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 |
New Holland 634, 644, 654, 664 Common Problems This Manual Covers
Apron belts mistracking or climbing
Uneven feeding or incorrect tension lets belts walk sideways, climb over each other, or flip. The Apron Belts section includes belt failure analysis, tracking adjustment, lacing repair, and installation of endless belts.
Manual Section: Apron Belts p. 169Slip clutches slipping under load
Worn or glazed friction discs let the main drive, floor roll, or sledge roll clutches slip in heavy crop, killing feeding and bale formation. The Slip Clutches section gives teardown, inspection, and the correct slip torque settings for each clutch.
Manual Section: Slip Clutches p. 87Bale Command monitor or sensor faults
A dead operator's panel, wrong bale size readings, or a full bale alarm that never trips are common on the 644, 654, and 664. The electrical section covers the operator's panel, controller, bale size sensor, and tailgate sensor.
Manual Section: Bale Command Plus Electrical System p. 377Twine knives not cutting cleanly
Worn or misadjusted twine knives leave strands trailing and stall the wrap cycle. This section covers twine knives and supports, twine tubes, and the clutch and brake assembly on the auto-wrap models.
Manual Section: Auto-Wrap Twine System - Models 644, 654 and 664 p. 277Broken or bent pickup fingers
Rocks and rough ground snap pickup fingers and wear out cam bearings, leaving strips of crop in the field. The pickup section covers finger replacement, cam bearing and cam track replacement, and pickup slip clutch repair.
Manual Section: Standard and Wide Pickups p. 63Tailgate will not lift or hold
Leaking cylinders, a faulty lockout valve, or low relief valve pressure keep the tailgate from opening or let it drift down. The Hydraulic System section covers the tailgate lift system, cylinder repair, lockout valve, and relief valve.
Manual Section: Hydraulic System p. 241Gearbox noise, leaks, or bearing wear
A whining or leaking gearbox usually means worn bearings or seals. This section covers gearbox removal, full rebuilds for both 540 RPM and 1000 RPM versions, and installation, including bearing preload setup.
Manual Section: Gearbox Removal p. 43Frequently Asked Questions
Which baler models does this manual cover?
It covers the New Holland 634, 644, 654, and 664 round balers in one 444-page repair manual, including the Model 634 twine wrapper and the Auto-Wrap and Bale Command systems on the 644, 654, and 664.
Does it include slip clutch settings?
Yes. The Slip Clutches section covers the main drive, floor roll drive, and sledge roll drive clutches with slip torque settings, spring scale checks, special tools, and a labor guide. p. 87
Does it cover the Bale Command electronics?
Yes. The Bale Command Plus Electrical System section covers the operator's panel, controller, bale size sensor, net wrapper actuator, tailgate sensor, and bale slice actuator on the 644, 654, and 664. p. 377
Can I fix belt tracking problems with this manual?
Yes. The Apron Belts section includes belt failure analysis, belt tracking adjustment, lacing repair, and installation of endless belts, so you can diagnose why belts mistrack and correct it. p. 169
Will this New Holland 634 Repair Manual download right away?
This is a 444-page PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Can I print specific sections of this New Holland 634 Repair Manual?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Can I trace hydraulic lines with this New Holland 634 manual?
Yes, complete hydraulic schematics with flow diagrams, valve configurations, and pressure specifications are included.
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