Cub-cadet RZT-S Zero Electric Manuale Utente

Professional Shop ManualProfessional Shop ManualNOTE: These materials are for use by trained technicians who are experienced in the service and repair

RZT-S Zero63. Remove the brake pedal: See Figure 2.3.3a. Remove the screw that secures the brake pedal to the pedal shaft bell crank using a 1/2” wren

RZT-S Zero96To Start: Sit in seat Starter disable Won't start until condition met.0 volts at pin B3 and B4 Seat switch is not being depressed, po

Electrical System97Blades off: Left Deck Fault Blades off: Right Deck FaultOperator error Disables Blades 2 One or both of the deck motors are pulling

RZT-S Zero98Stopped: Left hub fault / Restart, if problem persists contact serviceFault Disables Blades and Drive 32 Motor hall sensor fault Disconne

Electrical System99Overload: Slow down or raise deckFault Disables Blades and Drive 32768 Instantaneous under volt-ageMomentary drop in bat-tery volt

RZT-S Zero100Stopped: Right hub fault / Restart, if problem per-sists contact serviceFault Disables Blades and Drive 128 POST static gating test Cont

Electrical System101Blades off: Left deck fault Restart, if problem per-sists contact serviceFault Disables Blades 2 Phase over current Motor pullin

RZT-S Zero102Blades off: Left deck fault Restart, if problem per-sists contact serviceFault Disables Blades 2048 Throttle voltage outside rangeN/ABl

Electrical System103Blades off: Right deck fault Restart, if problem per-sists contact serviceFault Disables Blades 16 Controller temperature is ove

RZT-S Zero104Blades off: Right deck fault Restart, if problem per-sists contact serviceFault Disables Blades 16384 POST dynamic gating test Controll

Electrical System105Stopped: Steering sensor fault / Restart, if problem persists contact serviceFault Disables Blades and Drive Steering signal drop

Body76. Remove the lower steering column cover by remov-ing the two screws, indicated by the arrows in Figure 2.6, using a T-30 torx driver.7. Remove

RZT-S Zero106Stopped: Right wheel comm fault / Restart, if problem persists contact serviceFault Disables Blades and Drive 256 (or no code if VCM tim

Electrical System107Stopped: Seat switch fault / Check to see if seat is plugged in / Restart, if problem persists contact serviceFault Disables Blad

RZT-S Zero108

Battery Pack and Charger109Valve Regulated Lead-Acid BatteriesThe Cub Cadet RZT-S Zero uses 4 valve regulated lead-acid (VRLA), absorbed glass mat (AG

RZT-S Zero110Deep cycle batteriesThe RZT-S Zero uses deep cycle batteries. Deep cycle batteries look similar to standard automotive lead-acid batterie

Battery Pack and Charger1111g. Open the charger door on the mower.1h. Measure the voltage across the charger port with a DMM set to the DC volts scale

RZT-S Zero112NOTE: Battery cable corrosion is the most common type of increased resistance circuit failures.NOTE: Lightly coating the battery cable lu

Battery Pack and Charger113Battery testingTypically, there are four major ways to check a battery:• Electrolyte test using a specific gravity tester (

RZT-S Zero114Capacity/discharge testStandard lead acid batteries (starter batteries) are designed to deliver short burst of high current draws. Deep c

Battery Pack and Charger115ChargerThe RZT-S Zero has a 48 volt system. The mower gets 48 volts through four batteries, wired in series. These batterie

RZT-S Zero8Left podRemove the left pod to gain access to the control panel and the charger door switch.To remove/replace the left pod:NOTE: The contro

RZT-S Zero1165-STAGE CHARGENOTE: The 5-state charge and the charger trouble codes sections were extracted from charger’s instruction manual, form numb

Battery Pack and Charger117Charger Trouble CodesUnder normal charge circumstances, the L.E.D.s operate as follows:• Power On (Red) Illuminates conti

RZT-S Zero118Battery removal/installationTo remove/replace the batteries:1. Disconnect the battery pack’s positive lead from the contactor assembly:1a

Battery Pack and Charger1191b. Disconnect the battery pack’s positive lead from the contactor assembly using a 7/16” wrench. See Figure 6.6.2. Disconn

RZT-S Zero1205. Remove the four black shoulder screws that secure the front battery cover to the mower using a T-30 torx driver. See Figure 6.9.6. Re

Battery Pack and Charger12112. Remove the rear battery cover:12a. Remove the two screws at the front of the rear battery cover using T-30 torx driver.

RZT-S Zero12216. Disconnect the jumper wire (green tape) from the two batteries that are standing on end. See Figure 6.15.17. Disconnect the battery c

Battery Pack and Charger123To install the batteries:NOTE: Before installing the batteries, remove the month and year from the label or write the date

RZT-S Zero1249. Insert the battery terminals cover into the slot in the battery tray.NOTE: There is a notch in the cover to allow the battery cables t

Battery Pack and Charger12517. Install the front bracket: See Figure 6.24.17a. Lower the mowing deck to its lowest setting.17b. Slide the front bracke

Body92. Remove the two screws, indicated by the arrows in Figure 2.10, from the underside of the pod using a 3/8” wrench.3. Remove the rear battery

RZT-S Zero12619. Install the front cover using the four black shoulder screws. 20. Install the seat: See Figure 6.24.20a. Set the seat and seat bracke

NOTE: An Authorization is required from Cub Cadet before the batteries can be replaced under warranty. This check list must be performed prior to call

Charger Trouble CodesUnder normal charge circumstances, the L.E.D.s operate as follows:• Power On (Red) Illuminates continuously when AC power is pr

Decks and Lift Shaft129Cutting decksThe RZT-S Zero comes with a 42” floating deck. The deck is made of 13-gauge stamped steel. The deck is NOT a quick

RZT-S Zero130NOTE: Each of the high current connectors coming from the motors are actually three separate connectors that hook onto each other. They c

Decks and Lift Shaft131Cleaning the deckClean debris off of the deck every time the mower is used. It is routine maintenance that will make the deck e

RZT-S Zero132BladesThe condition of the blades will greatly affect the quality of the cut. The blades should be sharpened and bal-anced after every fi

Decks and Lift Shaft1335. Check the blade adapter, motor shaft and hardware for damage: See Figure 7.9.• The end of the motor shaft should not wobble

RZT-S Zero134Leveling the deck For the best quality cut, the deck must be level side to side and the front of the deck should be 1/4” lower than t

Decks and Lift Shaft135Front To Rear (pitch) Leveling1. With the mower parked on a firm, level surface, move the deck to the mid height or most common

RZT-S Zero107. Lift the pod enough to gain access to the charger door switch.8. Disconnect the charger door switch. See Figure 2.

RZT-S Zero136Deck Gauge Wheel AdjustmentThe cutting decks are of a “floating” design. This means that they are suspended above the ground. The gauge w

Decks and Lift Shaft137Deck lift shaft assemblyTo remove/replace a lift shaft: 1. Disconnect the battery pack’s positive lead from the contactor assem

RZT-S Zero138Deck motorTo remove/replace a deck motor:NOTE: Deck motor diagnostics is covered in the troubleshooting section of Chapter 5: Electri-cal

Assembly Instruction ManualA1IMPORTANT: The RZT-S Zero must be assembled by the Cub Cadet dealer prior to delivery to the customer. The Underwriters L

RZT-S ZeroA24. Disconnect the seat switch harness. See Figure 3.5. Remove the seat.6. Slide the steering column cover out from under the steering colu

Assembly Instruction ManualA311. Remove the rear battery cover:11a. Remove the two screws from the front of the rear battery cover using T-30 torx dr

RZT-S ZeroA4NOTE: There are two different height settings the steering column can be mounted at. 17. Lift the steering column to the desired height an

Assembly Instruction ManualA520. Install the deck discharge chute deflector:20a. If attached, remove the ignition key from the chute bracket.20b. Remo

RZT-S ZeroA621a. Insert 1st battery under seat box so that the terminals are down and facing the rear of trac-tor. See Figure 14.21b. Connect the red

Assembly Instruction ManualA721e. Attach the wire with the yellow tape to the nega-tive terminal of 1st battery.NOTE: Tighten the terminal nut to a to

Body11Right podRemove the right pod to gain access to the PTO and key switches.To remove/replace the right side pod:1. Disconnect the battery pack

RZT-S ZeroA821l. Insert the battery terminals cover into the slot in the battery tray.NOTE: There is a notch in the cover to allow the battery cables

Assembly Instruction ManualA922. Install the front bracket:22a. Lower the mowing deck to its lowest setting.22b. Slide the front bracket over the two

RZT-S ZeroA1024. Install the front cover using the four black shoulder screws with a T-30 torx driver. 25. Install the seat:25a. Place the seat on the

Pre- Delivery Check ListRZT-S Zero SERIESELECTRIC MOTORS:RH HUB MOTOR SERIAL NUMBER_____________________LH HUB MOTOR SERIAL NUMBER___________________

NOTES:

MTD Products Inc - Product Training and Education DepartmentFORM NUMBER - 769-08008-0205/2013

RZT-S Zero12SeatTo remove the seat:NOTE: The seat and seat bracket must be removed to remove the seat box top plate or the front battery bracket.1. Sl

Body13Seat box assemblyThe RZT-S Zero has a bolt together seat box assembly. The individual parts of the seat box are serviced sepa-rately, not as one

RZT-S Zero149. Remove the front battery bracket:9a. Lower the mowing deck to its lowest setting.9b. Remove the four screws, indicated by the arrows in

Body15Seat box front main sectionNOTE: There are only two reasons to remove the seat box front main section:• To replace the deck lift shaft• Physical

RZT-S Zero164. Disconnect the negative cable from the master ground bus using a 9/16” wrench. See Figure 2.24.NOTE: The master ground bus has an over

Body1710. Remove the two screws, indicated by the arrows in Figure 2.27, that hold down the front battery tray using a 1/2” wrench. 11. Slide the batt

RZT-S Zero18NOTE: The front main and rear seat box assem-blies can be removed together. If both assemblies are being removed, skip to step 16.15. Remo

Body19NOTE: If the front main seat box assembly is being replaced:• Cut off the speed nuts that attach the seat bracket studs to the front main seat b

RZT-S Zero20Seat box rear sectionTo remove/replace the seat box rear section:1. Remove the batteries by following the procedures described in Chapter

Body213d. Remove the four screws that hold the control panel bracket to the mower using a 3/8” wrench. See Figure 2.37.3e. Lift the control panel and

RZT-S Zero228. Remove the screw that holds the left rear finger guard to the frame using a 1/2” wrench. See Figure 2.40.9. Slide the

Brakes and Drive System23Brake system descriptionThe RZT-S Zero has an electric hub motor that drives a drop axle at each rear wheel. The RZT-S Zero u

RZT-S Zero24Brake adjustment NOTE: When performing a brake adjustment, inspect the brake components for signs of wear or damage.NOTE: Brakes that are

Brakes and Drive System25Brake puck/rotor replacement On RZT-S Zeros, the brake pucks are wearing parts that will need to be serviced from time to tim

IChapter 1: IntroductionProfessional Shop Manual Intent ...1Fasteners...

RZT-S Zero267. Remove the caliper mounting screws using a 3/8” wrench. See Figure 3.7.8. The outboard brake puck should fall out as the brake caliper

Brakes and Drive System2714. Place a new brake puck into the recess in the trans-mission. Use a piece of scotch tape to hold it in place.15. Slide the

RZT-S Zero28Brake shaft assemblyTo remove/replace the brake shaft:.1. Lift and safely support the rear of the mower.2. If the parking brake is set, re

Brakes and Drive System29Drop axle and hub motor assembliesThe drop axle assemblies perform three functions:• The drop axle assemblies are a gearbox t

RZT-S Zero306. Remove the two screws that hold the top of the drop axle mounting bracket to the frame using a 1/2” wrench. See Figure 3.16.7. Disconne

Brakes and Drive System3110. Disconnect the brake shaft return spring. See Figure 3.19.11. Unhook the spring from the drive release rod

RZT-S Zero3215. Remove the two screws that attach the top support plate to the drop axle using a 1/2” wrench. See Figure 3.22.16. Remove

Brakes and Drive System3319. Place the drop axle assembly on a workbench.20. Remove the two screws that hold the motor bracket to the motor using a 1/

RZT-S Zero34Rebuilding the drop axles1. Remove the drop axle by following the procedures described in the previous section of this chapter.2. Remove t

Brakes and Drive System359. Slide the bushing and the bearing off of the drive axle.10. Remove the thrust bearing.11. Remove the nut securing the driv

IISwitch Faults ...88Schematic ...

RZT-S Zero3616. Separate the spur gear from the brake shaft by removing the retaining ring. See Figure 3.34.17. Remove the bearing. See Figure 3.35.18

Brakes and Drive System37NOTE: Apply Loctite #271 or an equivalent thread-locker to the threaded section of the drive axle. Tighten the nut that secur

RZT-S Zero38

Steering39IntroductionThe steering on the RZT-S Zero mower is similar to that of other mowers with Cub Cadet’s Syncro Steer Tech-nology. The Syncro St

RZT-S Zero406. Install a 1/4” alignment pin in the left segment gear. See Figure 4.2. 7. Install a 1/4” alignment pin in the right segme

Steering41Front wheels Remove/ replace the front wheels:1. Lift and safely support the front end of the riding mower.2. Remove the axle bolt and nut u

RZT-S Zero42To replace the front wheel bearings:1. Lift and safely support the front of the mower.2. Remove the front wheel by following the procedure

Steering43Front yokes To remove/ replace the front yokes:NOTE: There is a magnet in the head of the screw that holds the left yoke in place. This scre

RZT-S Zero447. Remove the hex screw using a 9/16” wrench. See Figure 4.12.NOTE: The yoke will slide out as the screw is removed.NOTE: Do not use

Steering45For the Left yoke5a. Install the hex screw with the magnet, lock washer and the fender washer.5b. Apply a small amount of a thread locking c

Introduction1Professional Shop Manual intentThis Manual is intended to provide service dealers with an introduction to the mechanical aspects of the R

RZT-S Zero46Removal of the steering gearsTo remove the steering gears:1. Remove the floor pan, following the procedures described in Chapter 3: Body.2

Steering47NOTE: The same part number gear is used on both yokes. If the gear is to be used on the left yoke, install it so that the LH stamped into th

RZT-S Zero48Installation and timing of the steering gearsTo install and time the steering gears:1. Install the alignment pins by following the proce-d

Steering499. Tighten the hex screw holding the steering gear shaft to a torque of 17 ft lbs (23 Nm).10. Attach the outboard steering gear to the yoke

RZT-S Zero50Drag linksTo remove a drag link:1. Remove the floor pan by following the procedures described in Chapter 3: Body.2. Turn the steering whee

Steering51To install a drag link:1 Install the jam nuts on the new drag link.NOTE: Thread the jam nuts all the way to the unthreaded section of the dr

RZT-S Zero52Steering sensor To remove/replace the steering sensor:NOTE: The function and troubleshooting proce-dures for the steering sensor are cover

Steering535. Remove the nuts and bolts that hold the sensor to the sensor bracket using a #2 Phillips screwdriver and a 1/4” wrench. See Figure 4.34.6

RZT-S Zero5410. Plug the steering sensor into the harness.11. Install the yoke cover:11a. Place the two spacers over the screw holes in the axle casti

Steering55Throttle Position Sensor (TPS) sensorTo remove/replace the TPS:1 Remove the floor pan by following the procedures described in Chapter 2: B

RZT-S Zero2• Be prepared in case of emergency: Keep a fire extinguisher nearby Keep a first aid kit nearby Keep e

RZT-S Zero56Steering and TPS calibrationNOTE: The mower must be calibrated every time:• VCM is replaced• Steering sensor is removed/replaced• TPS is

Electrical System57Introduction The RZT-S Zero has a 48 volt electrical system. This system is an isolated or “fully floating” system. This means that

RZT-S Zero58In this system the VCM is the central computer that controls everything on the mower and acts as the user inter-face for most of the syste

Electrical System59• 150 amp main system fuse: This fuse is in-line on the positive cable, between the battery pack and the control panel. See Figure

RZT-S Zero60• Hub motors: The hub motors are 3-phase, brushless DC motors that are mounted onto a pai r of dr op axles to drive the rear wheels.

Electrical System61• Brake switch: The brake switch is a SPDT switch with one set of contacts that are Normally Open (N.O.) and the other set of conta

RZT-S Zero62• PTO switch: There is a standard PTO switch mounted in the right pod. The switch is used to send a signal to the VCM to turn the deck on

Electrical System63Electric motors The electric motors used on the RZT-S Zero are 3 phase, brushless, DC motors. This type of motor allows for fin

RZT-S Zero64• DC Motor: These motors use DC voltage pulses that will go in one phase as a positive pulse and leave another as a negative pulse. The in

Electrical System65Vehicle Control Module (VCM) 1. Remove the upper steering column cover:1a. Remove the six screws that hold the upper cover to t

Introduction3AssemblyTorque specifications may be noted in the part of the text that covers assembly. They may also be summarized in tables along with

RZT-S Zero66VCM Connector Pin DesignationsPin Name I/O Voltage Current A1 LIGHTS+ Output 12V < 1A A2 LIGHTS- Return 12V < 1A A3 SPEAKER- R

Electrical System67Control panelNOTE: The control panel is serviced as one assembly during the warranty period. Outside of warranty, the individual co

RZT-S Zero682. Remove the left pod by following the procedures described in Chapter 2: Body.3. Disconnect the 12 pin harness connector from the contac

Electrical System697. Disconnect the motor harness connectors. See Figure 5.23.NOTE: Do not disconnect the five wires that go under the co

RZT-S Zero70ControllersTo remove/replace a controllerNOTE: The control panel is serviced as one assem-bly during the warranty period. Outside of warra

Electrical System714. Discharge the pre-charge capacitors.NOTE: Do not use a high impedance test light for this pro-cedure. There is a very high likel

RZT-S Zero72TroubleshootingUnlike all other mowers produced by MTD, the RZT-S Zero has an insulated 48 volt system. This means that the usual methods

Electrical System73No Power/VCM does not light upWhen the key switch is turned on, the VCM should light up. If it does not:1. Open the charger doo

RZT-S Zero747. Remove the VCM by following the procedures described in the Vehicle Control Module (VCM) sec-tion of this chapter.8. Install the harnes

Electrical System75No Start This screen indicates that the VCM is waiting for the operator to start the mower. The VCM will stay at this scre

RZT-S Zero4Model and Serial Numbers The model and serial number tag can be found under the seat. See Figure 1.2.The serial number is located to th

RZT-S Zero76• The VCM has lost communication with the steering sensor.• The VCM cannot understand the signal it is getting from the steering sensor.•

Electrical System773. Rotate the steering wheel while observing the VCM’s screen.A. The steering angle jumps up and down in value:• Check the sensor’s

RZT-S Zero78Throttle Position Sensor (TPS) faultsThe TPS assembly consists of two rotary hall effect sensors that are from the same series as the stee

Electrical System79NOTE: If one or both of the sensors reads “0”, the VCM can not see that sensor(s) because it is either disconnected or the harness

RZT-S Zero80NOTE: If the one or both of the sensors jump from one end of the scale to the other:• Remove the two Phillips headed screws that hold one

Electrical System81Motor faultsTo troubleshoot motor faults:NOTE: When troubleshooting the motors, hub or deck, the procedures are basically the same.

RZT-S Zero823. Test run the mower to verify any faultsNOTE: There are several service screens that will allow the technician to observe the system con

Electrical System836. Depress the down arrow button one time to bring up the base temp. screen. See Figure 5.48.NOTE: The screen shows the temperature

RZT-S Zero84Control panel faultsThe control panel consists of the:• The contactor assembly• The master ground bus• 4 controllers• A communication harn

Electrical System85To determine if the contactor assembly is functioning prop-erly:1. Remove the left pod by following the procedures described in

Body5Floor panRemoving the floor pan will provide access to the steering gears and the throttle position sensor.To remove/replace the floor pan:1.

RZT-S Zero86C. If all of the controllers read battery voltage, the pre-charge voltage is reaching the controllers, but this does not mean that the mas

Electrical System87 The contactor assembly also distributes the VCM’s signals to and from the controllers:• The VCM actually communicates with t

RZT-S Zero88Switch faultsThe VCM sends 5 volts out pin 8 of the 16 pin connector. This 5 volts goes to the:• Charger door switch• Brake switch• TPS as

Electrical System898. With the charger door closed, measure the voltage from pin 7 (- probe) of the 12 pin connector of the VCM to pins 2 and 4 of the

RZT-S Zero903. Inspect the charger door switch connection.4. Turn the key switch to the “ON” position.5. Set a DMM to measure DC volts.6. Back probe t

Electrical System91Brake switchThe brake switch receives 4 - 5 volts through a red wire with a white trace. A brown wire with a white trace carries th

RZT-S Zero92PTO switchThe PTO switch receives 4 - 5 volts at B-Com and C-Com through a red wire with a white trace. When the PTO switch is in the “OFF

Electrical System9311. Remove screws securing the right pod by following the procedures described in Chapter 2: Body.NOTE: Do not remove the pod.NOTE:

RZT-S Zero94SchematicVCMControl PanelBattery+-Battery+-Battery+-Battery+-contactorR DeckL DeckR HubL HubControllerController ControllerControllerSenso

Electrical System95Error codesMessageMessage typeMower's actionCode number (engineering screen)**Trigger Possible causesFor Best Battery Life Avo