Part of the New Holland Repair Manuals.
One book settles what these balers actually require: the 422-page New Holland service manual covering the 630, 640, 650, and 660 round balers, the same New Holland 660 service manual PDF a dealer tech pulls when your net wrap quits mid-field. Wiring diagrams for the Bale Command electrical system back up a full troubleshooting section, and the twine and net wrapper chapters carry each wrapping cycle through adjustment, knife service, and repair. Apron belt failure analysis shows why a belt let go and how to relace it; the hydraulic section runs the tailgate lift and belt tension circuits through relief valve checks. Set pickup drive idler sag between 3/16 and 1/2 inch, then torque the cam bearing locknut to 83 ft. lbs. (113 N-m). A guessed slip clutch setting can cost you a gearbox, not an afternoon. Bookmarked and text-searchable, this PDF keeps the right figure in front of you while the windrow waits.
What's Inside This New Holland 630, 640, 650, 660 Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 3-20 | Precautionary Statements, Safety Decals, Basic Components, Hardware |
| PTO Driveline | 21-40 | Model 630 PTO, Models 640, 650, 660 PTO, Slide Collar Quick-Disconnect |
| Gearbox Removal | 41-60 | Removing the Gearbox, Rebuilding the Gearbox, Gearbox Installation |
| Standard and Wide Pickups | 61-84 | Standard Pickup, Wide Pickup |
| Slip Clutches | 85-108 | Main Drive Slip Clutch, Floor Roll Drive Clutch, Sledge Roll Drive Clutch |
| Floor Roll and Starter Roll Group | 109-128 | Floor Roll Removal, Starter Roll Model 630, Starter Roll Models 640, 650, 660 |
| Apron Roll Group | 129-164 | Releasing Belt Tension, Drive Roll Removal, Apron Drive Roll Declutch |
| Apron Belts | 165-188 | Belt Failure Analysis, Repairing Belt Lacing, Endless Belts |
| Sledge Roll Group | 189-236 | Follower Roll, Stripper Roll and Middle Roll, Pivot Roll and Sledge Assembly |
| Hydraulic System | 237-268 | Tailgate Lift System, Belt Tension System, Relief Valve |
| Twine Wrapper System - Model 630 | 269-276 | Adjustments, Drive Motor, Twine Arm Chain and Sprocket |
| Auto-Wrap Twine System - Models 640, 650, and 660 | 277-318 | Twine Wrapping Cycle, Twine Wrapper Adjustments, Twine Knives and Supports |
| Bale Command Mechanical System - Models 640, 650, and 660 | 319-378 | Twine Wrapping Cycle Operation, Twine Wrapper Adjustments, Net Wrapper |
| Bale Command Electrical System - Models 640, 650, and 660 | 379-422 | Components, Operation, Troubleshooting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Minimum tightening torque for 1/4 inch SAE Grade 2 unplated/plated silver bolt | 55 inch pounds (6.2 Newton-metres) | p. 15 |
| Minimum tightening torque for M4 Class 5.8 unplated bolt | 15 inch pounds (1.7 Newton-metres) | p. 16 |
| Guard cap screw torque | 102 in. lbs. (12 N-m) | p. 62 |
| Cam bearing locknut torque | 83 ft. lbs. (113 N-m) | p. 62 |
| Pickup drive idler sag | 3/16" - 1/2" (5 mm - 13 mm) | p. 69 |
| Auger drive chain deflection | 3/16" - 3/4" (5 mm - 20 mm) | p. 71 |
| Drive chain 4 deflection | 1/8 inch - 1/4 inch (3 mm - 5 mm) | p. 118 |
| Drive chain 5 spring length | 1-5/8 inch (41 mm) | p. 118 |
| Tailgate opening distance for belt stop | 36 in (90 cm) | p. 142 |
| Head bore wear limit | 0.005 in. (0.127 mm) | p. 242 |
| Eccentric to breakaway arm clearance | 1/64 inch to 1/32 inch (0.4 mm to 1.6 mm) | p. 291 |
| Knife actuating rod spring length | 2-1/2 inch (64 mm) | p. 295 |
New Holland 630, 640, 650, 660 Common Problems This Manual Covers
New Holland 650 twine arm will not return after tying, operator pulls tie arm back by hand
Check the twine arm path for bent feeder rods and binding pivots through a full hand-cycled wrap. Rotate the eccentric to set 1/64 to 1/32 inch (0.4 to 1.6 mm) clearance at the breakaway arm, page 291. On 650 and 660 Type I linkage, set strap overall length between 56-1/4 and 56-13/16 inches.
Manual Section: Auto-Wrap Twine System - Models 640, 650, and 660 p. 291Twine won't cut at the end of the wrap cycle, knives dull or arms stopping short
Inspect the twine knives for nicks and dull edges, replace any worn blades. Adjust the nuts on the knife actuating rods to compress the springs to a total length of 2-1/2 inches (64 mm), spec on page 321. If a spring must be squeezed below 2-1/8 inches (54 mm) for a clean cut, the knife is dull; replace it.
Manual Section: Bale Command Mechanical System - Models 640, 650, and 660 p. 321Pickup slips or chatters in heavy windrows, teeth stop turning under load
Test the pickup slip clutch; it should slip at 2800 in. lbs. (316 N-m), spec on page 64. Set drive chain free travel to 3/16 to 1/2 inch (5 to 13 mm) on the same page. Replace bent or broken pickup fingers and torque the new locknuts to 41 ft. lbs. (56 N-m), page 70.
Manual Section: Standard and Wide Pickups p. 64Tailgate drifts down or opens slowly, bale ejection takes longer every season
Test for cylinder leakage: raise the tailgate fully, shut off the tractor, and watch it for 15 minutes; more than 10 inches (254 mm) of drop means leaking lift cylinders or a worn lockout valve, page 243. Verify relief pressure reaches 2300 to 2400 PSI at the tailgate lift circuit, page 257, then repack or replace the failing cylinder.
Manual Section: Hydraulic System p. 243Apron belts fray along the edges or lacing pulls out halfway through a bale
Check the wear pattern against the belt failure analysis in the Apron Belts section starting on page 165: edge fraying points to belt misalignment, torn lacing points to worn fasteners or shock loads. Realign the belts, replace damaged lacing, and torque drive roll and follower roll hardware to 72 to 76 ft. lbs. (98 to 103 N-m), page 183.
Manual Section: Apron Belts p. 165Frequently Asked Questions
What are the torque specifications for M10 cap screws on the gearbox mounting?
The M10 cap screws used for mounting the gearbox should be tightened to a torque of 41 ft. lbs. (56 N-m). p. 38
What is the procedure for adjusting the twine knife tension on the Model 630?
To adjust the twine knife tension, compress the springs on the knife actuating rods to a total length of 2-1/2 inches (64 mm). Then, adjust the nuts so there is a gap of 1/8 inch (3.5 mm) between the washer and the tab. p. 60
What is the correct deflection for the auger drive chain on the wide pickup?
The auger drive chain on the wide pickup should be adjusted to have a deflection of 3/16 inch to 3/4 inch (5 mm to 20 mm). p. 71
What is the required torque for the sledge roll drive clutch cap screws?
The cap screws for the sledge roll drive clutch should be tightened evenly to a torque of 300 in. lbs. (4 N-m). p. 100
How do you adjust the tailgate sensor on the Bale Command system?
With the tailgate closed and latched, adjust the magnet to a clearance of 1/8 inch (3 mm) from the sensor. p. 383
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