Key Features & Specs
- 27-hp (20.1-kW)
- 54” and 60” 7Iron™ PRO decks
- Mow up to 10 mph
- Warranty: 36 months or 1200 hours, whichever comes first; First 24 months, no hour limitation**
- Features 12-gallon fuel tank, 24" foot platform
- Deck 7Iron™ PRO
- HP* 27-hp (20.1-kW)
- Deck Size 54" and 60"
- Fuel Options Gas
Specifications
Blades
| Thickness | 0.25 in. 0.64 cm |
| Blade tip speed | Approximately 18,000 fpm 5486 m/min |
| Number | Three |
Brakes
| Dynamic braking | Dual hand-controlled levers |
| Park brake actuation | Hand lever |
| Park brake | Internal wet disk |
Buyer's note
| Warranty | 36 months or 1200 hours, whichever comes first. First 24 months, no hour limitation. |
Dimensions
| Height | 48 in. 122 cm |
| Length | Foot platform up, 67.25 in. 171 cm Foot platform down, 72 in. 183 cm |
| Width | With chute down, 68, 74 in. 173, 188 cm |
| Weight | 1095 lb 497 kg (54 in.) 1120 lb 508 kg (60 in.) |
Drivetrain
| Travel speed | Speed range 0-10 mph 0-16.1 km/h Forward Infinite, 0-10 mph Infinite, 0-16.1 km/h Reverse Infinite, 0-5 mph Infinite, 0-8.0 km/h |
| Speed and direction control | Twin hand-controlled levers |
| Hydraulic pumps | 0.79 cu in. 13 cc |
| Wheel motors | 13 cu in. 213 cc |
| Filter | Two internal and replaceable |
| Hydraulic capacity | 6.0 U.S qt 5.7 L |
| Transmission | Tuff Torq TZT13 IHT |
| Hydraulic oil cooler | Two 8.5 in. (22 cm) fans |
Electrical system
| Cold cranking amp | 300 CCA |
| Battery voltage | 12 V |
| Charge system | At 3,600 rpm 20A |
| Operator presence starting system | Yes |
| Hour meter | Display panel including hour meter, fuel level, engine speed, system voltage, low engine oil pressure indicator, starting interlock indicators (PTO, operator presence, park brake), caution warning, stop warning, and on-board diagnostics |
Engine
| Oil filter | Full flow, replaceable |
| Cooling | Forced air, with integrated clean out ports and oil cooler |
| Manufacturer/Model | FX850V |
| Displacement | 52.0 cu in. 852 cc |
| Power | Gross at 3,600 rpm: 27 hp 20.1 kW |
| Air cleaner | Heavy-duty canister type with safety element |
| Cylinders | Two, V-twin |
| Lubrication | Full pressure |
| Crankcase capacity | With filter, 2.4 qt 2.3 L |
Fuel system
| Fuel tank switch/shut-off valve | No |
| Fuel type | Gasoline |
| Fuel tank capacity | 12 U.S. gal. 45.3 L |
Key Specs
| Blade tip speed | Approximately 18,000 fpm 5486 m/min |
| Mower deck size | 54-in. (137-cm) 7Iron™ PRO side-discharge 60-in. (152-cm) 7Iron™ PRO side-discharge |
| Fuel tank capacity | 12 U.S. gal. 45.3 L |
| Transmission | Tuff Torq TZT13 IHT |
| Engine Manufacturer/model | FX850V |
| Drive wheels | 22x12-12 pneumatic 22x11N12 Tweel |
| Warranty | 36 months or 1200 hours, whichever comes first. First 24 months, no hour limitation. |
| Speed range | 0-10 mph 0-16.1 km/h |
| Engine power | Gross at 3,600 rpm: 27 hp 20.1 kW |
| Caster wheels | 13x5-6 |
Mower decks
| Deck construction | 7-Iron™ PRO: one-piece forged steel |
| Discharge | Side |
| Size | 54-in. (137-cm) 7Iron™ PRO side-discharge 60-in. (152-cm) 7Iron™ PRO side-discharge |
| Height-of-cut range | Increments 0.25 in. 0.64 cm 1.5-5 in. 3.8-12.7 cm |
| Deck thickness | 7 gauge 0.180 in. 4.6 mm |
| Cutting width | 54-in. (137-cm) 7Iron™ PRO side-discharge 60-in. (152-cm) 7Iron™ PRO side-discharge |
PTO
| Type | Electro-magnetic with brake, 200 lb-ft 271 Nm |
| Drive | V-belt |
Tires
| Drive wheels | 22x12-12 pneumatic 22x11N12 Tweel |
| Load rating | 4 PR |
Wheels
| Caster wheels | 13x5-6 |
| Caster wheel type | Flat free |
| Front anti-scalp rollers | RH, center, LH |
Additional information
| Date collected | 28-Aug-2023 |
John Deere Q850M Image Gallery

