Form No. 3417-740 Rev A Horizon Control Module For Z Master Lawn Mowers Model No. 74946—Serial No. 402000000 and Up Model No. 74947—Serial No. 40200000 and Up Model No. 74969—Serial No. 400000000 and Up Software Guide Read this information carefully to learn how to operate and maintain your product properly and to avoid injury and product damage. You are responsible for operating the product properly and safely. Read your Operator’s Manual for more information.
No PTO Parking brake Neutral Lock *Located on bottom row of some menu screens Toggle Between Screens Yes Enter/Return Decrease Previous Increase Next Play/Start Reset *Located in top row of Information Screen OPC (Operator Presence Control) Maximum Engine Speed Efficient Engine Speed Hydraulic-Fluid Temperature Pause/Stop Error Warning Recommended Engine Cool Down Time 2 Shut Off Engine
LED Status Light Product Overview The LED status light is multi-colored to indicate the system status and is located on the right side of the panel. During startup, the LED illuminates red, then orange, then green to verify functionality. • Solid Green: indicates normal operating activity. • Blinking Red: indicates that a fault is active. • Blinking Green and Orange: indicates that a clutch reset is required. Buttons g229466 The multi-functional buttons are located at the bottom of the panel.
Engine Screens Engine Speed Mode 3 modes are available: LOW, EFFICIENT, and MAXIMUM. Engine-Off Screen • LOW: Low transport speed/Low idle for reducing deck packing in wet mowing conditions. When the key is on without the engine running, the Engine-Off screen displays (Figure 3). • EFFICIENT: Medium transport speed and maximum fuel economy and normal mowing conditions. • MAX: Maximum transport speed/High idle for extreme mowing conditions.
Menu Selection Screen The Menu Selection Screen displays when you place the motion-control levers in the NEUTRAL-LOCK position and press and hold the 2 outside LDU buttons. g038651 Figure 6 1. Maintenance and Service 2. Gauges and Meters 4. Cancel/Exit 5. Toggle between screens 3. Advanced Settings 6.
• Fuel sender voltage (shows voltage) • Neutral switch (highlights if On) • Brake switch (highlights if On) • Seat switch (highlights if On) • Oil pressure switch (highlights if On) • Engine temperature (shows temperature) g030185 Figure 9 Status of Outputs 1. Current Error 2. Error display (e.g., Low Oil Pressure) This screen lists all of the outputs from the system and highlights which one is currently active. Outputs with numerical values display the current value. 3.
Engine Oil Machine Information This service reminder screen displays the hours until the engine oil maintenance is due. The screen displays the serial number and model number of the machine. g030190 g030188 Figure 15 Figure 12 1. Machine Information 2. Model number 1. Engine Oil 2. Reminder display 3. Serial number 3. Engine hours remaining until the service is due Module Information Press the toggle button to also display the engine hours at which every service reminder reset was performed.
g030193 Figure 18 1. Exit 2. Exit Menu g030203 Figure 20 3. Enter/Return Gauges and Meters Menu Engine Hours (page 8) • PTO Hours (page 8) • Fuel Used (page 8) • Fuel Economy (page 9) • Trip Statistics (page 9) 3. Y (yes) 2. Are you sure? 4. N (no) PTO Hours You can scroll between the following screens in the Gauges and Meters menu: • 1. Reset This screen displays a non-resettable, total PTO hour counter and a resettable trip PTO counter.
Fuel Economy This screen displays the US gallons/liters of fuel used per engine hour. g038364 Figure 25 1. Trip Statistics 1 g038363 Figure 23 1. Fuel Economy 2. Displays engine hours 4. Displays US gallons/liters of fuel 5. Play/Start 3. Displays PTO hours 6. Reset 2. Displays US gallons/liters per hour When a trip statistic is playing, the statistics are not highlighted and the reset button is blacked out and not available. Pressing the pause button stops the collection of data.
Advanced Settings Menu Pressing the reset button brings up a screen asking to confirm the reset reminder. When the advanced settings menu is selected, the module prompts you for a 4 digit passcode. The default digits on the display screen are 0 0 0 0. Hydraulic Trans Oil After performing the necessary maintenance, this screen allows you to reset the number of hours until the hydraulic transmission oil service is due. g030221 Figure 27 1. Enter password 4. Enter/Return 2. Active digits 5.
Alarms Engine Settings The alarms screen allows you to activate and deactivate the audible alarm for individual errors. Press the Enter button to access individual error alarm settings. This screen allows you to adjust the engine speed at the Maximum, Efficient, and Low set points for both transport (clutch disengaged) and mow (clutch engaged) modes in 50 rpm increments. Note: Not all audible alarms can be deactivated. g030227 Figure 33 g030225 1. Engine Settings Figure 31 1. Alarms 2.
Calibrate Engine Settings Factory Defaults This screen allows the calibration of the actual engine speed to match the commanded engine speed. The enter button blacks out if the blades are not disengaged, the parking brake is not engaged, and the motion-control levers are not in the NEUTRAL-LOCK position. Once they are, press the Enter button to start the calibration process. This screen allows you to reset system settings back to the factory default settings.
Adjusting the Electronically-Controlled Low Mode Speed Adjustment When operating in low mow mode, press and hold the Low Speed Mode button reduce the engine speed (minimum of 2250 rpm). Press the Low Speed Mode button again to return the engine to the default setting. Auto Idle Down Mode • If the operator leaves the seat and the safety interlocks allow the engine to remain running, the system enters the auto idle mode and automatically set the engine speed to the low transport speed.
clutch, which allows the machine to be driven onto a trailer or returned to a service area. There are the following errors: 1. Clutch Overcurrent If an overcurrent event occurs, the system limits the engine speed to the Efficient Transport Mode speed and places the machine in Safe Transport Mode. Safe Transport Mode limits the engine speed, locks out the PTO, and disengages the clutch; a Clutch Overcurrent error message will display.
Troubleshooting Issue Description Recommended Corrective Action Blink Red Engine oil service is due. Replace the engine oil and filter. Follow the reset procedure; refer to Engine Oil (page 10). Blink Red Transmission oil service is due. Replace the transmission oil and filter(s). Follow the reset procedure; refer to Hydraulic Trans Oil (page 10). Blink Red Safe Transport Mode—engine limited to Efficient mode and the PTO is disengaged. Engine oil pressure is below limit.
System Error Message Engine Communication Error Module Communication Error Status LED System Actions Blink Red Blink Red Safe Transport Mode—engine limited to Efficient mode and the PTO is disengaged. 16 Issue Description Recommended Corrective Action Communication between the module and the engine ECU has been lost. Check the electrical connections at the module, interconnect between the engine wire harness, and chassis harness. Check the connections at the engine ECU.
