631K

Flywheel Power - Tractor/Scraper: 570 hp / 425 kW
Scraper Capacity - Heaped: 34 yd³ / 26 m³
Top Speed - Loaded: 34.7 mile/h / 55.8 km/h

Quick loading, high travel speeds and the ability to load and dump on the run yield fast cycle times, allowing Cat Wheel Tractor-Scrapers to consistently deliver high productivity at the lowest cost per ton.

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631K Product Brochure

Specifications
Equipment
Related Products

General
Tires - Scraper	37.25R35**E3
Rated Load	37 200 kg (82,200 lb); 37.2 tonnes (41.1 tons)
Scraper Capacity - Struck	24 yd³ / 18.3 m³
Tires - Tractor	37.25R35**E3
Maximum Depth of Cut	17.7 in / 450 mm
Width - Cut	11.5 ft / 3.51 m
Scraper Capacity - Heaped	34 yd³ / 26 m³
Overall Width	12.93 ft / 3.94 m
Top Speed - Loaded	34.7 mile/h / 55.8 km/h
Fuel Tank Refill Capacity - Scraper	231 gal (US) / 874 l
Overall Shipping Height	12.75 ft / 3.89 m
180° Curb-to-Curb Turning Width	40.12 ft / 12.23 m
Maximum Depth of Spread	21.1 in / 535 mm

Engine
Flywheel Power - Tractor	570 hp / 425 kW
Rated Engine RPM - Tractor	1900 r/min
Engine Model - Tractor	Cat C18
Emissions	Cat C18 engine meets U.S. EPA Tier 4 Final/EU Stage IV emission standards.

Tractor Engine
Flywheel Power - Tractor/Scraper	570 hp / 425 kW

Scraper Bowl
Scraper Capacity - Heaped	34 yd³ / 26 m³

Transmission
Top Speed - Loaded	34.7 mile/h / 55.8 km/h

Service Refill Capacities
Fuel Tank	231 gal (US) / 874 l
Hydraulic System	37.5 gal (US) / 142 l
Diesel Exhaust Fluid (DEF)	8 gal (US) / 30.5 l
Cooling System	19.8 gal (US) / 75 l
Crankcase - Tractor	13.7 gal (US) / 52 l
Transmission System	29 gal (US) / 110 l

Dimensions
Front of Tractor to Front Axle	142.2 in / 3612 mm
Axle to Vertical Hitch Pin	20 in / 509 mm
Wheel Base	346.8 in / 8808 mm
Rear Axle - Rear of Machine	108 in / 2744 mm
Height - Scraper Blade Maximum	20 in / 510 mm
Ground Clearance - Tractor	26.1 in / 664 mm
Length - Overall Machine - Standard	597 in / 15164 mm
Length - Maximum (Push-Pull)	655.1 in / 16640 mm
Width - Tractor	137.8 in / 3499 mm
Height - Top of Cab	147 in / 3733 mm
Width - Rear Tire Centers	96.9 in / 2462 mm
Width - Overall Machine	155 in / 3937 mm
Width - Outside Rear Tires	143.2 in / 3636 mm
Width - Inside of Bowl	134 in / 3404 mm
Height - Overall Shipping	153.2 in / 3892 mm

Non Push-Pull
Overall Length	49.34 ft / 15.04 m
Operating Weight - Empty	102750 lb / 46600 kg

Push-Pull
Overall Length - With Bail Down	54.59 ft / 16.64 m
Operating Weight - Empty	106430 lb / 48275 kg

Cab
ROPS/FOPS	ROPS/FOPS meet “ISO Standards.”
Exterior Sound Level	The exterior sound power level for the standard machine (ISO 6393) is 111.5 dB(A).

Safety Criteria Compliance Standards
Steering System	ISO 5010:2007
Reverse Alarm	ISO 9533:2010
Seat Belt	SAE J386:FEB2006
Falling Object Protective Structure (FOPS)	ISO 3449:2005 Level II
Brakes	ISO 3450:2011
Rollover Protection Structure (ROPS)	ISO 3471:2008 for up to 21 282 kg (46,919 lb)

Travel Speeds - Runout
Transmission Gear - Sixth	19 mile/h / 30.6 km/h
Transmission Gear - Seventh	25.7 mile/h / 41.4 km/h
Transmission Gear - Reverse	6.2 mile/h / 9.9 km/h
Transmission Gear - Fourth	10.5 mile/h / 16.9 km/h
Transmission Gear - Eighth	34.7 mile/h / 55.8 km/h
Transmission Gear - First	3.4 mile/h / 5.5 km/h
Transmission Gear - Fifth	14.1 mile/h / 22.7 km/h
Transmission Gear - Third	7.7 mile/h / 12.4 km/h
Transmission Gear - Second	6.2 mile/h / 10 km/h

Implement Cycle Times
Bowl Lower	3.5 s
Bowl Raise	3.5 s
Bail Raise	1.5 s
Ejector Retract	8.5 s
Bail Lower	2.1 s
Apron Lower	3.8 s
Ejector Extend	8.5 s
Apron Raise	4 s

Standard Equipment

NOTE
- Standard and optional equipment may vary. Consult your Cat dealer for details.
POWER TRAIN – TRACTOR
- Cat C18
- Compression engine brake
- Electric start, 24V
- Air cleaner, dry type with precleaner
- Fan, hydraulic
- Ground level engine shutdown
- Radiator, aluminum unit core, 9 fins per inch
- Guard, crankcase
- Starting aid, ether
- Braking system:
  - Primary and secondary, wet disc, hydraulic
  - Parking, hydraulic-released, spring-applied
  - Throttle lock
- Transmission:
  - 8-speed planetary power shift
  - ECPC control
  - APECS software
  - Programmable top gear selection
  - Transmission hold
  - Differential lock
  - Guard, power train
  - Standard tire spin reduction
  - Ground speed control
  - Machine speed limit
  - Differential lock protection
POWER TRAIN – SCRAPER
- Braking system:
  - Primary and secondary, dry caliper, hydraulic actuated
ELECTRICAL – TRACTOR
- Alternator, 150 Amp
- Batteries (4), 12V, 1,000 CCA, maintenance free, high output
- Electrical system, 24V
- Lighting system:
  - Headlights, LED
  - Turn signals with hazard function, LED floodlights, (2) cutting edge (1) bowl, halogen side vision (2)
- Starting/charging receptacle
ELECTRICAL – SCRAPER
- Alarm, backup
- Lighting system:
  - Brake lights, LED
  - Turn signals with hazard function, LED
OPERATOR ENVIRONMENT – TRACTOR
- HVAC system, heat, AC, defrost
- Thermostat control of HVAC system
- Coat hook
- Lunchbox platform with holding strap
- Diagnostic connection (2)
- 12V power ports (2)
- Differential lock (1)
- Dome courtesy light
- Horn, electric
- T-Handle implement control
- Mirror, rearview
- Radio ready
- ROPS/FOPS cab, pressurized
- Keypad switches:
  - Throttle lock
  - Wipers/washers
  - Hazard lights
  - Retarding level select
  - Work lights on, off
  - Information mode on Messenger Display
- Safety tab rocker switches
- Seat belt, static two-piece
- Seat, Cat Advanced Ride Management (ARM), Cat Comfort Series 3, rotates 30 degrees
- Steering wheel, tilt, telescoping, padded
- Windows, right side emergency egress
- Windows, sliding
- Windows, laminated, zipped in
- Windshield wipers, front and rear windows, includes washers
- Door lock
- Messenger Display
- Gauges, warnings include:
  - Coolant temperature
  - Engine oil temperature
  - Hydraulic oil temperature
  - Diesel Particulate Filter (DPF) temperature
  - Fuel level
  - Park brake
  - Implement lockout
  - Brake system
  - Regeneration required
  - Throttle lock
  - System voltage
  - Secondary steering
  - Bail down
  - Ejector auto
  - Differential lock
  - Apron float
  - Transmission hold
  - Cushion hitch
  - High beam lights
  - Action lamp
  - Engine speed, rpm
  - Gear selection
  - DEF fill levels
FLUIDS
- Extended Life Coolant to –37° C (–34° F)
OTHER STANDARD EQUIPMENT – TRACTOR
- Advanced cushion hitch
- Accumulators (cushion hitch) with Canadian Registration Number (CRN)
- Fast oil change
- Fenders, non-metallic
- Heater, engine coolant 120V
- Rims (2)
- Tow hooks, front
- Vandalism locks
- Heater, engine coolant 120V
- Steering locks
OTHER STANDARD EQUIPMENT – SCRAPER
- Bowl:
  - 18.3 m3 (24 yd3), struck
  - 26 m3 (34 yd3), heaped
- Vandalism locks
- Rims (2)
- Hydraulic position sensing cylinders (bowl lift and apron)

Optional Equipment

NOTE
- Standard and optional equipment may vary. Consult your Cat dealer for details.
STEERING ARRANGEMENTS
- Secondary Steering Arrangement
INTEGRATED TECHNOLOGIES
- Sequence Assist Arrangement with Payload Estimator
- Load Assist
- Cat Grade Control with Load Assist
- Advanced Tire Spin Reduction
OTHER ATTACHMENTS
- Camera arrangement – Work Area Vision System (WAVS)
- Cab beacon
- Air horn
- Air horn and beacon
- Fender, scraper
- Guard, overflow
- Wiring group
- Push Pull
SERVICE INSTRUCTIONS
- Film arrangement – U.S. (ANSI)
- Film arrangement – International (ISO)

Grade

<p>Cat® Grade technologies combine digital design data, in-cab guidance, and automatic controls to enhance grading accuracy, reduce rework, and lower costs related to production earthmoving and rough, fine and finish grade applications.</p><p>Whether you're working on simple planes and slopes or complex contour designs, Grade technologies enable you to boost grading efficiency by as much as 50%, helping you get more work done – in less time and at a lower cost – than ever before.</p>

Model
Cat Grade Control for Wheel Tractor-Scrapers

Equipment Management

Cat® Equipment Management gives you access to the data you need to keep your equipment on the job site and earning money. You can track equipment location and hours, monitor machine use and health, then take informed action that will keep your operation running smoothly, efficiently and profitably.

Model
VisionLink®
Cat Inspect
Cat Product Link

Payload

Cat® Payload technologies provide on-the-go load weighing to assist operators with hitting precise load targets every time, helping to reduce load times, optimize loading efficiency and increase jobsite productivity. Operators can track daily productivity from the cab, with quick access to information such as truck target weights, loads and cycle counts, material movement and daily totals. When combined with Cat Link technologies, detailed data can be accessed remotely to manage overall operations and keep production targets on track.

Model
Cat Payload Estimator for Scrapers

Assist

On-board Cat® Technology gives you the edge. Operators of all experience levels will dig, load, and grade with more confidence, speed, and accuracy. The result? Better productivity and lower costs.

Model
Cat Sequence Assist for Wheel Tractor-Scrapers
Cat Load Assist for Wheel Tractor-Scrapers

Productivity

VisionLink® Productivity is a cloud-based application that is scalable to any size operation. Detailed Cat Production Measurement data, machine data and jobsite data are transmitted from the onboard Cat Product Link™ device directly to the web platform, for you to access wherever you are, via your mobile, tablet or desktop device.

Model
VisionLink® Productivity

Technology Kits

Caterpillar provides solutions to help customers in any industry improve efficiency and enhance safety.

Model
Cat® Grade Connectivity for Grade with 3D