is to provide the operator a means of starting the engine. The feature also adds an extra layer of protection by not allowing the starter to be engaged after the engine has already been started.
Cold Start Aid Control
The cold start aid feature assists with engine cranking during cooler ambient temperatures. The feature may either be an air induction heater located in the air inlet line (models equipped with C3.8) or glow plugs located in the cylinder head (models equipped with C3.3B). On models meeting Tier 4 final emission standards, actuation of either feature is dependent on the coolant temperature and is controlled by the engine ECU. On all models, actuation of the cold start aid is dependent on either coolant temperature or hydraulic oil temperature and is controlled by the machine ECM.
Hydraulic Demand Fan Control
The control system will monitor engine coolant temperature, hydraulic oil temperature, intake manifold temperature, and ambient temperature in order to control and limit the fan speed by proportionally modulating the hydraulic oil pressure to the hydraulic fan bypass valve. This feature is also known as the engine cooling fan. This system will also run at maximum speed during a Diesel Particulate filter (DPF) regeneration cycle. This system will limit minimum fan speed to 1200 RPM anytime the Air Conditioning switch is ON.
Sound Test Mode
During this mode the back up alarm will be disabled and the engine fan speed will be fixed to a specific RPM regulated by sound test requirements. This mode is for regulatory testing only and should never be used as a working mode. This mode will default to NOT ENABLED when the key switch is cycled to prevent accidental usage.
Water in Fuel Sensor
The water in fuel sensor feature detects water in the fuel filter. The water in fuel sensors is located in the filter to allow operator to drain water from the fuel system. The water in fuel sensor is connected to the machine ECM
AC Compressor Protection System
This feature provides protection to the AC compressor by limiting the compressors operation during situations that could damage the compressor. The damaging AC operating environment can be determined by monitoring the AC Low-pressure switch, AC high-pressure switch, and the system voltage.
The compressor relay will be allowed to turn on when Engine RPM is above 900RPMs. This feature will also turn OFF (if previously ON) when the engine speed is below 800RPMs. The compressor does this action to prevent engine stall and compressor operation during cranking, This goes for the hysteresis purposes as well.
