844

844 Wheel Dozer

Cat Wheel Dozers are designed with durability built in, ensuring maximum availability through multiple life cycles. With optimized performance and simplified serviceability, our machines allow you to move more material efficiently and safely at a lower cost per ton. Engineered for your demanding work in large dozing applications, the 844 Wheel Dozer is the largest in the Cat Wheel Dozer line and is an ideal match for large mining operations, power generating utilities, the general contracting industry and wherever mobility, versatility and compaction is needed.

Category:

Long Term Value and Durability

Move More with Less Fuel

Safety First

Technology that Gets Work Done

Work In Comfort

Reduce Environmental Impact

Save on Service and Maintenance

Purpose-Built Cat Attachments

Standard Equipment

NOTE
  • Standard and optional equipment may vary. Consult your Cat dealer for details.
OPERATOR ENVIRONMENT
  • Air conditioner and heater with automatic temperature control
  • Cab, sound-suppressed pressurized, protective structure (ROPS/FOPS), radio ready for (entertainment) includes antenna, speakers and converter (12V, 10-15 amp)
  • 12V power port for mobile phone or laptop connection
  • Cigar lighter and ashtray
  • Coat hook
  • Electro-hydraulic blade controls (joystick)
  • Flip-up armrest
  • Heater and defroster
  • Horn, electric
  • Instrumentation, gauges: - Engine coolant temperature - Fuel level - Ground speed - Gear - Hydraulic oil temperature - Speedometer/tachometer - Torque converter temperature
  • 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
  • Keypad, control with indicator lights: - Auto trans mode speed range - Auto/manual transmission mode - Lockup clutch - Reduced rimpull - Throttle lock
  • Light, dome (cab)
  • Lunchbox and beverage holders
  • Mirrors, rearview (externally mounted)
  • 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
  • STIC control system with steering lock
  • Tinted glass
  • Wet-arm wipers/washers (front, rear and corner) intermittent front wiper
  • Converter (12V, 10/15 amp) and power port
POWER TRAIN
  • Brakes, oil cooled, multi-disc, service/secondary
  • Axle-shaft oil-disc service brake
  • Electro hydraulic parking brake
  • Cat clean emission module (Tier 4 only)
  • Demand fan
  • Engine Cat C27
  • Fuel priming pump (electric)
  • Ground level engine shutoff
  • Mufflers (under hood) (Tier 2 only)
  • Precleaner, engine air intake
  • Radiator, Aluminum Modular (AMR)
  • Separated cooling system
  • Starting aid, (ether) automatic
  • Throttle Lock electronic
  • Torque Converter, Impeller Clutch with lock-up clutch feature and rimpull control system
  • Transmission, 534 mm (21 in) planetary power shift (electronic) (3F/3R)
ELECTRICAL
  • Alternator, 150 amp
  • Batteries, maintenance free (4 - 1,400 CCA)
  • Deutsch terminal connectors
  • Electrical system, 24V
  • Electronic transmission control
  • Lighting system, halogen (front and rear) lighting, access stairway, engine compartment
  • Starting and charging system, 24V
  • Starter lockout in bumper
  • Starting receptacle for emergency start
  • Transmission lockout in bumper
SERVICE
  • Vital Information Management System (VIMS) 3G with graphical information display: external data port, customizable operator profiles
  • Case drain filters
  • Coupling, Caterpillar O-ring face seals
  • Guards, crankcase and power train
  • Hitch, drawbar with pin
  • Hoses, Cat XT
  • Oil sampling valves
  • Product Link™
SAFETY
  • Camera, rear vision
  • Implement lockout switch
  • Seat belt, retractable, 76 mm (3 in) wide
  • Trainer seat with lap belt
  • Alarm, back-up
  • Emergency platform egress
  • Stairway, left and right rear access
  • Steering, secondary
  • Toe kicks
TRAMMING
  • Fenders, steel (front)
OTHER
  • Axle temperature sensor
  • Battery disconnect and jump start receptacle, bumper
  • Economy mode with on demand throttle
  • Engine, crankcase, 500 hour interval with CH4
  • Engine idle management features: - Auto idle kickdown - Delayed engine shutdown - Engine idle shutdown
  • Grouped/labeled lube points
  • Positive flow control hydraulic system
  • Sight Gauges: hydraulic tanks, steering/fan and implement/brake, and transmission
  • Steering, load sensing
  • Vandalism protection caplocks
  • Premixed 50% concentration of extended life coolant with freeze protection to -34° C (-29° F)

Additional information

Engine Model

C27 Cat®

Engine - Rated Speed

1800.0 r/min ( 1800.0 r/min )

Engine - Gross Power - ISO 14396

561.0 kW ( 752.0 HP )

Engine - Gross Power - SAE J1995

571.0 kW ( 766.0 HP )

Engine - Net Power - SAE J1349 - Standard Ambient

521.0 kW ( 699.0 HP )

Engine - Net Power - SAE J1349 - High Ambient

483.0 kW ( 648.0 HP )

Engine - Bore

137.2 mm ( 5.4 in )

Engine - Stroke

152.4 mm ( 6.0 in )

Engine - Displacement

27.03 l ( 1649.5 in³ )

Engine - Peak Torque - Speed

3557.0 N·m ( 2624.0 lb/ft )

Engine - Torque Rise

18.0 % ( 18.0 % )

Engine - 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

Operating Specifications - Operating Weight

74883.0 kg ( 165089.0 lb )

Operating Specifications - Blade Capacities

15.9 – 30.7 m3 (20.7 – 40.2 yd3)

Transmission Type

Cat Planetary Power Shift

Transmission - Converter Drive - Forward 1

7.3 km/h ( 4.5 mile/h )

Transmission - Converter Drive - Forward 2

13.3 km/h ( 8.3 mile/h )

Transmission - Converter Drive - Forward 3

22.9 km/h ( 14.2 mile/h )

Transmission - Converter Drive - Reverse 1

7.9 km/h ( 4.9 mile/h )

Transmission - Converter Drive - Reverse 2

14.7 km/h ( 9.1 mile/h )

Transmission - Converter Drive - Reverse 3

24.9 km/h ( 15.5 mile/h )

Transmission - Direct Drive - Forward 1

Lock-up disabled

Transmission - Direct Drive - Forward 2

13.7 km/h ( 8.5 mile/h )

Transmission - Direct Drive - Forward 3

24.5 km/h ( 15.2 mile/h )

Transmission - Direct Drive - Reverse 1

8.7 km/h ( 5.4 mile/h )

Transmission - Direct Drive - Reverse 2

15.4 km/h ( 9.6 mile/h )

Transmission - Direct Drive - Reverse 3

26.4 km/h ( 16.4 mile/h )

Hydraulic System - Lift/Tilt - Output at 2,000 rpm and 6900 kPa (1,000 psi)

311.0 l/min ( 82.0 gal/min )

Hydraulic System - Lift/Tilt - Cylinders, Double Acting - Lift, Bore and Stroke

133 mm × 1535 mm (5.25 in × 60.4 in)

Hydraulic System - Lift/Tilt - Cylinder, Double Acting - Tilt and Tip, Bore and Stroke

210 mm × 188 mm (8.25 in × 7.4 in)

Hydraulic System - Lift/Tilt - Relief Valve Setting - Bulldozer (Large Pump)

18650.0 kPa ( 2700.0 psi )

Hydraulic System - Lift/Tilt - Relief Valve Setting - Tilt Cylinders (Small Pump)

20150.0 kPa ( 2920.0 psi )

Hydraulic System - Steering - Steering System - Circuit

Pilot, load sensing

Hydraulic System - Steering - Steering System - Pump

Piston, variable displacement

Hydraulic System - Steering - Minimum Turning Radius - Over Blade

10369.0 mm ( 34.0 ft )

Hydraulic System - Steering - Total Steering Angle

35.0 ° ( 35.0 ° )

Hydraulic System - Steering - Maximum Flow

357.0 l/min ( 94.3 gal/min )

Hydraulic System - Steering - Relief Valve Setting

31000.0 kPa ( 4500.0 psi )

Service Refill Capacities - Fuel Tank - Standard

1085.0 l ( 286.6 gal (US) )

Service Refill Capacities - Cooling System

208.0 l ( 54.9 gal (US) )

Service Refill Capacities - Crankcase

76.0 l ( 20.0 gal (US) )

Service Refill Capacities - Transmission

110.0 l ( 29.1 gal (US) )

Service Refill Capacities - Differential - Final Drives - Front

271.0 l ( 71.6 gal (US) )

Service Refill Capacities - Differential - Final Drives - Rear

261.0 l ( 68.9 gal (US) )

Service Refill Capacities - Hydraulic System - Implement and Hydraulic Fan

261.0 l ( 68.9 gal (US) )

Service Refill Capacities - Hydraulic System - Steering and Braking

132.0 l ( 34.9 gal (US) )

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

Axles - Rear

Trunnion

Axles - Oscillation Angle

8.5 ° ( 8.5 ° )

Brakes

Meets ISO 3540:2011

Sound Performance - Standard - Operator Sound Level (ISO 6396:2008)

69.0 dB(A) ( 69.0 dB(A) )

Sound Performance - Standard - Machine Sound Level (ISO 6395:2008)

115.0 dB(A) ( 115.0 dB(A) )

Sound Performance - Suppression - Operator Sound Level (ISO 6396:2008)

69.0 dB(A) ( 69.0 dB(A) )

Sound Performance - Suppression - Machine Sound Level (ISO 6395:2008)

113.0 dB(A) ( 113.0 dB(A) )

Cab - ROPS/FOPS

ISO 3471:2008 and ISO 3449:2005 Level II Standards

Dimensions (Approximate) - Height - Top of ROPS

5240.0 mm ( 17.2 ft )

Dimensions (Approximate) - Height - Top of Exhaust Pipe

5049.0 mm ( 16.6 ft )

Dimensions (Approximate) - Height - Top of Hood

3862.0 mm ( 12.7 ft )

Dimensions (Approximate) - Ground Clearance

596.0 mm ( 2.0 ft )

Dimensions (Approximate) - Centerline of Front Axle to Hitch

2300.0 mm ( 7.5 ft )

Dimensions (Approximate) - Centerline of Rear Axle to Edge of Bumper

3795.0 mm ( 12.5 ft )

Dimensions (Approximate) - Wheel Base

4600.0 mm ( 15.1 ft )

Dimensions (Approximate) - Length - With Blade on Ground

11120.0 mm ( 36.5 ft )

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