621k

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621K – Wheel Tractor- Scraper

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.

Everything about the 621K – Wheel Tractor- Scraper adds up to fast cycle times. With the ability to load up quickly, travel at high speeds and dump on the run, this wheel tractor scraper is a must-have piece of Caterpillar® equipment for a consistently high level of productivity. Best of all, it also helps to maintain the lowest cost per ton, saving you more money. This is just one of the many wheel tractor scrapers we offer. Find out if this is the right CAT construction equipment for your needs. Contact us today!

  • Standard Equipment
  • Optional Equipment
  • Specs

Standard Equipment

  • POWER TRAIN - TRACTOR
    • Cat C13 ACERT 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

  • 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)

Specs

Overview

Long Name:
621K Wheel Tractor-Scraper
Name:
621K
Brand:
Caterpillar
Status:
Current

General

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

Engine

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

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

Cooling System:
11.89 gal (US) / 45 l
Crankcase:
8.08 gal (US) / 30.58 l
Diesel Exhaust Fluid:
8.057 gal (US) / 30.5 l
Fuel Tank:
216.09 gal (US) / 818 l
Hydraulic System:
21.926 gal (US) / 83 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 - Overall Machine - Ladder Down:
149.2 in / 3790 mm
Width - Rear Tire Centers:
90.2 in / 2290 mm

Non Push-Pull

Operating Weight - Empty:
79787 lb / 36185 kg
Overall Length:
45.9 ft / 14.02 m

Push-Pull

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

Cab

Exterior Sound Level:
The exterior sound power level for the standard machine (ISO 6393) is 111.5 dB(A).
ROPS/FOPS:
Meets SAE and ISO standards

Safety Criteria Compliance Standards

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

Travel Speeds - Runout

Transmission Gear - Eighth:
33.5 mile/h / 53.9 km/h
Transmission Gear - Fifth:
13.6 mile/h / 21.9 km/h
Transmission Gear - First:
3.1 mile/h / 5 km/h
Transmission Gear - Fourth:
10.1 mile/h / 16.3 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 - Seventh:
24.8 mile/h / 39.9 km/h
Transmission Gear - Sixth:
18.4 mile/h / 29.6 km/h
Transmission Gear - Third:
7.5 mile/h / 12.1 km/h

Implement Cycle Times

Apron Lower:
3.8 s / 3.8 s
Apron Raise:
2.95 s / 2.95 s
Bail Lower:
3.2 s / 3.2 s
Bail Raise:
1.8 s / 1.8 s
Bowl Lower:
3.5 s / 3.5 s
Bowl Raise:
3 s / 3 s
Ejector Extend:
5.2 s / 5.2 s
Ejector Retract:
6.7 s / 6.7 s