Caterpillar Performance Handbook...**Standard Shipping Configuration. Operating weight includes standard machine, coolant, lubricants, full fuel tank, and operator. Operating weights

© 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

PHB-Sec24-14.indd 1PHB-Sec24-14.indd 1 12/20/13 9:09 AM12/20/13 9:09 AM

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


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


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


24

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


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.


24

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.


● Can be reversed or propellered for prolonged edge use and improved cost per hour.


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.


● 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.


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.


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


Edition 44 24-11


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.


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


24

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).

● ● ●


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


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)


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


24

Edition 44 24-17

Wheel Tractor-Scrapers621K Rimpull-Speed-Gradeability● 33.25R29 Tires

*at sea level

KEY


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


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


KEY


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


24

Edition 44 24-19


KEY


KEY


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


24-20 Edition 44


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


KEY


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


24

Edition 44 24-21


*at sea level

KEY


KEY


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


24-22 Edition 44


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


KEY


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


24

Edition 44 24-23

Wheel Tractor-Scrapers631G Rimpull-Speed-Gradeability● 37.25R35 Tires

GROSS WEIGHT

KEY


KEY


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


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


KEY


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


Edition 44 24-25


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


KEY


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


24-26 Edition 44


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


KEY


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


Edition 44 24-27


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


KEY


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


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


KEY


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


Documents

Caterpillar Performance Handbook...**Standard Shipping Configuration. Operating weight includes standard machine, coolant, lubricants, full fuel tank, and operator. Operating weights