Your 2009 Bobcat 3FM84 finish mower weighs 860 lb. and spins three blades at 2030 RPM. When something goes wrong at those speeds, you need exact specs, not guesswork. This 74-page service manual (OEM #6987245) dedicates 33 pages to main frame repairs alone: caster wheel alignment, PTO driveline overhauls, gearbox rebuilds with exploded views, and blade spindle teardowns. Troubleshooting charts help you isolate vibration sources fast. Torque blade mounting hardware to 60 ft-lbs (85 N-m), set belt deflection to a max of 0.4 inches (10 mm), and shim gearbox backlash to 0.006 - 0.014 in. (0,15 - 0,36 mm). Hydraulic connection specs and fitting torques are included starting on page 65. Download this searchable, bookmarked PDF to your phone or tablet and work from it in the field.
What's Inside This Repair Manual
| System | Pages | Key Topics |
|---|
| Maintenance Safety | 3-4 | |
| Safety and Maintenance | 11-30 | Troubleshooting, Service Schedule, Inspection, Removal and Installation of Cutting Blades |
| Caster Wheel | 33-36 | Disassembly, Assembly, Cleaning, Removal and Installation |
| PTO Driveline | 37-40 | Driveline Guard, Locking Collar Installation, Disassembly, Assembly |
| Gearbox | 41-54 | Draining the Gear Lube, Disassembly, Assembly, Seal and Bearing Replacement |
| Blade Spindle | 55-60 | Disassembly, Assembly, Blade Removal, Bearing Service |
| Anti-Scalp Wheel | 61-62 | Removal and Installation, Wheel Height Setting |
| Support Arm Bushing | 63-64 | Removal and Installation, Bushing Replacement |
| Specifications and Schematics | 65-74 | Blade Size and Blade Speed, Ball Bearing Specifications, Hydraulic Connection Specifications, Torque Values |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| Torque for 0.500 inch SAE Grade 5 bolts | 65-70 ft-lb (88-95 N•m) | p. 69 |
| Service interval | Every 10 hours of operation | p. 15 |
| Blade mounting hardware torque | 60 ft-lbs (85 N-m) | p. 15 |
| Gearbox oil change interval | 50 hours | p. 15 |
| Belt tension (max deflection) | 0.4 in. (10 mm) | p. 22 |
| Gearbox pulley bolt torque | 125 - 140 ft.-lb. (170 - 190 N•m) | p. 42 |
| Gearbox shaft backlash | 0.006 - 0.014 in. (0,15 - 0,36 mm) | p. 45 |
| Mower Width (A) | 88.40 in. (2245,4 mm) | p. 67 |
| Mower Weight | 860 lb. (391 kg) | p. 67 |
| Number of Blades | 3 | p. 67 |
| Blade Speed | 2030 RPM | p. 67 |
| Cutting Height Range | 1.5 in. (38 mm) - 4.5 in. (114 mm) | p. 67 |
