Case MDX71 Repair Manual
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Case MDX71 Repair Manual

Case MDX71 Repair Manual

Disc mowers
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MDX71, MDX81, MDX91
Disc Mowers
Repair Manual
87023825

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Summary of Contents for Case MDX71

  • Page 1 MDX71, MDX81, MDX91 Disc Mowers Repair Manual 87023825...
  • Page 2 The sections used through out all Case IH product Repair manuals may not be used for each product. Each Repair manual will be made up of one or several books. The sections listed above are the sections utilized for the MDX71, MDX81 and MDX91 Disc Mowers. 158 -- 3/03...

  • Page 3: Table Of Contents

    COMPLETE CONTENTS SECTION 00 - GENERAL INFORMATION Chapter 1 - General Information CONTENTS Section Description Page Precautionary Statements ............Safety .

  • Page 4: Description Page

    SECTION 00 - GENERAL INFORMATION Chapter 3 - Lubrication CONTENTS Section Description Page Lubrication ..............Recommended Lubricants .
  • Page 5 SECTION 31 - IMPLEMENT POWER TAKE-OFF Chapter 1 - PTO CONTENTS Section Description Page Implement Power Take-off (PTO) ..........Twist Lock - Disassembly .
  • Page 6 SECTION 39 - FRAMES Chapter 1 - Breakaway Link CONTENTS Section Description Page Disassembly ..............Inspection .
  • Page 7 SECTION 58 - ATTACHMENTS AND HEADERS Chapter 2 - Cutter Bar (Continued) CONTENTS Section Description Page Disc Module - Disassembly ........... . Disc Module - Assembly .
  • Page 9 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 SECTION 00 - GENERAL INFORMATION Chapter 1 - General Information CONTENTS Section Description Page Precautionary Statements ............Safety .

  • Page 10: Precautionary Statements

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 PRECAUTIONARY STATEMENTS PERSONAL SAFETY Throughout this manual and on machine decals, you will find precautionary statements (“DANGER”, “WARNING”, and “CAUTION”) followed by specific instructions. These precautions are intended for the personal safety of you and those working with you.

  • Page 11: Safety

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 SAFETY PRECAUTIONARY STATEMENTS A careful operator is the best operator. Most accidents can be avoided by observing certain precautions. To help prevent accidents, read the following precautions before operating this equipment. Equipment should be operated only by those who are responsible and instructed to do so.

  • Page 12: Ecology And The Environment

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 ECOLOGY AND THE ENVIRONMENT Soil, air, and water are vital factors of agriculture and 3. Modern oils contain additives. Do not burn life in general. When legislation does not yet rule the contaminated fuels and or waste oils in ordinary treatment of some of the substances which are heating systems.

  • Page 13: International Symbols

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 INTERNATIONAL SYMBOLS As a guide to the operation of your tractor, various universal symbols have been utilized on the instruments, con- trols, switches, and fuse box. The symbols are shown below with an indication of their meaning. Thermostart Position Radio...

  • Page 14: Hardware Torque Values

    Left and right are determined by standing behind the unit, looking in the direction of travel. The product identification number plate, 1, for the Models MDX71/81/91 is located on the left side of the main frame. 19986828 HARDWARE TORQUE VALUES Check the tightness of hardware periodically.
  • Page 15 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 MINIMUM HARDWARE TIGHTENING TORQUES IN NEWTON-METERS (FOOT POUNDS) FOR NORMAL ASSEMBLY APPLICATIONS HARDWARE AND LOCKNUTS METRIC CLASS 5.8 CLASS 8.8 CLASS 10.9 LOCKNUT NOMINAL UNPLATED PLATED UNPLATED PLATED UNPLATED PLATED CL.8 SIZE W/ZnCr...
  • Page 16 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 MINIMUM HARDWARE TIGHTENING TORQUES IN NEWTON-METERS (FOOT POUNDS) FOR NORMAL ASSEMBLY APPLICATIONS INCH HARDWARE AND LOCKNUTS SAE GRADE 2 SAE GRADE 5 SAE GRADE 8 LOCKNUTS NOMINAL UNPLATED PLATED UNPLATED PLATED UNPLATED PLATED...

  • Page 17: Installation Of Adjustable Fittings In Straight Threado Ring Bosses

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 INSTALLATION OF ADJUSTABLE FITTINGS IN STRAIGHT THREAD O RING BOSSES 1. Lubricate the O ring by coating it with a light oil or petroleum. Install the O ring in the groove adjacent to the metal backup washer which is assembled at the extreme end of the groove, 4.

  • Page 18: Pipe Thread Fitting Torque

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 PIPE THREAD FITTING TORQUE THREAD SIZE TORQUE (MAXIMUM) Before installing and tightening pipe fittings, clean 1/8″ - 27 13 N m (10 ft Ibs) ⋅ the threads with a clean solvent or Loctite cleaner 1/4″...
  • Page 19 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 Tractor Requirements The tractor must also be equipped with one remote The Model MDX71 disc mower is designed to fit trac- hydraulic circuit with a minimum of 104 bar (1500 tors with 540 RPM PTOs with standard ASAE Cate- PSI) and a maximum of 193 bar (2800 PSI).

  • Page 20: Attaching The Mower To The Tractor

    Attachment of the limit chains to the mower hitch differs on some models. Attaching the Model MDX71 1. Clean all paint or rust from the hitch pins. 2. Attach the mower hitch limit chains.
  • Page 21 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 Connect the mower to the tractor’s three-point hitch 1. Level the tractor’s 3-point hitch lift arms. NOTE: On tractors with Category II lift links, install the Category II bushings that were included with the mower onto the hitch pins.
  • Page 22 The assembly must have sufficient overlap so that the tubes do not separate when the breakaway system, 1, operates. NOTE: Most tractors will require the PTO to be shortened for MDX71 Disc Mower. To adjust the PTO assembly length to fit the tractor, do the following: A3679-24 1.
  • Page 23 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 6. On the front and the rear plastic shield tubes, measure the length from the end of each tube to the inner mark on the tube to be cut off. The length measured on each shaft should be about the same.
  • Page 24 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 IMPORTANT: The PTO set must be checked out prior to operation as follows: Check to be sure the shafts do not bottom out by • lifting and lowering the hitch and observing the free movement of he tubes when fully collapsed.
  • Page 25 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 Adjusting the Limit chains and height of the hitch Set the limit chain length and the height of the hitch pins as follows: 1. Level the tractor lower lift links from side-to-side. Adjust and lock the sway bars to remove as much side movement as possible.
  • Page 26 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 The hex-shaped hitch pins mounted on the bottom of the main frame arms can be adjusted to position the mower behind the tractor at different alignments to account for different tread widths of the tractor. To reposition the hitch pins to the proper location, do the following: 1.
  • Page 27 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 For tractors that measure 1092 mm (43″), • position the hitch pins to the left so that only the round pin protrudes on the right side of the main frame arms. This will position the mower towards the right, away from the right side tractor tire.
  • Page 28 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 4. Attach the top link to the tractor, 1, using the pin provided with the tractor top link. 5. Attach the top link to the mower, 2, in the front hole using the pin provided with the mower.
  • Page 29 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 To adjust the PTO assembly length to fit the tractor, do the following: 1. Separate the front part of the shaft, 1, from the 10 mm (3/8″ ″ ″ ″ ) rear part of the shaft, 2.
  • Page 30 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 10. Remove the burrs from the shaft ends with a file or grinder and remove all metal chips and filings from the shafts. 11. Apply grease to the inside of the outer telescoping tube before assembly.

  • Page 31: Setting Up The Flotation System

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 Remove the Jack Stand Remove the jack stand as follows: 1. Raise the mower with the tractor’s hydraulically controlled three-point hitch system. 2. Remove pin, 1, and remove the jack stand, 2. 3.

  • Page 32: Lowering The Cutter Bar For Field Operation

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 4. Raise the cutter bar with the tractor hydraulics until the transport latch, 1, is engaged. NOTE: Before raising the cutter bar with the hydraulic cylinder, make sure there is adequate clearance between the machine and the tractor.

  • Page 33: Transporting The Mower

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 2. Lower the mower into the operating position and place the tractor valve in the float position. This will allow the mower to follow the ground properly. Be sure the up-stop channel, 2, is positioned over the lift cylinder rod to limit the lift height while the curtain is down.

  • Page 34: Removing The Mower From The Tractor

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 REMOVING THE MOWER FROM THE TRACTOR To remove the mower from the tractor, do as follows: 1. Fold the front half of the cutter bar curtain, 1, rearward. 2. Secure the curtain with the rubber tie strap, 2. 3.
  • Page 35 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 4. Raise the tractor three-point hitch high enough to install the jack, 1, in the lift frame mount and install the pin, 2, to secure it. 5. Disconnect the limit chains, 3, from the rear of the tractor.

  • Page 36: Storing The Mower

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 STORING THE MOWER 1. Clean the mower. Grease all fittings. 2. Drain the oil from the bevel gearbox and all mod- ules and refill with new, clean oil to the correct level.

  • Page 37: Section 00 - General Information

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 2 SECTION 00 - GENERAL INFORMATION Chapter 2 - Adjustments CONTENTS Section Description Page Opening Fields ..............Field Cutting .

  • Page 38: Opening Fields

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 2 DANGER Fields can be opened the same way with a disc mow- er as with sickle bar-type mowers by cutting the back To prevent injury to bystanders, this mower is swath first;...
  • Page 39 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 2 DANGER During field operation, the tractor hydraulic valve should remain in the “Float” position, to allow the cut- Do not attempt to remove material from the disc ter bar to follow the ground contours. Raise the cutter mower while it is in operation.

  • Page 40: Operating Recommendations

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 2 OPERATING RECOMMENDATIONS WARNING Never operate the mower without the cutter bar curtain in place. 1. Never operate the mower without the covers, 1, on the rotating crop divider drums (optional left swathboard kit shown installed).

  • Page 41: Adverse Field Conditions

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 2 ADVERSE FIELD CONDITIONS WARNING Do not use this machine in rocky field conditions. Take extra care and precautions in rough, stony, or debris-ridden fields. Make the following adjustments to the mower in these conditions to minimize the pos- sibility of stones and foreign objects being deflected by cutting blades.

  • Page 42: Cutter Bar Flotation

    Distance of A3679-2 hitch pin hitch pin above ground- - above ground- - Standard with High Stubble kit MDX71 609 mm (24″) 660 mm (26″) MDX81, 457 mm (18″) 508 mm MDX91 (20″) NOTE: Raising the mower frame height will increase the flotation.
  • Page 43 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 2 A lighter cutter bar weight will reduce the pull on the tractor, but setting the flotation too light will prevent the cutter bar from staying on the ground at faster ground speeds.
  • Page 44 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 2 Loosen the jam nut, 1, and thread the rod out of the spring assembly until the hole is fully visible. Retighten the jam nut. IMPORTANT: Do not thread the rod out more than 114 mm (4-1/2 ″...

  • Page 45: Cutting Height

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 2 CUTTING HEIGHT Change the cutting height by tilting the angle of the cutter bar. Adjust top link length, 1, until the desired cutting height is obtained. To determine the cutting height, position a knife to the front of the cutter bar, and measure from it to the ground.
  • Page 46 A, as follows: MDX71 Disc Mower: 6-3/4″ MDX81 Disc Mower: 6-1/2″ MDX91 Disc Mower: 6-1/4″ If the disc mower is operated in rough terrain, and ex-...

  • Page 47: Right Swathboard (Standard)

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 2 RIGHT SWATHBOARD (STANDARD) The swathboard clearance to the end drum should be checked and adjusted, if necessary, any time the knives are turned or replaced, or if crop wrappage or spit out is occurring.
  • Page 48 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 2 Reduce the belt tension by loosening the locknut, 2, until the belt can be removed from the sheaves. Install the new belt onto the sheaves, and tighten the locknut until the spring length matches the length of gauge, 1.
  • Page 49 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 3 SECTION 00 - GENERAL INFORMATION Chapter 3 - Lubrication CONTENTS Section Description Page Lubrication ..............Recommended Lubricants .

  • Page 50: Lubrication

    The use of proper fuels, oils, grease and filters, as well as keeping the systems clean, will also extend machine and component life. IMPORTANT: Always use genuine Case IH replacement parts, oils and filters to ensure proper operation, filtra- tion of engine and hydraulic systems. See your Case IH dealer for additional quantities.

  • Page 51: Grease Fittings

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 3 CAUTION The cutter bar should be resting on the ground during lubrication or maintenance. NOTE: The machine should be checked daily for oil leaks. Any leak should be fixed immediately. NOTE: Clean the area around all plugs and grease fittings prior to removing or greasing.

  • Page 52: Bevel Gearbox Breather

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 3 BEVEL GEARBOX BREATHER Check and clean the bevel gearbox breather, 1, ev- ery 200 hours or yearly, whichever occurs first. 19990604 DRIVE MODULE Check the drive module oil every 50 hours. The oil level should be at the bottom of check plug, 1.

  • Page 53: Cutter Bar Modules

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 3 CUTTER BAR MODULES Check the module oil every 50 hours. Each module must be checked. The cutter bar must be level from side to side and front to back. Park on a level surface and adjust the top link to level cutter bar.

  • Page 54: Grease Fittings

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 3 To change the oil on models without the oil drain access hole in Figure 6, the skid shoe must first be removed by removing two bolts at 1. To change the oil, remove the skid shoe by re- moving the two bolts at 1.
  • Page 55 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 3 Grease the cutter bar pivots, 1, daily. Pump grease into pivots until grease can be seen coming out past seals. NOTE: Grease zerks are located on both top and bottom of pivot arms. A3679-8 Grease the breakaway pawl, 1, every 40 hours.
  • Page 56 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 3 00-8...

  • Page 57: Section 00 - General Information

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 4 SECTION 00 - GENERAL INFORMATION Chapter 4 - Troubleshooting CONTENTS Section Description Page Troubleshooting ..............00-1...
  • Page 58 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 4 PROBLEM POSSIBLE CAUSE CORRECTION Vibration. PTO shaft or U-joint damage. Inspect and repair PTO shaft. Material buildup in cutter bar drums. Remove top cover and clean out drums. Cutter bar components damaged or missing.
  • Page 59 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 4 PROBLEM POSSIBLE CAUSE CORRECTION Stubble too long. Incorrect angle on cutter bar. Change cutter bar angle. Ground speed too fast. Reduce ground speed. Worn or damaged knives. Replace knives. Low PTO speed. Run PTO at 540 RPM (do not over- spend).
  • Page 60 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 4 00-4...

  • Page 61: Section 00 - General Information

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 5 SECTION 00 - GENERAL INFORMATION Chapter 5 - Specifications CONTENTS Section Description Page Specifications ..............00-1...

  • Page 62: Specifications

    (1200 lbs.) (1405 lbs.) (1535 lbs.) * Transport height is based on hitch pins being 609 mm (24″) above ground on Model MDX71 and 457 mm (18″) above ground on Models MDX81 and MDX91 as specified earlier in this manual. 00-2...

  • Page 63: Description Page

    SECTION 31 - - IMPLEMENT POWER TAKE-OFF - - CHAPTER 1 SECTION 31 - IMPLEMENT POWER TAKE-OFF Chapter 1 - PTO CONTENTS Section Description Page Implement Power Take-off (PTO) ..........Twist Lock - Disassembly .

  • Page 64: Section 31 - Implement Power Take-Off

    1, to transfer power to the mower. There are two versions of PTO driveshafts used; the MDX71 and MDX81 disc mowers use a standard duty 540 PTO driveshaft, while the MDX91 disc mow- er uses a heavy duty 540 PTO driveshaft. Both drive-...

  • Page 65: Twist Lock - Disassembly

    SECTION 31 - - IMPLEMENT POWER TAKE-OFF - - CHAPTER 1 TWIST LOCK - DISASSEMBLY 1. Remove the PTO shaft from the unit by rotating the collar, 1, counterclockwise until the PTO shaft can be slid off the pivoting jackshaft on the mower.

  • Page 66: Twist Lock - Assembly

    SECTION 31 - - IMPLEMENT POWER TAKE-OFF - - CHAPTER 1 TWIST LOCK - ASSEMBLY 1. Slide the retaining pin, 1, into the bore in the yoke, and work the spring, 2, on over the end of the pin. NOTE: The spring has a large and small end. Install the large end over the pin first, and work the small end over the end of the pin.

  • Page 67: Disassembly

    SECTION 31 - - IMPLEMENT POWER TAKE-OFF - - CHAPTER 1 OVERRUNNING CLUTCH - DISASSEMBLY 1. Disassemble the twist lock by removing the snap ring, 1, and sliding off the collar, 2. Spread the open ends of the inner cover until it can be re- moved from the overrunning hub.
  • Page 68 SECTION 31 - - IMPLEMENT POWER TAKE-OFF - - CHAPTER 1 2. Install the bushing, 1, by spreading it and sliding it over the yoke. Align the tabs, 2, on the bushing with the notches in the inner overrunning hub. 3.

  • Page 69: Shielding - Disassembly

    SECTION 31 - - IMPLEMENT POWER TAKE-OFF - - CHAPTER 1 SHIELDING - DISASSEMBLY 1. Pry out the shield clip, 1, using a flat bladed screwdriver. 600-3-17 2. Use a small flat bladed screwdriver or pick to pry the shield bearings, 1, upwards out of the notches in the shield bell, and then pull them out of the shield.

  • Page 70: Shielding - Assembly

    SECTION 31 - - IMPLEMENT POWER TAKE-OFF - - CHAPTER 1 SHIELDING - ASSEMBLY 1. Slide the shield tube, 1, and bell, 2, onto the shaft. Note that the tube has notches which fit over ribs on the bell to properly align the parts. 2.

  • Page 71: U-Joints - Disassembly

    SECTION 31 - - IMPLEMENT POWER TAKE-OFF - - CHAPTER 1 U-JOINTS - DISASSEMBLY 1. Remove the PTO shaft from the unit, and remove the shielding, as previously described. Remove the internal snap rings, 1, from the yoke ears, and remove the grease zerk, 2, from the bearing cup.

  • Page 72: U-Joints - Inspection

    SECTION 31 - - IMPLEMENT POWER TAKE-OFF - - CHAPTER 1 U-JOINTS - INSPECTION NOTE: The U-joint cross and bearings should be re- placed any time the U-joint is disassembled, even if the cross and bearings were not the source of failure. 1.

  • Page 73: Pto Shaft Tube Replacement

    Refer to Section 1 “General Informa- tion” in this manual for information on matching the PTO shaft to the tractor. 2. On the female tube section of the MDX71/81 driveshaft, a plastic grease bushing, 1, must be removed and installed on the new tube. Remove...
  • Page 74 SECTION 31 - - IMPLEMENT POWER TAKE-OFF - - CHAPTER 1 3. The grease bushing, 1, is retained on the tube with two burrs, 2; install the bushing onto the new tube and lightly tap it until it is seated. 600-3-29 31-12...
  • Page 75 SECTION 31 - - IMPLEMENT POWER TAKE-OFF - - CHAPTER 2 SECTION 31 - IMPLEMENT POWER TAKE-OFF Chapter 2 - Jackshaft CONTENTS Section Description Page Belt Tension Jackshaft - Disassembly ..........Belt Drive Jackshaft - Assembly .
  • Page 76 SECTION 31 - - IMPLEMENT POWER TAKE-OFF - - CHAPTER 2 BELT TENSION JACKSHAFT - DISASSEMBLY 1. Remove the PTO shaft from the front of the jack- shaft by twisting the locking ring, 1, counterclock- wise and sliding the PTO shaft, 2, off. A3679-29 2.
  • Page 77 SECTION 31 - - IMPLEMENT POWER TAKE-OFF - - CHAPTER 2 3. Remove the snap ring, 1, retaining the front jack- shaft bearing. 600-3-2 4. Remove the rear belt drive shielding by removing the four locknuts, 1, and flat washers, and lift the shield off.
  • Page 78 SECTION 31 - - IMPLEMENT POWER TAKE-OFF - - CHAPTER 2 8. Install a three jaw puller to pull on the sheave in- ner hub; thread a 3/8″ x 1″ cap screw, 1, back into the end of the shaft, or position a shaft protector to protect the end of the shaft.
  • Page 79 SECTION 31 - - IMPLEMENT POWER TAKE-OFF - - CHAPTER 2 11. Clean the front of the jackshaft using emery cloth. Position the jackshaft in a vise, and drive the front bearing, 1, off the shaft. 600-3-6 BELT DRIVE JACKSHAFT - ASSEMBLY 1.
  • Page 80 SECTION 31 - - IMPLEMENT POWER TAKE-OFF - - CHAPTER 2 4. Install the front bearing snap ring, 1. 600-3-2 5. Install the front PTO shielding, 2, using the two previously removed cap screws and locknuts, 1. 6. Install the key, 1, into the keyway in the shaft. Slide the drive sheave, 2, onto the rear of the jackshaft, aligning it with and sliding it over the key.
  • Page 81 SECTION 31 - - IMPLEMENT POWER TAKE-OFF - - CHAPTER 2 7. Use a straight edge to align the drive sheave with the driven sheave within 1/16″. Once the sheave is properly aligned, tighten the setscrews, 3, Fig- ure 44, and jamnuts to retain the sheave. A3679-27 8.
  • Page 82 SECTION 31 - - IMPLEMENT POWER TAKE-OFF - - CHAPTER 2 31-8...
  • Page 83 SECTION 35 - - HYDRAULIC SYSTEM - - CHAPTER 1 SECTION 35 - HYDRAULIC SYSTEM Chapter 1 - Cylinders CONTENTS Section Description Page Disassembly ..............Inspection .

  • Page 84: Chapter 1 - Cylinders

    SECTION 35 - - HYDRAULIC SYSTEM - - CHAPTER 1 CYLINDERS The lift cylinder used on the disc mowers is a single acting cylinder, and is repairable. A screw-in orifice (0.040″) plate is installed in the inlet port to control the speed of stroke of the cylinder.

  • Page 85: Inspection

    SECTION 35 - - HYDRAULIC SYSTEM - - CHAPTER 1 3. Disconnect the rod end of the cylinder from the lift links by removing the cotter pin and sliding out the shoulder pin, 1. Remove the cutter bar lift stop channel, 2, and set it aside. Pull the com- plete piston rod assembly out of the cylinder bar- rel, and let the cylinder barrel hang from its mount.

  • Page 86: Assembly

    SECTION 35 - - HYDRAULIC SYSTEM - - CHAPTER 1 3. Inspect the cylinder barrel for damage to the bore surface. If necessary, remove the cylinder barrel from the unit and wash out any contamination. To remove the cylinder barrel, remove the retain- ing cap screw, 1, and slide the pin, 2, out of the casting.
  • Page 87 SECTION 35 - - HYDRAULIC SYSTEM - - CHAPTER 1 4. Lubricate the cylinder barrel with oil, and careful- ly insert the complete piston rod assembly into the barrel, using caution not to damage the seals on the retaining ring groove. Push the cylinder head, 1, into the cylinder barrel far enough to ex- pose the retaining ring groove, and install retain- ing ring, 2.
  • Page 88 SECTION 35 - - HYDRAULIC SYSTEM - - CHAPTER 1 35-6...
  • Page 89 SECTION 39 - - FRAMES - - CHAPTER 1 SECTION 39 - FRAMES Chapter 1 - Breakaway Link CONTENTS Section Description Page Disassembly ..............Inspection .

  • Page 90: Disassembly

    SECTION 39 - - FRAMES - - CHAPTER 1 DISASSEMBLY 1. Lower the mower onto a flat level surface. Re- move the cotter pins and slide the pins, 1, out to remove the breakaway link assembly, 2, from the mower. 2.
  • Page 91 SECTION 39 - - FRAMES - - CHAPTER 1 3. Remove the two whiz nuts, 1, and cap screws holding the slide stop, 2, to the channel. The slide assembly, 3, may now be pulled out of the channel. 4. Flip the channel over in the vise, and remove the two cap screws, 1, and washers.

  • Page 92: Inspection

    SECTION 39 - - FRAMES - - CHAPTER 1 INSPECTION Inspect the breakaway components for evidence of excessive wear or damage, and replace as neces- sary. Inspect the dog, 1, and pawl, 2, ramp surfaces for wear or galling. NOTE: If the dog ramp surface is worn, the dog can be installed to use the opposite ramp surface.
  • Page 93 3, over the spring rod, and seat it over the dog and the mounting stud, 4. Install the spring, 2, washer and nylon locknut, 1. Tighten the nut to obtain an initial spring length as follows: MDX71 disc mower: 172 mm (6-3/4″) MDX81 disc mower: 165 mm (6-1/2″) MDX91 disc mower: 159 mm (6-1/4″)
  • Page 94 SECTION 39 - - FRAMES - - CHAPTER 1 39-6...

  • Page 95: Section 58 - Attachments And Headers

    SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 1 SECTION 58 - ATTACHMENTS AND HEADERS Chapter 1 - Bevel Gearbox CONTENTS Section Description Page Removal ..............Disassembly .

  • Page 96: Removal

    SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 1 REMOVAL NOTE: The bevel gearbox is easier to remove if the mower is mounted to a tractor to support the main frame during disassembly. 1. Disconnect the flotation system by raising the cutter bar and removing the pin, 1, from the upper float rod.
  • Page 97 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 1 3. Lower the cutterbar onto blocks on a flat solid surface so that the cutterbar is supported several inches off the ground. The blocks should be placed under the #1 disc module and the end disc module.
  • Page 98 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 1 6. Disconnect the lift cylinder from the cutter bar lift links by removing the cotter pin and shoulder pin, 1. Remove the cutter bar lift stop channel, 2, and set it aside.
  • Page 99 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 1 9. Remove the outer belt shield by removing the four locknuts, 1, and flat washers. Back off on the spring adjuster nut, 2, to remove tension on the belt, and remove the belt from the sheaves. 600-30 10.

  • Page 100: Disassembly

    SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 1 13. Slide the inner shield, 1, out of the way, if it has not been previously removed. Pry the rear pivot arm off of the mounting bosses on the lift arm, slide it off of the gearbox cover and set it aside.
  • Page 101 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 1 3. The input shaft, 1, may stay in the gearbox, or come out with the cover; slide the shaft out of ei- ther component. Disassemble the input shaft by pressing the gear, 2, and outer bearing cone off of the shaft;...

  • Page 102: Reassembly

    SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 1 13/16″ (21mm) 19992986 REASSEMBLY Clean and inspect all parts. Replace bearings if any pitting or brinelling of bearing cup or cone is noticed. Inspect shafts for excessive wear or damage to splined surfaces, and for damage on bearing shoul- ders.
  • Page 103 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 1 During assembly of the bevel gearbox, it is important to be aware that all bearings, except for the front input shaft bearing, 1, are “low tolerance” bearings to pro- vide a specific stack height.
  • Page 104 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 1 2. Press a new bearing cone onto the pinion gear. Install the snap ring, 1, into the groove in the gearbox. Slide the bearing cup, 2, from the pinion gear bearing into the gearbox against the snap ring.
  • Page 105 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 1 5. Press the bearing cones onto the input shaft, and install the appropriate bearing cups into the housing and cover. Do not install the seal into the cover yet. Install the input shaft, 1, and cover, 2, onto the gearbox, and shim (shim pack thickness of 0.025″...

  • Page 106: Installation

    SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 1 INSTALLATION 1. Thoroughly clean all sealant residue off of the mounting surface, 1, on the drive module, and apply a thin coat of sealant to the entire surface. NOTE: If the mouning holes, 2, for the gearbox are elongated, the drive module should be replaced.
  • Page 107 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 1 4. Apply grease to the remaining “T-seal” washer, and install it on the bevel gearbox rear pivot hub, 1, so that it fits into the groove, 2. Install the rear pivot arm by sliding it over the input shaft onto the gearbox pivot hub, and at the same time fitting it over the two mounting bosses, 3, on the lift arm.
  • Page 108 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 1 8. Reinstall the belt onto the sheaves, and tighten the spring adjuster nut, 2, until the spring length, 1, matches the length of the gauge. Reinstall the outer belt shield using four locknuts and flat washers.
  • Page 109 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 1 11. Raise the cutter bar high enough so that blocks may be positioned under the #1 and end disc modules, to support the cutter bar off the floor. Remove the three cap screws, 1, from the front of the bevel gearbox, and slide the front lip of the inner skid shoe, 3, on over the front of the bevel gearbox and drive module.
  • Page 110 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 1 14. Slide the upper float rod, 1, through the upper mount, 2, ensuring that the long leg of the upper mount is to the left. NOTE: Ensure that the long leg of the upper mount is positioned to the left to prevent possible failure of the flotation system.

  • Page 111: Section 58 - Attachments And Headers

    SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 SECTION 58 - ATTACHMENTS AND HEADERS Chapter 2 - Cutter Bar CONTENTS Section Description Page Introduction ..............Discs .

  • Page 112: Introduction

    SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 INTRODUCTION The MDX71 disc mower uses a 5 disc cutter bar to provide a 6′ 8″ width of cut. The MDX81 disc mower ses a 6 disc cutter bar to pro- vide a 7′...
  • Page 113 All cutterbar components are interchangeable be- tween the disc mowers. The MDX71 and MDX91 disc mowers, because of the odd number of discs and the need for the end discs to be spinning inwards, have the #1 and #2 discs co-rotating;...

  • Page 114: Discs

    SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 DISCS Each time knives are replaced or turned, check the discs for damage and wear. If a disc is bent or cracked, replace it. When the leading edge of the disc wears thin, it can be used on an opposite rotating module to utilize the second face.

  • Page 115: Knife And Bolt Inspection

    SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 KNIFE AND BOLT INSPECTION Inspect the cutter bar daily for damaged compo- nents. The quality of cut and safety of operation de- pends on regular inspection of the cutter bar. Check the discs, knives, and hardware systematically for wear, damage or loose components.

  • Page 116: Knife Replacement

    6. The leading edge of the knives must be lower than the trailing edge. Refer to the accompanying drawing as to which way the discs turn. MDX91 MDX81 MDX71 58-6...
  • Page 117 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 7. Install the nut through the knife and insert the nut, 1, into the bottom of the discs aligning it with the slot in the disc. 8. Install the bolt protector, 2, and bolt, 1. Position the protector to a new area.

  • Page 118: Rock Guards

    SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 ROCK GUARDS Rock guards, 1, can be removed by removing bolts, Broken rock guards should be replaced immediately. Rock guards which are worn thin should be replaced before they break. SKID SHOES Skid shoes can be removed by removing bolts, 1.
  • Page 119 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 If a cutter bar failure is experienced, check the cutter It is also necessary to check the bevel gearbox bar components in the following sequence: and drive module components for damage. To do this, remove the outer belt shield, and hold the driven sheave while slowly rotating the #1 disc to A.

  • Page 120: Top Cap - Removal

    SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 TOP CAP - REMOVAL 1. Block the cutter bar discs in place with a hard- wood block to lock up the cutter bar, and remove the disc of the affected module by removing the four retaining bolts, 1, securing the disc and cov- er to the disc hub.

  • Page 121: Top Cap - Inspection

    SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 TOP CAP - INSPECTION 1. Inspect the top cap assembly, 1, for excessive play in bearings, bearing damage, and gear tooth damage. 2. Inspect the lower module assembly, 2, for evi- dence of damage to pinion gear teeth or exces- sive shaft movement in any direction.

  • Page 122: Top Cap - Installation

    SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 TOP CAP - INSTALLATION 1. Apply a thin bead of silicone sealant to the seal- ing flange of the new top cap assembly, 1, and position it on the lower module assembly with the breather facing to the right.
  • Page 123 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 Apply a thin coating of grease to the seal lip and surface on disc hub. Slide the disc hub onto the top cap shaft; if it is not perfectly timed to the adja- cent discs, remove the disc hub, rotate it 90°...

  • Page 124: Cutter Bar - Disassembly

    SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 CUTTER BAR - DISASSEMBLY 1. Remove the disc, rock guard and skid shoe from the module to be removed in order to gain access to the tie bolts. Loosen the tie bolts by installing the holding tools, 1, on one end of each tie bolt.

  • Page 125: Cutter Bar - Reassembly

    SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 CUTTER BAR - REASSEMBLY 1. Prior to reassembly, remove the connecting shafts, 1, from both spacers, and apply lubricant to both ends of the shafts. Reinstall the connect- ing shafts. 2.
  • Page 126 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 It may be necessary to determine the direction of rotation of a replacement module prior to instal- ling it in the cutter bar. Note that the pinion end of the lower module shaft has a groove, 1, in it to de- termine which side of the module the pinion gear is on;...
  • Page 127 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 Slide the disc hub, 1, onto the top cap shaft; if it is not perfectly timed to the adjacent discs, re- move the disc hub, rotate it 90° and reinstall it. Continue to do this until the disc hub is properly timed;...

  • Page 128: Disc Module - Disassembly

    SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 DISC MODULE - DISASSEMBLY 1. Remove the disc hub by removing the center re- taining bolt, 1. It will be easier to remove the disc hub if the bolt is loosened prior to removing the module from the cutter bar.
  • Page 129 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 4. Use a pair of snap ring pliers to carefully remove the slingers, 1, on each end of the lower module shaft. IMPORTANT: Use caution to prevent the tips of the slingers from contacting the sealing surface on the end of the shaft, or seal failure will occur.

  • Page 130: Disc Module - Assembly

    SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 DISC MODULE - ASSEMBLY The direction of rotation of an assembled module can be determined by looking at the ends of the lower Disc modules can be assembled for clockwise or module shaft;...
  • Page 131 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 1. Install a snap ring on the pinion side of module casting. Slide the bearing cup for the pinion side bearing into the housing bore against snap ring. Note that the direction of rotation desired will af- fect which side of housing you start on.
  • Page 132 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 4. Check the end play of the pinion shaft with the pinion side facing down, to ensure an accurate measurement. Rotate the shaft two complete revolutions to seat all components (bearing roll- ers in cage), and install a dial indicator to mea- sure shaft end play.
  • Page 133 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 6. Apply grease to the sealing lip on the shaft seal, and press them into place on each side of the housing. NOTE: The seal must be pressed into place with a seal installing tool or suitable substitute.

  • Page 134: Drive Module - Removal

    SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 DRIVE MODULE - REMOVAL NOTE: In order to remove the drive module, the disc mower must be mounted on a tractor to support the main frame during disassembly. The flotation system should be engaged by installing the pin, 1, into the float spring rod.
  • Page 135 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 4. Remove the inner skid shoe and shield by remov- ing the two rear cap screws, 1, Figure 54, retain- ing the inner skid shoe to the drive module; note that the right rear cap screw also retains the mounting bracket for the rear of the inner shield.
  • Page 136 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 6. Use the lift cylinder and tractor 3 point hitch to carefully lift the bevel gearbox and canopy sup- port away from the cutterbar. NOTE: The flotation system must be engaged to en- sure the bevel gearbox lifts up off the lower drive module.

  • Page 137: Drive Module - Installation

    SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 DRIVE MODULE - INSTALLATION 1. Prior to reassembly, remove the connecting shaft from the spacer, and apply lubricant to both ends of the shaft. Reinstall the connecting shaft. 2. Slide the drive module up against the spacer so that the connecting shaft splines into the pinion shaft, the tie bolts are properly positioned, and the drive module housing fits onto the aligning...
  • Page 138 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 5. Use a marker or scribe to mark the nut position relative to the spacer. Using wrench and a 3/4″ breaker bar, turn each nut 1/2 turn at a time to achieve 1-1/2 turns on each tie bolt, starting with the rear tie bolt first.
  • Page 139 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 Apply a locking compound to the threads, and install the three cap screws, 1, to secure the rear of the bevel gearbox to the drive module. Tighten the cap screws snugly, but do not torque at this time.

  • Page 140: Drive Module - Disassembly

    SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 11. Level the cutter bar, and check the oil level in the drive module by removing the check plug, 1: the oil level should be at the bottom of the threaded hole.
  • Page 141 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 3. Use a pair of snap ring pliers to carefully remove the slinger, 1, on the end of the pinion shaft. IMPORTANT: Use caution to prevent the tips of the slinger from contacting the sealing surface on the end of the shaft, or seal failure will occur.

  • Page 142: Drive Module - Assembly

    SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 CUTAWAY VIEW FROM FRONT OF MODULE DRIVE MODULE - ASSEMBLY The drive module must be assembled with the pinion gear, 1, positioned to the right side of the housing, as viewed from the rear, in order to ensure the cutter bar is driven in the correct direction.
  • Page 143 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 1. Thoroughly clean all sealant residue from the mating surfaces, 1, on the drive module housing. Inspect the pinion shaft, 2, for wear or damage on the seal surfaces, and for damage or excessive wear on the gear teeth or splined bores.
  • Page 144 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 4. Check the endplay of the pinion shaft, with the pinion side facing down, to ensure an accurate adjustment. Rotate the shaft two complete revo- lutions to seat all components (bearing rollers in cage), and install a dial indicator to measure the shaft endplay.
  • Page 145 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 7. Apply grease to the sealing lip on the shaft seal, 1, and press it into place on the right side of the housing. NOTE: The seal must be pressed into place with a seal installing tool or suitable substitute.
  • Page 146 SECTION 58 - - ATTACHMENTS AND HEADERS - - CHAPTER 2 58-36...
  • Page 147 SECTION 88 - - ACCESSORIES - - CHAPTER 1 SECTION 88 - ACCESSORIES Chapter 1 - Accessories CONTENTS Section Description Page Left Swathboard Kit ............. High Stubble Kit .
  • Page 148 SECTION 88 - - ACCESSORIES - - CHAPTER 1 LEFT SWATHBOARD KIT The left swathboard kit consists of a drum, 1, to install on the #1 disc, and a swathboard, 2, which mounts behind the #1 disc and drum. This moves the crop inward on the left side, providing a certain “windrowing”...
  • Page 149 SECTION 88 - - ACCESSORIES - - CHAPTER 1 Bolt the support leg to the mount plate using 1/2″ x 1-3/4″ carriage bolts, lock washers, and nuts at 1. As- semble the swathboard by attaching the rubber flap to the left side of the swathboard using three 3/8″ x 3/4″...
  • Page 150 1, are as close to (but not less than) 508 mm (20″) from the ground on Models MDX81 and MDX91. On Model MDX71, readjust the check chains so that the hitch pins, 1, are as close to (but not less than) 20″...
  • Page 151 SECTION 88 - - ACCESSORIES - - CHAPTER 1 KNIVES Several disc mower knives are available through Service Parts. Each type of knife is designed to func- tion well in specific crop and field conditions. Contact your authorized dealer for the disc mower knife that will work best in your conditions.
  • Page 152 SECTION 88 - - ACCESSORIES - - CHAPTER 1 88-6...
  • Page 153 SECTION 90 - - SAFETY DECALS - - CHAPTER 1 SECTION 90 - SAFETY DECALS Chapter 1 - Safety Decals CONTENTS Section Description Page Safety Decals ..............90-1...
  • Page 154 SECTION 90 - - SAFETY DECALS - - CHAPTER 1 SAFETY DECALS The following safety decals have been placed on and the operating instructions detailed in this manual your machine in the areas indicated. They are with your machine operators. intended for your personal safety and for those Keep the decals legible.
  • Page 155 SECTION 90 - - SAFETY DECALS - - CHAPTER 1 Part #86628571 Part #86624775 WARNING: To avoid personal injury, ensure WARNING: Operate the unit in such a manner that all rotating equipment has stopped before that stones or obstructions will not be lifting cover.
  • Page 156 SECTION 90 - - SAFETY DECALS - - CHAPTER 1 Part #849471 DANGER: Do not operate without all shields in place and in proper operating condition. Always inspect driveline and shields before operat- ing. Rotating driveline contact can cause death or serious injury. Part #849472 DANGER: Do not operate this unit with the shield missing.
  • Page 157 COMPLETE CONTENTS SECTION 00 - GENERAL INFORMATION Chapter 1 - General Information CONTENTS Section Description Page Precautionary Statements ............Safety .
  • Page 158 SECTION 00 - GENERAL INFORMATION Chapter 3 - Lubrication CONTENTS Section Description Page Lubrication ..............Recommended Lubricants .
  • Page 159 SECTION 31 - IMPLEMENT POWER TAKE-OFF Chapter 1 - PTO CONTENTS Section Description Page Implement Power Take-off (PTO) ..........Twist Lock - Disassembly .
  • Page 160 SECTION 39 - FRAMES Chapter 1 - Breakaway Link CONTENTS Section Description Page Disassembly ..............Inspection .
  • Page 161 SECTION 58 - ATTACHMENTS AND HEADERS Chapter 2 - Cutter Bar (Continued) CONTENTS Section Description Page Disc Module - Disassembly ........... . Disc Module - Assembly .

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Mdx81Mdx91

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