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Overview

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.

Engine

Units:
Engine Model Cat® C27 ACERT™ Cat® C27 ACERT™ Less
Gross Power 752.0 hp 561.0 kW Less
Bore 5.4 in 137.2 mm Less
Stroke 6.0 in 152.4 mm Less
Displacement 1649.5 in3 27.03 L Less
Torque Rise 18.0 % 18.0 % Less
Emissions U.S. EPA Tier 4 Final or Tier 2 Equivalent U.S. EPA Tier 4 Final or Tier 2 Equivalent Less
Gross Power – ISO 14396 752.0 hp 561.0 kW Less
Gross Power – SAE J1995 766.0 hp 571.0 kW Less
Net Power – SAE J1349 699.0 hp 521.0 kW Less
Net Power – SAE J1349 (High Ambient) 648.0 hp 483.0 kW Less
Net Power – SAE J1349 (Standard Ambient) 699.0 hp 521.0 kW Less
Peak Torque @ (speed) 2624.0 lb ft 3557.0 N·m Less
Rated Speed 1800.0 RPM 1800.0 RPM Less

Weights

Operating Weight 165089.0 lb 74883.0 kg Less

Transmission

Converter Drive – Forward 1 4.5 mph 7.3 km/h Less
Converter Drive – Forward 2 8.3 mph 13.3 km/h Less
Converter Drive – Forward 3 14.2 mph 22.9 km/h Less
Converter Drive – Reverse 1 4.9 mph 7.9 km/h Less
Converter Drive – Reverse 2 9.1 mph 14.7 km/h Less
Converter Drive – Reverse 3 15.5 mph 24.9 km/h Less
Direct Drive – Forward 2 8.5 mph 13.7 km/h Less
Direct Drive – Forward 3 15.2 mph 24.5 km/h Less
Direct Drive – Reverse 1 5.4 mph 8.7 km/h Less
Direct Drive – Reverse 2 9.6 mph 15.4 km/h Less
Direct Drive – Reverse 3 16.4 mph 26.4 km/h Less
Direct Drive – Forward 1 Lock-up disabled Lock-up disabled Less
Transmission Type Cat Planetary Power Shift Cat Planetary Power Shift Less

Service Refill Capacities

Fuel Tank – Standard 286.6 gal 1085.0 L Less
Cooling System 54.9 gal 208.0 L Less
Crankcase 20.0 gal 76.0 L Less
Transmission 29.1 gal 110.0 L Less
Differentials and Final Drives – Front 71.6 gal 271.0 L Less
Differentials and Final Drives – Rear 68.9 gal 261.0 L Less
Hydraulic System – Implement and Hydraulic Fan 68.9 gal 261.0 L Less
Hydraulic System – Steering and Braking 34.9 gal 132.0 L Less

Cab

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

Brakes

Brakes Meets ISO 3540:2011 Meets ISO 3540:2011 Less

Axles

Front Fixed Fixed Less
Rear Trunnion Trunnion Less
Oscillation Angle 8.5 Degrees 8.5 Degrees Less

Blade

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

Sound Performance – Standard

Machine Sound Level (ISO 6395:2008) 115.0 dB(A) 115.0 dB(A) Less
Operator Sound Level (ISO 6396:2008) 69.0 dB(A) 69.0 dB(A) Less

Sound Performance – Suppression

Machine Sound Level (ISO 6395:2008) 113.0 dB(A) 113.0 dB(A) Less
Operator Sound Level (ISO 6396:2008) 69.0 dB(A) 69.0 dB(A) Less

Hydraulic System – Lift/Tilt

Cylinder, Double-acting: Lift, Bore and Stroke 133 mm × 1535 mm (5.25 in × 60.4 in) 133 mm × 1535 mm (5.25 in × 60.4 in) Less
Cylinder, Double-acting: Tilt and Tip, Bore and Stroke 210 mm × 188 mm (8.25 in × 7.4 in) 210 mm × 188 mm (8.25 in × 7.4 in) Less
Output at 2,000 rpm and 6900 kPa (1,000 psi) 82.0 gal/min 311.0 L/min Less
Relief Valve Setting – Bulldozer (Large Pump) 2700.0 psi 18650.0 kPa Less
Relief Valve Setting – Tilt Cylinders (Small Pump) 2920.0 psi 20150.0 kPa Less

Hydraulic System – Steering

Maximum Flow 94.3 gal/min 357.0 L/min Less
Minimum Turning Radius (over blade) 34.0 ft 10369.0 mm Less
Relief Valve Setting 4500.0 psi 31000.0 kPa Less
Steering System – Circuit Pilot, load sensing Pilot, load sensing Less
Steering System – Pump Piston, variable displacement Piston, variable displacement Less
Total Steering Angle 35.0 Degrees 35.0 Degrees Less

Dimensions (Approximate)

Center Line of Front Axle to Hitch 7.5 ft 2300.0 mm Less
Center Line of Rear Axle to Edge of Bumper 12.5 ft 3795.0 mm Less
Ground Clearance 2.0 ft 596.0 mm Less
Height to Top of Exhaust Pipe 16.6 ft 5049.0 mm Less
Height to Top of Hood 12.7 ft 3862.0 mm Less
Height to Top of ROPS 17.2 ft 5240.0 mm Less
Length with Blade on Ground 36.5 ft 11120.0 mm Less
Wheelbase 15.1 ft 4600.0 mm Less

Structures

Best built for the toughest conditions.


Power Train

Move material more efficiently with improved power and control.


Hydraulics

Productivity enabling you to move more and make more.


Operator Station

Best-in-class operator comfort and ergonomics.


Technology Solutions

Greater productivity through Integrated Electronic Systems.


Cat MineStar System

Work more productively.


Safety

Making your safety our priority.


Serviceability

Enabling high uptime by reducing your service time.


Customer Support

Your Cat dealers know how to keep your mining machines productive.


Sustainability

Making sustainable progress possible.


Cat Blades

Dependable dozing with blades designed for your application.


844K 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)

844K 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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