Part of the New Holland Repair Manuals.
Hay on the ground and the baler throwing loose bales is not the moment to hunt for answers. The New Holland BR740, BR750 service manual PDF (OEM 604.66.231.00) puts all 963 pages of factory repair data for both round balers in front of you: driveline and gearbox teardowns, brake service, tailgate and pickup lift hydraulics, and the full pressing and wrapping systems from belts to net wrapper. Wiring diagrams map the Bale Command Plus and Auto Wrap circuits down to individual harness connectors, while troubleshooting charts trace feeding and wrapping faults back to their cause. Set duckbill spring length to 384 to 390 mm, pickup flotation to 23 kg, and retire roller chains at 3 percent elongation, straight from the spec tables. When the twine wrapper quits at dusk, there is no one to call. Bookmarked and text-searchable, this PDF drops you on the wrapping section in three taps, not thirty minutes of page flipping.
What's Inside This New Holland BR740, BR750 Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 2-43 | Safety, Safety Decals, Torques and Adjustments, Technical Information |
| Implement Driveline | 44-135 | PTO Driveline, Gearbox, Clutches, Drives |
| Brakes | 136-193 | Brake Drum, Brake Shoes and Brake Cylinder, Parking Brakes, Hydraulic Brakes, Emergency Brakes, Pneumatic Brakes |
| Hydraulics | 194-253 | Tailgate Lift System, Belt Tension System, Pickup Lift, Rotor Knives and Reverse Cylinders, Lubrication - Greaselines and Oiler |
| Frame | 254-331 | Tailgate, High Hitch |
| Electrical Systems | 332-499 | Harness and Connectors, Components - Operation, Location, And Testing, Bale Command Plus Electrical System, Auto Wrap Electrical System, Lights |
| Product Feeding | 500-649 | Wide Pickup with Stuffer, Wide Pickup with Rotor |
| Pressing | 650-833 | Take Up Arm, Belts, Starter Roll, Stationary Roll, Belt Rolls, Sledge Assembly |
| Wrapping | 834-941 | Net Wrapper Mechanical System, Twine Wrapper Mechanical System, Auto Wrap System |
| Ejection | 942-945 | Bale Ejector |
| Shielding | 946-963 | Side Doors, Net and Twine Boxes |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Duckbill spring | 384 to 390 mm | p. 14 |
| Knife spring | 289 to 295 mm | p. 14 |
| Maximum allowable wear elongation for roller chains | 3% | p. 23 |
| Maximum allowable wear elongation for fixed center distance drives | 1.5% | p. 24 |
| Pickup flotation setting | 23 kg (50 lbs.) | p. 40 |
| Sledge Protection | 677 - 767 N·m (499 - 566 ft. lb.) | p. 35 |
| Endless Belts Length (BR750) | 10681 mm (420.5 inch) | p. 39 |
| Standard inside bore | 50.0 mm (2.00") | p. 199 |
| Bore wear limit | 0.127 mm (0.005") | p. 199 |
| Net actuator circuit voltage | 12 volts (plus or minus 0.5 volts) | p. 450 |
| Twine actuator circuit voltage | 12 volts (plus or minus 0.5 volts) | p. 452 |
| Floor roll shaft bolt torque | 98 N⋅m (72 ft.-lbs.) | p. 506 |
New Holland BR740, BR750 Common Problems This Manual Covers
New Holland BR750 bales suddenly soft, density pressure gauge reads zero even with tailgate raised
Check the tailgate cylinders for internal leakage using the hydraulic troubleshooting procedures. Blown piston seals bleed density pressure straight back to tank. Pull each cylinder and measure the bore against the 50.0 mm (2.00 inch) standard on page 199; anything past the 0.127 mm wear limit means a new barrel, not just seals.
Manual Section: Tailgate Cylinders Troubleshooting p. 199Net and twine actuators will not drop, monitor keeps showing actuator error codes
Test for 12 volts (plus or minus 0.5 volts) at the net actuator circuit on page 450 and the twine actuator circuit on page 452 while the panel commands a wrap cycle. No voltage points to the harness or controller; full voltage with no movement means the actuator itself is seized and needs replacement.
Manual Section: Bale Command Plus Electrical Troubleshooting p. 450Wrap alarm sounds after every bale even though the net cuts and wraps fine
Measure the duckbill spring at 384 to 390 mm free length and set brake pad clearance to 2 to 4 mm, both on page 843. Check the knife spring for 289 to 295 mm per page 418. A weak spring or dragging brake stops the duckbill short of home, so the monitor never sees a finished cycle.
Manual Section: Wrapping p. 843Pickup drive chain jumps sprockets or pickup plugs up in heavy wet windrows
Check chain elongation first; replace any roller chain stretched past 3 percent, the wear limit on page 24. Adjust the idler for 6 mm (1/4 inch) deflection per page 514, then inspect sprockets for hooked teeth. In heavy wet windrows, slow ground speed and rake wider, flatter rows so the pickup can keep up.
Manual Section: Product Feeding p. 514Belt tension pressure will not reach working range, bales stack loose and barrel shaped
Set bale density pressure by crop rather than to a single figure: page 213 lists 110 to 152 bar (1600 to 2200 PSI) for alfalfa, 110 to 172 bar (1600 to 2500 PSI) for grass hay, 83 to 138 bar (1200 to 2000 PSI) for straw and 62 to 97 bar (900 to 1600 PSI) for silage, the same figures on BR740 and BR750. Read the gauge with the tailgate raised all the way up, then adjust with the knob at the right rear of the baler. If the pressure will not hold, inspect the tension circuit for external leaks at hoses and fittings and check the take-up arm cylinder for internal bypass. These balers use a single-cylinder density system (page 209). Low pressure here makes soft, barrel-shaped bales no matter how the windrow feeds.
Manual Section: Hydraulics p. 213Frequently Asked Questions
What are the torque specifications for the wheel bolts on the BR740 and BR750 balers?
For the 19/45-17 tires, the wheel nuts should be torqued to 380 N⋅m (280 ft.-lbs.). For the 31-13.5x15 tires, the wheel bolts should be torqued to 156 N⋅m (115 ft.-lbs.). p. 15
What is the procedure for setting the twine knife tension on the BR740 and BR750 balers?
With the twine tubes in the home position, loosen the upper nuts and tighten the lower nuts until the total length of the two springs is 64 mm (2-1/2 inches). Then, adjust the two lower nuts until there is a 3 mm (1/8 inch) gap between the washers and the plate weld assembly on each rod. p. 890
What is the required oil capacity for the gearbox?
The gearbox requires 0.65 liters (22 oz.) of 80W-90 API GL5 gear lube. p. 67
How do you adjust the belt tension spring length on the BR740 and BR750 balers?
The belt tension spring should be adjusted to a length of 375 mm (14-3/4 inches) inside the hooks. p. 750
What is the correct clearance for the net wrapper brake pad?
The net wrapper brake pad should have a clearance of 2 to 4 mm (3/32 to 5/32 inches). p. 15
What format is this New Holland BR740 manual in?
Immediate download of the complete 963-page searchable Service Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Is this New Holland BR740 manual print-friendly?
Yes. The PDF is DRM-free, so printing works from any reader and any printer.
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