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© 2014 Caterpillar. All Rights Reserved. CAT, CATERPILLAR, BUILT FOR IT, their respective logos, “Caterpillar Yellow,” the “Power Edge” trade dress as well as corporate and product identity used herein, are trademarks of Caterpillar and may not be used without permission.
800.437.4228www.hawthornecat.com
Caterpillar® Performance
Handbook Edition 44
WHEEL TRACTOR
SCRAPERS
24
Edition 44 24-1
CONTENTSWHEEL TRACTOR-SCRAPERSSpecifications: Elevating Bowl . . . . . . . . . . . . . . . . . . . . . . . . . . 24-2 Single Engine Open Bowl . . . . . . . . . . . . . . . . . 24-3 Optional Push-Pull . . . . . . . . . . . . . . . . . . . . . . 24-3 Twin Engine Open Bowl . . . . . . . . . . . . . . . . . . . 24-4 Coal Bowl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-6Ground Engaging Tools: Router Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-7 Cutting Edges . . . . . . . . . . . . . . . . . . . . . . . . . . 24-7 Bowl Side Protectors . . . . . . . . . . . . . . . . . . . . . 24-8 Elevating Scraper . . . . . . . . . . . . . . . . . . . . . . . . 24-9 Auger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-9 Material Application Guide . . . . . . . . . . . . . . .24-10 Push-Load TTT Match . . . . . . . . . . . . . . . . . . .24-10
Tire Options, All Models. . . . . . . . . . . . . . . . . . . .24-11Cushion Hitch . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-12Wheel Tractor-Scraper Anatomy . . . . . . . . . . . . 24-12Use of Rimpull-Speed-Gradeability Curves. . . . 24-13Fixed Times for Scrapers. . . . . . . . . . . . . . . . . . . 24-15Use of Retarder Curves. . . . . . . . . . . . . . . . . . . . 24-15Curves/Charts: 621K Rimpull, Retarding . . . . . . . . . . . . . . . . 24-17 623K Rimpull, Retarding . . . . . . . . . . . . . . . . .24-19 627K Rimpull, Retarding . . . . . . . . . . . . . . . . 24-21 631G Rimpull, Retarding . . . . . . . . . . . . . . . . 24-23 637G Rimpull, Retarding . . . . . . . . . . . . . . . . 24-25 657G Rimpull, Retarding . . . . . . . . . . . . . . . . 24-27
WHEEL TRACTOR-SCRAPERS
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24-2 Edition 44
Wheel Tractor-Scrapers Specifications● Elevating Bowl
MODEL 623KFlywheel Power 304 kW 407 hpApprox. Operating Weight (Empty)◀ 39 937 kg 88,061 lbScraper Capacity: Struck 14.4 m3 18.8 yd3
Scraper Capacity: Heaped 17.6 m3 23 yd3
Rated Load 25 038 kg 55,200 lbWeight Distribution — Empty:
Drive 63%Rear 37%
Weight Distribution — Loaded:Drive 52%Rear 48%
Engine Model C13 ACERTRated Engine RPM 2000Displacement 12.5 L 763 in3
Top Speed (Loaded) 53.9 km/h 33.5 mph180° Curb-to-Curb Turning Width —Tires — Standard:
Tractor 33.25R29**E3Scraper 33.25R29**E3
Width of Cut 3.14 m 10'4"Maximum Depth of Cut 262 mm 10.3"Elevator Flight Spacing 520 mm 20"Number of Flights 15Maximum Floor Opening 1.34 mm 4'4"Maximum Depth of Spread 465 mm 18'3"Fuel Tank Refill Capacity 763 L 201 U.S. galGENERAL DIMENSIONS:
Height — Overall Shipping 3.77 m 12'3"Wheelbase 8.37 m 27'5"Overall Length 13.77 m 45'2"Overall Width 3.57 m 11'7"Center Line of Scraper Tread 2.29 m 7'5"Center Line of Tractor Tread 2.28 m 7'4"
◀ Operating weight includes coolants, lubricants, full fuel tank and operator. Operating weights for the 623K are based on U.S. EPA Tier 4 Final/EU Stage IV platforms machines. Deduct 248 kg (547 lb) for the operating weight for the 623K U.S. EPA Tier 2 equivalent.
ElevatingThe Elevating Wheel Tractor-Scraper is a self-loading hauling system with the added ability to mix/homogenize
material and do precise finishing work.
Elevating Bowl Advantages:● Load/haul/spread with little support equipment● Conditions material as it loads● Capable to work as a single machine● Aids in compaction● Finishing work● Low rolling resistance applications● Short cut areas● Favorable material types● Windrow applications● Thin, precise lifts
Single Engine Advantages(Compared to Tandem Engine):● Low fuel usage● Lower gross vehicle weight
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24
Edition 44 24-3
Wheel Tractor-ScrapersSpecifications● Single Engine Open Bowl
● Optional Push-Pull
MODEL 621K 631GFlywheel Power 304 kW 407 hp 345/373 kW 462/500 hpApprox. Operating Weight (Empty)◀ 36 185 kg 79,787 lb 47 628 kg 105,002 lbScraper Capacity: Struck 13 m3 17.1 yd3 18.3 m3 24 yd3
Scraper Capacity: Heaped 18.4 m3 24 yd3 26 m3 34 yd3
Rated Load 26 127 kg 57,610 lb 37 013 kg 81,600 lbWeight Distribution — Empty:
Drive 65% 64%Rear 35% 36%
Weight Distribution — Loaded:Drive 53% 52%Rear 47% 48%
Engine Model C13 ACERT™ C18 ACERTRated Engine RPM 2000 1800Displacement 12.5 L 763 in3 18.1 L 1105 in3
Top Speed (Loaded) 53.9 km/h 33.5 mph 53 km/h 33 mph180° Curb-to-Curb Turning Width 11.8 m 38'7" 12.2 m 40'1"Tires — Tractor Drive 33.25R29**E3 37.25R35★★E3Tires — Scraper 33.25R29**E3 37.25R35★★E3Width of Cut 3.14 m 10'4" 3.51 m 11'6"Maximum Depth of Cut 315 mm 12.4" 437 mm 17.2"Maximum Depth of Spread 540 mm 21.3" 480 mm 18.9"Fuel Tank Refill Capacity 763 L 201 U.S. gal 814 L 215 U.S. galGENERAL DIMENSIONS: Non Push-Pull
Height — Overall Shipping 4.03 m 13'2" 3.86 m 12'8"Wheelbase 7.99 m 26'2" 8.77 m 28'9"Overall Length 14.02 m 45'10" 14.71 m 48'3"Overall Width 3.57 m 11'7" 3.94 m ** 12'11"Shipping Width
(Draft Arm on Inside of Bowl) — 3.63 m * 11'11"Center Line of Scraper Tread 2.29 m 7'5" 2.46 m 8'1"Center Line of Tractor Tread 2.28 m 7'4" 2.46 m 8'1"
GENERAL DIMENSIONS: Push-PullOperating Weight (Empty) 36 567 kg 80,630 lbOverall Length (With Bail Down) 15.58 m 51'1"Weight Distribution — Empty:
Drive 65%Rear 35%
Weight Distribution — Loaded:Drive 53%Rear 47%
**Optional Shipping Configuration.**Standard Shipping Configuration.◀ Operating weight includes standard machine, coolant, lubricants, full fuel tank, and operator. Operating weights for the 621K are based on Tier 4 Final/
Stage IV platforms machines. Deduct 247 kg (545 lb) for the operating weight for the 621K Tier 2 equivalent.
Single Engine Open BowlThe Open Bowl Wheel Tractor-Scraper is available as a self-loading, 621K push pull or push-loaded hauling system
with a broad material appetite. The broad material appe tite allows the Open Bowl Wheel Tractor-Scraper to be used in general construction, heavy construction, mining, and waste applications.
Open Bowl Advantages:● Quick load/unload● Spread evenly on-the-go● Broad material appetite● Aids in compaction● Varying material conditions● High production
Single Engine Advantages(Compared to Tandem Engine):● Low fuel usage● Lower gross vehicle weight● Loads quickly with the aid of a Track-Type Tractor and
hauls to fill carrying minimum machine weight
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24-4 Edition 44
MODEL 627K 637G 657GFlywheel Power: Tractor 304 kW 407 hp 345/373 kW 462/500 hp 421/447 kW 564/600 hpFlywheel Power: Scraper 216 kW 290 hp 198/211 kW 266/283 hp 306/337 kW 410/451 hpApprox. Operating Weight (Empty)◀ 40 913 kg 90,213 lb 51 963 kg 114,559 lb 68 384 kg 150,760 lbScraper Capacity: Struck 13 m3 17.1 yd3 18.3 m3 24 yd3 24.5 m3 32 yd3
Scraper Capacity: Heaped 18.4 m3 24 yd3 26 m3 34 yd3 33.6 m3 44 yd3
Rated Load 26 127 kg 57,610 lb 37 013 kg 81,600 lb 47 174 kg 104,000 lbWeight Distribution — Empty: Front 59% 59% 58%Weight Distribution — Empty: Rear 41% 41% 42%Weight Distribution — Loaded: Front 50% 50% 50%Weight Distribution — Loaded: Rear 50% 50% 50%Engine Model: Tractor C13 ACERT C18 ACERT C18 ACERTEngine Model: Scraper C9.3 ACERT C9 ACERT C15 ACERTRated Engine RPM: Tractor 2000 1800 1800Rated Engine RPM: Scraper 2150 2000 1800Displacement: Tractor 12.5 L 763 in3 18.1 L 1105 in3 18.1 L 1105 in3
Displacement: Scraper 9.29 L 567 in3 8.8 L 538 in3 15.2 L 928 in3
Top Speed (Loaded) 53.9 km/h 33.5 mph 53 km/h 33 mph 53 km/h 33 mph180° Curb-to-Curb Turning Width 11.8 m 38'7" 12.2 m 40'1" 14.2 m 46'7"Tires — Tractor Drive 33.25R29**E3 37.25R35★★E3 40.5/75R39★★E3Tires — Scraper 33.25R29**E3 37.25R35★★E3 40.5/75R39★★E3Width of Cut 3.14 m 10'4" 3.51 m 11'6" 3.85 m 12'8"Maximum Depth of Cut 315 mm 12.4" 437 mm 17" 440 mm 17.3"Maximum Depth of Spread 540 mm 21.3" 480 mm 18.9" 660 mm 26"Fuel Tank Refill Capacity: Tractor — — —Fuel Tank Refill Capacity: Scraper 1272 L 336 U.S. gal 1268 L 335 U.S. gal 1597 L 424 U.S. galGENERAL DIMENSIONS:
Non Push-PullHeight — Overall Shipping 4.03 m 13'2" 4.18 m 13'9" 4.62 m 15'2"Wheelbase 7.99 m 26'2" 8.77 m 28'9" 9.96 m 32'8"Overall Length 14.02 m 45'10" 14.71 m 48'3" 16.2 m 53'1"Overall Width 3.57 m 11'7" 3.94 m ** 12'11" 4.35 m 14'4"Shipping Width
(Draft Arm on Inside of Bowl) — 3.63 m * 11'11" 3.91 m ** 12'10"Center Line of Scraper Tread 2.29 m 7'5" 2.46 m 8'1" 2.81 m 9'3"Center Line of Tractor Tread 2.28 m 7'4" 2.46 m 8'1" 2.63 m 8'8"
GENERAL DIMENSIONS: Push-PullOperating Weight (Empty)◀ 42 168 kg 92,980 lb 54 057 kg 119,175 lb 72 804 kg 160,505 lbOverall Length 15.58 m 51'1" 16.64 m 54'7" 18.01 m 59'1"Weight Distribution — Empty: 59% 60% 58%
FrontRear 41% 40% 42%
Weight Distribution — Loaded: 50% 51% 51%FrontRear 50% 49% 49%
**Optional Shipping Configuration.**Standard Shipping Configuration.◀ Operating weight includes standard machine, coolant, lubricants, full fuel tank, and operator. Operating weights for the 627K are based on Tier 4 Final/
Stage IV platforms machines. Deduct 413 kg (910 lb) for the operating weight for the 627K Tier 2 equivalent.
Wheel Tractor-Scrapers Specifications● Twin Engine Open Bowl● Optional Push-Pull
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Edition 44 24-5
Wheel Tractor-ScrapersSpecifications● Twin Engine Open Bowl
● Optional Push-Pull
Twin Engine Open BowlThe Open Bowl Wheel Tractor-Scraper is available as a self-loading, push-loaded, or push-pulled hauling system
with a broad material appetite. The broad material appetite allows the Open Bowl Wheel Tractor-Scraper to be used in general construction, heavy construction, mining, and waste applications.
Open Bowl Advantages:● Quick load/unload● Spread evenly on-the-go● Broad material appetite● Aids in compaction● High Production● Varying material conditions● High production
Twin Engine Advantages(Compared to Single Engine):● More power for loading, traveling up grades, or over
fill area● Faster cycle times● High rolling resistance applications● Variable site conditions● Poor underfoot conditions● Steep grades● Can be self-loaded, push loaded with the aid of a
Track-Type Tractor, or push-pulled
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24-6 Edition 44
Wheel Tractor-Scrapers Specifications● Coal Bowl
MODEL 637G 657GFlywheel Power: Tractor 345/373 kW 462/500 hp 421/447 kW 564/600 hpFlywheel Power: Scraper 198/211 kW 266/283 hp 306/337 kW 410/451 hpApprox. Operating Weight (Empty) 54 050 kg 118,909 lb 72 190 kg 158,817 lbScraper Capacity: Struck 31 m3 41 yd3 45 m3 59 yd3
Scraper Capacity: Heaped 38 m3 50 yd3 56 m3 73 yd3
Rated Load 34 473 kg 76,000 lb 49 895 kg 110,000 lbApprox. Operating Weight (Loaded) 88 409 kg 194,909 lb 121 933 kg 268,817 lbTop Speed (Loaded) 53 km/h 33 mph 53 km/h 33 mph180° Curb-to-Curb Turning Width 13.7 m 44'10" 15.6 m 51'3"GENERAL DIMENSIONS:
Height — Overall Shipping 4.18 m 13'9" 4.62 m 15'2"Wheelbase 9.53 m 31'3" 11.01 m 36'1"Overall Length 15.47 m 50'9" 17.21 m 56'5"Overall Width 3.94 m ** 12'11" 4.35 m 14'4"Shipping Width
(Draft Arm on Inside of Bowl) 3.63 m * 11'11" 3.91 m ** 12'10"Center Line of Scraper Tread 2.46 m 8'1" 2.81 m 9'3"Center Line of Tractor Tread 2.46 m 8'1" 2.63 m 8'8"
**Optional Shipping Configuration.**Standard Shipping Configuration.◀ Operating weight includes standard machine, coolant, lubricants, full fuel tank, and operator.
Coal BowlCoal Bowl Wheel Tractor-Scrapers are typically used for building and maintaining coal stockpiles and hauling coal to
the supply system at coal power plants. The self-loading capability, large capacity, coal pile compaction, and high speed of Coal Bowl Wheel Tractor-Scrapers make them the tool of choice for moving coal both short and long dis-tances. Coal Bowl Wheel Tractor-Scrapers are available in the 637G and 657G tandem engine models.
Coal Bowl Advantages:● Load hoppers● Manage coal stockpiles● Compaction reduces risk of spontaneous combustion
in coal stockpile● Exclusively designed large capacity coal bowls
Notes:● The 637G Coal Scraper is 736 mm (29.0") longer, the
bowl sides are 476 mm (18.7") taller, and the apron is 499 mm (19.6") taller than its earthmoving counterpart.
● The 657G Coal Scraper is 1072 mm (42.2") longer, the bowl sides are 1010 mm (39.8") taller, the apron is 677 mm (26.7") taller, and the ejector is 944 mm (37.2") taller than its earthmoving counterpart.
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Edition 44 24-7
Wheel Tractor-ScrapersGround Engaging Tools● Router Bits
● Cutting Edges
WHEEL TRACTOR-SCRAPER GROUND ENGAGING TOOLS
ROUTER BITSCat® router bits help prevent wear and costly dam-
age to the scraper bowl. All router bits are forged DH-2 steel and through-hardened to prevent break-age and prolong life.
Standard Router Bit● Available for all models.
Heavy Duty Router Bit● 45% more wear material than the standard router
bits.
ARM Router Bit● Available for virtually all models in high abra sion,
low impact applications.
Level Router Bit● Used for clean-up work and keeps material in front
of the cutting edges.
CUTTING EDGESCat cutting edges are rolled from DH-2 steel and
through-hardened for strength and wear resistance and are available in standard, abrasion resistant material (ARM), and serrated versions.
Standard center and end-cutting edges● For use on all scraper models (open bowl, auger and
elevating scraper).
● Used in low-to-medium abrasion and low-to-high impact conditions.
● Available in various thicknesses and sizes for both stinger and level-cut arrangements.
● Can be reversed or propellered for prolonged edge use and improved cost per hour.
ARM center and end cutting edges● For use on all scraper models (open bowl, auger and
elevating scraper).
● Used in medium-to-high abrasion and low-to-high impact conditions.
● Available in various thicknesses and sizes for both stinger and level-cut arrangements.
● Can be reversed or propellered for prolonged edge use and improved cost per hour.
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24-8 Edition 44
Wheel Tractor-Scrapers Ground Engaging Tools● Cutting Edges● Bowl Side Protectors
ARM serrated center cutting edge● For use on 620, 630 and 650 Series Scraper (open
bowl, auger and elevating scraper).
● Used in medium-to-high abrasion and medium-to-high impact conditions where increased penetration and aggressive digging action is required.
● Available in various thicknesses and sizes for both stinger and level-cut arrangements.
● Edges can be reversed or propellered around for prolonged edge use and improved cost per hour.
Integrated tooth center cutting edge● For use on 623 and 633 Elevating Scraper, and
620 Series Auger Scraper.
● Used in low-to-high abrasion conditions for improved penetration in medium-to-high impact conditions.
● Include cast-in-place adapters, which accept pin-on tips.
Bolt-on adapters● For use on Elevating Scraper 613, 615, 623 and 633.
● Used in low-to-high abrasion conditions and low-to-medium impact conditions when improved pen-etration is needed.
● Bolt-on adapters accept pin-on tips.
Special serrated cutting edges● For site-specific applications and conditions.
● Use on 620, 630 and 650 Series Scraper (open bowl, auger and elevating scraper).
● Custom-designed edges have sharp teeth for low-to-medium abrasion and low-to-medium impact conditions.
BOWL SIDE PROTECTORS
● Bowl Side protectors are available in two styles: Bolt on bowl side protectors and pin on bowl side protectors.
● Bolt on style takes a weld on adapter plate that accepts the bolt on bowl side protector. This is available for 620, 630 and 650 Series scrapers.
● Pin on style takes a weld on adapter plate that accepts the pin on bowl side protector. This is avail-able for 620, 630 and 650 Series scrapers.
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Edition 44 24-9
Wheel Tractor-Scrapers
24
Ground Engaging Tools● Elevating Scraper
● Auger
ELEVATING SCRAPER
● Flight assemblies.
● Chain assemblies.*
● Sprockets.*
● Idlers and idler groups.
● Rollers and roller groups.
* Optional heavy-duty chain and sprocket for 623G available through your Cat dealer.
In today’s competitive environment, machines must operate efficiently. Inspections identify prob-lems that cause machines to burn more fuel and shorten component life.
AUGER
Plastic liners● For use in low-to-high abrasion, plastic liners pre-
vent sticky material from building up on the auger.
Steel wear plates● For use in medium-to-high abrasion and medium-to-
high impact conditions to protect the auger surface.
Standard auger shoe● For use in low-to-medium abrasion and low-to-
high impact conditions where accelerated wear is not a problem.
Tungsten carbide auger shoe● For use in medium-to-high abrasion and medium-
to-high impact conditions where accelerated wear is a problem.
Auger cutting edge● For use in low-to-high abrasion and low-to-high
impact conditions.
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24-10 Edition 44
Wheel Tractor-Scrapers Ground Engaging Tools● Material Application Guide● Push-Load TTT Match
Material Application Guide Elevator
Self-LoadSingle and
Tandem Engine
Push-LoadSingle and
Tandem Engine Push Pull
AugerTandem Engine Coal Bowl Remarks
Decomposed Granite/Soil Excellent loading
Decomposed Granite (Ripped)
Excellent loading by push- loading or push-pull to reduce cutting of tires
Moist Top Soil Good to Excellent Loading
Top Soil Excellent for WTS
Clay/Sand Mixture Excellent for WTS
Sand Good to Excellent loading, but some cases may need to be push loaded by a TTT or Push-Pull
Antigo Excellent WTS material: lower portion may require ripping depending on material density
Coal Excellent for WTS: ripping may be required in dense material
Limestone In natural state, not suitable for WTS
Granite Not suitable for WTSSandstone For WTS to be productive
in sandstone, material needs to be ripped. In some cases where density is high, WTS would not be a good fit
Shot Rock Below 610 mm (24") good for WTS when push-loaded by a TTT to reduce cutting of tires
Loess Overtill (Banked) Excellent for WTS: ripping may be required in dense material
Loess Overtill (Ripped) Excellent WTS material provided rock size does not exceed 610 mm (24")
Aridisols Excellent WTS material, ripping will decrease load times
Glacial Outwash/River Rock
Excellent WTS material provided rock size does not exceed 610 mm (24")
FOR MORE INFORMATION ON WHEEL TRACTOR-SCRAPER MATERIAL APPLICATIONS REFERENCE PUBLICATION AEXQ0442.
Push-Load TTT Match D8 D9 D10 D11
621
627
631
637
657
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Edition 44 24-11
Wheel Tractor-Scrapers
24
Tire Specifications
MODEL TIRE SIZE
PLY RATING/STAR RATING* TYPE
621K ★★ E-3
623K33.25R29◀ ★★ E-3
33.25-29 32 E-3
627K33.25R29◀ ★★ E-3
MODEL TIRE SIZE
PLY RATING/STAR RATING* TYPE
631G637G
37.25R35◀ ★★ E-3
657G40.5/75R39◀ ★★ E-3
* Manufacturer uses star (★) rating system instead of ply rating. ◀ Recommended tire.
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24-12 Edition 44
Wheel Tractor-Scrapers Cushion HitchWheel Tractor-Scraper Anatomy
CUSHION HITCH● Cushion Hitch dampens shocks to provide a smoother ride● Nitrogen over oil accumulators absorb and dampen road shock
1. Load Cylinder2. Hitch Castings3. Scraper Gooseneck4. Nitrogen Accumulators5. Orifice6. Oil from Tractor Hydraulic System7. Leveling Valve8. Free-Floating Pistons
WHEEL TRACTOR-SCRAPER ANATOMY
Push/Pull Bail
Cushion HitchGooseneck
Apron Router BitPush BlockCutting Edge
Steering Cylinders
Cushion Push Plate
Banana Link
Bowl Lift Cylinders
Overflow Guard
Ejector
Draft Arms
Bowl
Fuel Tank
Push/Pull Hook
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Edition 44 24-13
Wheel Tractor-ScrapersRimpull-Speed-Gradeability Curves● Example
USE OF RIMPULL-SPEED-GRADEABILITY CURVES
The following explanation applies to Rimpull-Speed-Gradeability curves for Wheel Tractor-Scrapers, Construc-tion & Mining Trucks/Tractors and Artic ulated Trucks.
Maximum speed attainable, gear range and available rimpull can be determined from curves on the following pages when machine weight and total effective grade (or total resistance) are known.Rimpull is the force (in kg, lb or kN) available between
the tire and the ground to propel the machine (limited by traction).
Weight is defined as Gross Machine Weight (kg or lb) = Machine + Payload.
Total Effective Grade (or Total Resistance) is grade resistance plus rolling resistance expressed as percent grade.Grade is measured or estimated.Rolling resistance is estimated (see Tables section for
typical values.)10 kg/metric ton (20 lb/U.S. ton) = 1% adverse grade.
Example
With a 6% grade and a rolling resistance of 40 kg/metric ton (80 lb/U.S. ton), find total resistance.Rolling resistance = 40 kg/t ÷ 10 = 4% Effective Grade (English: 80 lb ÷ 20 = 4%)Total resistance = 4% rolling + 6% grade = 10%
Altitude DeratingRimpull force and speed must be derated for alti-
tude similar to flywheel horsepower. The percentage loss in rimpull force approximately corresponds to the percentage loss in flywheel horsepower. See Tables Section for altitude derations.
Rimpull-Speed-GradeabilityTo determine gradeability performance: Read from
gross weight down to the % of total resistance. (Total resistance equals actual % grade plus 1% for each 10 kg/metric ton (20 lb./U.S. ton) of rolling resistance.) From this weight-resistance point, read horizontally to the curve with the highest obtainable speed range, then down to the maximum speed. Usable rimpull depends upon traction and weight on drive wheels.
Example problem:
A 631G with an estimated payload of 37 013 kg (81,600 lb) is operating on a total effective grade of 10%. Find the available rimpull and maximum attain-able speed.
Empty weight payload = Gross Weight47 628 kg + 37 013 kg = 84 641 kg(105,002 lb + 81,600 lb = 186,602 lb)
Solution: Using graph on the next page, read from 84 641 kg (186,602 lb) (point A) on top of gross weight scale down the line to the intersection of the 10% total resistance line (point B).
Go across horizontally from B to the Rimpull Scale on the left (point D). This gives the required rimpull: 7756 kg (17,100 lb).
Where the line cuts the speed curve (point C), read down vertically (point E) to obtain the maximum speed attainable for the 10% effective grade: 12.9 km/h (8 mph).
ANSWER: The machine will climb the 10% effective grade at a maximum speed of 12.9 km/h (8 mph) in 4th gear. Available rimpull is 7756 kg (17,100 lb).
● ● ●
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KEY
1 — 1st Gear Torque Converter Drive2 — 2nd Gear Torque Converter Drive3 — 3rd Gear Direct Drive4 — 4th Gear Direct Drive5 — 5th Gear Direct Drive6 — 6th Gear Direct Drive7 — 7th Gear Direct Drive8 — 8th Gear Direct Drive
KEY
A — Loaded 84 641 kg (186,602 lb)B — Intersection with 10% total resistance lineC — Intersection with rimpull curve (4th gear)D — Required rimpull 7756 kg (17,100 lb)E — Speed 12.9 km/h (8 mph)
GROSS WEIGHT
24-14 Edition 44
Wheel Tractor-Scrapers Rimpull-Speed-Gradeability Curves● Example
GROSS WEIGHT
kg x 1000
lb x 1000
TOTA
L R
ES
ISTA
NC
E(G
rad
e p
lus
Ro
llin
g)
SPEED
RIM
PU
LL
km/h
mph
lb x 1000
kg x 1000
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24
Edition 44 24-15
Wheel Tractor-ScrapersTypical Fixed TimesRetarder Curves
TYPICAL FIXED TIMES FOR SCRAPERS(Times may vary depending on job conditions)
Model Loaded ByLoad Time
(Min.)
Maneuver and Spread or
Maneuver and Dump (Min.)
613G Self 0.9 0.7
623K Self 0.9 0.7
621K One D8 0.5 0.7
627K One D8 0.5 0.6
621K One D9 0.4 0.7
627K One D9 0.4 0.6
627K/PP Self 0.9* 0.6
631G One D9 0.6 0.7
637G One D9 0.6 0.6
631G One D10 0.5 0.7
637G One D10 0.5 0.6
637G/PP Self 1.0* 0.6
657G One D11 0.6 0.6
657G Push Pull Self
1.1* 0.6
627G Auger 0.7 0.7
637G Auger 0.8 0.7
637G Coal 0.8 0.7
657G Auger 1.0 0.6
657G Coal 0.8 0.6
*Load time per pair, including transfer time.
NOTE: Empty Weights shown on the Wheel Tractor-Scraper charts includes ROPS Canopy. The travel times will remain within acceptable limits when applied to a non-ROPS equipped machine. When calculating TMPH loadings any addi-tional weight must be considered in establishing mean tire loads.
USE OF RETARDER CURVES
The following explanation applies to retarder curves for Wheel Tractor-Scrapers and Articulated Trucks.
The speed that can be maintained (without use of service brake) when the machine is descending a grade with retarder fully on can be determined from the retarder curves in this section if gross machine weight and total effective grade are known.Total Effective Grade (or Total Resistance) is grade assistance minus rolling resistance.
10 kg/metric ton (20 lb/U.S. ton) = 1% adverse grade.
Example
15% favorable grade with 5% rolling resistance. Find Total Effective Grade.
Total Effective Grade = 15% Grade Assistance — 5%
Rolling Resistance = 10% Total Effective Grade Assistance.
Example problem:
A 651E with an estimated payload of 47 175 kg (104,000 lb) descends a 10% total effective grade. Find constant speed and gear range with maximum retarder effort. Find travel time if the slope is 610 m (2000 ft) long.
Empty Weight + Payload = Gross Weight= 60 950 kg + 47 175 kg = 108 125 kg(134,370 lb + 104,000 lb = 238,370 lb)
PHB-Sec24-14.indd 15PHB-Sec24-14.indd 15 12/20/13 9:09 AM12/20/13 9:09 AM
24-16 Edition 44
Wheel Tractor-Scrapers Retarder Curves● Example
Solution: Using the retarder curve below, read from 108 125 kg (238,370 lb) (point A) on top of gross weight scale down the line to the intersection of the 10% effective grade line (point B).
Go across horizontally from point B to the inter-section of the retarder curve (point C). Point C inter-sects at the 5 (5th gear) range.
Where point C intersects the retarder curve, read down vertically to point D on the bottom scale to obtain the constant speed: 21.7 km/h (13.5 mph).
ANSWER: The 651E will descend the slope at 21.7 km/h (13.5 mph) in 5th gear. Travel time is 1.68 minutes.
610 m __________ = 1.68 min 363 m/min
*(mph × 88 = F.P.M.) 2000 ft _______________ = 1.68 min 13.5 mph × 88*
NOTE: The basic Distance-Speed-Time formula is 60 D ÷ S = T (or “60 D Street”), where 60 is minutes, D is distance, S is speed and T is time. In the above problem, 60 × 610 m ÷ 21.7 km/h × 1000 = T.
60 × 610 ____________ = T = (1.68) 21.7 × 1000
KEY
3 — 3rd Gear Direct Drive4 — 4th Gear Direct Drive5 — 5th Gear Direct Drive6 — 6th Gear Direct Drive7 — 7th Gear Direct Drive8 — 8th Gear Direct Drive
KEY
A — Loaded 108 125 kg (238,370 lb)B — Intersection with 10% effective grade lineC — Intersection with retarder curve (5th gear)D — Constant speed 21.7 km/h (13.5 mph)
GROSS WEIGHT
kg x 1000
lb x 1000
EFF
EC
TIV
E G
RA
DE
(Gra
de
min
us
Ro
llin
g R
esis
tan
ce)
SPEED
km/h
mph
PHB-Sec24-14.indd 16PHB-Sec24-14.indd 16 12/20/13 9:09 AM12/20/13 9:09 AM
24
Edition 44 24-17
Wheel Tractor-Scrapers621K Rimpull-Speed-Gradeability● 33.25R29 Tires
*at sea level
KEY
1 — 1st Gear Torque Converter Drive2 — 2nd Gear Torque Converter Drive3 — 3rd Gear Direct Drive4 — 4th Gear Direct Drive5 — 5th Gear Direct Drive6 — 6th Gear Direct Drive7 — 7th Gear Direct Drive8 — 8th Gear Direct Drive
KEY
E — Empty 36 185 kg (79,787 lb)L — Loaded 62 312 kg (137,397 lb)
0 5 10 15 20 25 30 35 40 45 50 55
5
10
15
20
25
30
35
40
45
500 10 20 30 40 50 60 70 80
LE
0 20 40 60 80 100 120 140 160
0 5 10 15 20 25 30
10
20
30
40
50
60
70
80
90
100
110
87654
32
1
5%
25%
30%
20%
15%
10%
kg x 1000
lb x 1000
TOTA
L R
ES
ISTA
NC
E(G
rad
e p
lus
Ro
llin
g)
SPEED
RIM
PU
LL
km/h
mph
lb x 1000
kg x 1000
STANDARD ARRANGEMENT*GROSS WEIGHT
PHB-Sec24-14.indd 17PHB-Sec24-14.indd 17 12/20/13 9:09 AM12/20/13 9:09 AM
24-18 Edition 44
Wheel Tractor-Scrapers 621K Retarding● 33.25R29 Tires
0
0
87 5%
25%LE
6
5
4
3
30%
20%
15%
10%
0
10
20
20
40
30
60
40
80
50
100 110
60
120
70
160
80
0
5
5
10
10
15 20 25 30 35 40 45 50 55 60
20 25 30 3515
GROSS WEIGHT
KEY
3 — 3rd Gear Direct Drive4 — 4th Gear Direct Drive5 — 5th Gear Direct Drive6 — 6th Gear Direct Drive7 — 7th Gear Direct Drive8 — 8th Gear Direct Drive
KEY
E — Empty 36 185 kg (79,787 lb)L — Loaded 62 312 kg (137,397 lb)
kg x 1000
lb x 1000
EFF
EC
TIV
E G
RA
DE
(Gra
de
min
us
Ro
llin
g R
esis
tan
ce)
SPEED
km/h
mph
*at sea level
high
medium
Co
mp
ress
ion
Bra
kin
g L
evel
low
PHB-Sec24-14.indd 18PHB-Sec24-14.indd 18 12/20/13 9:09 AM12/20/13 9:09 AM
24
Edition 44 24-19
Wheel Tractor-Scrapers623K Rimpull-Speed-Gradeability● 33.25R29 Tires
KEY
1 — 1st Gear Torque Converter Drive2 — 2nd Gear Torque Converter Drive3 — 3rd Gear Direct Drive4 — 4th Gear Direct Drive5 — 5th Gear Direct Drive6 — 6th Gear Direct Drive7 — 7th Gear Direct Drive8 — 8th Gear Direct Drive
KEY
E — Empty 39 937 kg (88,061 lb)L — Loaded 64 975 kg (143,261 lb)
0 5 10 15 20 25 30 35 40 45 50 55
0 10 20 30 40 50 60 70 80
0 20 40 60 80 100 120 140 160
0 5 10 15 20 25 30
10
20
30
40
50
60
70
80
90
100
110
5
10
15
20
25
30
35
40
45
50
8765
43
2
1
5%
25%
30%
20%
15%
10%
LE
kg x 1000
lb x 1000
TOTA
L R
ES
ISTA
NC
E(G
rad
e p
lus
Ro
llin
g)
SPEED
RIM
PU
LL
km/h
mph
lb x 1000
kg x 1000
GROSS WEIGHT
PHB-Sec24-14.indd 19PHB-Sec24-14.indd 19 12/20/13 9:09 AM12/20/13 9:09 AM
24-20 Edition 44
Wheel Tractor-Scrapers 623K Retarding● 33.25R29 Tires
LE
0
0
5
5
10
10
15
15
20
20
25
25
30 35 40 45 50 55 60
3530
5%
25%
30%
20%
15%
10%
0
0
10
20
20
40
30
60
40
80
50
100
60
120
70
140
80
160
87
6
5
4
3
GROSS WEIGHT
KEY
3 — 3rd Gear Direct Drive4 — 4th Gear Direct Drive5 — 5th Gear Direct Drive6 — 6th Gear Direct Drive7 — 7th Gear Direct Drive8 — 8th Gear Direct Drive
KEY
E — Empty 39 937 kg (88,061 lb)L — Loaded 64 975 kg (143,261 lb)
kg x 1000
lb x 1000
EFF
EC
TIV
E G
RA
DE
(Gra
de
min
us
Ro
llin
g R
esis
tan
ce)
SPEED
km/h
mph
high
medium
Co
mp
ress
ion
Bra
kin
g L
evel
low
PHB-Sec24-14.indd 20PHB-Sec24-14.indd 20 12/20/13 9:09 AM12/20/13 9:09 AM
24
Edition 44 24-21
Wheel Tractor-Scrapers627K Rimpull-Speed-Gradeability● 33.25R29 Tires
*at sea level
KEY
1 — 1st Gear Torque Converter Drive2 — 2nd Gear Torque Converter Drive3 — 3rd Gear Direct Drive4 — 4th Gear Direct Drive5 — 5th Gear Direct Drive6 — 6th Gear Direct Drive7 — 7th Gear Direct Drive8 — 8th Gear Direct Drive
KEY
E — Empty 40 913 kg (90,213 lb)L — Loaded 67 040 kg (147,823 lb)
5%
25%
LE
30%
20% 15% 10%
0 5 10 15 20 25 30 35 40 45 50 55
0 5 10 15 20 25 30
0 10 20 30 40 50 60 70 80
0 20 40 60 80 100 120 140 160
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
5
10
15
20
25
30
35
40
45
55
60
65
70
50
8765
43
2
1
kg x 1000
lb x 1000
TOTA
L R
ES
ISTA
NC
E(G
rad
e p
lus
Ro
llin
g)
SPEED
RIM
PU
LL
km/h
mph
lb x 1000
kg x 1000
STANDARD ARRANGEMENT*GROSS WEIGHT
PHB-Sec24-14.indd 21PHB-Sec24-14.indd 21 12/20/13 9:09 AM12/20/13 9:09 AM
24-22 Edition 44
Wheel Tractor-Scrapers 627K Retarding● 33.25R29 Tires
0 5 10 15 20 25 30 35 40 45 50 55 60
0 10 20 30 40 50 60 70 80
87 5%
25%LE
6
5
4
3
30%
20%
15%
10%
0 20 40 60 80 100 120 140 160
0 5 10 15 20 25 30 35
GROSS WEIGHT
KEY
3 — 3rd Gear Direct Drive4 — 4th Gear Direct Drive5 — 5th Gear Direct Drive6 — 6th Gear Direct Drive7 — 7th Gear Direct Drive8 — 8th Gear Direct Drive
KEY
E — Empty 40 913 kg (90,213 lb)L — Loaded 67 040 kg (147,823 lb)
kg x 1000
lb x 1000
EFF
EC
TIV
E G
RA
DE
(Gra
de
min
us
Ro
llin
g R
esis
tan
ce)
SPEED
km/h
high
medium
Co
mp
ress
ion
Bra
kin
g L
evel
low
mph
*at sea level
PHB-Sec24-14.indd 22PHB-Sec24-14.indd 22 12/20/13 9:09 AM12/20/13 9:09 AM
24
Edition 44 24-23
Wheel Tractor-Scrapers631G Rimpull-Speed-Gradeability● 37.25R35 Tires
GROSS WEIGHT
KEY
1 — 1st Gear Torque Converter Drive2 — 2nd Gear Torque Converter Drive3 — 3rd Gear Direct Drive4 — 4th Gear Direct Drive5 — 5th Gear Direct Drive6 — 6th Gear Direct Drive7 — 7th Gear Direct Drive8 — 8th Gear Direct Drive
KEY
E — Empty 47 628 kg (105,002 lb)L — Loaded 84 641 kg (186,602 lb)
lb x 1000
kg x 1000
TOTA
L R
ES
ISTA
NC
E(G
rad
e p
lus
Ro
llin
g)
SPEED
RIM
PU
LL
mph
km/h
kg x 1000
lb x 1000
0 5 10 15 20 25 30 35 40 45 50 55
30 40 50 60 80 100 120 160 200
655545
35
2520
15
108
6
4
2
1 2
5
10
15
20
30
4050
70
100120150
0 5 10 15 20 25 30 35
30%25%20%
15%12%10%8%
6%5%4%
3%
2%
605040302015 70 90
E L
1
2
3
45
67
8
PHB-Sec24-14.indd 23PHB-Sec24-14.indd 23 12/20/13 9:09 AM12/20/13 9:09 AM
24-24 Edition 44
Wheel Tractor-Scrapers 631G Retarding● 37.25R35 Tires
55 75 100 125 150 175
0 5 10 15 20 25 30 35 40 45 50 55 60
0 5 10 15 20 25 30 35
E L3
4
5
6
78
30 40 50 60 70 80
30%
22%
16%
10%
5%
1%
GROSS WEIGHT
KEY
3 — 3rd Gear Direct Drive4 — 4th Gear Direct Drive5 — 5th Gear Direct Drive6 — 6th Gear Direct Drive7 — 7th Gear Direct Drive8 — 8th Gear Direct Drive
KEY
E — Empty 47 628 kg (105,002 lb)L — Loaded 84 641 kg (186,602 lb)
lb x 1000
kg x 1000
EFF
EC
TIV
E G
RA
DE
(Gra
de
min
us
Ro
llin
g R
esis
tan
ce)
SPEED
mph
km/h
PHB-Sec24-14.indd 24PHB-Sec24-14.indd 24 12/20/13 9:09 AM12/20/13 9:09 AM
Edition 44 24-25
Wheel Tractor-Scrapers
24
Edition 44 24-25
637G Rimpull-Speed-Gradeability● 37.25R35 Tires
0 5 10 15 20 25 30 35 40 45 50 55
30 40 50 60 80 100 120 160 200
655545
35
2520
15
108
6
4
2
1 2
5
10
20
50
100
150
0 5 10 15 20 25 30 35
30%25%20%
15%12%10%8%
6%5%4%
3%
2%
605040302015 70 90
15
30
40
70
120 1
2
3
45
6
7
8
E L
GROSS WEIGHT
KEY
1 — 1st Gear Torque Converter Drive2 — 2nd Gear Torque Converter Drive3 — 3rd Gear Direct Drive4 — 4th Gear Direct Drive5 — 5th Gear Direct Drive6 — 6th Gear Direct Drive7 — 7th Gear Direct Drive8 — 8th Gear Direct Drive
KEY
E — Empty 54 057 kg (119,175 lb)L — Loaded 91 070 kg (200,775 lb)
lb x 1000
kg x 1000
TOTA
L R
ES
ISTA
NC
E(G
rad
e p
lus
Ro
llin
g)
SPEED
RIM
PU
LL
mph
km/h
kg x 1000
lb x 1000
PHB-Sec24-14.indd 25PHB-Sec24-14.indd 25 12/20/13 9:09 AM12/20/13 9:09 AM
24-26 Edition 44
Wheel Tractor-Scrapers
24-26 Edition 44
637G Retarding● 37.25R35 Tires
50 100 150 200 250 300
0 5 10 15 20 25 30 35 40 45 50 55 60
0 5 10 15 20 25 30 35
E
3 4
56
78
35 55 75 95 115 135
30%
25%
20%
15%
10%
1%
5%
L
GROSS WEIGHT
KEY
3 — 3rd Gear Direct Drive4 — 4th Gear Direct Drive5 — 5th Gear Direct Drive6 — 6th Gear Direct Drive7 — 7th Gear Direct Drive8 — 8th Gear Direct Drive
KEY
E — Empty 54 057 kg (119,175 lb)L — Loaded 91 070 kg (200,775 lb)
lb x 1000
kg x 1000
EFF
EC
TIV
E G
RA
DE
(Gra
de
min
us
Ro
llin
g R
esis
tan
ce)
SPEED
mph
km/h
PHB-Sec24-14.indd 26PHB-Sec24-14.indd 26 12/20/13 9:09 AM12/20/13 9:09 AM
Edition 44 24-27
Wheel Tractor-Scrapers
24
657G Rimpull-Speed-Gradeability● 37.25/R35 Tires
Edition 44 24-27
0 10 20 30 40 50 60
500
200 40 60 80 100 120 140
0
10
20
30
40
50
60
70
80
90
100
110
0
20
40
60
80
100
120
140
160
180
200
220
240
0 5
100 150 200 250 300
10 15 20 25 30 35
30%
35%
40%
25%
20%
15%
10%
5%
1
45
E L
23
6 7 8
GROSS WEIGHT*
KEY
1 — 1st Gear Torque Converter Drive2 — 2nd Gear Torque Converter Drive3 — 3rd Gear Direct Drive4 — 4th Gear Direct Drive5 — 5th Gear Direct Drive6 — 6th Gear Direct Drive7 — 7th Gear Direct Drive8 — 8th Gear Direct Drive
KEY
E — Empty 72 804 kg (160,505 lb)L — Loaded 119 978 kg (264,505 lb)
lb x 1000
kg x 1000
TOTA
L R
ES
ISTA
NC
E(G
rad
e p
lus
Ro
llin
g)
SPEED
RIM
PU
LL
mph
km/h
kg x 1000
lb x 1000
*at sea level
PHB-Sec24-14.indd 27PHB-Sec24-14.indd 27 12/20/13 9:09 AM12/20/13 9:09 AM
24-28 Edition 44
Wheel Tractor-Scrapers 657G Retarding● 37.25/R35 Tires
24-28 Edition 44
0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300
0 5 10 15 20 25 30 35 40 45 50
0 5 10 15 20 25 30
E L3
4
5
6
150 30 45 60 75 90 105 120 135
30%35%40%
25%
20%
15%
10%
1%
5%7
8
GROSS WEIGHT*
KEY
3 — 3rd Gear Direct Drive4 — 4th Gear Direct Drive5 — 5th Gear Direct Drive6 — 6th Gear Direct Drive7 — 7th Gear Direct Drive8 — 8th Gear Direct Drive
KEY
E — Empty 72 804 kg (160,505 lb)L — Loaded 119 978 kg (264,505 lb)
lb x 1000
kg x 1000
EFF
EC
TIV
E G
RA
DE
(Gra
de
min
us
Ro
llin
g R
esis
tan
ce)
SPEED
mph
km/h
*at sea level
PHB-Sec24-14.indd 28PHB-Sec24-14.indd 28 12/20/13 9:09 AM12/20/13 9:09 AM