When the twine wrapper on an 846 stops cycling with two fields of hay still down, there is no dealer counter to lean on, just you, the baler, and the weather report. This service manual covers the Sperry New Holland 846 and 847 round balers and walks through the repairs that get one turning again: the telescoping PTO drive and gearbox, pickup finger replacement, apron and floor chains, the twine wrapper clutch and worm gear, and the tailgate hydraulic cylinders.
Across its 58 pages you get factory disassembly and reassembly procedures with the numbers that matter, such as 45 to 55 ft. lbs. on the PTO input shaft set screws and hand-check deflection specs for the chains, plus a full specifications section.
It arrives as a PDF download the moment you order, prints clean for the shop bench, and it is bought once and yours to keep for this machine.
What's Inside This Sperry New Holland 846, 847 Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 5 | Hardware Key, Tightening Torques |
| Safety | 6-7 | Personal Safety Precautions, Machine Safety Shields, Hydraulic Cylinder Lock-Outs, Bale Handling Safety |
| Drive System | 9-25 | Telescoping PTO Drive, Gearbox Input Drive Shaft, Gearbox, Floor Chain Drive Chain Adjustment (846 and 847) |
| Pickup Assembly | 26-28 | Pickup Finger Replacement, Cam Followers, Tooth Pipe Assembly, Pickup Removal, Pickup Adjustment |
| Apron Chain | 29-36 | Upper Idler Sprockets, Lower Take-Up-Arm Idlers |
| Floor Chains and Drive | 37-41 | Floor Chain Replacement, Floor Guide Channel and Floor Replacement, Floor Chain Drive Shaft Replacement |
| Automatic Twine Wrapper | 42-50 | Clutch and Worm Gear, Adjustments, Twine Tube Support |
| Hydraulic Cylinder | 51-53 | General Procedures, Tailgate Cylinders, Disassembly, Inspection, Assembly |
| Specifications | 54-55 | Overall Dimensions, Weight, Tractor Requirements, Bale Specifications, Drive Systems |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| PTO yoke set screws torque | 45 to 55 ft. lbs. (61 to 75 N·m) | p. 14 |
| Floor chain adjustment deflection | 3/16" to 3/8" (5-10 mm) | p. 37 |
| Model 846 floor chain drive chain deflection | 1" (25 mm) | p. 23 |
| Model 847 floor chain drive chain tension spring length | 11 1/2" (292 mm) | p. 23 |
| Pickup weight when lifted at wind guard cross tube | 30 lbs. (133 N) | p. 28 |
| Bale Weight | 450-850 lbs | p. 54 |
| Flotation Pick-up Tire Pressure | 15 psi | p. 55 |
| 846 | ||
| Model 846 Apron Chain Hardware Torque | 18-24 ft-lbs | p. 35 |
| 847 | ||
| Model 847 Apron Chain Hardware Torque | 31-37 ft-lbs | p. 35 |
