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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.

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SPECIFICATION SUMMARY
  • Flywheel Power: Tractor/Scraper 304 kW (407 hp)
  • Scraper Capacity: Heaped 24.0 yd3
  • Top Speed (Loaded) 33.5 mph
  • Width - Overall Machine 141.1 in

PRICE (USD)
Call 800-637-5000 for rate information

Tractor Engine

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

Scraper Bowl

  • Scraper Capacity: Heaped
    24.0 yd3
  • Scraper Capacity - Heaped
    24 yd³

Transmission

  • Top Speed (Loaded)
    33.5 mph
  • Top Speed - Loaded
    33.5 mile/h

Dimensions

  • Width - Overall Machine
    141.1 in
  • Width - Tractor
    133.1 in
  • Width - Inside of Bowl
    120.0 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
  • Wheelbase
    314.9 in
  • Rear Axle to Rear of Machine
    114.1 in
  • Length - Overall Machine (Standard)
    551.8 in
  • Width - Overall Machine - Ladder Down
    149.2 in
  • Width - Rear Tire Centers
    90.2 in
  • Length - Maximum (Push-Pull)
    613.2 in
  • 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 in
  • Rear Axle - Rear of Machine
    114.1 in
  • Length - Overall Machine - Standard
    551.8 in
  • Width - Overall Machine - Ladder Down
    149.2 in
  • Width - Rear Tire Centers
    90.2 in

Engine

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

Travel Speeds (Runout)

  • Transmission Gear: Eighth
    33.5 mph
  • Transmission Gear: Fifth
    13.6 mph
  • Transmission Gear: First
    3.1 mph
  • Transmission Gear: Fourth
    10.1 mph
  • Transmission Gear: Reverse
    5.7 mph
  • Transmission Gear: Second
    5.5 mph
  • Transmission Gear: Seventh
    24.8 mph
  • Transmission Gear: Sixth
    18.4 mph
  • Transmission Gear: Third
    7.5 mph

General Data

  • 180° Curb-to-Curb Turning Width
    38.71 ft
  • Fuel Tank Refill Capacity: Scraper
    201.0 gal
  • Maximum Depth of Cut
    12.4 in
  • Maximum Depth of Spread
    21.3 in
  • Overall Shipping Height
    13.22 ft
  • Overall Width
    11.71 ft
  • Rated Load
    26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons)
  • Scraper Capacity: Heaped
    24.0 yd3
  • Scraper Capacity: Struck
    17.1 yd3
  • Tires: Scraper
    33.25R29**E3
  • Tires: Tractor Drive
    33.25R29**E3
  • Top Speed (Loaded)
    33.5 mph
  • Width of Cut
    10.3 ft

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
  • 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

Implement Cycle Times

  • Apron Lower
    3.8 Seconds
  • Apron Raise
    2.95 Seconds
  • Bail Lower
    3.2 Seconds
  • Bail Raise
    1.8 Seconds
  • Bowl Lower
    3.5 Seconds
  • Bowl Raise
    3.0 Seconds
  • Ejector Extend
    5.2 Seconds
  • Ejector Retract
    6.7 Seconds
  • Apron Lower
    3.8 s
  • Apron Raise
    2.95 s
  • Bail Lower
    3.2 s
  • Bail Raise
    1.8 s
  • Bowl Lower
    3.5 s
  • Bowl Raise
    3 s
  • Ejector Extend
    5.2 s
  • Ejector Retract
    6.7 s

Service Refill Capacities

  • Cooling System
    11.89 gal
  • Crankcase
    8.08 gal
  • Diesel Exhaust Fluid
    8.0572 gal
  • Fuel Tank
    216.09 gal
  • Hydraulic System
    21.926 gal
  • Transmission System
    24.76 gal
  • Cooling System
    11.89 gal (US)
  • Crankcase
    8.08 gal (US)
  • Diesel Exhaust Fluid
    8.057 gal (US)
  • Fuel Tank
    216.09 gal (US)
  • Hydraulic System
    21.926 gal (US)
  • Transmission System
    24.76 gal (US)

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
  • 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

Push-Pull

  • Operating Weight - Empty
    80630 lb
  • Overall Length - With Bail Down
    51.1 ft

Non Push-Pull

  • Operating Weight - Empty
    79787 lb
  • Overall Length
    45.9 ft

General

  • 180° Curb-to-Curb Turning Width
    38.71 ft
  • Fuel Tank Refill Capacity - Scraper
    201 gal (US)
  • Maximum Depth of Cut
    12.4 in
  • Maximum Depth of Spread
    21.3 in
  • Overall Shipping Height
    13.22 ft
  • Overall Width
    11.71 ft
  • Rated Load
    26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons)
  • Scraper Capacity - Heaped
    24 yd³
  • Scraper Capacity - Struck
    17.1 yd³
  • Tires - Scraper
    33.25R29**E3
  • Tires - Tractor Drive
    33.25R29**E3
  • Top Speed - Loaded
    33.5 mile/h
  • Width - Cut
    10.3 ft

Travel Speeds - Runout

  • Transmission Gear - Eighth
    33.5 mile/h
  • Transmission Gear - Fifth
    13.6 mile/h
  • Transmission Gear - First
    3.1 mile/h
  • Transmission Gear - Fourth
    10.1 mile/h
  • Transmission Gear - Reverse
    5.7 mile/h
  • Transmission Gear - Second
    5.5 mile/h
  • Transmission Gear - Seventh
    24.8 mile/h
  • Transmission Gear - Sixth
    18.4 mile/h
  • Transmission Gear - Third
    7.5 mile/h

EFFICIENCY THROUGH TECHNOLOGY

  • Machine Speed Limit is designed to take the place of top gear selection. If the machine top speed needs to be limited the operator can select the top speed through the display or the top speed can be set in ET. This will allow the machine to find the correct gear that works best for the engine and transmission. Allowing the engine and transmission to select the correct gear to pull the load in most cases resulting in a lower engine load factor and lower fuel burn verses using top gear selection that required the machine to run at engine speeds at or close high idle.
  • Ground Speed Control sets the desired top speed by the operator if job site conditions or segment speed limits require a speed less than full run out. Machine Speed Limit is intended for use when top speed needs to be limited for longer durations and Ground Speed Control is intended for use when the top speed needs to be reduced for shorter segments or intermediate periods of time. The operator can set the desired top speed and the machine will find the correct gear that works best for the engine and transmission. Allowing the engine and transmission to select the correct gear to pull the load in most cases will result in a lower engine load factor and lower fuel burn verses top gear selection.

OPERATOR COMFORT AND CONTROL

  • The interior of the K Series cabs has improved the operator comfort and visibility by redesigning the dash area and key pad placement.
  • Advanced Cushion Hitch prevents end stroke by having the ability to predict end stroke events and manage the rate of dampening. The desired result is improved hitch repair, reduced maintenance and improved operator ride in rough conditions.
  • 621K Series steering system design requires significantly less steering effort. The reduced steering effort will allow for decreased operator fatigue and a more efficient operator resulting in possible higher rates of production late in the work cycle.

BUILT-IN SAFETY FEATURES

  • Differential Lock Engagement Protection feature allows the machine to prevent the operator from engaging the differential lock when damage could occur.
  • The open bowls now come standard with bowl side overflow guards to help prevent material from flowing over the bowl sides and falling onto the draft arms where material becomes lodged between the bowl side and draft arm resulting in decreased work cycle times.
  • Engine Over Speed Protection - In the event of an engine over speed situation, the compression brake or brakes will automatically engage with no operator input. The machine determines the over speed condition based on rate of acceleration and applies compression brakes automatically.

SAVE ON MAINTENANCE TIME

  • In cold weather conditions the machine will use the Auto Stall feature to help warm up the transmission oil faster resulting in the machine shifting out of torque converter drive (2nd gear) faster than on previous models.
  • The filter bank located at the rear of the engine compartment has undergone improvements for serviceability by raising the filter bank up for easier access.

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)
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