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Case IH MD72 Service Manual
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Case IH MD72 Service Manual

Case IH MD72 Service Manual

Disc mowers
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Summary of Contents for Case IH MD72

  • Page 3: Table Of Contents

    ..........Model MD72 .

  • Page 4: 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 5: General Information

    The serial number plate, 1, for the Models MD72, MD82, and MD92 is located on the left side of the main frame. Record this serial number in the space listed below.

  • Page 6: Tractor Requirements

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 Tractor Requirements The Model MD72 disc mower is designed to fit tractors with 540 rpm PTOs with standard ASAE Category I three-point hitches. The tractor must also have adjustable sway bars or a means of locking the lower lift arms from moving sideways.

  • Page 7: Attaching The Mower To The Tractor

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 ATTACHING THE MOWER TO THE TRACTOR Model MD72 1. Clean all paint or rust from the hitch pins. 2. Attach the plate on the end of the check chains to the outer end of frame hitch pins, 1, as required to clear obstructions on the tractor.
  • Page 8 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 7. The PTO assembly must be fitted to the tractor being used. The tubes must overlap at least 102 mm (4 in). At the same time, the tubes, 1 and 2, must be short enough so they do not bottom out.
  • Page 9 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 8. Attach the PTO assembly to the tractor. 9. Connect the hydraulic hose to the tractor, preferably to a valve section with a float position. Select the appropriate port to allow engaging the float position when lowering.
  • Page 10 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 12. Fold the front half of the cutter bar curtain, 1, rearward. Secure the curtain with the rubber tie strap, 2. Flip the cutter bar up-stop channel, 3, toward the cutter bar and against the brace. 19986836 13.

  • Page 11: Model Md82 And Md92

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 ATTACHING THE MOWER TO THE TRACTOR Models MD82 and MD92 Prior to installing the mower onto the tractor, the mower must be adjusted to match the tractor. Depending on the size of the tractor and the wheel spacing, it may be necessary to move the hex-shaped lower lift pins, 1.
  • Page 12 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 Measure from the center of the tractor to the right side of the right tire. For tractors that measure 940 mm (37 in) or less, position both hitch pins to the right so that only the round pin protrudes on the left side of the main frame arms.
  • Page 13 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 1. Clean all paint or rust from the hitch pins. 2. Attach the plate on the end of the check chains to the inner or outer end of frame hitch pins, 1, as required to clear obstructions on the tractor.
  • Page 14 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 7. The PTO assembly must be fitted to the tractor being used. The tubes must overlap at least 102 mm (4 in). At the same time, the tubes, 1 and 2, must be short enough so they do not bottom out.
  • Page 15 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 8. Attach the PTO assembly to the tractor. 9. Connect the hydraulic hose to the tractor, preferably to a valve section with a float position. Select the appropriate port to allow engaging the float position when lowering.
  • Page 16 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 12. Fold the front half of the cutter bar curtain, 1, rearward. Secure the curtain with the rubber tie strap, 2. Flip the cutter bar up-stop channel, 3, toward the cutter bar and against the brace. A3680-20r 13.

  • Page 17: Lowering The Cutter Bar For Field Operation

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 LOWERING THE CUTTER BAR FOR FIELD OPERATION NOTICE: Be sure the flotation pin, 1, is installed in the spring rod. NOTICE: Be sure the limit chains are attached and adjusted as explained earlier. 1.

  • Page 18: Transporting The Mower

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 TRANSPORTING THE MOWER 1. Fold the front half of the cutter bar curtain, 1, rearward. Secure the curtain with the rubber tie strap, 2. Flip the cutter bar up-stop channel, 3, toward the cutter bar and against the brace.
  • Page 19 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 2. Raise the cutter bar with the tractor hydraulics. Raise it high enough to engage the transport latch, 1. NOTICE: Before raising the cutter bar with the hydraulic cylinder, make sure there is adequate clearance be- tween the machine and the tractor.

  • Page 20: Storing The Mower

    3. Store the cutter bar in the operating position. 4. Remove the drive belt and store it in a dry place. 5. Clean the cutter bar rusted area and touch up with Case IH paint. Spray cans are available from your Case IH dealer. 00-18...

  • Page 21: Specifications

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 SPECIFICATIONS MD72 MD82 MD92 Cutter Bar Cutting Width ....2040 mm (6 ft 8 in)
  • Page 22 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 1 00-20...
  • Page 23 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 2 SECTION 00 - GENERAL INFORMATION Chapter 2 - Adjustments CONTENTS Section Description Page Opening Fields ............. Field Cutting .

  • Page 24: Opening Fields

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 2 DANGER OPENING FIELDS To prevent injury to bystanders, this mower is Fields can be opened the same way with a disc mower as with sickle bar-type mowers by cutting the not intended for roadside or municipal mowing.
  • Page 25 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 2 CAUTION During field operation, the tractor hydraulic valve should remain in the “Float” position, to allow the Do not operate the machine without all cutter bar cutter bar to follow the ground contours. Raise the shields down, cover skirts installed and in good cutter bar to clear obstacles or when turning on condition, and cover skirts snapped together.

  • Page 26: Operating Recommendations

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 2 OPERATING RECOMMENDATIONS CAUTION Do not operate the machine without all cutter bar shields down, cover skirts installed and in good condition, and cover skirts snapped together. Replace worn or damaged cover skirts. Failure to comply may result in minor or moderate injury.

  • Page 27: Cutter Bar Flotation

    Initially the flotation spring should be adjusted to a length, A, between the ends of the spring coils of 845 mm (33-1/4 in) for the MD72 disc mower or 902 mm (35-1/2 in) for the MD82 disc mower. The flotation spring can be lengthened or shortened as field conditions vary to achieve the flotation desired;...
  • Page 28 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 2 Lighter cutter bar weight will reduce pull on the tractor, but setting flotation too light will prevent the cutter bar from staying on the ground at faster ground speeds. The cutter bar weight may be felt by lifting on the right end of the canopy support, 1.
  • Page 29 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 2 Fully raise the cutter bar to the transport position. NOTICE: The flotation spring may slightly rub the canopy support top plate and/or the belt shielding when the mower is in the transport position. The hole in the flotation spring rod, 1, should be fully visible above the upper mount, in order to allow installation of the flotation engagement pin, 2.

  • Page 30: Cutting Height

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 2 NOTICE: If the pin is installed too far, the retaining ring may be knocked off and the pin may be lost, causing loss of flotation. With the mower cutter bar lowered onto flat ground, the flotation spring should measure approximately 921 mm (36-1/4 in) between the ends of the spring coils in order to provide the proper flotation for the...

  • Page 31: Breakaway Latch

    A, as follows: motion in the field. Excessive ground speed for field conditions. If MD72 Disc Mower: 6-3/4 inch the stubble height is erratic, and the mower is MD82 Disc Mower: 6-1/2 inch bouncing excessively, the operator is travelling MD92 Disc Mower: 6-1/4 inch too fast for the conditions.

  • Page 32: 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, anytime the knives are turned or replaced, or if crop wrappage or spit out is occurring. If adjustment is necessary, loosen nuts, 1 and 2, and position the swathboard for minimum clearance with the end drum ribs or the flighting on the auger end.
  • Page 33 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 34 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 2 00-12...
  • Page 35 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 3 SECTION 00 - GENERAL INFORMATION Chapter 3 - Lubrication CONTENTS Section Description Page Bevel Gearbox ............. Grease Fittings .

  • Page 36: Bevel Gearbox

    M1404 available from your Case IH dealer. NOTICE: The machine should be checked daily for Maintain oil level using Case IH Akcela 135 H EP oil leaks. Any leak should be fixed immediately. 80W90 gear oil. NOTICE: Clean the area around all plugs and grease NOTICE: Failure to use the correct specification of oil fittings prior to removing or greasing.

  • Page 37: Bevel Gearbox Breather

    Failure to comply may result in minor or moderate injury. M1497 Maintain oil level using Case IH Akcela 135 H EP 80W90 gear oil. DRIVE MODULE BREATHER Check and clean the drive module breather/fill plug, 2, every 200 hours or yearly, whichever occurs first.

  • Page 38: Cutter Bar Modules

    3. Remove the dipstick and observe the oil level. The level is correct when it is anywhere within the marked area at the end, 1, of the dipstick. Maintain the oil level using Case IH Akcela 135 H EP 80W90 gear oil. A3662-20...

  • Page 39: Grease Fittings

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 3 To change the oil on models without the oil drain access hole in Figure 51, the skid shoe must first be removed by removing two bolts at 1. To change the oil, remove the skid shoe by removing the two bolts at 1.
  • Page 40 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. NOTICE: Grease zerks are located on both top and bottom of pivot arms. A3679-8 Grease the breakaway pawl, 1, every 40 hours.
  • Page 41 ............. . MD72 .

  • Page 42: Md82, Md92

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 4 MD82, MD92 BREAKAWAY LINK Disassembly 1. Lower the mower onto a flat level surface. Remove the cotter pins and slide the pins, 1, out to remove the breakaway link assembly, 2, from the mower.
  • Page 43 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 4 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.

  • Page 44: Inspection

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 4 Inspection Inspect the breakaway components for evidence of excessive wear or damage, and replace as necessary. Inspect the dog, 1, and pawl, 2, ramp surfaces for wear or galling. NOTICE: If the dog ramp surface is worn, the dog can be installed to use the opposite ramp surface.
  • Page 45 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 4 2. Flip the channel over in the vise, and push the slide assembly into the channel. Lower the pawl, 3, over the spring rod, and seat it over the dog and the mounting stud, 4.

  • Page 46: Md72

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 4 MD72 BREAKAWAY LINK Disassembly 1. Lower the mower onto a flat level surface. Remove the cap screw and nut, 1, out to remove the breakaway link assembly, 2, from the mower.
  • Page 47 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 4 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.

  • Page 48: Inspection

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 4 Inspection Inspect the breakaway components for evidence of excessive wear or damage, and replace as necessary. Inspect the dog, 1, and pawl, 2, ramp surfaces for wear or galling. NOTICE: If the dog ramp surface is worn, the dog can be installed to use the opposite ramp surface.
  • Page 49 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 of 6-3/4 inch for Model MD72 disc mowers. 600-7-2 3.
  • Page 50 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 4 00-10...
  • Page 51 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 5 SECTION 00 - GENERAL INFORMATION Chapter 5 - Troubleshooting CONTENTS Section Description Page Troubleshooting ..............00-1...

  • Page 52: High Stubble Kit (3-1/2 Inch To 5 Inch)

    SECTION 00 - - GENERAL INFORMATION - - CHAPTER 5 TROUBLESHOOTING 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 53 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 5 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 54 SECTION 00 - - GENERAL INFORMATION - - CHAPTER 5 00-4...
  • Page 55 SECTION 35 - - HYDRAULICS - - CHAPTER 1 SECTION 35 - - HYDRAULICS Chapter 1 - - Hydraulics CONTENTS Section Description Page Hydraulic Cylinders ............Disassembly .
  • Page 56 SECTION 35 - - HYDRAULICS - - CHAPTER 1 The lift cylinder is a single acting cylinder, and is re- pairable. A screw-in orifice (0.040 in) plate is installed in the inlet port to control the speed of stroke of the cylinder.
  • Page 57 SECTION 35 - - HYDRAULICS - - 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 complete piston rod assembly out of the cylinder barrel, and let the cylinder barrel hang from its mount.
  • Page 58 SECTION 35 - - HYDRAULICS - - 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 retaining cap screw, 1, and slide the pin, 2, out of the casting.
  • Page 59 SECTION 35 - - HYDRAULICS - - CHAPTER 1 4. Lubricate the cylinder barrel with oil, and carefully 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 expose the retaining ring groove, and install retaining ring, 2.
  • Page 60 SECTION 35 - - HYDRAULICS - - CHAPTER 1 35-6...
  • Page 61 SECTION 58 - DRIVELINES - CHAPTER 1 SECTION 58 - DRIVELINES Chapter 1 - Drivelines CONTENTS Section Description Page Twist Lock ..............Disassembly .
  • Page 62 SECTION 58 - DRIVELINES - CHAPTER 1 The MD72, MD82, and MD92 disc mowers use a telescoping 540 rpm PTO drive shaft, 1, to transfer power to the mower. There are two versions of PTO drive shafts used; the MD72 and MD82 disc mowers...

  • Page 63: Twist Lock

    SECTION 58 - DRIVELINES - CHAPTER 1 TWIST LOCK Disassembly 1. Remove the PTO shaft from the unit by rotating the collar, 1, counter-clockwise until the PTO shaft can be slid off the pivoting jackshaft on the mower. 600-3-8 2. Remove the external snap ring, 1, and slide the collar, 2, off.

  • Page 64: Assembly

    SECTION 58 - DRIVELINES - CHAPTER 1 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. NOTICE: 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 65: Overrunning Clutch

    SECTION 58 - DRIVELINES - 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 removed from the overrunning hub. 600-3-12 2.
  • Page 66 SECTION 58 - DRIVELINES - 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. Install the seal ring, 1, with the tapered side facing inwards to mate with the bushing.

  • Page 67: Shielding

    SECTION 58 - DRIVELINES - 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 68: Assembly

    SECTION 58 - DRIVELINES - CHAPTER 1 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. Slide the shield bearings, 1, through the notches and into the groove on the yoke, 3, Figure 17.

  • Page 69: U-Joints

    SECTION 58 - DRIVELINES - 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. 600-3-21 2.

  • Page 70: Inspection

    SECTION 58 - DRIVELINES - CHAPTER 1 Inspection NOTICE: The U-joint cross and bearings should be replaced anytime the U-joint is disassembled, even if the cross and bearings were not the source of failure. 1. Inspect the yoke ears, 1, for wear in the bearing area;...

  • Page 71: Pto Shaft Tube Replacement

    PTO shaft to the tractor. 600-3-21 2. On the female tube section of the MD72/MD82 drive shaft, a plastic grease bushing, 1, must be removed and installed on the new tube. Remove...

  • Page 72: Belt Tension Jackshaft

    SECTION 58 - DRIVELINES - 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 BELT TENSION JACKSHAFT Disassembly 1.
  • Page 73 SECTION 58 - DRIVELINES - CHAPTER 1 3. Remove the snap ring, 1, retaining the front jackshaft 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. 36091666 5.
  • Page 74 SECTION 58 - DRIVELINES - CHAPTER 1 8. Install a three jaw puller to pull on the sheave inner hub; thread a 3/8 inch x 1 inch cap screw, 1, back into the end of the shaft, or position a shaft protector to protect the end of the shaft.

  • Page 75: Belt Drive Jackshaft

    SECTION 58 - DRIVELINES - CHAPTER 1 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. Drive a new bearing, 1, Figure 39, onto the front of the jackshaft.
  • Page 76 SECTION 58 - DRIVELINES - CHAPTER 1 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 77 SECTION 58 - DRIVELINES - CHAPTER 1 7. Use a straight edge to align the drive sheave with the driven sheave within 1/16 inch. Once the sheave is properly aligned, tighten the setscrews, 3, Figure 44, and jamnuts to retain the sheave. A3679-27 8.
  • Page 78 SECTION 58 - DRIVELINES - CHAPTER 1 58-18...
  • Page 79 SECTION 58 - DRIVELINES - CHAPTER 2 SECTION 58 - DRIVELINES Chapter 2 - Bevel Gearbox CONTENTS Section Description Page Bevel Gearbox ............. Removal .

  • Page 80: Bevel Gearbox

    SECTION 58 - DRIVELINES - CHAPTER 2 BEVEL GEARBOX Removal NOTICE: 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 81 SECTION 58 - DRIVELINES - CHAPTER 2 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 82 SECTION 58 - DRIVELINES - CHAPTER 2 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. Retract the lift cylinder, and let it hang from the upper mount on the frame.
  • Page 83 SECTION 58 - DRIVELINES - CHAPTER 2 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. 36091666 10.

  • Page 84: Disassembly

    SECTION 58 - DRIVELINES - CHAPTER 2 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 85 SECTION 58 - DRIVELINES - CHAPTER 2 3. The input shaft, 1, may stay in the gearbox, or come out with the cover; slide the shaft out of either component. Disassemble the input shaft by pressing the gear, 2, and outer bearing cone off of the shaft;...

  • Page 86: Reassembly

    SECTION 58 - DRIVELINES - CHAPTER 2 21mm (13/16 in) 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 shoulders.
  • Page 87 SECTION 58 - DRIVELINES - CHAPTER 2 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 provide a specific stack height. These low tolerance bearings, in conjunction with the use of precision forged gears and precision machining of the gearbox housing, have eliminated the need for backlash...
  • Page 88 SECTION 58 - DRIVELINES - CHAPTER 2 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 89 SECTION 58 - DRIVELINES - CHAPTER 2 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 inch is a good starting point) between the housing to obtain the appropriate rolling torque...

  • Page 90: Installation

    SECTION 58 - DRIVELINES - CHAPTER 2 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. NOTICE: If the mounting holes, 2, for the gearbox are elongated, the drive module should be replaced.
  • Page 91 SECTION 58 - DRIVELINES - CHAPTER 2 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 92 SECTION 58 - DRIVELINES - CHAPTER 2 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 93 SECTION 58 - DRIVELINES - CHAPTER 2 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 94 SECTION 58 - DRIVELINES - CHAPTER 2 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. NOTICE: Ensure that the long leg of the upper mount is positioned to the left to prevent possible failure of the flotation system.
  • Page 95 SECTION 58 - DRIVELINES - CHAPTER 3 SECTION 58 - DRIVELINES Chapter 3 - Cutter Bar CONTENTS Section Description Page Introduction ..............Discs .

  • Page 96: Introduction

    SECTION 58 - DRIVELINES - CHAPTER 3 INTRODUCTION The MD72 disc mower uses a 5 disc cutter bar to provide a 6 foot 8 inch width of cut. The MD82 disc mower uses a 6 disc cutter bar to provide a 7 foot 10 inch width of cut.
  • Page 97 SECTION 58 - DRIVELINES - CHAPTER 3 If a problem is found with a specific module, the extent of the damage can be quickly determined by removing the disc and the top cap assembly, 1, of the affected module. If damage is limited to the top cap assembly components, the lower module can be flushed out to remove contaminants, and a new top cap assembly installed to complete the repair.

  • Page 98: Discs

    SECTION 58 - DRIVELINES - CHAPTER 3 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 99: Knife And Bolt Inspection

    SECTION 58 - DRIVELINES - CHAPTER 3 KNIFE AND BOLT INSPECTION Inspect cutter daily damaged components. The quality of cut and safety of operation depends on regular inspection of the cutter bar. Check the discs, knives, and hardware systematically wear, damage loose components.

  • Page 100: 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. MD72 MD82 MD92 36091665 58-6...
  • Page 101 SECTION 58 - DRIVELINES - CHAPTER 3 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 102: Rock Guards

    CUTTER BAR INSPECTION/FAILURE ANALYSIS In the event of a failure of the Case IH modular disc cutter bar, it is important to properly inspect the unit to determine the extent of the damage. A thorough examination will help to locate all the damaged components, and minimize unnecessary repair labor.
  • Page 103 SECTION 58 - DRIVELINES - CHAPTER 3 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 A.

  • Page 104: Top Cap

    SECTION 58 - DRIVELINES - CHAPTER 3 TOP CAP Removal 1. Block the cutter bar discs in place with a hardwood 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 cover to the disc hub.

  • Page 105: Inspection

    SECTION 58 - DRIVELINES - CHAPTER 3 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 evidence of damage to pinion gear teeth or excessive shaft movement in any direction.

  • Page 106: Installation

    SECTION 58 - DRIVELINES - CHAPTER 3 Installation 1. Apply a thin bead of silicone sealant to the sealing flange of the new top cap assembly, 1, and position it on the lower module assembly with the breather facing to the right. 19985741 2.
  • Page 107 SECTION 58 - DRIVELINES - CHAPTER 3 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 adjacent discs, remove the disc hub, rotate it 90° and reinstall it.

  • Page 108: Cutter Bar

    SECTION 58 - DRIVELINES - CHAPTER 3 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 #FNH01221-2, 1, on one end of each tie bolt.

  • Page 109: Reassembly

    SECTION 58 - DRIVELINES - CHAPTER 3 Reassembly 1. Prior to reassembly, remove the connecting shafts, 1, from both spacers, and apply lubricant to both ends of the shafts. Reinstall the connecting shafts. 2. It is necessary to time the cutter bar discs on either side of the replacement module during reassembly to eliminate interference between the knives.
  • Page 110 SECTION 58 - DRIVELINES - CHAPTER 3 It may be necessary to determine the direction of rotation of a replacement module prior to installing it in the cutter bar. Note that the pinion end of the lower module shaft has a groove, 1, in it to determine which side of the module the pinion gear is on;...
  • Page 111 SECTION 58 - DRIVELINES - CHAPTER 3 Slide the disc hub, 1, onto the top cap shaft; if it is not perfectly timed to the adjacent discs, remove the disc hub, rotate it 90° and reinstall it. Continue to do this until the disc hub is properly timed; one of the four positions will provide correct timing.

  • Page 112: Disc Module

    SECTION 58 - DRIVELINES - CHAPTER 3 DISC MODULE Disassembly 1. Remove the disc hub by removing the center retaining 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 113 SECTION 58 - DRIVELINES - CHAPTER 3 4. Use a pair of snap ring pliers to carefully remove the slingers, 1, on each end of the lower module shaft. NOTICE: 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 114: Assembly

    SECTION 58 - DRIVELINES - CHAPTER 3 Assembly Disc modules can be assembled for clockwise or The direction of rotation of an assembled module can counter-clockwise rotation of the disc. Before be determined by looking at the ends of the lower assembling a disc module it must be determined at module shaft;...
  • Page 115 SECTION 58 - DRIVELINES - CHAPTER 3 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 affect which side of housing you start on.
  • Page 116 SECTION 58 - DRIVELINES - CHAPTER 3 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 rollers in cage), and install a dial indicator to measure shaft end play.
  • Page 117 SECTION 58 - DRIVELINES - CHAPTER 3 6. Apply grease to the sealing lip on the shaft seal, and press them into place on each side of the housing. NOTICE: The seal must be pressed into place with a seal installing tool or suitable substitute. The seals must be flush with the side of the housing, and square to the shaft.

  • Page 118: Removal

    SECTION 58 - DRIVELINES - CHAPTER 3 Removal NOTICE: 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 119 SECTION 58 - DRIVELINES - CHAPTER 3 4. Remove the inner skid shoe and shield by removing the two rear cap screws, 1, Figure 54, retaining 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 120 SECTION 58 - DRIVELINES - CHAPTER 3 6. Use the lift cylinder and tractor 3 point hitch to carefully lift the bevel gearbox and canopy support away from the cutterbar. NOTICE: The flotation system must be engaged to ensure the bevel gearbox lifts up off the lower drive module.

  • Page 121: Installation

    SECTION 58 - DRIVELINES - CHAPTER 3 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 dowels...
  • Page 122 SECTION 58 - DRIVELINES - CHAPTER 3 5. Use a marker or scribe to mark the nut position relative spacer. Using wrench #FNH01221-3 and a 3/4 inch 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 123 SECTION 58 - DRIVELINES - CHAPTER 3 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 124: Disassembly

    SECTION 58 - DRIVELINES - CHAPTER 3 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. Add Case Akcela 135 H EP 80W90 gear oil as necessary through the breather/fill plug, 2, to obtain the correct oil level.
  • Page 125 SECTION 58 - DRIVELINES - CHAPTER 3 3. Use a pair of snap ring pliers to carefully remove the slinger, 1, on the end of the pinion shaft. NOTICE: 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 126: Assembly

    SECTION 58 - DRIVELINES - CHAPTER 3 CUTAWAY VIEW FROM FRONT OF 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 127 SECTION 58 - DRIVELINES - CHAPTER 3 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 128 SECTION 58 - DRIVELINES - CHAPTER 3 4. Check the endplay of the pinion shaft, with the pinion side facing down, to ensure an accurate adjustment. Rotate the shaft two complete revolutions to seat all components (bearing rollers in cage), and install a dial indicator to measure the shaft endplay.
  • Page 129 SECTION 58 - DRIVELINES - CHAPTER 3 7. Apply grease to the sealing lip on the shaft seal, 1, and press it into place on the right side of the housing. NOTICE: The seal must be pressed into place with a seal installing tool or suitable substitute.
  • Page 130 SECTION 58 - DRIVELINES - CHAPTER 3 58-36...
  • Page 131 SECTION 88 - - OPTIONAL EQUIPMENT - - CHAPTER 1 SECTION 88 - OPTIONAL EQUIPMENT Chapter 1 - Optional Equipment CONTENTS Section Description Page Left Swathboard Kit ............High Stubble Kit (3-1/2 inch to 5 inch) .

  • Page 132: Left Swathboard Kit

    SECTION 88 - - OPTIONAL EQUIPMENT - - CHAPTER 1 Optional parts can be ordered through your New Holland dealer. 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.

  • Page 133: High Stubble Kit (3-1/2 Inch To 5 Inch)

    SECTION 88 - - OPTIONAL EQUIPMENT - - CHAPTER 1 Bolt the support leg to the mount plate using 1/2 inch x 1-3/4 inch carriage bolts, lock washers, and nuts at 1. Assemble the swathboard by attaching the rubber flap to the left side of the swathboard using three 3/8 inch x 3/4 inch carriage bolts, 2, flat washers, and locknuts.
  • Page 134 1, are as close to (but not less than) 508 mm (20 in) from the ground on Model MD82 and MD92. On Model MD72, readjust the check chains so that the hitch pins, 1, are as close to (but not less than) 660 mm (26 in).

  • Page 135: Disc Knives

    SECTION 88 - - OPTIONAL EQUIPMENT - - CHAPTER 1 DISC KNIVES There are several disc mower knives available through Service Parts. Each type of knife is designed to function well in specific crop and field conditions. Contact your authorized dealer for the disc mower knife that will work best in your conditions.
  • Page 136 SECTION 88 - - OPTIONAL EQUIPMENT - - CHAPTER 1 88-6...

  • Page 137: Section 90 - - Decals

    SECTION 90 - - DECALS - - CHAPTER 1 SECTION 90 - - DECALS Chapter 1 - - Decals CONTENTS Section Description Page Safety Decals ..............90-1...
  • Page 138 SECTION 90 - - 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 in- with your machine operators. tended for your personal safety and for those working Keep the decals legible.
  • Page 139 SECTION 90 - - DECALS - - CHAPTER 1 Part #86624775 Part #86628571 Part #86520230 Part #86624301 Part #705923 90-3...
  • Page 140 SECTION 90 - - DECALS - - CHAPTER 1 Part #849471 Part #849472 Part #87041061 90-4...
  • Page 141 ..........Model MD72 .
  • Page 142 SECTION 00 - GENERAL INFORMATION Chapter 2 - Adjustments CONTENTS Section Description Page Opening Fields ............. Field Cutting .
  • Page 143 ............. . MD72 .
  • Page 144 SECTION 35 - - HYDRAULICS Chapter 1 - - Hydraulics CONTENTS Section Description Page Hydraulic Cylinders ............Disassembly .
  • Page 145 SECTION 58 - DRIVELINES Chapter 2 - Bevel Gearbox CONTENTS Section Description Page Bevel Gearbox ............. Removal .
  • Page 146 SECTION 88 - OPTIONAL EQUIPMENT Chapter 1 - Optional Equipment CONTENTS Section Description Page Left Swathboard Kit ............High Stubble Kit (3-1/2 inch to 5 inch) .

This manual is also suitable for:

Md82Md92