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621 Wheel Tractor-Scraper

Our wheel tractor-scrapers have long been considered the basic method of moving volumes of material, and the Cat® 621 Wheel Tractor-Scraper is no exception. Known for its ability to be push-loaded and high travel speeds, it’s always an earthmover’s first tool of choice when working in challenging load areas. With an open bowl and a single engine, this machine is designed to handle a wide range of material types ranging from sand to ripped rock 609.6 mm (24 “) or less in size.

Flywheel Power - Tractor/Scraper
304 kW (407 hp)
Scraper Capacity - Heaped
24 yd³
Top Speed - Loaded
33.5 mile/h
Width - Overall Machine
141.1 in

Tractor Engine

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

Scraper Bowl

Scraper Capacity - Heaped
24yd³

Transmission

Top Speed - Loaded
33.5mile/h

Dimensions

Width - Overall Machine
141.1in
Width - Tractor
133.1in
Width - Inside of Bowl
120in
Width - Outside Rear Tires
128.9in
Height - Overall Shipping
158.6in
Height - Top of Cab
142.2in
Ground Clearance - Tractor
21.9in
Front of Tractor to Front Axle
122.8in
Axle to Vertical Hitch Pin
21.3in
Height - Scraper Blade Maximum
20.5in
Wheel Base
314.9in
Rear Axle - Rear of Machine
114.1in
Length - Overall Machine - Standard
551.8in
Length - Maximum (Push-Pull)
613.2in
Width - Overall Machine - Ladder Down
149.2in
Width - Rear Tire Centers
90.2in

General

Overall Shipping Height
13.22ft
Overall Width
11.75ft
Scraper Capacity - Heaped
24yd³
Fuel Tank Refill Capacity - Scraper
216.1gal (US)
Tires - Scraper
33.25R29**E3
Width - Cut
10.3ft
Maximum Depth of Spread
21.3in
Top Speed - Loaded
33.5mile/h
Rated Load
26 127 kg (57,610 lb); 26.19 tonnes (28.81 tons)
180° Curb-to-Curb Turning Width
38.71ft
Scraper Capacity - Struck
17.1yd³
Maximum Depth of Cut
12.4in
Tires - Tractor Drive
33.25R29**E3

Engine

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

Service Refill Capacities

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

Non Push-Pull

Operating Weight - Empty
79787lb
Overall Length
45.9ft

Push-Pull

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

Cab

Exterior Sound Level
The exterior sound power level for the standard machine (ISO 6393:2008) is 118 dB(A).
ROPS/FOPS
Meets SAE and ISO standards

Safety Criteria Compliance Standards

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

Travel Speeds - Runout

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

Implement Cycle Times

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

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
  • 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
  • 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
  • Service Instructions
    • Film arrangement - U.S. (ANSI)
    • Film arrangement - International (ISO)

Specifications

Standard/Optional Features