Zetor PRIMO HT 20 NC Operator's Manual
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Zetor PRIMO HT 20 NC Operator's Manual

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PRIMO HT
OPERATOR´S MANUAL
1/2020
1/2020
1/2020
20
Tractor is Zetor. Since 1946.

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Summary of Contents for Zetor PRIMO HT 20 NC

  • Page 1 PRIMO HT OPERATOR´S MANUAL 1/2020 1/2020 1/2020 Tractor is Zetor. Since 1946.
  • Page 2 ZETOR This Operator’s Manual for the Zetor tractors, which we are presenting to you will help you to become familiar with the operation and maintenance of your new tractor. Although many of you have rich experience with the operation of other tractors, please, read the information contained in this Operator’s Manual very carefully.

  • Page 4: Table Of Contents

    CONTENTS Location of serial numbers ..........................7 Product Warranty ............................7 About this manual ............................9 Rops (roll over protection structures) ......................11 Roll-Over Protection Structure (ROPS) ....................... 11 ROPS damage ............................12 Sliding Seat..............................13 How to adjust the seat ..........................13 Safety instructions ............................
  • Page 5 CONTENTS Tips for using the steering wheel with power steering ................53 Implement Lifting Control System ....................... 54 Implement Lowering Speed Control Dial ..................... 55 Cruise Control .............................. 56 Mower deck ..............................57 Preface ................................ 57 Help with Manual Use ..........................57 Use of the Machine ............................
  • Page 6 Checks and Service ........................... 113 General Information ........................... 113 Periodical Check and Service Table ......................114 Fuel, oil and fluid specification diagram....................115 Recommended ZETOR service fillings ..................... 116 Storage and disposal ........................... 117 Tractor Storage ............................117 Short-term Storage ............................ 117 Long-term Storage .............................

  • Page 8: Location Of Serial Numbers

    The manufacturer provides the warranty for this product. The warranty terms are set out in a separate document. After-Sales Service The objective of ZETOR TRACTORS a.s. company is complete customer satisfaction with the purchased product. Any problems with your machine will be solved by your dealer / distributor service department.
  • Page 9 NOTES...

  • Page 10: About This Manual

    Read this Manual carefully and keep it in a convenient place for future reference. If at any time you require advice concerning your Tractor, do not hesitate to contact your Authorized ZETOR dealer / Distributor. He has trained personnel, genuine parts and necessary equipments to undertake all your service requirements.
  • Page 11 NOTES  ...

  • Page 12: Rops (Roll Over Protection Structures)

    ROPS (ROLL OVER PROTECTION STRUCTURES) Roll-Over Protection Structure (ROPS) Zetor tractors are equipped with a frame to protect the operator. On tractors with a cab, this frame is built into the cab structure. The objective of the frame or the cab design is to protect the operator in the event of rolling over, they are designed to support the full weight of the tractor.

  • Page 13: Rops Damage

    ROPS (ROLL OVER PROTECTION STRUCTURES) ROPS damage If the tractor has rolled over or the ROPS has been damaged (for example, by hitting a low overhead object or during transport), the ROPS must be replaced to provide the guaranteed protection. After an accident, check for damage on: 1.

  • Page 14: Sliding Seat

    ROPS (ROLL OVER PROTECTION STRUCTURES) Sliding Seat How to adjust the seat Before operating the tractor, it is important to adjust the seat to the most comfortable position and ensure that it is properly locked in its position. CCL25004 1 - Seat Belt 2 - Forward / Reverse Position Adjustment Lever Warning: Do not place your hand between the seat and the guide rail when adjusting the seat.
  • Page 15 NOTES  ...

  • Page 16: Safety Instructions

    SAFETY INSTRUCTIONS Introduction to safety information This symbol means ATTENTION! YOUR SAFETY IS INVOLVED. The message that follows the symbol contains important information about safety. Carefully read the message. Signal words Danger Warning Caution A signal word - DANGER, WARNING OR CAUTION - is used with safety alert symbol. DANGER identifies the most serious hazards.

  • Page 17: Use Of Rops And Seat Belt

    SAFETY INSTRUCTIONS Use of rops and seat belt The Roll Over Protective Structure (ROPS) has been certified to industry and/or government standards. Any damage or alternation to the ROPS, mounting hard-ware, or seat belt voids the certification and will reduce or eliminate protection for the operator in the event of a roll- over.

  • Page 18: Handle Fuel Safely-Avoid Fires

    SAFETY INSTRUCTIONS Handle fuel safely-avoid fires Handle fuel with care; it is highly flammable. Do not refuel the tractor while smoking or near open flame or sparks. Always stop engine before refueling tractors. Always keep your tractor clean of accumulated grease, and debris.

  • Page 19: Practice Safe Maintenance

    SAFETY INSTRUCTIONS Practice safe maintenance Be thoroughly familiar with the service procedure before performing work. Keep the tractor area clean and dry. Do not attempt to service the tractor while it is in motion. Be careful not to let your body or clothing get into the rotating shaft.

  • Page 20: Prevent Acid Burns

    SAFETY INSTRUCTIONS Prevent acid burns Protect the top of the battery from sparks, flammable materials and open flames. Accumulated battery fumes can explode. Never check the battery charge by connecting the battery terminals with a metal object. Sulfuric acid in the battery electrolyte is hazardous to health.

  • Page 21: Work In Ventilated Area

    SAFETY INSTRUCTIONS Work in ventilated area Do not start the tractor in an enclosed building unless the doors & windows are open for proper ventilation, as tractor fumes can cause sickness or death. If it is necessary to run an engine in an enclosed area remove the exhaust fumes by connecting exhaust pipe extension.

  • Page 22: Safe Operation Of Your Tractor

    SAFETY INSTRUCTIONS Safe operation of your tractor The manufacturer of your tractor has made every effort to make it as safe as is humanly possible. Beyond this point it is the responsibility of the operator to avoid accidents and we ask that you read and implement our suggestions for your safety.

  • Page 23: Mounting And Demounting Implements

    SAFETY INSTRUCTIONS Mounting and demounting implements 1. Ensure that all assembly and disassembly of implements (attachments) is carried out on a secure, level surface. To prevent accidental injuries, ensure that no one is between the tractor and the implement or under the implement. 2.

  • Page 24: The Following Precautions Are Suggested To Help Prevent Accidents

    Do not by-pass the starter safety switch. If the starter safety switch is defective, consult your Zetor tractor dealer/distributor. 4. Avoid accidental contact with the shift lever while the engine is running. Such contact can cause the tractor to move.
  • Page 25 SAFETY INSTRUCTIONS 10. Tow only using the swinging bar or the lower link bar in the lower position. Use only the draw bar pin, which is secured in the correct position. Towing using the tractor's rear axle carriers or any point above the rear axle can cause the front part of the tractor to lift.

  • Page 26: Diesel Fuel

    SAFETY INSTRUCTIONS Operating the PTO 1. When you operate the PTO-powered attachments, stop the engine and wait for the PTO to stop before you leave the tractor and disconnect the equipment. 2. Do not wear loose clothing when operating the PTO or near rotating parts of the connected implement.

  • Page 27: Do's And Don't's

    SAFETY INSTRUCTIONS DO'S AND DON'T'S DO'S-for better performance YES Ensure that protective covers are returned immediately and they are in good conditions. YES Read all operating instructions before operating the tractor YES Perform all maintenance tasks completely and without error. YES Keep the air filter clean.

  • Page 28: Don'ts - For Safe Operation

    SAFETY INSTRUCTIONS Don'ts - for safe operation DO NOT USE the engine with the air filter disconnected. DO NOT START the tractor in a closed building without proper ventilation DO NOT OPERATE the tractor or engine during lubrication or cleaning DO NOT LET the diesel fuel tank run out completely, otherwise the system will need to be bled.
  • Page 29 NOTES  ...

  • Page 30: General Informations

    GENERAL INFORMATIONS Exterior view PRIMOHT20NC_0001 1- Turn Signal Light (R) 2- Fender 3- Tire (Rear) 4- Headlight 5- Tire (Front)
  • Page 31 GENERAL INFORMATIONS PRIMOHT20NC_0002 1-Steering Wheel 2- Hood 3- Headlight 4- Muffler 5- Turn Signal Light (L)
  • Page 32 GENERAL INFORMATIONS PRIMOHT20NC_0003 1- Brake Light 2 - Turn Signal Light...

  • Page 33: Warning Symbols

    GENERAL INFORMATIONS Warning Symbols Safety labels are placed on the tractor to work safely with the machine.  Do not forget to read them and follow the instructions.  Keep safety labels clean and undamaged at all times.  If the safety label on the machine is dirty, wash it with soapy water and wipe with a soft cloth. Never use a solution such as thinner or acetone, as these may erase inscriptions or images.
  • Page 34 GENERAL INFORMATIONS PRIMOHT20NC_0004 1- U.S. Environmental Protection Agency EPA Regulation - Use low sulfur fuel 2 - WARNING - Do not refuel the tractor if you are smoking or if there is an open fire or spark nearby. Always stop the engine before refuelling. 3 - WARNING - Start the engine only when you are sitting in the driver's seat.
  • Page 35 GENERAL INFORMATIONS PRIMOHT20NC_0005 1 - Work in ventilated area 2 - Operation and maintenance manual 3 - WARNING - Do not open the radiator cap while the engine is hot. There is a risk of injury by hot steam. 4 - WARNING - Keep your hands and clothes away from the rotating fan and drive belts to prevent serious injury.
  • Page 36 GENERAL INFORMATIONS PRIMOHT20NC_0006 1 - Beware of the rotary output drive, contact with it can cause fatal injuries. Use protective shields provided for additional equipment. 2 - WARNING - Connect the additional tools or trailers to the tractor only with the prescribed draw bars or hitches.
  • Page 37 NOTES...

  • Page 38: Tractor Controls

    TRACTOR CONTROLS Instruments and Switches PRIMOHT20NC_0007 1 - Tachometer 2 - Cruise Control Switch 3 - Turn Signal Light Switch 4 - Light Switch 5 - Warning Lights Switch 6 - ON/OFF PTO Switch 7 - Key Switch...

  • Page 39: Main Switch

    TRACTOR CONTROLS Main Switch 1 - GLOWING 2 - OFF 3 - ON 4 - STARTING PRIMOHT20NC_0008 It is used to start and stop the engine. 'OFF' Position  In this position, the ignition key can be inserted and removed. When the key is turned to the OFF position when the engine is running, the engine is switched off.

  • Page 40: Tachometer

    TRACTOR CONTROLS Tachometer It displays the engine or PTO speed per minute. PRIMOHT20NC_0009 Hour Meter Displays the total time the machine has been used. The last digit indicates one tenth of an hour (decimal point). If the hour meter is in operation, the indicator light below it flashes.

  • Page 41: Coolant Temperature Indicator Light

    TRACTOR CONTROLS Coolant Temperature Indicator Light 1 - Coolant Temperature Indicator Light PRIMOHT20NC_0012 When the main switch is in the ''ON'' position, the coolant temperature is displayed. If the indicator is in the ''H'' red area while driving, the coolant is overheated. In this case, stop and take all necessary steps referred to in the troubleshooting instructions.

  • Page 42: Combined Switch

    TRACTOR CONTROLS Combined Switch 1- Turn Signal Light Switch 2- Turn Signal Light (R) 3- Turn Signal Light (L) 4- Light Switch PRIMOHT20NC_0013 (1) Light Switch Control The light switch can be operated when the main switch is in the ''ON' position. [OFF] - All lights OFF - Instrument lights, tail lights and low beam lights are ON.

  • Page 43: Indicator Lights

    TRACTOR CONTROLS Indicator Lights PRIMOHT20NC_0015 1- Engine Oil Pressure Warning Light 2- Low Beam Light 3- Left Turn Signal Indicator Light 4- Right Turn Signal Indicator Light 5- PTO Indicator Light 6- Cruise Control Indicator Light 7- Charge Warning Light 8- Preheating Indicator Light 9- Water Temperature Warning Light 10- Fuel Level Warning Light...
  • Page 44 TRACTOR CONTROLS Turn Signal Lights Indicator This light is used to indicate the intended direction of the turn. When the turn signal light switch is pulled down, the turn signal light for turning left begins to flash. When the turn signal light switch is pulled upwards, the turn signal light for turning right begins to flash.
  • Page 45 TRACTOR CONTROLS (8) Engine oil pressure warning light It comes on if the engine oil pressure is insufficient while driving. NOTE When the oil pressure warning light comes on, it indicates a malfunction in the lubrication system.  Immediately check the engine oil and, if necessary, have the vehicle repaired by the service center. Water Temperature Warning Light If this light comes on, the coolant is overheated.

  • Page 46: Pto On / Off Switch

    TRACTOR CONTROLS PTO ON / OFF Switch 1 - PTO ON / OFF Switch PRIMOHT20NC_0027 The PTO ON/OFF switch is located on the right side of the instrument panel and can be easily identified using the integrated yellow indicator light. When the switch is switched on by pressing, the PTO indicator light comes on to indicate that the switch and PTO are in the ON position.

  • Page 47: Controls Operation

    TRACTOR CONTROLS Controls Operation PRIMOHT20NC_0030 1-Steering Wheel 2- Brake Pedal 3- Parking Brake Pedal 4- PTO Shift Lever 5- Fuel Tank Cap 6- PTO Switch 7- Position Regulation Lever 8- Reduced and Road Gears Shift Lever 9- Front Axle Drive Shift Lever (4WD) 10- Travel Speed Control Pedal 11- Joystick 12 - Throttle Lever...

  • Page 48: Throttle Lever

    TRACTOR CONTROLS Throttle Lever 1 - Throttle Lever PRIMOHT20NC_0031 Like the accelerator pedal, it is used to adjust the engine speed Pushing: higher speed Pulling: lower speed Warning: Use only when working in a field. It can lead to excessive acceleration and accident. ...

  • Page 49: Control Pedals

    TRACTOR CONTROLS Control Pedals Travel Speed 1- Travel Speed Control Pedal (Forward) 2- Travel Speed Control Pedal (Reverse) PRIMOHT20NC_0033 When the forward travel speed control pedal is pressed, the forward direction is selected. The reverse direction is selected by pressing the reverse speed control pedal. When the speed control pedal is released, neutral is shifted and the tractor stops.

  • Page 50: Reduced And Road Gears Shift Lever

    TRACTOR CONTROLS Reduced and Road Gears Shift Lever 1- High Speed 2- Neutral 3- Low Speed PRIMOHT20NC_0035 Use the reverse and range shift lever to select the forward or reverse direction.  Use the throttle lever to increase / decrease engine speed. ...

  • Page 51: Differential Lock Pedal

    TRACTOR CONTROLS Differential lock pedal 1 -Differential lock pedal PRIMOHT20NC_0037 The differential lock is a device for locking the differential system so that the left and right wheels rotate at the same speed. This function can be used when the rear wheels are slipping or when only one wheel is turning.

  • Page 52: Front Axle Drive Shift Lever (4Wd)

    TRACTOR CONTROLS Front Axle Drive Shift Lever (4WD) PRIMOHT20NC_0040 The front axle drive shift lever (4WD) is located at the bottom, on the left side of the operator. In the ON position, the front-wheel drive is switched on and it is switched off in the OFF position. Engage and disengage the front axle drive when the front wheels are in the straight position and at low engine rpm.

  • Page 53: Seat And Seat Belt

    TRACTOR CONTROLS Seat and Seat Belt 1 - Seat Position Adjustment PRIMOHT20NC_0041 (1) Seat Position Adjustment The seat may be moved forward and backwards if the seat adjustment lever is pushed to the left. After adjustment, make sure that the seat is firmly secured. (2) Seat Belt Before driving, adjust the length of the belt according to your figure and fasten it in the buckle.

  • Page 54: Pto

    TRACTOR CONTROLS Both rear and mid PTO are designed for variable use. They can be connected simultaneously or individually. If the PTO switch is in the ON position, the engine will not start. If the operator leaves the seat and the parking brake is released and the PTO is switched on, the engine switches off.

  • Page 55: Implement Lifting Control System

    TRACTOR CONTROLS Implement Lifting Control System 1- Position Regulation Lever 2- DOWN 3- UP PRIMOHT20NC_0045 (1) Position Lever This lever is used to lift and lower implements to a certain working height and to maintain this height. Function: Lifting Implements To lift the implement, pull the lever.

  • Page 56: Implement Lowering Speed Control Dial

    TRACTOR CONTROLS Implement Lowering Speed Control Dial 1 - Implement Lowering Speed Control Dial PRIMOHT20NC_0046 This control dial is used to adjust the lowering speed of the implement. Set the lowering speed of the implement according to the type of implement and the working environment. Warning: Under the following conditions, set to the Lock position to prevent the implement from falling: When driving on public roads...

  • Page 57: Cruise Control

    TRACTOR CONTROLS Cruise Control The cruise control function ensures comfortable and efficient operation. When cruise control is on, the indicator light on the instrument panel is on. 1. Turning Cruise Control On (1) Depress the forward speed control pedal until you reach the required speed. (2) Press the cruise control switch to the on position.

  • Page 58: Mower Deck

    MOWER DECK Preface This manual is an integral part of the machine. Before operating the machine, all users must read this manual and they must have access to this manual at all times. The purpose of this manual is to provide information on the safe and proper use of the machine, and the owner or any person operating the machine must read it before using the machine.

  • Page 59: Mower Deck

    MOWER DECK Tractor 1. Before using this machine, it is necessary to read, understand and follow all instructions set out in the manual and on the machine. Failure to do so may result in serious injury or death and damage to the machine.

  • Page 60: Operation In General

    MOWER DECK Operation in General 1. Get familiar with the controls. Read these operator´s manual and the manual provided with your tractor. Learn how to quickly stop a tractor, engine and mower deck in an emergency situation. 2. Ensure sufficient ground clearance before driving under power lines, bridges, tree branches, or when leaving or entering a building.

  • Page 61: Operation On The Slope

    MOWER DECK Operation on the Slope Warning: Slopes are a major factor in losing control of a machine and rollover, which can result in serious injury or death. Driving on slopes requires extreme caution. If the inclination of the slope is greater than 15 degrees, it is not possible to use the tractor, this could result in serious injury or death.

  • Page 62: Operation (1)

    MOWER DECK Operation (1) Warning: To eliminate injuries, make sure that the deflector chute is installed and works properly. Never  use the mower deck unit without a chute or with the chute raised. To eliminate injuries, never direct the discharge of the mowed grass on people in the vicinity ...

  • Page 63: Operation (2)

    MOWER DECK Operation (2) Warning: To eliminate injuries, make sure that the deflector chute is installed and works properly. Never  use the mower deck unit without a chute or with the chute raised. To eliminate injuries, never direct the discharge of the mowed grass on people in the vicinity ...

  • Page 64: Maintenance (1)

    MOWER DECK Maintenance (1) 1. Protect your eyes, wear safety goggles. 2. Never start the tractor inside an enclosed area. The exhaust gases of the engine can be fatal. 3. Always lock the mower deck in the lifted position before maintenance and service. 4.

  • Page 65: Maintenance (2)

    MOWER DECK Maintenance (2) Table of fillings change and service intervals The refence filling change table shows the required maintenance tasks and their intervals. For satisfactory operation of the machine, follow this inspection plan according to the individual indices. No. Checkpoint After Every Every...

  • Page 66: Safety Labels

    MOWER DECK Safety Labels Located on the belt cover on the right and left sides PRIMOHT20NC_0052 Located on the weldment of the mower deck PRIMOHT20NC_0053 Located on the side cover PRIMOHT20NC_0050 Located on the front of the weldment of the mower deck PRIMOHT20NC_0051...

  • Page 67: Information Labels

    MOWER DECK Information Labels Located on the front of the weldment of the mower deck PRIMOHT20NC_0054 Located on the weldment of the mower deck PRIMOHT20NC_0056 Located on the front of the weldment of the mower deck 1- 1/2 CLEARANCE 2- Hole A GROUND PRIMOHT20NC_0055...
  • Page 68 MOWER DECK PRIMOHT20NC_0057...

  • Page 69: Technical Data Of The Middle Mower Deck

    MOWER DECK Technical data of the middle mower deck PRIMOHT20NC_0058 1- 4 WHEELS 2- 7 HOLES 50.8 mm (2 inches) 3- Cutting Height Indicator 4- Universal Joint 5- 290.4 mm (11.4 inches) 6- 874 mm (34.4 inches) 7- 18 mm (0.7 inches) 8- 216 mm (8.5 inches) 9- 1,370 mm (54 inches) 10- 1,689.5 mm (66.5 inches)
  • Page 70 MOWER DECK MM54 MODEL Dimensions Length (mm) 34.4 Width (mm) 66.5 Height (mm) 11.4 Working width (inches) Cutting height (inches) 1 ~ 4 Transport height (inches) Lift link type Lower lift link Cutting height adjustment Cutting height indicator Wheel height Hole 7 EA Gap between hole...

  • Page 71: Lubrication

    MOWER DECK Lubrication Notice: It is not recommended to use pressure cleaning to clean the tractor assembly. High-pressure  water can cause damage to spindles, pulleys, belts or bearings that shorten their service life and reduce uptime. The service life of the mower depends on the maintenance provided.

  • Page 72: Mower Deck Adjustment

    MOWER DECK Mower Deck Adjustment PRIMOHT20NC_0061 Notice: Park the tractor on a firm, flat and horizontal surface, apply the parking brake, stop the engine  and remove the key. 1- Hydraulic Control Lever PRIMOHT20NC_0062 1. Start the engine and move the hydraulic lever backwards to lift the tractor rear link to the highest position.

  • Page 73: Universal Joint

    MOWER DECK 1- Mid PTO Shaft 2- Universal Joint 3- Coupler PRIMOHT20NC_0063 Universal joint 1- A 2- Connection 3- Universal Joint PRIMOHT20NC_0064 1. Pull the universal joint coupler backwards. 2. Push the universal joint on to the shaft of the mid PTO until the coupler is locks. 3.

  • Page 74: Rear Link

    MOWER DECK 1- Rear Link 2- L Pin PRIMOHT20NC_0066 1. Set the cutting height adjustment control to zero inches. 2. Move the hydraulic control lever forward to lower the rear link. Use the L pins to connect the rear link to the mower deck. Front Link 1- (L) 2 - Front Link...

  • Page 75: Front Link Assembly

    MOWER DECK Front Link Assembly PRIMOHT20NC_0069 1- Lever Groove with Pivot Point 2- Front Lever 3 - Front Link 4- Lever with Pivot Point 5- Front Link Bracket 6 - U Pin 1. Place the front lever to the front link bracket. 2.

  • Page 76: Mower Deck Settings

    MOWER DECK Mower Deck Settings 1- Lock Nut 2- Screw PRIMOHT20NC_0070 1- 29 mm ± 3 mm PRIMOHT20NC_0071 Screw and lock nut play: 29 mm ± 3 mm...

  • Page 77: Link Settings

    MOWER DECK Link Settings 1- Checkpoint 2 - Screw 1. The tire pressure must be correct. 2. Move the hydraulic control lever back to lift the rear mower deck to the highest position. 3. Stop the engine and remove the key. 4.
  • Page 78 MOWER DECK 1- (3) Screw 2- L PRIMOHT20NC_0075 1- L 2- F 3- R PRIMOHT20NC_0074...

  • Page 79: Front And Rear Cutting Height Adjustment

    MOWER DECK Front and Rear Cutting Height Adjustment 1 - Hydraulics Control Lever 2- Cutting Height Control PRIMOHT20NC_0076 1- L: Position of measurement of the left blade 2- R: Position of measurement of the right blade PRIMOHT20NC_0077 1- A: Blade height PRIMOHT20NC_0078 1- Screw for precise adjustment of the cutting height 2- H Lock Nut...

  • Page 80: Left And Right Cutting Height Adjustment

    MOWER DECK 1. The tire pressure must be correct. 2. Check that the height of the mower blades is adjusted as shown below. Then tighten the lock nuts tightly. 3. Turn the cutting height adjustment control to ''2.0'' and the anti-scalp roller so that the ground clearance between the rollers and the surface is between 6 and 13 mm (0.25 to 0.5 inches).

  • Page 81: Fasteners Torque Table (Iso)

    MOWER DECK Fasteners torque table (ISO) NOTE If no special torques are specified, use these tightening torques. The values are for UNF threaded bolts, plated or unplated, according to the supplier's delivery. Fasteners can be dry or lubricated with normal engine oil. The values do not apply if graphite, moly-disulfide or other high-pressure lubricant is used.

  • Page 82: Parts Replacement

    MOWER DECK Parts Replacement Danger: A worn or damaged blade may break and a piece of blade may be thrown into the operator's area or on a person in the vicinity, resulting in serious injury or death. Blade Disassembly Release PRIMOHT20NC_0080 Tightening PRIMOHT20NC_0081...

  • Page 83: Belt Replacement

    MOWER DECK Belt Replacement The mower deck belts must be replaced after every 200 hours of operation or if the belts show signs of wear, breakage or other damage. Remove the fasteners that secure the left/right belt cover to the mower deck. Notice: The tensioning arm and tension pulley are under spring tension.

  • Page 84: Transmission

    MOWER DECK Transmission Notice: Prior to operation, make sure that the transmission contains the correct amount of oil. If the oil level is too low or too high, the transmission damage may occur or injury may occur. The oil level must always be checked after 24 hours of operation. After the initial 50 hours of operation, drain the oil and top up the required amount.
  • Page 85 NOTES...

  • Page 86: Operation

    OPERATION Starting the Engine How to Start the Engine 1. Check that there are no obstacles around the tractor. 2. Sit into the operator's seat and check that the parking brake is applied. 3. Make sure that the shift levers and the PTO switch are in neutral position. 4.

  • Page 87: Engine Idling

    OPERATION Engine Idling Engine Idling in General After starting the engine, let the engine idle for 5 to 10 minutes to get the oil to all its parts. NOTE If the engine is loaded immediately after starting, it may stop and get damaged. First, let the ...

  • Page 88: Driving Off, Shifting And Driving

    OPERATION Driving Off, Shifting and Driving Driving Off 1. Lift the implement. 2. Place the main shift lever, range shift lever and direction shift lever in the required position. 3. Release the parking brake by depressing the brake pedal. Warning: The reverse speed is almost the same as the forward speed.

  • Page 89: Tips For Driving On A Slope

    OPERATION Tips for Driving on a Slope 1. Place the main shift lever in a low-speed position on the slope to avoid stopping the engine. 2. Keep the speed low when driving downhill. NOTE If the needle on the coolant temperature gauge points to ''H'', the engine has overheated. If you ...

  • Page 90: Precautions When Driving On The Road

    OPERATION Precautions when Driving on the Road 1. When changing direction on the road, use turn signal lights to inform other drivers of your intention. 2. If you meet a vehicle in the opposite direction in the dark, use the low beam lights. 3.
  • Page 91 NOTES...

  • Page 92: Workflow

    WORKFLOW Safety measures for handling implements 1. When connection and disconnecting implements to the tractor, make sure that there are no people between the tractor and the implement or around the tractor and implements. 2. Only connect and disconnect implements on a safe and flat surface. 3.
  • Page 93 NOTES...

  • Page 94: Maintenance

    MAINTENANCE Covers Opening Hood Opening 1- Hood Unlock Lever PRIMOHT20NC_0088 1. Slide the hook to the side. Then the hood opens with a click sound. 2. Raise the hood with your hands. Then the hood opens automatically and secures with a strut. 1 - Hood PRIMOHT20NC_0089...

  • Page 95: Checked Items

    MAINTENANCE Checked Items To prevent any possible malfunctions, some items must be checked daily. Check before driving. Checked Items Check the individual parts in the following order: 1. Check the parts that had a malfunction the previous day. 2. Walk around the tractor and check: - Proper operation of lights and their possible damage - Proper tire inflation, whether they have cracks, are damaged or worn - Whether the screws and nuts on moving parts are not loose...

  • Page 96: Check And Change Of Coolant

    MAINTENANCE Check and Change of Coolant Check and Change of Engine Coolant 1- Radiator 2- Input 3 - Hoses Check PRIMOHT20NC_0090 1. Check Open the radiator cap and check that the radiator is filled with coolant up to the edge of the filler hole. If the amount of coolant is insufficient, refill.

  • Page 97: Cleaning The Radiator And Radiator Grilles

    MAINTENANCE Cleaning the Radiator and Radiator Grilles 1- Radiator Grille PRIMOHT20NC_0091 When working in a grassy field or working at night, the radiator or condenser grille may become clogged with grass, stalks or insects, which may reduce the cooling capacity. In this case, clean the grille.
  • Page 98 MAINTENANCE (2) Change Unscrew the drain plug at the bottom of the engine to drain contaminated engine oil.  As hot oil comes from the engine, be careful not to burn yourself. After draining the oil, screw the drain plug back on. ...

  • Page 99: Transmission Fluid Check And Change

    MAINTENANCE Transmission Fluid Check and Change 1- Transmission Fluid Filler PRIMOHT20NC_0095 (1) Check Check with the engine stopped. 1. Check the transmission fluid through the sight glass to see if the level is between the upper and lower mark. 2. In case of insufficient amount of oil, refill. 1- Upper Mark 2- Lower Mark PRIMOHT20NC_0096...
  • Page 100 MAINTENANCE (2) Change 1. Unscrew the drain plug at the bottom of the transmission and drain the dirty transmission fluid. As hot fluid comes from the engine first, be careful not to burn yourself. 2. After draining the fluid, tighten the transmission fluid drain plug. 3.

  • Page 101: Front Axle Oil Check And Change

    MAINTENANCE Front Axle Oil Check and Change 1- Front-Wheel Axle Oil Filler 2 - Front Axle Oil Drain Plug PRIMOHT20NC_0098 1- Upper Mark 2- Lower Mark 3- Level Dipstick PRIMOHT20NC_0099 (1) Check 1. Pull out the dipstick, wipe and reinsert. Then pull it out and check that the oil level is between the upper and lower mark.

  • Page 102: Filter And Element Replacement

    MAINTENANCE Filter and Element Replacement Transmission Fluid Filter Element Replacement 1- HST Filter PRIMOHT20NC_0100 1. The hydraulic oil filter is located under the floor. 2. Remove the hydraulic oil filter element by turning it counterclockwise using the wrench. 3. Apply a thin layer of oil to the O-ring of the new element and install the new element by hand tightening.

  • Page 103: Oil Filter Element Replacement

    MAINTENANCE Oil filter Element Replacement 1- Engine Oil Filter Element 2- Engine Oil Dipstick PRIMOHT20NC_0103 1. Remove the engine oil filter element by turning counterclockwise it using the filter wrench. 2. Apply a thin layer of oil to the O-ring of the new element and install the new element by hand tightening.

  • Page 104: Fuel System

    MAINTENANCE Fuel System Use only low or ultra low sulfur diesel. (1) Fuel Tank 1- Fuel Tank Cap NOTE If objects or materials, such as dust, sand, or water, are present in the fuel, it may degrade the  performance of the fuel pump. Ensure that high-quality fuel is supplied through the dirt trap. 1 - Bleed Screw PRIMOHT20NC_0105 (2) Fuel System Bleeding...

  • Page 105: Check And Cleaning Of The Air Filter

    MAINTENANCE Check and Cleaning of the Air Filter Follow these instructions to check and clean the air filter: 1- Air Filter Element PRIMOHT20NC_0106 Vacuum Valve Cleaning Pull out the valve by hand and clean the inner part with your hand. ...

  • Page 106: Lubrication Points

    MAINTENANCE Lubrication Points For general lubrication points, see fuel, oil and fluid specification diagram. If the tractor is to be used for work in a wet field, apply lubricant before use. Lubricating Arm To access the lubrication point, remove the rubber covers on the floor and instrument panel. Refill lubricant with the supplied grease gun.

  • Page 107: Recharge

    MAINTENANCE Recharge 1. Turn the ignition switch to the 'OFF' position and disconnect the battery from the tractor. 2. Recharge the battery in a well-ventilated area. 3. Charge the battery in the normal way, do not use fast-charging. 4. Turn the charging switch to the OFF position and connect correctly the cables to the negative and positive terminals of the battery.

  • Page 108: Electric Connection Check

    MAINTENANCE Electric Connection Check (1) Loose wire connections may cause contact failure and damaged wiring can lead to degraded electrical equipment performance, short circuit and fire. Replace or repair damaged wiring. (2) If the cable insulation is damaged, wrap it with insulating tape. (3) If the fasteners or cable ties are damaged, secure the cables with clamps.

  • Page 109: High Capacity Fuse (50 A)

    MAINTENANCE High Capacity Fuse (50 A) 1- High Capacity Fuse PRIMOHT20NC_0112 For electrical wiring, the tractor is equipped with three fuses. To protect the electrical circuit, the fuses will blow and the power supply will be disconnected. Determine the cause of the blown fuses and replace them with the original spare ones. Check 1- Normal Condition 2- Open Circuit...

  • Page 110: Check And Adjustment Of Parts

    MAINTENANCE Check and Adjustment of Parts Check and Adjustment of Brake Pedal 1- Lock Nut 2- Swivel Buckle PRIMOHT20NC_0114 If the brake pedal is used for a long time, its play increases. If the paly is too large, adjust it. Adjustment 1.

  • Page 111: Check And Adjustment Of The Fan Belt

    MAINTENANCE Check and Adjustment of the Fan Belt 1- Mounting Screw 2- Fan Belt 3- 0.28 ~ 0.35 in (7 ~ 9 mm) PRIMOHT20NC_0116 Check and adjust the fan belt tension regularly. 1. Loosen the alternator retaining screw and slide the alternator to adjust the tension. 2.

  • Page 112: Check Of Air Filter Hose

    MAINTENANCE Check of Air Filter Hose 1 - Air Filter Hose 2- Clamp PRIMOHT20NC_0118 Check the air filter hose as follows: 1. Stop the engine. After the engine has cooled down sufficiently, open the hood. 2. Check the air filter hose for damage or leaks. Replace, if necessary.

  • Page 113: Tire Inflation Pressure

    MAINTENANCE Tire Inflation Pressure 1- Insufficient Pressure 2- Normal Pressure 3- Excessive pressure PRIMOHT20NC_0120 Check that the pressure in the front and rear tires is correct. If not, adjust according to the specification. Tire Normal Pressure (kg/cm²) / psi Item Specification Turf Front TURF F 18X8.50-10...

  • Page 114: Checks And Service

    Further engine oil changes, always after another 250 hours of operation, but no later than 12 months after the previous service inspection. Performing service inspections is part of tractor maintenance. Authorized Zetor services will provide you with professional inspections according to the manufacturer's instructions.

  • Page 115: Periodical Check And Service Table

    MAINTENANCE Periodical Check and Service Table Notice: Only check or adjust parts with the engine stopped.  If a service operation is required on a hot part, wait for it to cool down.  Caution: These intervals are for operation under normal conditions and need to be reviewed under severe conditions to a greater frequency.

  • Page 116: Fuel, Oil And Fluid Specification Diagram

    MAINTENANCE Fuel, oil and fluid specification diagram. 1 - Engine Oil Check Hole 2 - Transmission Oil Drain Hole 3 - Engine Oil Check Hole 4 - Engine Oil Filler 5 - Drain Plug 6 - Front Axle Oil Filler 7 - Lubrication Point 8 - Engine Oil Filler 9 - Engine Oil Drain Hole...

  • Page 117: Recommended Zetor Service Fillings

    Diesel EN 590 25 (6.6) Recommended ZETOR service fillings Engine - ZETOR 10W-40 L-SAPS Transmission - ZETOR EXTRA 10W-30 STOU (hydraulic gearboxes, summer operation) - ZETOR HM 32 (winter operation) Front axle - ZETOR LS 80W Plastic lubricant - MOGUL LA 2...

  • Page 118: Storage And Disposal

    STORAGE AND DISPOSAL Tractor Storage Short-term Storage (1) Store the tractor after it has been cleaned. Clean the tractor especially carefully after working with harrows or working in a wet field. (2) Make sure you have lowered the implement. (3) If possible, store the tractor indoors. (4) If you store the tractor outdoors, cover it.

  • Page 119: Use After A Long Downtime

    STORAGE AND DISPOSAL Use after a Long Downtime Storage After long-term storage, it is recommended to follow the instructions below when using the tractor. (1) Check the tractor thoroughly before driving. (2) To maintain good performance and long service life, let the engine idle for about 30 minutes after starting. NOTE To lubricate the engine, run the engine once a month for 5 to 10 minutes at 1,500 to 2,000 rpm.

  • Page 120: Troubleshooting

    TROUBLESHOOTING Engine Faults FAULT PROBABLE CAUSE SOLUTION Set the PTO switch to OFF  PTO switch set to ON position  position Have it repaired by an authorized  Defective safety switch  service The starter Dead battery Charge the battery ...

  • Page 121: Engine Faults

    TROUBLESHOOTING Engine Faults FAULT PROBABLE CAUSE SOLUTION Clogged injection Have it repaired by an authorized   nozzle service The engine runs Fuel leak from pipes Tighten the clamp, replace the pipe   irregularly and attach the copper washer Poor fuel injection Have it repaired by an authorized ...

  • Page 122: Engine Faults

    TROUBLESHOOTING Engine Faults FAULT PROBABLE CAUSE SOLUTION Clogged air filter Check and clean   The engine Excessive amount of engine Check and set the correct amount   produces white smoke Insufficient fuel supply Have it repaired by an authorized ...

  • Page 123: Brake System Faults

    TROUBLESHOOTING Brake system faults FAULT PROBABLE CAUSE SOLUTION Brake pedal play Adjust the play   too large The brake does Worn or burned Have it repaired by an authorized service   Brake not work or only brake lining one side brakes Different play on the Set the same play on the left and right side...

  • Page 124: Hydraulic System Faults

    TROUBLESHOOTING Hydraulic system faults FAULT PROBABLE CAUSE SOLUTION Loose clamp Tighten   Oil leaks from Cracked pipes Have it repaired by an   pipes or hoses authorized service Lowering speed control lever Set it to the lowering position ...

  • Page 125: Electrical System Faults

    TROUBLESHOOTING Electrical system faults FAULT PROBABLE CAUSE SOLUTION Blown fuse Check the power lines and replace the   defective fuse Defective power Check for loose or missing cable, short   line circuit, poor grounding, and repair as needed Defective Have it repaired by an authorized service ...

  • Page 126: Appendix

    APPENDIX MODEL PRIMO HT 20NC Engine Engine manufacturer Yanmar Engine model 3TNV74F-ND Engine type 4-stroke, inline, water-cooled, diesel Nominal power kW (HP) 14.2 (19) Rated engine speed, rpm 3,000 Number of cylinders 60.6 (993) Displacement (cm Air filter Single dry Alternator 12 V 40 A Fuel system type...
  • Page 127 APPENDIX MODEL PRIMO HT 20NC Volumes Fuel tank U.S gal.(L) 6.6 (25) Cooling system U.S qt.(l) 3.7 (3.5) Liquids Crankcase (with filter) 2.1 (2) U.S qt.(L) Transmission and 3.6 (13.5) hydraulic system U.S gal. Front axle U.S qt.(L) 2.6 (2.5) Dimensions Total length with three- 94.2 (2062) point hitch in (mm)
  • Page 128 APPENDIX 1 - Fuel filter PRIMOHT20NC_0124 1 - Engine Oil Filter PRIMOHT20NC_0125 1- Filter Element PRIMOHT20NC_0126 Transmission dirt trap PRIMOHT20NC_0127...
  • Page 129 NOTES  ...

  • Page 130: Index

    Front Axle Oil Check and Change Front Link PTO ON / OFF Switch Front Link Assembly Fuel Gauge Rear Link Fuel System Recommended ZETOR service fillings Fuel, oil and fluid specification diagram. Reduced and Road Gears Shift Lever Fuse Box Recharge Fuse Check and Replacement...
  • Page 131 INDEX Roll-Over Protection Structure (ROPS) Throttle Lever Rops (roll over protection structures) Tips for Driving on a Slope ROPS damage Tips for using the steering wheel with power steering Run-in Tire Inflation Pressure Tractor controls Tractor runaway Safe operation of your tractor Tractor Storage Safe parking of the tractor Transmission...
  • Page 133 Operator's manual Primo HT 20 Edition: 1-100-2020 Publication No.: 222.213.574 09/2020 ZETOR TRACTORS a.s. Department of Technical Documentation Trnkova 111 628 00 Brno...
  • Page 134 Made in EU...

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