Part of the New Holland Repair Manuals.
This is the New Holland repair manual for the 634, 644, 654, and 664 round balers, publication 40063440, delivered as a 444-page PDF download. It is the factory service reference covering every major system on these balers: PTO driveline, gearbox, standard and wide pickups, slip clutches, floor and starter rolls, apron rolls and belts, sledge rolls, hydraulics, and the twine and net wrap systems, including the Bale Command Plus electronics used on the 644, 654, and 664.
The procedures walk through removal, disassembly, inspection, and reassembly with the specifications you need to do the job right, such as slip clutch settings, bearing preloads, and fastener torques. Several sections also include labor guides for estimating repair time.
If you are rebuilding a gearbox, replacing pickup fingers, tracking apron belts, or chasing a Bale Command fault, this manual gives you the factory procedure for it.
What's Inside This New Holland 634, 644, 654, 664 Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 3-22 | Precautionary Statements, Safety Decals, Basic Components, Driveline Components, Hardware, Conversion Chart |
| PTO Driveline | 23-42 | PTO Removal, Front PTO Shaft Disassembly, Rear PTO Shaft Disassembly, Inspection, PTO Assembly, Slide Collar Quick-Disconnect |
| Gearbox Removal | 43-62 | Gearbox Rebuild 540 RPM, Gearbox Rebuild 1000 RPM, Gearbox Installation, Labor Guide |
| Standard and Wide Pickups | 63-86 | Standard Pickup Finger Replacement, Cam Bearing Replacement, Slip Clutch Repair, Pickup Removal, Cam Track Replacement, Wide Pickup Auger Repair |
| Slip Clutches | 87-108 | Main Drive Slip Clutch, Floor Roll Drive Clutch, Sledge Roll Drive Clutch, Special Tools, Labor Guide |
| Floor Roll and Starter Roll Group | 109-132 | Floor Roll Removal, Floor Roll Assembly, Starter Roll Removal, Starter Roll Installation, Bale Slice Knife Carriage & Roll Assembly, Labor Guide |
| Apron Roll Group | 133-168 | Releasing Belt Tension, Drive Roll Removal, Apron Drive Roll Declutch, Idler Rolls, Labor Guide |
| Apron Belts | 169-192 | Belt Failure Analysis, Repairing Belt Lacing, Belt Tracking, Installation of Endless Belts, Labor Guide |
| Sledge Roll Group | 193-240 | Follower Roll, Stripper Roll, Middle Roll, Sledge or Pivot Arm, Pivot Roll |
| Hydraulic System | 241-268 | Tailgate Lift System, Cylinder Repair, Lockout Valve, Belt Tension System, Density System, Relief Valve |
| Twine Wrapper System - Model 634 | 269-276 | Drive Motor, Twine Arm/Drive, Electrical Control Box, Full Bale Alarm Switch |
| Auto-Wrap Twine System - Models 644, 654 and 664 | 277-316 | Twine Tubes, Twine Knives and Supports, Clutch and Brake Assembly, Cam, Cam Follower, And Worm Gears, Trip Slide, Full Bale Alarm |
| Section - 13 Bale Command Mechanical System - Model 644, 654 and 664 | 317-376 | Twine Knives, Twine Tubes, Net Wrapper Actuator, Net Wrapper Duckbill, Net Wrapper Brake, Net Wrapper Knife |
| Bale Command Plus Electrical System | 377-444 | Operator's Panel, Controller, Bale Size Sensor, Net Wrapper Actuator, Tailgate Sensor, Bale Slice Actuator |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Slip clutches | SECTION 5 | p. 2 |
| PTO driveline slip clutch torque | 40 ft. lbs. - 45 ft. lbs. (54 N·m - 61 N·m) | p. 92 |
| Endless belts temporary repair section length | 6' (1828 mm) | p. 2 |
| clearance between eccentric and breakaway arm | 1/64" to 1/32" (0.4 mm to 1.6 mm) | p. 291 |
| clearance between breakaway and top of bracket | up to 0.030" (8 mm) | p. 292 |
| Belt tension spring | Remove the belt tension spring, 9. | p. 307 |
| Alarm switch roller centering | Shim the alarm switch, 32, so its roller is centered on the cam. | p. 303 |
| Full bale alarm duration | approximately 3 seconds | p. 312 |
| Twine tubes gap (when in "twine start" position) | 2" - 3" (51 mm - 76 mm) | p. 2 |
| 654 | ||
| Belt tension, releasing | 2" - 3" (50 mm - 75 mm) free length | p. 163 |
| 654, 664 | ||
| Belt shortening limit before bale size is noticeably affected | 3" to 4" | p. 2 |
