Bush Hog DHM7 Operator's Manual
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Bush Hog DHM7 Operator's Manual

Disc mower
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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
    • Crossing Ditches and Steep Inclines
    • 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 Mower
    • Transporting the Tractor and Implement
    • 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

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Published 05/21
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 the
Safety and 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
© 2021 Alamo Group Inc.
MOWER
Important Operating
and Safety
Instructions are
found in the Mower
Safety Video that can
be instantly
accessed on the
internet at:
www.algqr.com/bve
DISC
DHM7
Part No. 50078281
$0.00

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  • Page 1 DISC MOWER DHM7 Published 05/21 Part No. 50078281 OPERATOR’S MANUAL This Operator's Manual is an integral Important Operating part of the safe operation of this and Safety machine and must be maintained Instructions are with the unit at all times. READ,...
  • 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 FEDERAL LAWS AND REGULATIONS ......................1-21 INTRODUCTION SECTION ....................2-1 ASSEMBLY SECTION ....................... 3-1 TECHNICAL NOTES TO AID IN ASSEMBLY OF DHM7 ................. 3-2 Pins and Screws ............................... 3-2 Shims, Spacers, Bushings and Washers ......................3-2 Nuts, Grease Nipples ............................3-2 ..................................

  • Page 8: Table Of Contents

    Crossing Ditches and Steep Inclines ......................4-23 OPERATING THE TRACTOR AND IMPLEMENT ..................4-25 Foreign Debris Hazards ..........................4-26 Bystanders/Passersby Precautions ........................ 4-26 Engaging the Power Take Off (PTO) ......................4-27 PTO RPM and Ground Speed ........................4-28 Operating the Mower ............................4-28 Shutting Down the Implement .........................
  • Page 9 SAFETY SECTION Safety Section 1-1...
  • Page 10 Safety Messages. Always use good common sense to avoid hazards. (SG-2) Si no lee ingles, pida ayuda a alguien que si lo lea para que le traduzca las medidas de seguridad. (SG-3) Operator Safety Instructions and Practices DHM7 05/21 Safety Section 1-2 © 2021 Alamo Group Inc.
  • Page 11 Always read carefully and comply fully with the manufacturer’s instructions when handling oil, solvents, cleansers, and any other chemical agent. (SG-22) KEEP AWAY FROM ROTATING ELEMENTS to prevent entanglement and possible serious injury or death. (SG-24) DHM7 05/21 Safety Section 1-3 © 2021 Alamo Group Inc.
  • Page 12 Avoid contact with hot surfaces of the engine or muffler. Use gloves and eye protection when servicing hot components. Contact with a hot surface or fluid can cause serious injury from burns or scalding. (SG-38) DHM7 05/21 Safety Section 1-4 © 2021 Alamo Group Inc.
  • Page 13 (ROPS). Always wear seat belts. Serious injury or even death could result from falling off the tractor, particularly during a turnover when the operator could be pinned under the ROPS. (SG-7) DHM7 05/21 Safety Section 1-5 © 2021 Alamo Group Inc.
  • Page 14 REMOVE the HOSE and have it tested at a Dealer. If oil does penetrate the skin, have the injury treated immediately by a physician knowledgeable and skilled in this procedure. (SG-15) DHM7 05/21 Safety Section 1-6 © 2021 Alamo Group Inc.
  • Page 15 Do not operate this machine with anyone in the immediate area. Stop mowing if anyone is within 300 feet of mower. (SGM-02) DHM7 05/21 Safety Section 1-7 © 2021 Alamo Group Inc.
  • Page 16 Never mow an area that you have not inspected and removed debris or foreign material. (SGM-08) Do not mow with two machines in the same area except with Cab tractors with the windows closed. (SGM-11) DHM7 05/21 Safety Section 1-8 © 2021 Alamo Group Inc.
  • Page 17 -The area to be cut has been cleared of foreign material such as rocks, cans, glass, and debris. NOTE: This Disc mower is not to be used for highway maintenance. (SDM-1) DHM7 05/21 Safety Section 1-9 © 2021 Alamo Group Inc.
  • Page 18 Do not transport unless 3-Point lift lever is fully raised and in the latched transport position. Dropping implement in transport can cause serious damage to the tractor and/or Implement and possibly cause the operator or others to be injured or killed. (S3PT-02) DHM7 05/21 Safety Section 1-10 © 2021 Alamo Group Inc.
  • Page 19 Make certain that at least 20% of the tractor’s weight is on the front wheels to maintain safe steerage. Slow down on rough or uneven surfaces. (STI-01) DHM7 05/21 Safety Section 1-11 © 2021 Alamo Group Inc.
  • Page 20 (S3PT-11) Always maintain the safety signs in good readable condition. If the safety signs are missing, damaged, or unreadable, obtain and install replacement safety signs immediately. (SG-5) DHM7 05/21 Safety Section 1-12 © 2021 Alamo Group Inc.
  • Page 21 Be alert to worn component surfaces which have sharp edges. Sharp surfaces can inflict severe laceration injuries if proper hand protection is not worn. (SG-37) DHM7 05/21 Safety Section 1-13 © 2021 Alamo Group Inc.
  • 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 Messages and operation instruction in each of the appropriate sections of the Tractor and Equipment Manuals. Pay close attention to the Safety Signs affixed to the Tractor and Equipment. (SG-18) DHM7 05/21 Safety Section 1-15 © 2021 Alamo Group Inc.
  • 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 Bush Hog Gen. Parts, Cali Prop 65 50065309 LOGO Bush Hog Decal 3.25” x 14.85” 50078273 LOGO DHM7 Model Decal Serial Number Plate SERIAL...
  • Page 26 SAFETY Decals DHM7 05/21 Safety Section 1-18 © 2021 Alamo Group Inc.
  • Page 27 SAFETY DHM7 05/21 Safety Section 1-19 © 2021 Alamo Group Inc.
  • Page 28 SAFETY DHM7 05/21 Safety Section 1-20 © 2021 Alamo Group Inc.
  • Page 29 Some regulations specify that no one under the age of 16 may operate power machinery. It is your responsibility to know what these regulations are in your own area or situation. (Refer to U.S. Dept. of Labor, Employment Standard Administration, Wage & Home Division, Child Labor Bulletin #102.) DHM7 05/21 Safety Section 1-21 © 2021 Alamo Group Inc.
  • Page 31 Contents Acknowledgment ......2 Foreword ........2 Safety Alerts.

  • Page 32: 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 33: 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 34: 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 35 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 36 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 37 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 38: 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 39 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 40 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 41 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 42: 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 43 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 44 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 45 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 46 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 47: 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 48: 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 49 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 50 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 51 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 52 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 53 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 54 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 55: 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 57: Reconocimiento

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

  • Page 58: 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 59: 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 60: 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 61 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 62 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 63 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 64: 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 65 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 66 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 67 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 68: 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 69 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 70 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 71 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 72 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 73: 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 74: 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 75 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 76 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 77 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 78 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 79 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 80 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 81: 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 © 2021 Alamo Group Inc.
  • Page 84 Indicates an imminently hazardous situation that, if not avoided, MAY result in MINOR INJURY. Identifies special instructions or procedures that, if not strictly observed, could result in damage to, or destruction of the machine, attachments or the environment. DHM7 05/21 Introduction Section 2-2 © 2021 Alamo Group Inc.
  • Page 85 Slow down on hills, rough terrain, and curves. The front, rear, left, and right are determined by the normal direction of travel, the same as driving an automobile. DHM7 05/21 Introduction Section 2-3 © 2021 Alamo Group Inc.
  • 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 OF DHM7 The 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.
  • Page 91 5. Use pin 14 D 25 - 19 x 45 - 67 (D 1” - 3/4” x 2” - 2”3/4) to insert hydraulic cylinder 10 into support 11. Do not fasten at this stage. DHM7 05/21 Assembly Section 3-3 © 2021 Alamo Group Inc.
  • Page 92 7 (similar to DIN 127B) and ring nut 8. 5. Insert bushing 5 D 22 - 28 x 45 (D 7/8” - 1”1/8 x 1”3/4) into pin 6 for coupling (2nd class) to the tractor. DHM7 05/21 Assembly Section 3-4...
  • Page 93 8. Tie the rope to the safety latch 32 and then thread it through the steel circle 33 (see figure detail). 9. Remember to link the spring 34 to transport hook 32 (see figure detail). DHM7 05/21 Assembly Section 3-5...
  • Page 94 125A) and 14 (Ø9/24x2) into the hole on slide 1 and slot on conveyor sheet 6. 3. Use flat washer 14 (Ø9/24x2) and nut 13 and screw 8 to fasten screw 12 to support 7. DHM7 05/21 Assembly Section 3-6...
  • Page 95 14. (OPTIONAL) Mount conveyor 33 in the support 36 of screw 34 M 10 x 35 (DIN 933), washer 31 (DIN 125A), and nut 30 (M10); also use nut 39 (M12). Use the slot 35 to change the position of conveyor. DHM7 05/21 Assembly Section 3-7...
  • Page 96 ASSEMBLY DHM7 05/21 Assembly Section 3-8 © 2021 Alamo Group Inc.
  • Page 97 OPERATION SECTION Operation Section 4-1...
  • Page 98 DHM 7 DISC MOWER OPERATION INSTRUCTIONS Bush Hog’s latest edition of Hay Mower includes DHM7 Model with a mowing width of 7’ 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 99 Operating this Mower in an application for which it is not designed and/or operating the Mower with the wrong size Tractor can cause Mower component damage and equipment failure resulting in possible serious injury or death. (SGM-14) DHM7 05/21 Operation Section 4-3 © 2021 Alamo Group Inc.
  • Page 100 Serious injury or death to the operator or others could result if the operator is under the influence of drugs or alcohol. (SG-27) DHM7 05/21 Operation Section 4-4 © 2021 Alamo Group Inc.
  • Page 101 The power required to operate a mower is determined by the tractor PTO horsepower. For most mowing conditions, the DHM7 mower requires a tractor with at least 40 HP. Operating the mower with a tractor that does not have adequate power may damage the tractor engine. Exceeding 90 HP may cause mower damage by overpowering the unit in heavy cutting conditions.
  • Page 102 PTO output shaft and the driveline of the mower. An authorized tractor dealer can provide the over-running clutch and its installation if needed. OPS-U- 0006 DHM7 05/21 Operation Section 4-6 © 2021 Alamo Group Inc.
  • Page 103 (SG-11) Never allow children or other persons to ride on the Tractor or Implement. Falling off can result in serious injury or death. (SG-10) DHM7 05/21 Operation Section 4-7 © 2021 Alamo Group Inc.
  • Page 104 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) DHM7 05/21 Operation Section 4-8 © 2021 Alamo Group Inc.
  • Page 105 4. Use peg 3 to fasten the rest feet (fig. 10) in position 1. 5. Connect hoist chain 2 figure 14 to the tractor for the time being. DHM7 05/21 Operation Section 4-9 © 2021 Alamo Group Inc.
  • Page 106 14 of hole 13 (this last one is settled in the 3 point hitch). The choice of the ring, that has to be inserted in the slot, depends on the kind of tractor. This choice must assure a certain safety distance from the ground, during the transport. DHM7 05/21 Operation Section 4-10 © 2021 Alamo Group Inc.
  • Page 107 (with the safety device released), the cardan tubes must remain inserted at least 10 cm (4 inches). 6. Use the relevant chains to fasten the outer cardan shaft protection. DHM7 05/21 Operation Section 4-11 © 2021 Alamo Group Inc.
  • Page 108 3. Lift the disk carrier bar vertically along the cylinder run until pin 2 entirely enters the slot on hook 1 (fig. 12 item A). 4. Pull out the cylinder shaft slightly until it is well fastened. DHM7 05/21 Operation Section 4-12 © 2021 Alamo Group Inc.
  • Page 109 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 in fig. 14). Cutting height may vary within the range of 16/60 mm (0.63/2.36 inches) even thought uneven land may influence these values. DHM7 05/21 Operation Section 4-13 © 2021 Alamo Group Inc.
  • Page 110 Implement. Never work on the Implement with the tractor PTO driveline connected and running. Rotating Parts, or Drivelines could turn without warning and cause immediate entanglement, injury or death. (S3PT-11) DHM7 05/21 Operation Section 4-14 © 2021 Alamo Group Inc.
  • Page 111 Engine oil level and condition • Engine coolant level and condition • Power brake fluid level • Power steering fluid level • Fuel condition and level • Sufficient lubrication at all lube points DHM7 05/21 Operation Section 4-15 © 2021 Alamo Group Inc.
  • Page 112 Missing, broken, or worn items must be replaced at once to reduce the possibility of injury or death from thrown objects, entanglement, or blade contact. (SGM-3) DHM7 05/21 Operation Section 4-16 © 2021 Alamo Group Inc.
  • Page 113 300 feet. When the blades are replaced, the fastening hardware must be replaced. Check and retighten the blade hardware after the first eight hours of operation. DHM7 05/21 Operation Section 4-17 © 2021 Alamo Group Inc.
  • Page 114 Failure to replace abnormally worn blades may lead to catastrophic failure of the blades and ejection of the broken part with tremendous force which may cause serious bodily injury or death. DHM7 05/21 Operation Section 4-18 © 2021 Alamo Group Inc.
  • Page 115 Driveline yokes are securely attached to PTO & mower Blades are not chipped, cracked or bent Blade bolts are tight Transport lock is in good condition Operator’s Signature: DO NOT OPERATE an UNSAFE TRACTOR or MOWER DHM7 05/21 Operation Section 4-19 © 2021 Alamo Group Inc.
  • Page 116 The engine coolant fluid level is full The radiator is free of debris The air filter is in good condition Operator’s Signature:___________________________________________________ DO NOT OPERATE an UNSAFE TRACTOR or IMPLEMENT DHM7 05/21 Operation Section 4-20 © 2021 Alamo Group Inc.
  • Page 117 When operating in traffic always use the Tractor’s flashing warning lights and reduce your speed. Be aware of traffic around you and watch out for the other guy. (SG-19) DHM7 05/21 Operation Section 4-21 © 2021 Alamo Group Inc.
  • Page 118 When operating in traffic, always use the Tractor’s flashing warning lights and reduce your speed. Be aware of traffic around you and watch out for the other guy. DHM7 05/21 Operation Section 4-22 © 2021 Alamo Group Inc.

  • Page 119: Crossing Ditches And Steep Inclines

    Damage resulting from over-collapse of the driveline’s inner profile and its outer housing may allow the driveline to come loose from the Tractor which could cause bodily injury to the operator or bystanders and/or extensive damage to the Tractor or Implement. OPS-R-0020 DHM7 05/21 Operation Section 4-23 © 2021 Alamo Group Inc.
  • Page 120 Ground contact also produces a severe shock load on the mower drive and to the mower blades resulting in possible damage and premature wear. OPS-R-0022 DHM7 05/21 Operation Section 4-24 © 2021 Alamo Group Inc.

  • Page 121: Operating The Tractor And Implement

    Inspect the cutting area for such objects before mowing. Remove any like object from the site. Never allow the cutting blades to contact such items. (SGM-06) DHM7 05/21 Operation Section 4-25 © 2021 Alamo Group Inc.

  • Page 122: Foreign Debris Hazards

    If a bystander comes within 300 feet of the tractor while the mower is being operated, stop the tractor at once, idle the engine and disengage the PTO. Do not engage the PTO again until all bystanders are well past the 300 foot distance. OPS-R-0024 DHM7 05/21 Operation Section 4-26 © 2021 Alamo Group Inc.

  • Page 123: Engaging The Power Take Off (Pto)

    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) DHM7 05/21 Operation Section 4-27 © 2021 Alamo Group Inc.

  • Page 124: Pto Rpm And Ground Speed

    Mower input rotation speed must be about 540revs/minute. If the bar is working for long periods on sloping ground, it is recommended to hold the mower in the horizontal position for a few minutes every half hour of work. DHM7 05/21 Operation Section 4-28 © 2021 Alamo Group Inc.
  • Page 125 Never mow on stony or rocky soils. While working the protective cover must always be in place with the front part of the protection lowered. Never lean on climb on the protective cover. DHM7 05/21 Operation Section 4-29 © 2021 Alamo Group Inc.

  • Page 126: Shutting Down The Implement

    OPS-U- 0016 DHM7 05/21 Operation Section 4-30 © 2021 Alamo Group Inc.

  • Page 127: Disconnecting The Mower From The Tractor

    Use the Tongue Jack for lifting the Implement only. Overloading the Tongue Jack can cause failure with possible serious bodily injury or even death. (STI-04) DHM7 05/21 Operation Section 4-31 © 2021 Alamo Group Inc.

  • Page 128: Mower Storage

    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. DHM7 05/21 Operation Section 4-32 © 2021 Alamo Group Inc.
  • Page 129 The total transport height of the machine measured from the ground, must not exceed the maximum height authorized by highway regulations. DHM7 05/21 Operation Section 4-33 © 2021 Alamo Group Inc.
  • Page 130 Use extreme caution and avoid hard applications of the tractor brakes when towing heavy loads at road speeds. Never tow the implement at speeds greater than 20 MPH (32 kph). OPS-U- 0018 DHM7 05/21 Operation Section 4-34 © 2021 Alamo Group Inc.

  • Page 131: Transporting On Public Roadways

    Consult an authorized tractor dealer for lighting kits and modifications available to upgrade the lighting on older tractor models. OPS-U- 0021 DHM7 05/21 Operation Section 4-35 © 2021 Alamo Group Inc.

  • Page 132: Hauling The Tractor And Implement

    Ensure that the load will be in compliance with the legal limits set for the areas that will be traveled through. OPS-U- 0024 DHM7 05/21 Operation Section 4-36 © 2021 Alamo Group Inc.
  • Page 133 If during transport a hard braking, sharp turning, or swerving action was performed, stop at the next safe location to inspect the security of the load. OPS-U- 0026 DHM7 05/21 Operation Section 4-37 © 2021 Alamo Group Inc.

  • Page 134: Troubleshooting Guide

    (danger of unhooking when it receives blows that are too strong for the machine structure) until hooking occurs at reasonable intervals only. DHM7 05/21 Operation Section 4-38 © 2021 Alamo Group Inc.
  • Page 135 The forge is pushed forward 1. The ventilating effect of the 1. Reduce power takeoff rotation before being cut. knives is too strong. speed and increase tractor forward movement speed. DHM7 05/21 Operation Section 4-39 © 2021 Alamo Group Inc.

  • Page 137: Maintenance Section

    MAINTENANCE SECTION Maintenance Section 5-1 © 2021 Alamo Group Inc.

  • Page 138: 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 139 E, higher than or equal to 3 mm (0.12 inches) • The height of the lock nut at any point whatsoever is less than or equal to 1/2 of the total nut height. DHM7 05/21 Maintenance Section 5-3 © 2021 Alamo Group Inc.

  • Page 140: Disc Replacement

    DM-0001). (A is the work moving direction). The second blade (if in good condition) can be used by putting it back turned up-side-down at the same side of the disk. DHM7 05/21 Maintenance Section 5-4 © 2021 Alamo Group Inc.

  • Page 141: Lubrication

    Use SAE EP 80 W 90 oil Check the level with the special rod on the drain/Filler plug when the bar is lying horizontally. Oil can be drained through the hole in cap when the bar is vertical. DHM7 05/21 Maintenance Section 5-5 © 2021 Alamo Group Inc.
  • Page 142 MAINTENANCE Disk Carrier Bar Use SAE EP 80 W 90 oil in quantities listed: Model DHM7......66 Gallons 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 143: Storage

    NOTE: These values apply to fasteners as received from supplier, dry or when lubricated with normal engine oil. They do not apply if special graphited or molydisulphide greases or other extreme pressure lubricants are used. This applies to both UNF fine and UNC coarse threads. DHM7 05/21 Maintenance Section 5-7 © 2021 Alamo Group Inc.
  • Page 144 MAINTENANCE DHM7 05/21 Maintenance Section 5-8 © 2021 Alamo Group Inc.
  • Page 145 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 146 DISC MOWER DHM 7 DHM7 05/21 P/N50078281 Printed U.S.A...

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