Form No. 3441-803 Rev A Horizon Control Module For Z Master® Professional 7500-D Series Riding Mowers Model No. 72028—Serial No. 407110000 and Up Model No. 72029—Serial No. 407600000 and Up Model No. 72065—Serial No. 400000000 and Up Model No. 72074—Serial No. 406600000 and Up Model No. 72076—Serial No. 407400000 and Up Model No. 72096—Serial No.
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 Operator Presence Control (OPC) Max Engine Speed Efficient Engine Speed Hydraulic-Fluid Temperature Pause/Stop Error Warning Engine Diesel Particulate Filter Engine Glow Plugs Active 2
Engine DPF Regeneration Inactive/Failed/Interrupted Recommended Engine Cooldown Time Engine DPF Soot Percentage Gearbox-Oil Maintenance Shut Off Engine Product Overview g225792 Figure 1 1. LDU (Logic Display Unit) 3. Key switch 2. Deck-lift switch 4. PTO engagement switch g228164 Figure 2 LDU (Logic Display Unit) 1. Screen 2. LED status light 3 3.
Screen Engine Screens The screen displays icons and information relative to machine operation and is backlit for viewing in low light situations. The screen is located above the buttons. Engine-Off Screen When the key is on without the engine running, the Engine-Off screen displays (Figure 3). Refer to the Screen Icons (page 1) section for icon descriptions. LED Status Light The LED status light is multi-colored to indicate the system status and is located on the right side of the panel.
Engine Speed Mode moves toward the bottom of the display as the engine cools and is empty when it is safe to shut off the engine. If you shut off the engine before the cooldown period has expired, a fault is logged in the historical fault log. 3 modes are available: LOW, EFFICIENT, and MAXIMUM. • LOW: Low transport speed/Low idle for reducing deck packing in wet mowing conditions. • EFFICIENT: Medium transport speed and maximum fuel economy and normal mowing conditions.
g216606 g216638 Figure 5 Figure 7 1. Auto Regen Active 1. Start of Auto Regen If the regeneration is interrupted, the following screen displays: When the engine ECU determines that an auto regeneration is needed, the alarm chirps and the module displays the Start of Auto Regen screen with a 60-second bar graph timer (Figure 5). Once the timer expires, the auto regeneration process begins. Note: No action is required and you can continue to use the machine during the auto regeneration process.
Maintenance and Service Menu by selecting Yes at the prompt. g216641 Figure 11 1. Stationary Regen Required g217322 If you do not perform a stationary regeneration before the timer expires, the engine enters a limp mode and the engine ECU will require a recovery regeneration to be performed. When the module indicates that the engine has entered limp mode, the engine speed and/or power is reduced and it prevents clutch engagement. Figure 9 1. DPF soot percentage 3. Previous 2. Start Regen 4.
time cancels the process and prompts you to engage the parking brake and move the motion-control levers to the NEUTRAL-LOCK position (Figure 14). One of 3 outcomes result: – Complete—if the process completes successfully, the module displays the Regen Complete screen (Figure 17). It includes a 5-minute countdown bar graph. Note: If you take no action and the 5-minute countdown timer on the screen expires, the engine shuts off. g216674 Figure 14 1. Set brake and neutral C.
– Failed—if the engine ECU determines that a recovery regeneration cannot be completed, the module displays the Regen Failed—See Dealer screen (Figure 19). Take the machine to an Authorized Service Dealer. The menu selection screen allows you to cycle through the following screens. • Maintenance and Service Menu (page 9) • Gauges and Meters Menu (page 12) • Advanced Settings Menu (page 14) g216680 Figure 19 g038651 Figure 21 1.
The following are a list of items available in the Status of Inputs screen: • System voltage • Engine communication (highlights if module is communicating with engine ECU) • • • • • • • PTO switch (highlights if pn) Fuel sender voltage (shows voltage) g030185 Figure 24 Neutral switch (highlights if on) Brake switch (highlights if on) 1. Current Error 2. Error display (e.g., Low Oil Pressure) Seat switch (highlights if on) 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. g030188 g030190 Figure 27 Figure 30 1. Engine Oil 1. Machine Information 2. Model number 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 33 1. Exit 2. Exit Menu g030203 Figure 35 3. Enter/Return Gauges and Meters Menu Engine Hours (page 12) • PTO Hours (page 12) • Fuel Used (page 12) • Fuel Economy (page 13) • Trip Statistics (page 13) 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 40 1. Trip Statistics 1 g038363 Figure 38 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 Transmission 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 42 1. Enter password 4. Enter/Return 2. Active digits 5.
Alarms • System Voltage Low 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. • Anti-Stall Engine 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. g030225 Figure 46 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 2,250 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.
speed, locks out the PTO, and disengages the clutch; an Engine Over Temperature message displays. The fault clears once the temperature falls below a safe limit. ◊ Engine Communication Error ◊ Module Communication Error ◊ Clutch Output Failure ◊ Engine Limp Mode Active 6. • In order to protect the system components from When the transmission begins to overheat, the system flashes the transmission temperature bar graph and chirps the audible alarm.
Troubleshooting Issue Description Recommended Corrective Action Blink Red The engine oil service is due. Replace the engine oil and filter. Follow the reset procedure; refer to Engine Oil (page 14). Service the Transmission Oil Blink Red The transmission oil service is due. Replace the transmission oil and filter(s). Follow the reset procedure; refer to Hydraulic Transmission Oil (page 14). Low Oil Pressure Blink Red Safe Transport Mode—engine limited to Efficient mode and the PTO is disengaged.
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. 20 Issue Description Recommended Corrective Action The 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.
