844 Wheel Dozer

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Description

Technical Specifications

Benefits and Features

Equipment

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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
Rated Speed	1800 r/min
Emissions	Option 1 - U.S. EPA Tier 4 Final / EU Stage V
Engine Power - ISO 14396:2002	786 hp
Gross Power - SAE J1995:2014	801 hp
Net Power - SAE J1349:2011 - High Ambient	681 hp
Emissions	Option 2 - China Nonroad Stage III emissions standards, equivalent to U.S. EPA Tier 2
Engine Power - ISO 14396: 2002	752 hp
Gross Power - SAE J1995:2014	766 hp
Net Power - SAE J1349:2011 - Standard Ambient	699 hp
Net Power - SAE J1349:2011 - High Ambient	648 hp
Bore	5.4 in
Stroke	6 in
Displacement	1649.5 in³
Peak Torque - Speed	2624 lb/ft
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
Blade Capacity Range	20.8 yd³
Transmission
Transmission Type	Cat Planetary Power Shift
Converter Drive - Forward 1	4.5 mile/h
Converter Drive - Forward 2	8.3 mile/h
Converter Drive - Forward 3	14.2 mile/h
Converter Drive - Reverse 1	4.9 mile/h
Converter Drive - Reverse 2	9.1 mile/h
Converter Drive - Reverse 3	15.5 mile/h
Direct Drive - Forward 1	Lock-up disabled
Direct Drive - Forward 2	8.5 mile/h
Direct Drive - Forward 3	15.2 mile/h
Direct Drive - Reverse 1	5.4 mile/h
Direct Drive - Reverse 2	9.6 mile/h
Direct Drive - Reverse 3	16.4 mile/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
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
Relief Valve Setting - Tilt Cylinders (Small Pump)	2920 psi
Hydraulic System - Steering
Steering System - Circuit	Pilot, load sensing
Steering System - Pump	Piston, variable displacement
Minimum Turning Radius - Over Blade	34 ft
Total Steering Angle	35 °
Maximum Flow	94.3 gal/min
Relief Valve Setting	4500 psi
Service Refill Capacities
Fuel Tank - Standard	286.6 gal (US)
Cooling System	54.9 gal (US)
Crankcase	20 gal (US)
Transmission	29.1 gal (US)
Differential - Final Drives - Front	71.6 gal (US)
Differential - Final Drives - Rear	68.9 gal (US)
Hydraulic System - Implement and Hydraulic Fan	68.9 gal (US)
Hydraulic System - Steering and Braking	34.9 gal (US)
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 co
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
Height - Top of Exhaust Pipe	16.6 ft
Height - Top of Hood	12.7 ft
Ground Clearance	2 ft
Centerline of Front Axle to Hitch	7.5 ft
Centerline of Rear Axle to Edge of Bumper	12.5 ft
Wheel Base	15.1 ft
Length - With Blade on Ground	36.5 ft

Long Term Value and 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 help improve your bottom line.

Resilient, durable blades are designed with excellent dozing and rolling characteristics.

Optimized axle mounting helps result in increased structural integrity.

Castings in the engine and frame are used in high stress areas to spread high loads.

One-piece castings help enhance strength in key pin areas.

Move More with Less Fuel

Experience reliable efficiency with complete control over injection timing, duration, and pressure with Mechanically Actuated Electronic Unit Injection (MEUI™).

World-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) help 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 helps protect investment and helps lengthen lifecycle.

Safety First

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) help increase operator awareness around the machine.

Cab-mounted LED strobes provide warning for others near the machine.

Wider stairs with reduced stair angles help increase safety for operators.

Access stairs via a powered platform from cab or ground level and have emergency exit access.

Technology that Gets Work Done

Integrated technologies assist with monitoring, managing, and enhancing your jobsite operations.

Product Link™ remote monitoring helps provide 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™) 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 help enhance awareness of the environment around the machine for increased safety.

Work In Comfort

Steering and Transmission Integrated Control System (STIC™) combines directional selection, gear selection, and steering into a single lever, helping to maximize 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 help keep operators comfortable throughout their entire shift.

Reduce Environmental Impact

Meets U.S. EPA Tier 4 Final emissions standards or equivalent to U.S. EPA Tier 2.

Automatic Engine Idle Shutdown helps conserve 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.

Save on Service and 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 help 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 help minimize fluid contamination.

Lighting inside the engine compartment helps improve visibility to service points.

Ecology drains help 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 helps prevent unnecessary wear from accelerating down declines.

Purpose-Built Cat Attachments

Dependable blades are designed for mining with press rib construction and optimized widths and capacities for excellent dozing and rolling.

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 helps enable 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 a long machine lifecycle.

Standard Equipment:

Note
- Standard and optional equipment may vary. Consult your Cat dealer for details.
Electrical And Lighting
- Alternator, 150 amp
- Batteries, maintenance free (4 - 1,400 CCA)
- Battery disconnect and jump start receptacle, bumper
- Deutsch terminal connectors
- Electrical system, 24V
- Electronic transmission control
- Lighting system, halogen (front and rear) lighting, access stairway, engine compartment
- Starter lockout in bumper
- Starting and charging system, 24V
- Transmission lockout in bumper
Powertrain
- Brakes, oil cooled, multi-disc, service/secondary
- Driveline parking brake
- Engine Cat C27
- Fuel priming pump (electric)
- Ground level engine shutdown switch
- Precleaner, engine air intake (above hood)
- Radiator, Aluminum Modular (AMR)
- Starting aid, (ether) automatic
- Throttle Lock electronic
- Torque Converter, Impeller clutch with lock-up clutch (ICTC) and rimpull control system
- Transmission, 534 mm (21 in) planetary power shift (electronic) (3F/3R)
Operator Environment
- Advisor display, displays real time operating information, performs calibrations and customizes operator setting
- Air conditioner and heater with automatic temperature control
- Air precleaner, powered
- Cab, sound-suppressed pressurized, separate external rolloever protective structure/falling objects protective structure (ROPS/FOPS)
- Cigar lighter and ashtray
- Coat hook
- Converter (12V, 10/15 amp) and power port
- Electro-hydraulic blade controls (joystick)
- Heater and defroster
- Horn, electric
- Instrumentation, gauges: - engine coolant temperature, fuel level, hydraulic oil temperature, powertrain oil temperature, tachometer
- Instrumentation, warning indicators: - Action alert system, three category - Automatic transmission model enable status - Brake malfunction - Bucket float status - Delayed engine shutdown status - Engine idle shutdown status - Engine malfunction - Fuel economy mode enable status - Hydraulic lockout - Lockup clutch enable status - Low fuel level - Parking brake status - Rimpull control enable status - Seatbelt warning - Secondary steering (if equipped) - Throttle lock status - Transmission gear
- Light, dome (cab)
- Lunchbox and beverage holders
- Seat, premium with heated and actively cooled leather, adjustable lumbar support, air adjustable bolsters on the seat and backrest, seat cushion tilt adjustment, and adjustable-length seat cushion
- Radio, AM/FM with Bluetooth^®, USB Port, 3.5 mm AUX input
- Tinted glass
- Wet-arm wipers/washers (front, rear and corner) intermittent front wiper
Safety
- Alarm, back-up
- Camera, rear vision
- Emergency platform exit
- Implement lockout switch
- Mirrors, rearview (externally mounted)
- Seat belt, retractable, 76 mm (3 in) wide
- Stairway, left and right rear access
- Steering and transmission lock lever, cab
- Steering, secondary
- Seat, trainer with lap belt, 76 mm (3in) wide
- Toe kicks
Service
- Axle ecology drains
- Case drain filters
- Coupling, Caterpillar O-ring face seals
- Engine, crankcase, 500 hour interval with CH4
- Front walkway around cab
- Guards, crankcase and powertrain
- Grouped/labeled lube points
- Battery disconnect and jump start receptacle, bumper
- Hitch, drawbar with pin
- Hoses, Cat XT^™
- Oil sampling valves
- Sight guages for steering, implement and transmission oil
- Vital Information Management System (VIMS) 3G with graphical information display: external data port, customizable operator profiles
Cooling
- Standard ambient package (recommended for site conditions that do not exceed 43°C (110°F)
Cold Weather
- Heated seat
Efficiency
- Economy mode with on demand throttle
- Positive flow control hydraulic system
- Impeller Clutch Torque Converter (ICTC) with lock-up clutch
- Steering, load sensing
- Soft detent controls
- Engine idle management features: - Auto idle kickdown - Delayed engine shutdown - Engine idle shutdown
Tramming
- Front fenders