621K

Scraper Capacity - Heaped: 24 yd³ / 18.4 m³
Top Speed - Loaded: 33.5 mile/h / 53.9 km/h
Width - Overall Machine: 141.1 in / 3585 mm

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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621K Product Brochure 621 Technical Specs

Specifications
Equipment
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General
Maximum Depth of Cut	12.4 in / 315 mm
Maximum Depth of Spread	21.3 in / 540 mm
180° Curb-to-Curb Turning Width	38.71 ft / 11.8 m
Scraper Capacity - Struck	17.1 yd³ / 13 m³
Tires - Scraper	33.25R29**E3
Overall Width	11.71 ft / 3.57 m
Overall Shipping Height	13.22 ft / 4.03 m
Width - Cut	10.3 ft / 3.14 m
Tires - Tractor Drive	33.25R29**E3
Top Speed - Loaded	33.5 mile/h / 53.9 km/h
Fuel Tank Refill Capacity - Scraper	201 gal (US) / 763 l
Scraper Capacity - Heaped	24 yd³ / 18.4 m³
Rated Load	26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons)

Engine
Rated Engine RPM - Tractor	2000 r/min
Engine Model - Tractor	Cat C13
Flywheel Power - Tractor	407 hp / 304 kW
Note	Cat C13 engine meets U.S. Environmental Protection Agency (EPA) Tier 4 Final/EU Stage IV engine emission standards.

Tractor Engine
Flywheel Power - Tractor/Scraper	304 kW (407 hp)

Scraper Bowl
Scraper Capacity - Heaped	24 yd³ / 18.4 m³

Transmission
Top Speed - Loaded	33.5 mile/h / 53.9 km/h

Service Refill Capacities
Hydraulic System	21.926 gal (US) / 83 l
Cooling System	11.89 gal (US) / 45 l
Fuel Tank	216.09 gal (US) / 818 l
Crankcase	8.08 gal (US) / 30.58 l
Diesel Exhaust Fluid	8.057 gal (US) / 30.5 l
Transmission System	24.76 gal (US) / 93 l

Dimensions
Width - Overall Machine	141.1 in / 3585 mm
Width - Tractor	133.1 in / 3381 mm
Width - Inside of Bowl	120 in / 3048 mm
Width - Outside Rear Tires	128.9 in / 3275 mm
Height - Overall Shipping	158.6 in / 4029 mm
Height - Top of Cab	142.2 in / 3612 mm
Ground Clearance - Tractor	21.9 in / 557 mm
Front of Tractor to Front Axle	122.8 in / 3119 mm
Axle to Vertical Hitch Pin	21.3 in / 540 mm
Height - Scraper Blade Maximum	20.5 in / 520 mm
Wheel Base	314.9 in / 7998 mm
Rear Axle - Rear of Machine	114.1 in / 2898 mm
Length - Maximum (Push-Pull)	613.2 in / 15576 mm
Length - Overall Machine - Standard	551.8 in / 14015 mm
Width - Rear Tire Centers	90.2 in / 2290 mm
Width - Overall Machine - Ladder Down	149.2 in / 3790 mm

Non Push-Pull
Overall Length	45.9 ft / 14.02 m
Operating Weight - Empty	79787 lb / 36185 kg

Push-Pull
Operating Weight - Empty	80630 lb / 36567 kg
Overall Length - With Bail Down	51.1 ft / 15.58 m

Cab
ROPS/FOPS	Meets SAE and 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
Brakes	ISO 3450:1996
Seat Belt	SAE J386:JUN1985
Steering System	ISO 5010:2007
Reverse Alarm	ISO 9533:2010
Rollover Protection Structure (ROPS)	ISO 3471:2008 for up to 17 084 kg (37,664 lb)
Falling Object Protective Structure (FOPS)	ISO 3449:2005 Level II

Travel Speeds - Runout
Transmission Gear - Sixth	18.4 mile/h / 29.6 km/h
Transmission Gear - Fifth	13.6 mile/h / 21.9 km/h
Transmission Gear - Reverse	5.7 mile/h / 9.2 km/h
Transmission Gear - Second	5.5 mile/h / 8.9 km/h
Transmission Gear - Third	7.5 mile/h / 12.1 km/h
Transmission Gear - First	3.1 mile/h / 5 km/h
Transmission Gear - Eighth	33.5 mile/h / 53.9 km/h
Transmission Gear - Fourth	10.1 mile/h / 16.3 km/h
Transmission Gear - Seventh	24.8 mile/h / 39.9 km/h

Implement Cycle Times
Bail Lower	3.2 s
Bail Raise	1.8 s
Apron Lower	3.8 s
Apron Raise	2.95 s
Ejector Extend	5.2 s
Ejector Retract	6.7 s
Bowl Raise	3 s
Bowl Lower	3.5 s

Standard Equipment

NOTE
- Standard and optional equipment may vary. Consult your Cat dealer for details.
POWER TRAIN - TRACTOR
- Cat C13 engine with MEUI™
- Cat engine brake
- Electric start, 24 Volt
- Air cleaner, dry type with precleaner
- Fan, hydraulic
- Ground level engine shutdown
- Radiator, aluminum unit core, 9 fins per inch
- Guard, crankcase
- Muffler (only for less or non-regulated regions engine arrangement only)
- 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, wet disc, hydraulic
ELECTRICAL - TRACTOR
- Alternator, 150 Amp
- Batteries (4), 12V, 1,000 CCA, maintenance free, high output
- Electrical system, 24V
- Lighting system: - Headlights, halogen - 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 - 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 pin, front
- Vandalism locks
- Heater, engine coolant 120V
OTHER STANDARD EQUIPMENT - SCRAPER
- Bowl: - 18.4 m3 (24 yd3), heaped - 14.1 m3 (18.4 yd3), struck
- Vandalism locks
- 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
- Load Assist
- Cat Grade Control with Load Assist
OTHER ATTACHMENTS
- Camera arrangement - WAVS
- Steering lock - external
- Cab beacon
- Air horn
- Air horn and beacon
- Fender, scraper
- Guard, overflow
- Wiring group
- Year of manufacture plate
WORK LIGHT ATTACHMENTS
- HID work lights
AMBIENT CAPABILITY ARRANGEMENTS
- Cooling, high ambient HRC
- Cooling, low ambient HRC
- Cooling, high ambient LRC
- Cooling, low ambient LRC
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

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