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.

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

Specs

Tractor Engine

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

Scraper Bowl

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

Transmission

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

Dimensions

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

Engine

Flywheel Power: Tractor
407.0hp
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
2000r/min
Flywheel Power - Tractor
407HP
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
33.5mph
Transmission Gear: Fifth
13.6mph
Transmission Gear: First
3.1mph
Transmission Gear: Fourth
10.1mph
Transmission Gear: Reverse
5.7mph
Transmission Gear: Second
5.5mph
Transmission Gear: Seventh
24.8mph
Transmission Gear: Sixth
18.4mph
Transmission Gear: Third
7.5mph

General Data

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

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

Service Refill Capacities

Cooling System
11.89gal
Crankcase
8.08gal
Diesel Exhaust Fluid
8.0572gal
Fuel Tank
216.09gal
Hydraulic System
21.926gal
Transmission System
24.76gal
Cooling System
11.89gal (US)
Crankcase
8.08gal (US)
Diesel Exhaust Fluid
8.057gal (US)
Fuel Tank
216.09gal (US)
Hydraulic System
21.926gal (US)
Transmission System
24.76gal (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
80630lb
Overall Length - With Bail Down
51.1ft

Non Push-Pull

Operating Weight - Empty
79787lb
Overall Length
45.9ft

General

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

Travel Speeds - Runout

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

Features

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.
  • 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.
  • 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.
  • 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.
  • 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)