Exterior View

Interior View

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.

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Engine Model

C27 Cat®

Rated Speed

1800r/min

Gross Power – ISO 14396

752hp

Gross Power – SAE J1995

766hp

Net Power – SAE J1349 – Standard Ambient

699hp

Net Power – SAE J1349 – High Ambient

648hp

Bore

5.4in

Stroke

6in

Displacement

1649.5in³

Peak Torque – Speed

2624lb/ft

Torque Rise

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

Operating Weight

165089lb

Blade Capacities

15.9 – 30.7 m3 (20.7 – 40.2 yd3)

Transmission Type

Cat Planetary Power Shift

Converter Drive – Forward 1

4.5mile/h

Converter Drive – Forward 2

8.3mile/h

Converter Drive – Forward 3

14.2mile/h

Converter Drive – Reverse 1

4.9mile/h

Converter Drive – Reverse 2

9.1mile/h

Converter Drive – Reverse 3

15.5mile/h

Direct Drive – Forward 1

Lock-up disabled

Direct Drive – Forward 2

8.5mile/h

Direct Drive – Forward 3

15.2mile/h

Direct Drive – Reverse 1

5.4mile/h

Direct Drive – Reverse 2

9.6mile/h

Direct Drive – Reverse 3

16.4mile/h

Output at 2,000 rpm and 6900 kPa (1,000 psi)

82gal/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)

2700psi

Relief Valve Setting – Tilt Cylinders (Small Pump)

2920psi

Steering System – Circuit

Pilot, load sensing

Steering System – Pump

Piston, variable displacement

Minimum Turning Radius – Over Blade

34ft

Total Steering Angle

35°

Maximum Flow

94.3gal/min

Relief Valve Setting

4500psi

Fuel Tank – Standard

286.6gal (US)

Cooling System

54.9gal (US)

Crankcase

20gal (US)

Transmission

29.1gal (US)

Differential – Final Drives – Front

71.6gal (US)

Differential – Final Drives – Rear

68.9gal (US)

Hydraulic System – Implement and Hydraulic Fan

68.9gal (US)

Hydraulic System – Steering and Braking

34.9gal (US)

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.

Front

Fixed

Rear

Trunnion

Oscillation Angle

8.5°

Brakes

Meets ISO 3540:2011

Operator Sound Level (ISO 6396:2008)

69dB(A)

Machine Sound Level (ISO 6395:2008)

115dB(A)

Operator Sound Level (ISO 6396:2008)

69dB(A)

Machine Sound Level (ISO 6395:2008)

113dB(A)

ROPS/FOPS

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

Height – Top of ROPS

17.2ft

Height – Top of Exhaust Pipe

16.6ft

Height – Top of Hood

12.7ft

Ground Clearance

2ft

Centerline of Front Axle to Hitch

7.5ft

Centerline of Rear Axle to Edge of Bumper

12.5ft

Wheel Base

15.1ft

Length – With Blade on Ground

36.5ft

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)

Note
- Standard and optional equipment may vary. Consult your Cat dealer for details.
Power Train
- 50° C (-58° F) antifreeze
- Engine oil change system, high speed, Wiggins
- Engine block heater 120V or 240V
- High ambient cooling – software
Blades
- Semi-U – 17.8 m3 (23.3 yd3)
- HD Semi-U – 16.1 m3 (21.1 yd3)
- Coal – 30.7 m3 (40.2 yd3)
Operator Environment
- Cab precleaner
- AM/FM/MP3 radio
- Satellite Sirius radio with Bluetooth
- LED warning strobe
- CB radio ready
- Window sun shade
Tramming
- Front and rear roading fenders
Miscellaneous Attachments
- Fast fill fuel system (Shaw-Aero)
- Axle oscillation stop
- Paint, black blade rear
Other
- Venturi stack