Part of the John Deere Repair Manuals.
Working on a John Deere 646B? This 55-page JD646-B Technical Manual PDF (OEM TM-1116) walks you through predelivery, delivery, and after-sale service on the compactor, from fuel system bleeding to lubrication points. Inside: factory safety procedures, full machine specifications (engine power, hydraulic system, dimensions, capacities), and a maintenance section covering storage prep, pre-cleaner service, and gauge operation. You also get torque tables straight from Deere engineering. Set the wheel retaining cap screws to 450 lb-ft, tighten the transmission and steering oil filter covers to 55 lb-ft, and run tire pressure at 70 psi. Change engine oil every 200 hours, not when the forum says so. Your compactor doesn't care about guesses; it cares about numbers. Bookmarked PDF opens on any device, so bring the tablet to the machine and get wrenching.
What's Inside This John Deere 646B, JD646-B Manual
| System | Pages | Key Topics |
|---|---|---|
| General Information | 1 | Contents, Introduction and Safety Information, Predelivery, Delivery and After-Sale Services, Lubrication |
| Wheels | 2 | Powered Wheels, Tires and Fastenings, Specifications and Special Tools |
| Operator's Station | 3-6 | Safety Equipment, Comfort and Convenience Items, Operator Enclosure, Seat, Instruments and Indicators, External Engine Speed Controls, Heater, Specifications and Special Tools |
| General Information: Contents and Page Listing | 7-8 | Manual Contents, Page Revision Dates, Index |
| Group II: Introduction and Safety Information | 9-16 | Safety Alert Symbols, Fire Hazards, Maintenance Precautions, Operating Safety, Accident Prevention |
| Group III: General Specifications | 17-20 | Engine Power, Hydraulic Systems, Steering, Dimensions, Capacities, Standard Equipment |
| Group IV, Predelivery Service | 21-35 | Temporary Storage, Pre-Cleaner, Battery Electrolyte, Coolant and Fuel Levels, Crankcase Oil, Hydraulic Pressure Release |
| Group IV, Delivery Service | 36-50 | Engine Crankcase Oil and Filter, Accelerator Pedal and Idle Adjustment, Upper Pivot Pin Stop Nut, Wheel Retaining Cap Screws, Accumulator Action, Electric Fuel Transfer Pump Screen, Accessible Hardware Torque Values |
| Group IV, Delivery and After-Sale Services | 51-54 | Lubrication Points, Compactor Control Lever, Tire Pressure, Change Filters, Check Electrical System, Charging System, Check Hydraulic System, Fluid Leakage, Check Torque |
| Appendix: Promotional Material | 55-55 | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Transmission and steering oil filter cover torque | 55 lb-ft (7.6 kg-m) | p. 29 |
| Tire Pressure | 70 psi | p. 32 |
| Upper Pivot Pin Stop Nut Torque | 1000 lb-ft | p. 45 |
| Wheel Retaining Cap Screws Torque | 450 lb-ft | p. 45 |
| Engine Oil Change Interval | 200 hours | p. 36 |
| Transmission/Steering Filter Cover Torque | 55 lb-ft | p. 38 |
| Slow Idle Speed | 700 rpm | p. 44 |
| No-load Fast Idle Speed | 2400 rpm | p. 44 |
John Deere 646B, JD646-B Common Problems This Manual Covers
John Deere 646B hydraulics weak and erratic, steering response sluggish after fluid and filter change
Check transmission and steering oil level first; low fluid pulls air into the system and makes every function erratic. Replace both filter elements, packings, and O-rings, then torque the filter covers to 55 lb-ft (7.6 kg-m) as specified on page 38. Cycle the steering lock to lock several times to purge trapped air.
Manual Section: Group IV: Predelivery, Delivery, and After-Sale Services p. 38Battery will not charge and starter cranks slowly, terminals corroded and alternator belt loose
Clean and tighten both battery terminals before condemning any parts; most slow-crank complaints start right there. Inspect the alternator belt for glazing and proper tension, then check the circuit breakers and fuses. With the engine at no-load fast idle of 2400 rpm, set per page 44, confirm charging output at the ammeter.
Manual Section: Electrical SystemEngine surges at idle and will not reach rated speed under load
Verify slow idle at 700 rpm and no-load fast idle at 2400 rpm using the adjustment procedure on page 44, then work the speed control linkage through full travel and feel for binding or worn pivots. Replace a plugged fuel filter and bleed the system before you blame the injection pump.
Manual Section: Engine Speeds p. 44Machine pulls to one side with uneven ride and rapid drive tire wear
Check cold tire pressure and adjust all tires to 70 psi (4.9 kg/cm2) per page 32; a soft tire on one side drags the machine toward it. Check wheel retaining cap screw torque at 450 lb-ft (62.2 kg-m), covered on page 45, and inspect the fastenings for elongated bolt holes.
Manual Section: Wheels p. 32Low oil pressure at operating temperature, gauge needle drops toward zero at idle
Check the oil level on level ground before anything else, then review service history. Drain and refill with fresh oil and a new filter if the machine is past its interval: first change at 100 hours, every 200 hours after that, per page 36. If pressure stays low with fresh oil, suspect the regulating valve or worn bearings.
Manual Section: Group IV: Predelivery, Delivery, and After-Sale Services p. 36Frequently Asked Questions
What are the torque specifications for the wheel retaining cap screws on the John Deere 646B?
The wheel retaining cap screws for both Cepeco and Caron wheels must be tightened to a torque of 450 lb-ft (62.2 kg/m). p. 34
What is the recommended engine oil change interval for the John Deere 646B?
The engine oil should be changed after the first 100 hours of operation, and then every 200 hours thereafter. p. 36
What is the correct tire pressure for the John Deere 646B?
All tires on the compactor must be inflated to the same pressure, which is 70 psi (4.9 kg/cm²). p. 32
How do I adjust the alternator belt tension on the John Deere 646B?
When using a strand tension gauge, the initial reading should be 130 to 140 pounds (579 to 623 N). After 3 minutes of operation, recheck the tension; it should read a minimum of 85 to 95 pounds (378 to 423 N). p. 25
What is the fuel tank capacity of the John Deere 646B?
The fuel tank capacity for the John Deere 646B is 56 U.S. gallons (211.9 liters). p. 23
What format is this John Deere 646B manual in?
Straight to your device: 55 pages of scanned Technical Manual, downloadable the moment payment goes through.
Can I print this John Deere 646B manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
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