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.
Caterpillar
621K Wheel Tractor-Scraper
Overview
Photos
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621K
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Exterior
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Interior
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Documents
Specifications
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General
Spec Value Maximum Depth of Cut 12.4 in Maximum Depth of Spread 21.3 in 180° Curb-to-Curb Turning Width 38.71 ft Scraper Capacity - Struck 17.1 yd³ Tires - Scraper 33.25R29**E3 Overall Width 11.71 ft Overall Shipping Height 13.22 ft Width - Cut 10.3 ft Tires - Tractor Drive 33.25R29**E3 Top Speed - Loaded 33.5 mile/h Fuel Tank Refill Capacity - Scraper 201 gal (US) Scraper Capacity - Heaped 24 yd³ Rated Load 26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons) -
Engine
Spec Value Rated Engine RPM - Tractor 2000 r/min Engine Model - Tractor Cat C13 Flywheel Power - Tractor 407 HP Note Cat C13 engine meets U.S. Environmental Protection Agency (EPA) Tier 4 Final/EU Stage IV engine emission standards. -
Tractor Engine
Spec Value Flywheel Power - Tractor/Scraper 304 kW (407 hp) -
Scraper Bowl
Spec Value Scraper Capacity - Heaped 24 yd³ -
Transmission
Spec Value Top Speed - Loaded 33.5 mile/h -
Service Refill Capacities
Spec Value Hydraulic System 21.926 gal (US) Cooling System 11.89 gal (US) Fuel Tank 216.09 gal (US) Crankcase 8.08 gal (US) Diesel Exhaust Fluid 8.057 gal (US) Transmission System 24.76 gal (US) -
Dimensions
Spec Value Width - Overall Machine 141.1 in Width - Tractor 133.1 in Width - Inside of Bowl 120 in Width - Outside Rear Tires 128.9 in Height - Overall Shipping 158.6 in Height - Top of Cab 142.2 in Ground Clearance - Tractor 21.9 in Front of Tractor to Front Axle 122.8 in Axle to Vertical Hitch Pin 21.3 in Height - Scraper Blade Maximum 20.5 in Wheel Base 314.9 ft Rear Axle - Rear of Machine 114.1 in Length - Maximum (Push-Pull) 613.2 in Length - Overall Machine - Standard 551.8 in Width - Rear Tire Centers 90.2 in Width - Overall Machine - Ladder Down 149.2 in -
Non Push-Pull
Spec Value Overall Length 45.9 ft Operating Weight - Empty 79787 lb -
Push-Pull
Spec Value Operating Weight - Empty 80630 lb Overall Length - With Bail Down 51.1 ft -
Cab
Spec Value 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
Spec Value 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
Spec Value Transmission Gear - Sixth 18.4 mile/h Transmission Gear - Fifth 13.6 mile/h Transmission Gear - Reverse 5.7 mile/h Transmission Gear - Second 5.5 mile/h Transmission Gear - Third 7.5 mile/h Transmission Gear - First 3.1 mile/h Transmission Gear - Eighth 33.5 mile/h Transmission Gear - Fourth 10.1 mile/h Transmission Gear - Seventh 24.8 mile/h -
Implement Cycle Times
Spec Value 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)