844
- Operating Weight
- 165089 lb / 74883 kg
- Net Power - SAE J1349:2011 - Standard Ambient
- 732 hp / 546 kW
- Rated Speed
- 1800 r/min
Maximize productivity in mining applications with the Cat® 844 Wheel Dozer, designed with efficiency in mind. Enhanced maintenance capabilities and simplified serviceability make for a long lifecycle, low owning and operating costs, and more uptime. Move more material with a machine built for the toughest conditions.
| Engine | |
|---|---|
| Engine Model | Cat® C27 |
| Net Power - SAE J1349:2011 - Standard Ambient | 732 hp / 546 kW |
| Rated Speed | 1800 r/min |
| Emissions | Option 1 - U.S. EPA Tier 4 Final / EU Stage V |
| Engine Power - ISO 14396:2002 | 786 hp / 586 kW |
| Gross Power - SAE J1995:2014 | 801 hp / 597 kW |
| Net Power - SAE J1349:2011 - High Ambient | 681 hp / 508 kW |
| Emissions | Option 2 - China Nonroad Stage III emissions standards, equivalent to U.S. EPA Tier 2 |
| Engine Power - ISO 14396: 2002 | 752 hp / 561 kW |
| Gross Power - SAE J1995:2014 | 766 hp / 571 kW |
| Net Power - SAE J1349:2011 - Standard Ambient | 699 hp / 521 kW |
| Net Power - SAE J1349:2011 - High Ambient | 648 hp / 483 kW |
| Bore | 5.4 in / 137.2 mm |
| Stroke | 6 in / 152.4 mm |
| Displacement | 1649.5 in³ / 27.03 l |
| Peak Torque - Speed | 2624 lb/ft / 3557 N·m |
| Torque Rise | 18 % |
| Note | Net power advertised is the power available at the flywheel when the engine is equipped with fan at minimum speed, air intake system, exhaust system, and alternator. |
| Operating Specifications | |
|---|---|
| Operating Weight | 165089 lb / 74883 kg |
| Blade Capacity Range | 20.8 yd³ / 15.9 m³ |
| Transmission | |
|---|---|
| Transmission Type | Cat Planetary Power Shift |
| Converter Drive - Forward 1 | 4.5 mile/h / 7.3 km/h |
| Converter Drive - Forward 2 | 8.3 mile/h / 13.3 km/h |
| Converter Drive - Forward 3 | 14.2 mile/h / 22.9 km/h |
| Converter Drive - Reverse 1 | 4.9 mile/h / 7.9 km/h |
| Converter Drive - Reverse 2 | 9.1 mile/h / 14.7 km/h |
| Converter Drive - Reverse 3 | 15.5 mile/h / 24.9 km/h |
| Direct Drive - Forward 1 | Lock-up disabled |
| Direct Drive - Forward 2 | 8.5 mile/h / 13.7 km/h |
| Direct Drive - Forward 3 | 15.2 mile/h / 24.5 km/h |
| Direct Drive - Reverse 1 | 5.4 mile/h / 8.7 km/h |
| Direct Drive - Reverse 2 | 9.6 mile/h / 15.4 km/h |
| Direct Drive - Reverse 3 | 16.4 mile/h / 26.4 km/h |
| Note | Travel speeds based on 45/65-45 L-5 46 ply tires. |
| Hydraulic System - Lift/Tilt | |
|---|---|
| Output at 2,000 rpm and 6900 kPa (1,000 psi) | 82 gal/min / 311 l/min |
| Cylinders, Double Acting - Lift, Bore and Stroke | 133 mm × 1535 mm (5.25 in × 60.4 in) |
| Cylinder, Double Acting - Tilt and Tip, Bore and Stroke | 210 mm × 188 mm (8.25 in × 7.4 in) |
| Relief Valve Setting - Bulldozer (Large Pump) | 2700 psi / 18650 kPa |
| Relief Valve Setting - Tilt Cylinders (Small Pump) | 2920 psi / 20150 kPa |
| Hydraulic System - Steering | |
|---|---|
| Steering System - Circuit | Pilot, load sensing |
| Steering System - Pump | Piston, variable displacement |
| Minimum Turning Radius - Over Blade | 34 ft / 10369 mm |
| Total Steering Angle | 35 ° |
| Maximum Flow | 94.3 gal/min / 357 l/min |
| Relief Valve Setting | 4500 psi / 31000 kPa |
| Service Refill Capacities | |
|---|---|
| Fuel Tank - Standard | 286.6 gal (US) / 1085 l |
| Cooling System | 54.9 gal (US) / 208 l |
| Crankcase | 20 gal (US) / 76 l |
| Transmission | 29.1 gal (US) / 110 l |
| Differential - Final Drives - Front | 71.6 gal (US) / 271 l |
| Differential - Final Drives - Rear | 68.9 gal (US) / 261 l |
| Hydraulic System - Implement and Hydraulic Fan | 68.9 gal (US) / 261 l |
| Hydraulic System - Steering and Braking | 34.9 gal (US) / 132 l |
| Air Conditioning System | |
|---|---|
| Air Conditioning | The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a or R1234yf. See the label or instruction manual for identification of the gas. - If equipped with R134a (Global Warming Potential = 1430), the system contains 1.8 kg (3.9 lb) of refrigerant, which has a CO2 equivalent of 2.574 metric tonnes (2.837 tons). |
| Axles | |
|---|---|
| Front | Fixed |
| Rear | Trunnion |
| Oscillation Angle | 8.5 ° |
| Brakes | |
|---|---|
| Brakes | Meets ISO 3540:2011 |
| Sound Performance - Tier 4 Final / Stage V | |
|---|---|
| Operator Sound Pressure Level (ISO 6396:2008) | 72 dB(A) |
| Machine Sound Power Level (ISO 6395:2008) | 116 dB(A) |
| Operator Sound Pressure Level (ISO 6396:2008)* | 72 dB(A) |
| Machine Sound Power Level (ISO 6395:2008)* | 114 dB(A) |
| Note (1) | *Sound suppression equipped |
| Note (2) | The machine sound power level was measured according to ISO 6395:2008. The measurement was conducted at 70 percent of the maximum engine cooling fan speed. |
| Note (3) | The operator sound pressure level was measured according to ISO 6396:2008. The measurement was conducted at 70 percent of the maximum engine cooling fan speed. |
| Note (4) | Hearing protection may be needed when the machine is operated with a cab that is not properly maintained or when the doors or windows are open for extended periods or in a noisy environment. |
| Sound Performance - Tier 2 | |
|---|---|
| Operator Sound Pressure Level (ISO 6396:2008) | 72 dB(A) |
| Machine Sound Power Level (ISO 6395:2008) | 116 dB(A) |
| Operator Sound Pressure Level (ISO 6396:2008)* | 72 dB(A) |
| Machine Sound Power Level (ISO 6395:2008)* | 114 dB(A) |
| Note (1) | *Sound suppression equipped |
| Note (2) | The machine sound power level was measured according to ISO 6395:2008. The measurement was conducted at 70 percent of the maximum engine cooling fan speed. |
| Note (3) | The operator sound pressure level was measured according to ISO 6396:2008. The measurement was conducted at 70 percent of the maximum engine cooling fan speed. |
| Note (4) | Hearing protection may be needed when the machine is operated with a cab that is not properly maintained or when the doors or windows are open for extended periods or in a noisy environment. |
| Cab | |
|---|---|
| ROPS/FOPS | ISO 3471:2008 and ISO 3449:2005 Level II Standards |
| Dimensions (Approximate) | |
|---|---|
| Height - Top of ROPS | 17.2 ft / 5240 mm |
| Height - Top of Exhaust Pipe | 16.6 ft / 5049 mm |
| Height - Top of Hood | 12.7 ft / 3862 mm |
| Ground Clearance | 2 ft / 596 mm |
| Centerline of Front Axle to Hitch | 7.5 ft / 2300 mm |
| Centerline of Rear Axle to Edge of Bumper | 12.5 ft / 3795 mm |
| Wheel Base | 15.1 ft / 4600 mm |
| Length - With Blade on Ground | 36.5 ft / 11120 mm |