Cat Dozers 844 | Mining

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Specifications

Air Conditioning System

Air Conditioning

The air conditioning system on this machine contains the fluorinated greenhouse gas refrigerant R134a (Global Warming Potential = 1430). The system contains 1.8 kg of refrigerant which has a CO2 equivalent of 2.574 metric tonnes.

Axles

Front

Fixed
Rear

Trunnion
Oscillation Angle

8.5 ° 8.5 °

Brakes

Brakes

Meets ISO 3540:2011

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

Engine

Engine Model

C27 Cat®
Rated Speed

1800 r/min 1800 r/min
Gross Power - ISO 14396

752 hp 561 kW
Gross Power - SAE J1995:2014

766 hp 571 kW
Net Power - SAE J1349 - Standard Ambient

699 hp 521 kW
Net Power - SAE J1349 - 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 % 18 %
Emissions

U.S. EPA Tier 4 Final and EU Stage V or China Nonroad Stage III Emissions standards, equivalent to U.S. EPA Tier 2

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 ° 35 °
Maximum Flow

94.3 gal/min 357 l/min
Relief Valve Setting

4500 psi 31000 kPa

Operating Specifications

Operating Weight

165089 lb 74883 kg
Blade Capacities

15.9 - 30.7 m3 (20.7 - 40.2 yd3)

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

Sound Performance - Standard

Operator Sound Level (ISO 6396:2008)

69 dB(A) 69 dB(A)
Machine Sound Level (ISO 6395:2008)

115 dB(A) 115 dB(A)

Sound Performance - Suppression

Operator Sound Level (ISO 6396:2008)

69 dB(A) 69 dB(A)
Machine Sound Level (ISO 6395:2008)

113 dB(A) 113 dB(A)

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

Benefits

Unmatched Durability

The full box-section rear frame resists torsional shock and twisting forces.
Solid through-width push beams transfer and absorb stresses through a larger portion of the frame.
Robust structures withstand the toughest conditions and multiple lifecycles to improve your bottom line.
Resilient, durable blades are designed with excellent dozing and rolling characteristics.
Optimized axle mounting results in increased structural integrity.
Castings in the engine and frame are used in high stress areas to spread high loads.
One-piece castings enhance strength in key pin areas.

Optimum Efficiency

Experience reliable efficiency with complete control over injection timing, duration, and pressure with Mechanically Actuated Electronic Unit Injection (MEUI™).
Best-in-class Cat planetary powershift transmission features consistent, smooth shifting and efficiency through integrated electronic controls.
Extended engine life and improved fuel efficiency with reduced rated speed.
Impeller Clutch Torque Converter (ICTC) and Rimpull Control System (RCS) provide precise rimpull control.
Load sensing hydraulic steering system enables precise machine control for easier loading.
Lock-up torque converter with advanced control of lock-up speed.
On demand cooling fan protects investment and lengthens lifecycle.

Increased Safety

Battery disconnect, emergency engine shutdown, and stairway light switch are accessed through the ground level power service center.
Optional Cat Detect with Object Detection System (rearview camera and radar) or Vision (rearview camera) increase operator awareness around the machine.
Cab-mounted LED strobes provide warning for others near the machine.
Wider stairs with reduced stair angles increase safety for operators.
Access stairs via a powered platform from cab or ground level and have emergency egress access.

Innovative Technology

Integrated technologies allow you to monitor, manage, and enhance your jobsite operations.
Product Link™ remote monitoring provides valuable insight into machine or fleet performance through the VisionLink® interface, so you can make decisions that boost jobsite efficiency and lower operating costs.
Vital Information Management System (VIMS™) 3G touchscreen monitor gives access to a wide range of sensor information and enhanced machine data to resolve problems before machine failure.
Optional Cat Detect technologies enhance awareness of the environment around the machine for increased safety.

Enhanced Operator Comfort

Steering and Transmission Integrated Control System (STIC™) combines directional selection, gear selection, and steering into a single lever, maximizing responsiveness and control while reducing operator fatigue.
Operators can easily enter and exit the cab with fold-up STIC steer/armrest, reduced access stairway angles, and standard stairway lighting.
Experience reduced vibrations with isolated cab mounts and seat-mounted implement and steering controls.
Reduced interior sound levels keep operators comfortable throughout their entire shift.

Improved Sustainability

Meets U.S. EPA Tier 4 Final emissions standards.
Emits up to 18% less Co2 /hr.*
Automatic Engine Idle Shutdown conserves fuel when machine is not in use.
Generate less waste with maintenance-free batteries.
Maximize machine life and lower operating costs with Caterpillar Reman and Certified Rebuild programs, which utilize reused or remanufactured components for 40 to 70 percent cost savings.
Retrofit packages from Caterpillar deliver new features to older machines to get the most from your investment.

Simplified Maintenance

Swing-out fuel, hydraulic oil coolers, and condenser allow for easy access cleanout.
Machine features ground level or platform access to easily reach daily service points.
Swing-out doors on either side of the engine compartment provide easy access to critical daily service checks.
Optional tire pressure monitoring system provides real-time information to the operator in the cab for optimized tire life.
Electronics bay is conveniently located inside the cab.
Sight gauges offer quick visual inspection to minimize fluid contamination.
Lighting inside the engine compartment improves visibility to service points.
Ecology drains prevent spills and allow for easier service.
500-hour engine oil and filter change interval with S•O•S oil sampling analysis.
Service center includes drain and fill, electronic technician connection, and fluid level status.
Axle oil cooler and Automatic Retarder Control prevents unnecessary wear from accelerating down declines.

Built for Your Operation

Dependable blades are designed for mining with press rib construction and optimized widths and capacities for excellent dozing and rolling.
Available Cat coal blades retain load control and a large capacity for lighter materials.
Semi-U Blade features the increased capacity and spreading capabilities of a straight blade.
Heavy-Duty Semi-U blade includes a Hardox 400 Liner plate, side plates, and additional reinforcements at the bottom of the blade.
Equipped with the Cat MineStar System, a suite of integrated mine operations and mobile equipment technologies.
Cat MineStar’s capabilities help manage all aspects of operation.
Fleet provides remote machine tracking capabilities.
Terrain for Loading enables high precision management of load management.
Detect assists the operator with areas of limited visibility.
Health delivers machine condition and operating data and diagnostic tools for longer machine lifecycle.