844K

Cat Large 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 844K 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.


SPECIFICATIONS
Engine
Engine Model Cat® C27 ACERT™
Gross Power 752 HP
Bore 5.4 in
Stroke 6 in
Displacement 1649.5 in³
Torque Rise 18 %
Emissions U.S. EPA Tier 4 Final or Tier 2 Equivalent
Gross Power - ISO 14396 752 HP
Gross Power - SAE J1995 766 HP
Net Power - SAE J1349 699 HP
Net Power - SAE J1349 - High Ambient 648 HP
Net Power - SAE J1349 - Standard Ambient 699 HP
Peak Torque - Speed 2624 lb/ft
Rated Speed 1800 r/min


Weights
Operating Weight 165089 lb


Transmission
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 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
Direct Drive - Forward 1 Lock-up disabled
Transmission Type Cat Planetary Power Shift


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)


Cab
Air Conditioning Standard air conditioning system contains environmentally friendly R134a refrigerant
Cab - ROPS/FOPS (1) Cat cab with separate ROPS/FOPS is standard in North America, Europe and Japan.
Cab - ROPS/FOPS (2) SAE J11040 APR88, ISO 3471:2008, ISO 3471:1994
FOPS FOPS meets SAE J231 JAN81 and ISO 3449:1992 Level II criteria.
ROPS ROPS meets SAE J11040 APR88, ISO 3471:2008 and ISO 3471:1994 criteria.


Brakes
Brakes Meets ISO 3540:2011


Axles
Front Fixed
Rear Trunnion
Oscillation Angle 8.5 °


Blade
Blade Capacity Range 15.9-30.7 m3 (20.7-40.2 yd3)


Sound Performance - Standard
Machine Sound Level (ISO 6395:2008) 115 dB(A)
Operator Sound Level (ISO 6396:2008) 69 dB(A)


Sound Performance - Suppression
Machine Sound Level (ISO 6395:2008) 113 dB(A)
Operator Sound Level (ISO 6396:2008) 69 dB(A)


Hydraulic System - Lift/Tilt
Cylinder, Double Acting - Tilt and Tip, Bore and Stroke 210 mm × 188 mm (8.25 in × 7.4 in)
Cylinders, Double Acting - Lift, Bore and Stroke 133 mm × 1535 mm (5.25 in × 60.4 in)
Output at 2,000 rpm and 6900 kPa (1,000 psi) 82 gal/min
Relief Valve Setting - Bulldozer (Large Pump) 2700 psi
Relief Valve Setting - Tilt Cylinders (Small Pump) 2920 psi


Hydraulic System - Steering
Maximum Flow 94.3 gal/min
Minimum Turning Radius - Over Blade 34 ft
Relief Valve Setting 4500 psi
Steering System - Circuit Pilot, load sensing
Steering System - Pump Piston, variable displacement
Total Steering Angle 35 °


Dimensions (Approximate)
Centerline of Front Axle to Hitch 7.5 ft
Centerline of Rear Axle to Edge of Bumper 12.5 ft
Ground Clearance 2 ft
Height - Top of Exhaust Pipe 16.6 ft
Height - Top of Hood 12.7 ft
Height - Top of ROPS 17.2 ft
Length - With Blade on Ground 36.5 ft
Wheel Base 15.1 ft


BENEFITS & FEATURES
Structures



Power Train



Hydraulics



Operator Station



Technology Solutions



Cat MineStar System



Safety



Serviceability



Customer Support



Sustainability



Cat Blades



EQUIPMENT
Standard Equipment

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
  • Camera, rear vision
  • Cigar lighter and ashtray
  • Coat hook
  • Electro-hydraulic blade controls (seat mounted)
  • Flip-up armrest
  • Heater and defroster
  • Horn, electric
  • Implement hydraulic lockout
  • 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, Cat comfort (cloth) air suspension
  • Seat belt, retractable, 76 mm (3 in) wide
  • STIC control system with steering lock
  • Tinted glass
  • Trainer seat with lap belt
  • Vital Information Management System (VIMS) 3G with graphical information display: external data port, customizable operator profiles
  • Wet-arm wipers/washers (front, rear and corner) intermittent front wiper
POWER TRAIN
  • Brakes, full hydraulic, enclosed, oil-disc
  • Axle-shaft oil-disc service brake
  • Electro hydraulic parking brake
  • Case drain filters
  • Cat clean emission module (Tier 4 only)
  • Demand fan
  • Engine Cat C27 ACERT
  • Fuel priming pump (electric)
  • Ground level engine shutoff, bumper
  • Mufflers (under hood) (Tier 2 only)
  • Precleaner, engine air intake
  • Radiator, Aluminum Modular (AMR)
  • Separated cooling system
  • Starting aid, (ether) manual override
  • Throttle Lock
  • 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
  • Alarm, back-up
  • Alternator, 150 amp
  • Batteries, maintenance free (2 - 1,400 CCA)
  • Converter, 10/15 amp, 24V to 12V
  • Deutsch component connectors
  • Electrical system, 24V
  • Electronic transmission control
  • Lighting system, halogen (front and rear) lighting, access stairway, engine compartment
  • Starter, electric
  • Starter lockout in bumper
  • Starting receptacle for emergency start
  • Transmission lockout in bumper
OTHER
  • Axle temperature sensor
  • Battery disconnect and jump start receptacle, bumper
  • Coupling, Caterpillar O-ring face seals
  • Economy mode with on demand throttle
  • Emergency platform egress
  • Engine, crankcase, 500 hour interval with CH4
  • Engine idle management features: - Auto idle kickdown - Delayed engine shutdown - Engine idle shutdown
  • Fenders, steel (front)
  • Guards, crankcase and power train
  • Grouped/labeled lube points
  • Hitch, drawbar with pin
  • Hoses, Cat XT
  • Oil sampling valves
  • Positive flow control hydraulic system
  • Product Link™
  • Sight Gauges: hydraulic tanks, steering/fan and implement/brake, and transmission
  • Stairway, left and right rear access
  • Steering, load sensing
  • Steering, secondary
  • Toe kicks
  • Vandalism protection caplocks
  • Venturi stack
  • Premixed 50% concentration of extended life coolant with freeze protection to -34° C (-29° F)

Optional Equipment

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/CD/MP3 radio
  • Satellite Sirius radio with Bluetooth
  • LED warning strobe
  • CB radio ready
  • Window sun shade
MISCELLANEOUS ATTACHMENTS
  • Front and rear roading fenders
  • Fast fill fuel system (Shaw-Aero)
  • Axle oscillation stop
  • Paint, black blade rear

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