Part of the New Holland Repair Manuals.
A baler that quits tying in the middle of a dry-hay window costs you more than twine. That is the failure this 1102-page New Holland BR740A repair manual PDF exists to prevent: factory publication 87606299, covering all four A-series round balers, BR740A through BR780A. Wiring diagrams trace the Bale Command Plus and Auto Wrap harnesses connector by connector, backed by component testing procedures that fill the better part of the electrical section, nearly a fifth of the book. Hydraulic schematics map the tailgate lift, belt tension, and pickup lift circuits, while overhaul coverage runs from the PTO driveline and gearbox through belts, rolls, and the sledge assembly. Set net wrapper brake pad clearance at 2 to 4 mm; pull wheel lug bolts to 156 N·m (115 ft.-lbs.). Guess, and you pay twice: the part, then the teardown. Bookmarked and keyword-searchable, this PDF is on your laptop in minutes, well before the weather turns.
What's Inside This New Holland BR740A, BR750A, BR770A, BR780A Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 1-84 | General Information Section |
| Implement Driveline | 85-210 | PTO Driveline, Gearbox, Clutches, Drives |
| Hydraulics | 211-274 | Tailgate Lift System, Belt Tension System, Feeding Pickup Lift Cylinder, Lubrication Greaselines and Oiler |
| Frame | 275-342 | Tailgate |
| Axles and Wheels | 343-348 | Axle, Adjustment, Tire Pressure, Wheel Torque, Wheel Bearings |
| Electrical Systems | 349-534 | Harness and Connectors, Components Operation Location and Testing, Bale Command Plus Electrical System, Auto Wrap Electrical System, Lights |
| Pickups | 535-756 | Standard Pickup, Wide Pickup with Stuffer 1.5 M, Wide Pickup with Stuffer 1.8 M and 2.1 M, Wide Pickup with Rotor 2.1 M, Delta Special Standard Pickup |
| Pressing | 757-970 | Take Up Arm, Belts, Starter Roll, Stationary Roll, Floor Roll, Belt Rolls, Sledge Assembly, Bale Slice Roll |
| Wrapping | 971-1084 | Net Wrapper Mechanical System, Twine Wrapper Mechanical System, Auto Wrap System |
| Ejection | 1085-1088 | Bale Ejector, Disassembly, Assembly |
| Shielding | 1089-1102 | Side Doors, Gas Spring, Latch, Door Stop, Door Hinge, Net and Twine Boxes |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Net wrapper brake pad | 2 to 4 mm (3/32 to 5/32") | p. 49 |
| Wide PU drive chain idler spring | 130 mm (5-1/8") | p. 49 |
| Wheel lug bolt torque | 156 N⋅m (115 ft.-lbs.) | p. 344 |
| Brake clearance | 2 to 4 mm | p. 443 |
| Pickup guard self tapping screw torque | 15 to 18 N·m | p. 541 |
| Cam follower bearing locknut torque | 61 N·m | p. 543 |
| Floor roll drive chain idler spring length | 192 mm | p. 539 |
| Belt length (Five foot diameter) | 8712 mm (343") | p. 772 |
| Belt length (Six foot diameter) | 10671 mm (420") | p. 772 |
| Wheel bolt torque (19/45-17) | 380 N⋅m | p. 51 |
| PTO on gearbox torque | 142 N⋅m | p. 51 |
| Sled slip clutch torque | 677 to 767 N⋅m | p. 51 |
New Holland BR740A, BR750A, BR770A, BR780A Common Problems This Manual Covers
New Holland BR740A net wrap roll will not turn, brake drags, wrap starts then tears
Check the brake to brake drum clearance on page 1016 and set it to 2 to 4 mm (1/16 to 3/16 inch). Measure the brake spring length; anything stretched past 119 to 123 mm is holding too much tension, so back it off. Spin the roll by hand and confirm it turns freely before reloading net.
Manual Section: Wrapping p. 1016Net and twine actuators will not drop after storage, monitor shows actuator error codes
Start with the actuator error codes on page 465: an Er 1 code means the net or twine actuator stalled for 5 seconds, an Er 3 the slicing knife actuator. Cycle each actuator manually and watch for binding in the linkage; corrosion after winter storage often seizes the pivots. Clean and free the pivots, then verify the knife spring measures 289 to 295 mm so the mechanism releases fully on command.
Manual Section: Bale Command Plus Electrical System Troubleshooting p. 465Baler stops feeding in heavy windrows, pickup turns but crop bridges at the chamber
Measure the pickup drive chain first: deflection should be 5 to 13 mm per page 163, and the idler spring should measure 130 mm (5-1/8 inch). Inspect sprockets for hooked teeth and replace worn chain and sprockets together. If the sled slip clutch chatters under load, verify it is set between 677 and 767 N·m.
Manual Section: Implement Driveline p. 163Bales are soft and misshapen, belts slip in the chamber, density will not build
Inspect belt condition and measure stretch: five foot chamber belts should run 8712 mm (343 inch), listed on page 772, and belts worn under the 178 mm (7 inch) width track poorly. Inspect the take up arm and tension components in the Pressing section starting on page 757, then replace stretched belts as a full set.
Manual Section: Pressing p. 772Pickup leaves strips of hay behind, broken tines rattle inside the pickup band
Remove the broken tines and inspect the tine bars for cracks around the mounting holes. Torque new center and end tine locknuts to 56 N·m (41 ft.-lbs.), listed on page 569, and pickup guard self tapping screws to 15 to 18 N·m. Spin the pickup by hand and confirm nothing drags before heading back to the field.
Manual Section: Pickups p. 569Frequently Asked Questions
How do I clear an error code on a New Holland BR750A?
To clear an error message and alarm, press the CLEAR key on the operator's panel. If the error persists, refer to the troubleshooting section for the specific error code, such as 'Er 1' for a stalled net or twine actuator, or 'Er 3' for a stalled slicing knife actuator. p. 484
What are the torque specifications for New Holland BR770A wheel bolts?
The wheel bolts for the BR770A (using 19/45-17 tires) should be torqued to 380 N⋅m (280 ft.-lbs.). For other tire configurations, such as the 11L-14 or 31-13.5x15, the torque specification is 156 N⋅m (115 ft.-lbs.). p. 344
What is the gearbox oil capacity for the New Holland round baler?
The gearbox oil capacity is 0.65 liters (22 oz.) using 80W-90 API GL5 gear lube. p. 110
What is the correct torque for the gearbox output driveshaft bolts on New Holland BR740A, BR750A, BR770A, BR780A balers?
The four M16 x 40 hex head screws attaching the gearbox to the mounting plate should be torqued to 240 N⋅m (177 ft. lbs.). p. 129
How do I adjust the tailgate lockout valve on a New Holland round baler?
To adjust the valve, loosen the two screws holding the valve to the bracket. Position the valve so that when the lower part of the handle touches the lower end of the bottom slot, the upper part of the handle clears the tab by less than 0.3 mm (1/64"). Tighten the mounting screws after adjustment. p. 220
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