Bush Hog DHM Series Operator's Manual
  1. Manuals
  2. Brands
  3. Bush Hog Manuals
  4. Lawn Mower
  5. DHM Series
  6. Operator's manual

Bush Hog DHM Series Operator's Manual

Disc mower
Hide thumbs
Table of Contents

  • English

  • Español
    • Introducción
    • Reconocimiento
    • Alertas de Seguridad
    • Palabras para el Usuario/Operador
    • Cortadora de Césped Industrial/Para Agricultura
    • Cumplimiento del Programa de Seguridad
    • Preparación para una Operación Segura
    • Arranque con Seguridad
    • Operación con Seguridad
    • Apagado con Seguridad
    • Estacionamiento Seguro
    • Realización de Mantenimiento con Seguridad
    • Palabras Fi Nales para el Usuario
    • Starting the Tractor
    • Brake and Differential Lock Setting
    • Crossing Ditches and Steep Inclines
    • Driving the Tractor and Mower
    • Operating the Tractor and Implement
    • Bystanders/Passersby Precautions
    • Foreign Debris Hazards
    • Engaging the Power Take off (PTO)
    • Operating the Mower
    • PTO RPM and Ground Speed
    • Shutting down the Implement
    • Disconnecting the Mower from the Tractor
    • Mower Storage
    • Transporting the Tractor and Implement
    • Transporting the Mower
    • Transporting on Public Roadways
    • Hauling the Tractor and Implement
    • Troubleshooting Guide
    • Maintenance Section
    • Disk and Blade Maintenance
    • How to Check the Mower Devices
    • Disc Replacement
    • Lubrication
    • Proper Torque Chart for Fasteners
    • Storage

Advertisement

Quick Links

Download this manual
Published 5/19
This Operator's Manual is an
integral part of the safe operation
of this machine and must be
maintained with the unit at all
times. READ, UNDERSTAND, and
FOLLOW
Operation Instructions contained
in this manual before operating
the equipment. C01-Cover_B
®
BUSH HOG
2501 Griffin Ave.
Selma, AL 36703
334-874-2700
www.bushhog.com
OPERATOR'S MANUAL
the
Safety
© 2019 Alamo Group Inc.
MOWER
DHM8 DHM9 & DHM10
Important Operating
and
Safety
Instructions
found in the Mower
and
Safety
Video
can
be
instantly
accessed
on
DISC
Part No. 50078287
are
that
the
$0.00

Advertisement

Chapters

Table of Contents
loading
Need help?

Need help?

Do you have a question about the DHM Series and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Bush Hog DHM Series

Summary of Contents for Bush Hog DHM Series

  • Page 1 READ, UNDERSTAND, and found in the Mower FOLLOW Safety Safety Video that Operation Instructions contained instantly in this manual before operating accessed the equipment. C01-Cover_B ® BUSH HOG 2501 Griffin Ave. Selma, AL 36703 334-874-2700 www.bushhog.com $0.00 © 2019 Alamo Group Inc.
  • Page 3 In order to reduce accidents and enhance the safe operation of mowers, Bush Hog, in cooperation with other industry manufacturers has developed the AEM/FEMA Industrial and Agricultural Mower Safety Practices video and guide book. The video will familiarize and instruct mower-tractor operators in safe practices when using industrial and agricultural mowing equipment.
  • Page 4 Bush Hog will provide one (1) AEM Mower Safety Practices Video Please Send Me: VHS Format – AEM/FEMA Mower Operator Safety Video DVD Format – AEM/FEMA Mower Operator Safety Video Mower Operator’s Manual AEM Mower Operator’s Safety Manual Requester Name:_________________________________Phone:___________________________...
  • Page 5 A Manual canister is provided on the implement where this manual can be properly stored. If you lose or damage this manual a free replacement manual can be obtained from an authorized Bush Hog dealer or by down loading the manual from the Bush Hog website www.bushhog.com...
  • Page 6 DEALER to CUSTOMER Pre-Delivery / Operation Instructions Dealer should inform the Purchaser of this product of Warranty terms, provisions, and procedures that are applicable. Dealer should also inform the Purchaser to review the contents of the Operator’s Manual including safety equipment, safe operation and maintenance, to review the Safety Signs on the implement (and tractor if possible) and of Purchaser’s responsibility to train his/her operators in safe operation procedures.
  • Page 7 Table of Contents SAFETY SECTION ......................1-1 General Safety Instructions and Practices .......................1-2 Operator Safety Instructions and Practices......................1-3 Equipment Operation Safety Instructions and Practices..................1-5 Connecting or Disconnecting Implement Safety Instructions and Practices ..........1-10 Transporting Safety Instructions and Practices....................1-10 Maintenance and Service Safety Instructions and Practices .................1-12 Storage and Parking Safety Instructions and Practices .................1-15 Concluding Safety Instructions and Practices....................1-15 Decal Location ...............................1-16...

  • Page 8: Table Of Contents

    DRIVING THE TRACTOR AND IMPLEMENT ....................4-21 Starting the Tractor ............................4-22 Brake and Differential Lock Setting........................4-22 Working Position ............................4-23 Driving the Tractor and Mower........................4-24 Crossing Ditches and Steep Inclines ......................4-24 ..................................4-25 OPERATING THE TRACTOR AND IMPLEMENT..................4-26 Foreign Debris Hazards ..........................4-27 Bystanders/Passersby Precautions .......................4-27 Engaging the Power Take Off (PTO) ......................4-28 PTO RPM and Ground Speed ........................4-29...
  • Page 9 SAFETY SECTION Safety Section 1-1...
  • Page 10 SAFETY General Safety Instructions and Practices A careful operator is the best operator. Safety is of primary importance to the manufacturer and should be to the owner/operator. Most accidents can be avoided by being aware of your equipment, your surroundings, and observing certain precautions.
  • Page 11 SAFETY Operator Safety Instructions and Practices The rotating parts of this machine continue to rotate even after the PTO has been turned off. The operator should remain in the operator’s seat for 60 seconds after the brake has been set, the PTO disengaged, the tractor turned off, and all evidence of rotation has ceased. (S3PT-10) “Wait a minute...Save a life!”...
  • Page 12 SAFETY Never allow children to play on or around Tractor or Implement. Children can slip or fall off the Equipment and be injured or killed. Inadvertent contact with controls can cause the Implement to shift or fall crushing themselves or others. (SG-25) DO NOT use drugs or alcohol immediately before or while operating the Tractor and Implement.
  • Page 13 SAFETY Do not put hands or feet under mower decks. Blade Contact can result in serious injury or even death. Stay away until all motion has stopped and the decks are securely blocked up. (SGM-09) Always keep a careful lookout and use extreme care when working around utility and municipal obstructions.
  • Page 14 SAFETY BEFORE leaving the tractor seat lower the implement, set the parking brake and/or set the tractor transmission in parking gear, disengage the PTO, stop the engine, remove the key, and wait for all moving parts to stop. Place the tractor shift lever into a low range or parking gear to prevent the tractor from rolling.
  • Page 15 SAFETY Never run the Tractor engine in a closed building or without adequate ventilation. The exhaust fumes can be hazardous to your health. (SG-23) Do not exceed the rated PTO speed for the Implement. Excessive PTO speeds can cause Implement driveline or blade failures resulting in serious injury or death. (SG-26) Operate the Tractor and/or Implement controls only while properly seated in the Tractor seat with the seat belt securely fastened around you.
  • Page 16 SAFETY The rotating parts of this machine have been designed and tested for rugged use. However, the blades could fail upon impact with heavy, solid objects such as metal guard rails and concrete structures. Such impact could cause the broken objects to be thrown outward at very high velocities.
  • Page 17 SAFETY Follow these guidelines to reduce the risk of equipment and grass fires while operating, servicing, and repairing the Mower and Tractor: -Equip the Tractor with a fire extinguisher in an accesible location. -Do Not operate the Mower on a Tractor with an underframe exhaust. -Do Not smoke or have an open flame near the Mower and Tractor.
  • Page 18 SAFETY Disc Mowers rotate at a very high rate of speed (3000 RPM). Vibration due to missing, broken, or unbalanced components may cause serious imbalance and lead to rapid failure of components and possible bodily injury from components failure or thrown objects. KEEP BLADE BOLTS AND DISC ATTACHING BOLTS TIGHTENED TO A SPECIFIED IN OPERATORS MANUAL TO ASSURE THE INTEGRITY OF THE ASSEMBLIES.
  • Page 19 SAFETY This Implement may be wider than the Tractor. Be careful when operating or transporting this equipment to prevent the Implement from running into or striking sign posts, guard rails, concrete abutments or other solid objects. Such an impact could cause the Implement and Tractor to pivot violently resulting in loss of steering control, serious injury, or even death.
  • Page 20 SAFETY Only tow the Implement behind a properly sized and equipped Tractor which exceeds the weight of the Implement by at least 20%. DO NOT tow the Implement behind a truck or other type of vehicle. Never tow the Implement and another Implement connected in tandem. Never tow the Implement at speeds over 20 MPH.
  • Page 21 SAFETY Do not modify or alter this Implement. Do not permit anyone to modify or alter this Implement, any of its components or any Implement function. (SG-8) Never work under the Implement, the framework, or any lifted component unless the Implement is securely supported or blocked up to prevent sudden or inadvertent falling which could cause serious injury or even death.
  • Page 22 (SGM-10) PARTS INFORMATION Bush Hog mowers use balanced and matched system components for blade carriers, blades, cuttershafts, knives, knife hangers, rollers, drivetrain components, and bearings. These parts are made and tested to Bush Hog specifications. Non-genuine "will fit" parts do not consistently meet these specifications. The use of “will fit”...
  • Page 23 SAFETY Storage and Parking Safety Instructions and Practices A rear Implement can fall if not properly supported. Always use the stand on the front hitch (if equipped) or block up securely to prevent falling and possible crushing injury and/or other injury from holding or lifting heavy components. Use the stand to stabilize the implement during storage.
  • Page 24 SAFETY Decal Location NOTE: Bush Hog supplies safety decals on this product to promote safe operation. Damage to the decals may occur while in shipping, use, or reconditioning. Bush Hog cares about the safety of its customers, operators, and bystanders, and will replace the safety decals on this product in the field, free of charge (Some shipping and handling charges may apply).
  • Page 25 Warning Decal, Thrown Objects 001.695 CAUTION Caution Decal, Disconnect 001.320 WARNING Warning Decal, Read Manual D559 WARNING Warning Decal, Bush Hog Genuine Parts Serial Plate SERIAL Serial Number Plate 50058089 LOGO Bush Hog Decal 2.42” x 11” 50061049 LOGO Bush Hog Decal 4.85” x 22.00”...
  • Page 26 SAFETY DHM 8, 9, 10 05/19 Safety Section 1-18 © 2019 Alamo Group Inc.
  • Page 27 SAFETY DHM 8, 9, 10 05/19 Safety Section 1-19 © 2019 Alamo Group Inc.
  • Page 28 SAFETY DHM 8, 9, 10 05/19 Safety Section 1-20 © 2019 Alamo Group Inc.
  • Page 29 SAFETY FEDERAL LAWS AND REGULATIONS This section is intended to explain in broad terms the concept and effect of federal laws and regulations concerning employer and employee equipment operators. This section is not intended as a legal interpretation of the law and should not be considered as such.
  • Page 32 Contents Acknowledgment ......2 Foreword ........2 Safety Alerts.

  • Page 33: Safety Alerts

    Safety Alerts Symbol Signal Words This Safety Alert Symbol means: “ATTENTION! Signal words are distinctive words that will typically be STAY ALERT! YOUR SAFETY IS INVOLVED!” found on safety signs on the mower and other worksite equipment. These words may also be found in this The Safety Alert Symbol identifi es important safety manual and the manufacturer’s manuals.

  • Page 34: The Industrial/Agricultural Mower

    The Industrial/Agricultural Mower Industrial/Agricultural Mower Types Mowers are used for pasture clipping, crop residue shredding, heavy brush cutting, waterways, right-of- Flail ways, roadside or highway mowing. Also, these mowers are used for cutting grass and other growth in public areas such as parks and cemeteries. Boom Rotary Sickle Bar...

  • Page 35: Follow A Safety Program

    Follow A Safety Program Protect Yourself Wear personal protective clothing and Personal Protective Equipment (PPE) issued to you or called for by job conditions. You must ALWAYS wear safety glasses with side shields. You may also need: — Hard hat —...
  • Page 36 Follow A Safety Program Avoid Injury From Raised Equipment Avoid Injury From High Pressure Fluid Avoid possible crushing injury from falling mower or Avoid fl uid injection injury due to high pressure fl uid leaks. other raised equipment. High Pressure Fluid Can Inject into the Body Avoid Crushing –...
  • Page 37 Follow A Safety Program Be Alert! For Safe Operation Know where to get assistance. Know how to use a fi rst You must be a qualifi ed and authorized operator for aid kit and fi re extinguisher/fi re suppression system. proper operation of your machine.
  • Page 38 Follow A Safety Program Some Rules You Must Work By (continued) Keep — Only qualifi ed and authorized individuals may operate Children this equipment. Away from — Never allow children to play on, ride on or operate Equipment the equipment. Children are not qualifi ed to operate this equipment.

  • Page 39: Prepare For Safe Operation

    Prepare For Safe Operation Check The Mower And Tractor Equipment Before beginning your work day inspect the machine Walk-Around and have all systems in good operational condition. Inspection WARNING! Prevent possible crushing injury from falling equipment. Hydraulic system or part failure could cause unsupported equipment to fall.
  • Page 40 Prepare For Safe Operation Know The Work Area Correct unsafe conditions. Do not operate in problem areas where debris and obstacles cannot be removed Before you operate the mower thoroughly inspect or marked. the work area. Walk around the area and inspect the Analyze mowing area to determine: surfaces you will travel on when using the mower.
  • Page 41 Prepare For Safe Operation Tractor And Mower Controls Safety Test — Raise and lower mower to check for driveline bottoming out or engagement problems. Start the tractor following the specifi c procedures in the — Check the equipment for excessive vibration and manufacturer’s operator’s manual.
  • Page 42 Prepare For Safe Operation Hitching Mower To Tractor Read and Three-point hitch-mounted mowers: Understand Manuals Before — Refer to mower and tractor manufacturers’ manuals. Operating — Place tractor’s hydraulic power lift (rockshaft) selector lever in down position to avoid unexpected movement.

  • Page 43: Start Safely

    Start Safely Make The Right Start Mow only in daylight or good artifi cial light conditions. Rotating Blades – Avoid serious injury or death from mower-thrown Keep Away objects or blade contact: — Keep chain shields, fl exible or solid defl ector shields or discharge chutes in place and in good repair.
  • Page 44 Operate Safely Mower-Thrown Objects (continued) Disc Mowers — When using a disc mower it is Do Not Mow important to know the area to be mowed. If the operator in Reverse has mowed the fi eld before and is familiar with all obstacles that may be present, it is suffi cient to watch ahead of the mower path for any additional objects that may have entered the fi eld.
  • Page 45 Operate Safely Under Mount Mower Safety Practices When mowing with an under mount mower: Never Stand — Keep removable discharge chute in place and over on Mower – Keep Away discharge opening. — Never stand on a mower housing when the tractor engine is operating.
  • Page 46 Operate Safely Wing And Side Mount Mowers Safety Practices 300 ft (92 m) Raised wing positions reduce shielding protection and Keep Bystanders increases the thrown object and blade contact hazard Away from risks. Mowing Area Avoid possible serious injury or death by thrown objects or blade contact from raising and lowering wings during mowing operations: —...
  • Page 47 Operate Safely Uneven Terrain Mowing Safety Practices (continued) Maintain — Use extreme care to maintain control over the Control, Use Low equipment when operating in these conditions. Speeds — Increase tractor stability by adding wheel weights, ballast and increasing wheel spacing to maximum. Refer to operator’s manual for recommendations.

  • Page 48: Park Safely

    Park Safely Parking Safety Practices — Use designated or out-of-traffi c areas. — Use fi rm level ground locations. Parking Brake — Set parking brake. — Lower raised equipment to ground. Shut down the mower and tractor using proper equipment shut down practice before dismounting tractor.

  • Page 49: Perform Maintenance Safely

    Shut Down Safely Dismounting Properly — Never dismount from moving equipment. Wait for — Never jump from any machines. Moving Parts to Stop — Dismount carefully. — Check for slippery steps. — Keep feet and hands away from controls. — Use handholds and steps during dismount. —...
  • Page 50 Perform Maintenance Safely Prepare Yourself Wear personal protective clothing and Personal Protective Equipment (PPE) issued to you or called for by job conditions. You must ALWAYS wear safety glasses with side shields. You may also need: — Hard hat — Safety shoes —...
  • Page 51 Perform Maintenance Safely Prepare The Machine — Securely support, block up, or lock up mower wings with approved locking devices before working near or Stored energy sources (electrical, mechanical, hydraulic, underneath a wing mower. pneumatic, chemical, thermal, etc.) must be controlled —...
  • Page 52 Perform Maintenance Safely Perform Maintenance Safely Use Proper Ventilation Make sure the hoists or jacks you use are in good repair. Never use jacks with cracked, bent, or twisted parts. If it is necessary to run an engine in an enclosed area, Never use frayed, twisted or pinched cables.
  • Page 53 Perform Maintenance Safely Hydraulic System Hazards When venting or fi lling the hydraulic system, loosen the fi ller cap slowly and remove it gradually. The hydraulic system is under pressure whenever the Never reset any relief valve in the hydraulic system to a engine is operating and may hold pressure even after the pressure higher than recommended by the manufacturer.
  • Page 54 Perform Maintenance Safely Avoid Explosion — Observe the polarity of the batteries and connections. — Make the fi nal cable connection to the engine or the WARNING! Avoid possible serious injury from furthest ground point away from the battery. Never explosion.
  • Page 55 Perform Maintenance Safely Tire And Wheel Maintenance (continued) Never cut or weld on a wheel with an infl ated tire mounted on it. This could cause explosive WARNING! The types of wheels and tires usually decompression. found on this equipment require special care when Check that the tire size and wheel are correctly matched.

  • Page 56: Final Word To The User

    Perform Maintenance Safely Mower Blade Maintenance (continued) — Avoid bending blades. Help prevent mower blades from bending or cracking by avoiding contact with — How are mower blades made? solid objects. Mower blades are intended to cut Mower blades are made of high strength alloy spring grass, shrubs, woody vegetation, and small trees and steel.

  • Page 58: Reconocimiento

    Contenido Reconocimiento ....... 2 Introducción ........2 Alertas de seguridad .

  • Page 59: Alertas De Seguridad

    Alertas de seguridad Símbolo Palabras indicativas Este símbolo de alerta de seguridad signifi ca: Las palabras indicativas son palabras distintivas que “¡ATENCIÓN! ¡MANTÉNGASE ALERTA! ¡SU típicamente se encontrarán en letreros de seguridad SEGURIDAD ESTÁ EN RIESGO!” de la cortadora de césped y otros equipos del sitio de trabajo.

  • Page 60: Cortadora De Césped Industrial/Para Agricultura

    Cortadora de césped industrial/para agricultura Tipos de cortadora de césped industrial/para agricultura Las cortadoras de césped se usan para recortar pasturas, Triturador desmenuzar residuos de cultivos, cortar arbustos, realizar desbroce pesado, cortar la hierba en vías de agua, derechos de paso, costados de caminos o autopistas. Además, estas cortadoras se usan para cortar la hierba y otras plantas en zonas públicas como parques y cementerios.

  • Page 61: Cumplimiento Del Programa De Seguridad

    Cumplimiento del programa de seguridad Protéjase a sí mismo Use la ropa de protección personal y los equipos de protección personal (PPE) que se le proporcionen o que requieran las condiciones del trabajo. SIEMPRE debe usar gafas de seguridad con escudos laterales. Puede necesitar también: —...
  • Page 62 Cumplimiento del programa de seguridad Evite las lesiones provocadas por equipos elevados Si un fl uido se inyecta en la piel, debe ser extraído dentro de pocas horas por personal médico Evite posibles lesiones de aplastamiento por caídas de la familiarizado con este tipo de lesión.
  • Page 63 Cumplimiento del programa de seguridad ¡Manténgase alerta! Para una operación segura Sepa dónde obtener asistencia. Sepa cómo usar un Usted debe ser un operador cualifi cado y autorizado equipo de primeros auxilios y un extintor de incendios/ para operar la máquina correctamente. Debe comprender sistema de supresión de fuego.
  • Page 64 Cumplimiento del programa de seguridad Algunas reglas que debe cumplir al trabajar (continuación) Mantenga — Únicamente personas cualifi cadas y autorizadas a los niños alejados pueden manejar estos equipos. de los equipos — Nunca permita que los niños jueguen en los equipos, viajen en ellos o los hagan funcionar.

  • Page 65: Preparación Para Una Operación Segura

    Preparación para una operación segura Revise los equipos de la cortadora de césped y el marcadas; incluya los pernos y sujetadores de las hojas. Nunca enderece o suelde en las hojas. tractor — Asegúrese de que el escudo para objetos que son Antes de comenzar la jornada de trabajo, inspeccione la arrojados se encuentre correctamente instalado y en buen máquina y asegúrese de que todos los sistemas estén en...
  • Page 66 Preparación para una operación segura Familiarícese con la zona de trabajo Corrija las condiciones no seguras. No opere en áreas con problemas donde no se puedan retirar o marcar los Antes de hacer funcionar la cortadora de césped, residuos y los obstáculos. inspeccione cuidadosamente la zona de trabajo.
  • Page 67 Preparación para una operación segura Prueba de seguridad de los controles del tractor y de la cortadora de césped Use el ROPS Arranque el tractor siguiendo los procedimientos y el cinturón de seguridad específi cos del manual del operador del fabricante. Estos procedimientos normalmente incluyen: —...
  • Page 68 Preparación para una operación segura Enganche de la cortadora de césped al tractor Lea y asegúrese Cortadoras montadas en enganche de tres puntos: de comprender los — Consulte los manuales de los fabricantes de la manuales antes de comenzar la cortadora y del tractor.

  • Page 69: Arranque Con Seguridad

    Arranque con seguridad Cómo realizar un arranque correcto Corte la hierba únicamente con luz diurna o en condiciones de buena luz artifi cial. Hojas giratorias – Manténgase Evite lesiones graves o muerte producidas por objetos arrojados por la cortadora o por el contacto con las hojas: —...
  • Page 70 Operación con seguridad Objetos arrojados por la cortadora de césped Apague la TDF, espere que las hojas dejen de girar, eleve la cortadora y, después, retroceda. (continuación) Corte desplazándose en sentido de avance. Cortadoras de disco — Cuando se usa una cortadora de disco, es importante conocer la zona donde se va a cortar.
  • Page 71 Operación con seguridad Prácticas de seguridad para la cortadora de césped de montaje inferior Nunca se pare sobre la cortadora Cuando se traslada con una cortadora de césped de de césped – montaje inferior: Manténgase alejado — Mantenga la rampa de descarga extraíble en su lugar y por encima de la abertura de descarga.
  • Page 72 Operación con seguridad Prácticas de seguridad para cortadoras de 300 ft césped con laterales y montaje lateral (92 m) Mantenga a las personas ajenas Las posiciones elevadas de los laterales reducen la alejadas de la zona protección de los escudos y aumentan los riesgos de de corte objetos arrojados y contacto con las hojas.
  • Page 73 Operación con seguridad Prácticas de seguridad para trabajos de corte en terrenos desparejos (continuación) Mantenga — Use extremo cuidado para mantener el control de los el control, equipos cuando trabaja en estas condiciones. desplácese — Aumente la estabilidad del tractor agregando pesos o lastre en las ruedas y aumentando al máximo la separación entre las ruedas.

  • Page 74: Estacionamiento Seguro

    Estacionamiento seguro Prácticas de seguridad para el estacionamiento — Use las zonas designadas o alejadas del tránsito. Aplique el freno de — Use lugares con suelo fi rme y nivelado. estacionamiento — Aplique el freno de estacionamiento. — Descienda el equipo de la cortadora de césped hasta el suelo.

  • Page 75: Realización De Mantenimiento Con Seguridad

    Apagado con seguridad Descenso correcto — Nunca descienda de equipos en movimiento. Espere hasta que las — Nunca baje de una máquina saltando. piezas móviles se detengan — Descienda con cuidado. — Verifi que que no haya peldaños resbaladizos. — Mantenga los pies y las manos lejos de los controles. —...
  • Page 76 Realización de mantenimiento con seguridad Preparación personal Use la ropa de protección personal y los equipos de protección personal (PPE) que se le proporcionen o que requieran las condiciones del trabajo. SIEMPRE debe usar gafas de seguridad con escudos laterales. Puede necesitar también: —...
  • Page 77 Realización de mantenimiento con seguridad Preparación de la máquina Deben controlarse o reducirse las fuentes de energía Prepare los sistemas de la almacenada (eléctricas, mecánicas, hidráulicas, máquina para neumáticas, químicas, térmicas, etc.) al mínimo realizarles servicios practicable antes de realizar cualquier procedimiento de mantenimiento, reparación o servicio.
  • Page 78 Realización de mantenimiento con seguridad Use ventilación adecuada Si es necesario hacer funcionar un motor en una zona Retire la llave y cerrada, elimine del área las emanaciones de escape lea el manual de con una extensión del caño de escape. Si no tiene esa mantenimiento extensión, asegúrese de abrir las puertas y dejar entrar aire del exterior.
  • Page 79 Realización de mantenimiento con seguridad Riesgos del sistema hidráulico Cuando ventila o llena el sistema hidráulico, afl oje la tapa de llenado con lentitud y retírela gradualmente. El sistema hidráulico se encuentra bajo presión siempre Nunca restablezca una válvula de alivio del sistema que el motor está...
  • Page 80 Realización de mantenimiento con seguridad Evite explosiones — Asegúrese de que las máquinas no se estén tocando. — Observe la polaridad de las baterías y conexiones. ¡ADVERTENCIA! Evite posibles lesiones graves por — Realice la conexión fi nal de cable al motor o al punto explosiones.
  • Page 81 Realización de mantenimiento con seguridad Mantenimiento de neumáticos y ruedas (continuación) Evite la explosión ¡ADVERTENCIA! Los tipos de ruedas y neumáticos de los neumáticos que generalmente se encuentran en estos equipos requieren cuidados especiales al realizar servicios para evitar lesiones graves o la muerte. No infl e los neumáticos por encima de la presión No infl e neumáticos con gases infl amables o con sistemas recomendada.

  • Page 82: Palabras Fi Nales Para El Usuario

    Realización de mantenimiento con seguridad Mantenimiento de las hojas de la cortadora — Evite doblar las hojas. Contribuya a prevenir que las hojas de la cortadora se doblen o rajen evitando el (continuación) contacto con objetos sólidos. Las hojas de la cortadora —...
  • Page 83 INTRODUCTION SECTION Introduction Section 2-1 © 2019 Alamo Group Inc.
  • Page 84 INTRODUCTION This Mower is designed with care and built with quality materials by skilled workers. Proper assembly, maintenance, and operating practices, as described in this manual, will help the owner/operator get years of satisfactory service from the machine. The purpose of this manual is to familiarize, instruct, and train. The Safety Section is a MUST READ section prior to any use of the mower.
  • Page 85 INTRODUCTION The DHM mowers have been performance tested and proven to reduce plugging and wrapping in both light and heavy hay crops. Each cutter bar has been designed with added stiffness to provide exceptional strength in all working conditions. Oval discs allow for superior flow of material over the cutter bar and a better distribution of you hay crop.
  • Page 86 NOTE: Warranties are honored only if completed “Owner Registration and Warranty” forms are received by Bush Hog within thirty days of delivery of the implement. 3. Record the Model and Serial Numbers on the Warranty page at the front of the Operator’s Manual. Keep this as part of the permanent maintenance file for the implement.
  • Page 87 2. If the unit has been subjected to misapplication, abuse, misuse, negligence, fire or other accident. 3. If parts not made or supplied by Bush Hog have been used in connection with the unit, if, in the sole judgement of Bush Hog such use affects its performance, stability or reliability.
  • Page 89 ASSEMBLY SECTION Assembly Section 3-1...
  • Page 90 ASSEMBLY TECHNICAL NOTES TO AID IN ASSEMBLY Examples will make it easier to choose which of the various accessories to use for each step of assembly. An approximate equivalent of the metric measurements is given in inches. Pins and Screws Example: A pin with a 25mm (1”) diameter and a screw with a M16 (5/8”) diameter, both 50mm (2”) long, will be listed as: D 25x50 (D 1”x2”) and M16x50...
  • Page 91 ASSEMBLY ASSEMBLY Refer to fig. Asm-D-0018 & 0019 and carry out the following steps in the order indicated: The disc mower is shown packaged in crate in Figure Asm-D-0018. Use a forklift truck, crane or other suitable equipment of sufficient capacity to attach the machine in holes 1 and lift the machine pivoting in pin 5 until position in Figure Asm-D-0019 is reached.
  • Page 92 ASSEMBLY Refer to Figure Asm-D-0020 and carry out the following steps in the order indicated: 1. Use pin 5 (ø35x244 - ø1-3/8”x9-9/32”) to mount tie rod 1 into the support 20 and fasten with two spring pins (ø8x50 - ø5/16 x 2”). 2.
  • Page 93 ASSEMBLY Refer to fig. Asm-D-0023 and Asm-D-0024 to carry out the following steps in the order indicated: 1. The conveyor disk 5 (Asm-D-0024) is splined to a shaft and has to be positioned so that the main axle is at right angles with those next to it. See Figure Asm-D-0023 2.
  • Page 94 ASSEMBLY Refer to fig. AsmP-D-0017 and carry out the following steps in the order indicated: 1. Mount hook 1 as in Fig. Asm-D-0026 with pin 2 and fasten with two spring pins (ø6x40 - ø15/64x1-36/64) and two washers (ø26 - ø1'). 2.
  • Page 95 ASSEMBLY Refer to fig. Asm-D-0029 and carry out the following steps in the order indicated: 1. Mount hay plate 1 to the cutter bar with screws item 2 (M12x35-1/2”x1-3/8”) and 3 (M10x35-3/ 8”x1-3/8”) and washers (ø10-25/64”). 2. Mount support 5 to the canvas support 6 with four screws item 4(M12x25-15/32”x1”) and growers (ø13-1/2”) with 80Nm torque.
  • Page 96 ASSEMBLY Refer to fig. Asm-D-0031 and carry out the following steps in the order indicated: 1. Mount lift lever 1 as in figure on pin 2 and fasten with one spring pin (ø6x45-ø15/64”x1-49/64” and washer (ø26-ø1”) 2. Mount lift lever 3 as in figure on pin 4 and fasten with one spring pin (ø6x45-ø15/64”x1-49/64”) and bushing with hole (ø25-ø40x21-ø1”-ø1-9/ 16”x13/16”).
  • Page 97 ASSEMBLY Refer to Figure Asm-D-0033 and carry out the following steps in the order indicated: Mount conveyor sheet 4 with: Point 9: Screw (M8x25-5/16”x1”), two large washers and nut. Point 8: Screw (M10x25-ø25/64”x1”), washer and nut. Point 11: On the rear view of the machine with screw (M10x25-ø25/64”x1”), washer and nut.
  • Page 98 ASSEMBLY Refer to Figure Asm-D-0034 and carry out the following steps in the order indicated: 1. Mount rear protection 13 on support canvas 1 as shown with five screw 14 (M10x20-25/64”x25/32”) and nut 16 (M10-25/64) and washer 15. Use screw 42 (M10x25-25/64”x1”) to mount vertical protection 45. DO NOT USE HOLE 43 AT THIS TIME.
  • Page 99 ASSEMBLY Refer to Figure Asm-D-0035 and carry out the following steps in the order indicated: 1. Mount protection canvas with the opening for cylinder and spring bar in right position. Fasten all the belt of the canvas. 2. Mount plugs (ø33.7x3-1-5/16”x7/64”) for pipe 1 and 2.
  • Page 100 ASSEMBLY 6. Insert hydraulic hose 1 in the open ring 2. DHM 8, 9, 10 05/19 Assembly Section 3-12 © 2019 Alamo Group Inc.
  • Page 101 OPERATION SECTION Operation Section 4-1...
  • Page 102 DHM 8, 9, & 10 DISC MOWER OPERATION INSTRUCTIONS Bush Hog’s latest edition of Hay Mower includes 4 models with mowing widths ranging from 7’ to 10’ to meet the hay production requirement of today’s farmers and ranchers. The mower is equipped with protective deflectors and/or chain guards to prevent objects being thrown from the mower by the blades, however, no shielding is 100% effective.
  • Page 103 OPERATION Standard Equipment and Specifications DHM8 DHM9 DHM10 Mowing Width 8’ 9’3” 10’6” Number of Oval Discs Blades per Disc Driveline Size CAT 4 CAT 4 CAT 4 Minimum PTO HP Hitch CAT 2 CAT 2 CAT 2 PTO Speed Safety Chain Standard Standard...
  • Page 104 OPERATION 2. OPERATOR REQUIREMENTS Safe operation of the unit is the responsibility of a qualified operator. A qualified operator has read and understands the implement and tractor Operator’s Manuals and is experienced in implement and tractor operation and all associated safety practices. In addition to the safety messages contained in this manual, safety signs are affixed to the implement and tractor.
  • Page 105 OPERATION 3. TRACTOR REQUIREMENTS The tractor used to operate the mower must have the power capacity to lift, pull, and operate the Power Take Off (PTO) at the mower’s rated speed while traveling at a ground speed between 2 and 5 MPH. Operating the mower with a tractor that does not meet the following requirements may cause tractor or mower damage and be a potential danger to the operator and passersby.
  • Page 106 OPERATION 3.3 Tractor Horsepower The power required to operate a mower is determined by the tractor PTO horsepower. For most mowing conditions, the DHM8 mower requires a tractor with at least 46 HP, 52 HP for DHM9 and 56 HP for DHM10. Operating the mower with a tractor that does not have adequate power may damage the tractor engine.
  • Page 107 OPERATION DO NOT use a PTO adapter to attach a non-matching Implement driveline to a Tractor PTO. Use of an adapter can double the operating speed of the Implement resulting in excessive vibration, thrown objects, and blade and implement failure. Adapter use will also change the working length of the driveline exposing unshielded driveline areas.

  • Page 108: Starting The Tractor

    OPERATION Never allow children or other persons to ride on the Tractor or Implement. Falling off can result in serious injury or death. (SG-10) 4.2 Dismounting the Tractor Before dismounting, park the tractor and implement on a reasonably level surface, apply the parking brake, idle the engine down, disengage the PTO, and lower the implement to the ground.
  • Page 109 OPERATION Start tractor only when properly seated in the Tractor seat. Starting a tractor in gear can result in injury or death. Read the Tractor operators manual for proper starting instructions. (SG-13) 6. CONNECTING THE MOWER TO THE TRACTOR Use extreme caution when connecting the mower to the tractor. The mower should be securely resting at ground level or setting on blocks.
  • Page 110 OPERATION 6.1 Connecting the Mower The disc mower can be adapted to tractors with various gauges by placing the two hoist arms as shown, so that distance A is about 5 cm (2 inches) when the machine is in the work position. In order to obtain the various positions in Ops-2400, slide the pins 13, shown in Ops 2401 tin the respective slots and fasten into position with screws 22 and...
  • Page 111 OPERATION 7. SETTING THE MOWER Properly setting the cutting height is essential for efficient and safe operation. A properly set mower will make a more uniform cut, distribute clippings more evenly, require minimal tractor work, and follow the contour of uneven terrain.
  • Page 112 OPERATION 7.2 Adjusting Cutting Height The cutting height can be adjusted by using turnbuckle 1 on the third tractor point to vary the tilt of the knives compared to the ground (Distance F). Cutting height may vary within the range of 16/60 mm (0.63/2.36 inches) even though uneven land may influence these values.
  • Page 113 OPERATION 7.4 Belt Tension Adjustment NOTE: Belt tension must be checked regularly particularly during the first few hours of use. In order to adjust tension proceed as follows: 1. In order to have the right belt tension, you have to tighten screw A till the spacing pipe C is in contact with upright D and washer B, they tighten screw A for other 2 complete turns.
  • Page 114 OPERATION 7.6 Safety Device The dimension A must always be higher than 85 mm (3-11/32”) or there could be the danger of NOT unhooking when it receives blows that are too strong Safety device B unhooks when it receives blows that are too strong for the machine structure.
  • Page 115 OPERATION 9. PRE-OPERATION INSPECTION AND SERVICE Before each use, a pre-operation inspection and service of the implement and tractor must be performed. This includes routine maintenance and scheduled lubrication, inspecting that all safety devices are equipped and functional, and performing needed repairs. DO NOT operate the unit if the pre-operation inspection reveals any condition affecting safe operation.
  • Page 116 OPERATION 9.1 Tractor Pre-Operation Inspection/Service Refer to the tractor operator’s manual to ensure a complete pre-operation inspection and scheduled service performed according manufacturers recommendations. The following are some of the items that require daily service and inspection: • Tire condition/air pressure •...
  • Page 117 OPERATION • Perform scheduled lubrication as detailed in the maintenance section. • Ensure all decals are in place and legible. • Ensure the driveline is securely attached to tractor. Make sure the driveline yoke locking collar is securely seated in the grooves of the PTO shaft by pushing and pulling the yoke several times.
  • Page 118 OPERATION • Inspect blades and blade bolts for looseness and excessive wear. Make sure the mower is securely blocked up before crawling beneath. Replace damaged, worn and missing blades as complete sets to maintain rotary balance during operation. • Ensure carrier hub nut is tightened with the cotter pin inserted and spread.
  • Page 119 OPERATION Disc Mower PRE-OPERATION Inspection IMPORTANT: Scan Mower ID#________________ this QR Code for an Date: ________________ electronic copy of this inspection sheet. Before conducting the inspection, make sure the tractor engine is off, all rotation has stopped and the tractor is in park with the parking brake engaged.
  • Page 120 OPERATION Tractor PRE-OPERATION Inspection Tractor ID#:________________________Make:________________________ Date:______________________________Shift:________________________ Before conducting the inspection, make sure the tractor engine is off, all rotation has stopped and the tractor is in park with the parking brake engaged. Make sure the implement is resting on the ground or securely blocked up and all hydraulic pressure has been relieved.
  • Page 121 OPERATION 10. DRIVING THE TRACTOR AND IMPLEMENT Safe tractor transport requires the operator possess a thorough knowledge of the model being operated and precautions to take while driving with an attached implement. Ensure the tractor has the capacity to handle the weight of the implement and the tractor operating controls are set for safe transport.

  • Page 122: Brake And Differential Lock Setting

    OPERATION 10.1 Starting the Tractor The procedure to start the tractor is model specific. Refer to the tractor operator’s manual for starting procedures for your particular tractor. Consult an authorized dealer if the starting procedure is unclear. Ensure the 3-point control lever is in the lowered position and the PTO is disengaged before starting the tractor.
  • Page 123 OPERATION 10.3 Working Position To move from the transport position to the work position proceed as follows: BEFORE STARTING OPERATION, MAKE SURE THERE ARE NO PEOPLE OR ANIMALS IN THE VICINITY OF THE MOWER. 1. Put the hydraulic cylinder under pressure to lighten the locking hook A.

  • Page 124: Driving The Tractor And Mower

    OPERATION 10.4 Driving the Tractor and Mower Start off driving at a slow speed and gradually increase your speed while maintaining complete control of the tractor and mower. Moving slowly at first will also prevent the tractor from rearing up and loss of steering control.
  • Page 125 OPERATION When confronted with an incline or ditch, do not approach from an angle which is perpendicular or straight on as damage to or over-collapse of the driveline may occur. OPS-R-0021_A Inclines and ditches should be approached along a line which is at an angle as shown. This type of path will reduce the possibility of over-collapse of the driveline and resulting damage.

  • Page 126: Operating The Tractor And Implement

    OPERATION 11. OPERATING THE TRACTOR AND IMPLEMENT THE OPERATOR MUST COMPLETELY UNDERSTAND HOW TO OPERATE THE TRACTOR AND IMPLEMENT AND ALL CONTROLS BEFORE ATTEMPTING TO OPERATE. The operator must read and understand the Safety and Operation Sections of the implement and tractor operator’s manuals. These manuals must be read and explained to any operator who cannot read.

  • Page 127: Foreign Debris Hazards

    OPERATION 11.1 Foreign Debris Hazards Before mowing, inspect the area to make sure there are no foreign objects that the mower blades could hit or become entangled with. Remove all foreign objects and debris. If objects are too big to remove, mark them clearly and be sure to prevent the mower blades from contacting them.

  • Page 128: Engaging The Power Take Off (Pto)

    OPERATION Rotary Mowers are capable under adverse conditions of throwing objects for great distances (300 ft (100 m) or more) and causing serious injury or death. Follow safety messages carefully. STOP MOWING IF PASSERSBY ARE WITHIN 300 Feet (100 m) UNLESS: -Front and Rear Deflectors, Chain Guards, or Bands are installed and in good, workable condition;...

  • Page 129: Pto Rpm And Ground Speed

    OPERATION 11.4 PTO RPM and Ground Speed Ground speed for mowing will depend upon the height, type, and density of vegetation to be cut. Recommended speed for efficient mower performance is between 2 and 5 mph(3-8 kph). Operate the mower at its full rated PTO speed to maintain blade speed for a clean cut.
  • Page 130 OPERATION Make sure the protective cover is securely in place all around the mower bar hazard. The protective cover avoids throwing out of plant residues and foreign objects. Before putting the mower bar into the forage, connect the tractor power takeoff and accelerate gradually up to 540 RPM.

  • Page 131: Shutting Down The Implement

    OPERATION 11.5 Shutting Down the Implement To shut down attached mower head, first bring the tractor to a complete stop. Decrease engine RPM to idle then disengage cutterhead. The mower head will come to a complete stop within a suitable amount of time.

  • Page 132: Disconnecting The Mower From The Tractor

    OPERATION 12. DISCONNECTING THE MOWER FROM THE TRACTOR During operations when disconnecting the machine, be careful not to lower the mower bar below the horizontal line. 1. Using the hydraulic cylinder, lower the disc mower bar into the horizontal position. Ops- 2414.

  • Page 133: Mower Storage

    OPERATION MOWER STORAGE Properly preparing and storing the mower at the end of the season is critical to maintaining its appearance and to help ensure years of dependable service. The following are suggested storage procedures: • Thoroughly clean all debris off the mower to prevent damage from rotting grass and standing water.

  • Page 134: Transporting The Mower

    OPERATION 14. Transporting the Mower Make sure that no person or object is standing within the turnover range of the disk carrier bar. Before transporting the machine on public roads, the user must always make sure that it complies with highway regulations. 1.
  • Page 135 OPERATION Before transporting the tractor and mower, idle the tractor engine, disengage the PTO and wait for all mower moving parts to come to a complete stop. Once all mower parts are completely stopped, raise the mower to transport height. NOTE: When raising the mower, maintain 1”...

  • Page 136: Transporting On Public Roadways

    OPERATION 14.1 Transporting on Public Roadways Extreme caution should be used when transporting the tractor and implement on public roadways. The tractor must be equipped with all required safety warning features including a SMV emblem and flashing warning lights to alert drivers of the tractor’s presence. Remember that roadways are primarily designed for automotive drivers and most drivers will not be looking out for you, therefore, you must look out for them.

  • Page 137: Hauling The Tractor And Implement

    OPERATION When operating public roads, have consideration for other road users. Pull to the side of the road occasionally to allow all following traffic to pass. Do not exceed the legal speed limit set in your country for agricultural tractors. Always stay alert when transporting the tractor and implement on public roads.
  • Page 138 OPERATION Use adequately sized and rated trailers and equipment to transport the tractor and implement. Consult an authorized dealer to determine the proper equipment required. Using adequately sized chains, heavy duty straps, cables and/or binders, securely tie down both the front and rear of the tractor utilizing the proper tie down locations as specified by the tractor manufacturer.

  • Page 139: Troubleshooting Guide

    OPERATION 15. TROUBLESHOOTING GUIDE Problem Possible Cause Remedy The disk carrier bar vibrates 1. The nylon bushings of the joints 1. Replace the bushings. too much during work in question are overworn or completely worn out. 2. The pins and/or respective 2.
  • Page 140 OPERATION The stubble is too high or too 1. The disk carrier bar does not tilt 1. Use turnbuckle 1 on the third point sparse. correctly. to adjust the tilt. The stubble is not the same 1. The disk carrier bar tilts too much. 1. Reduce the tilt of the disk carrier bar. 2.

  • Page 141: Maintenance Section

    MAINTENANCE SECTION Maintenance Section 5-1 © 2019 Alamo Group Inc.

  • Page 142: Disk And Blade Maintenance

    When replacements are necessary, use only Bush Hog recommended parts. Use of parts not approved by Bush Hog could void the warranty. Worn, bent or blunt blades will require more power. To cut efficiently, replace worn or damaged blades as soon as possible.
  • Page 143 MAINTENANCE 2. The clamp parts should be replaced when: • The screw to fasten the knives is bent or too worn out below the head. • The self-tapping layer 1 of the screw to fasten the knives is missing or too worn out. We advise changing the screw after it has been tightened 5 times.

  • Page 144: Disc Replacement

    MAINTENANCE Disc Replacement Reinstalling Disc Assemblies: ALWAYS REPLACE BLADES AND BLADE FASTENERS IN PAIRS TO MAINTAIN BALANCE. VIBRATION MAY LEAD TO COMPONENT FAILURE. The oval disks are splined to a shaft and have to be positioned so that the main axle is at right angles with next to it.

  • Page 145: Lubrication

    MAINTENANCE LUBRICATION Driveshaft and Mower Change the oil in the disk carrier bar and gearbox after the first 50 hours of use. After this first change, we advise changing the oil every 100 working hours or at least once a year. •...
  • Page 146 MAINTENANCE Disk Carrier Bar Use SAE EP 80 W 90 oil in quantities listed: Model DHM8......0.77 Gallons Model DHM9......0.95 Gallons Model DHM10......1 Gallon Oil is added and the oil level is checked when the disk carrier bar is vertical (it MUST be in the vertical position for at least 5 minutes).

  • Page 147: Storage

    MAINTENANCE STORAGE To prepare your Disc Mower for storage: 3. Clean the mower of all dirt and debris. 4. Drain the oil from the cutter bar and replace with fresh SAE EP 80 W 90 lube oil. (See Lubrication Instructions) 5.
  • Page 148 MAINTENANCE DHM 8, 9, 10 05/19 Maintenance Section 5-8 © 2019 Alamo Group Inc.
  • Page 149 TO THE OWNER/OPERATOR/DEALER To keep your implement running efficiently and safely, read your manual thoroughly and follow these directions and the Safety Messages in this Manual. The Table of Contents clearly identifies each section where you can easily find the information you need. The OCCUPATIONAL SAFETY AND HEALTH ACT (1928.51 Subpart C) makes these minimum safety...
  • Page 150 DISC MOWER DHM8, DHM9, & DHM10 DHM7,8, 9, 10 - 05/19 P/N50078287 Printed U.S.A...

This manual is also suitable for:

Dhm8Dhm9Dhm10

Table of Contents