621G 623G 627G Open Bowl Auger Elevator Open Bowl Auger Cat ® 3406E Net Power 246/272 kW 246/272 kW 246/272 kW 246/272 kW 246/272 kW (330/365 hp) (330/365 hp) (330/365 hp) (330/365 hp) (330/365 hp) Cat ® 3306 Net Power — — — 168kW 168 kW (225 hp) (225 hp) Heaped capacity, SAE rated 15.3 m 3 15.3 m 3 17.6 m 3 15.3 m 3 15.3 m 3 (20 yd 3 ) (20 yd 3 ) (23 yd 3 ) (20 yd 3 ) (20 yd 3 ) Rated load 21 800 kg 21 800 kg 24 948 kg 21 800 kg 21 800 kg (48,000 lb) (48,000 lb) (55,000 lb) (48,000 lb) (48,000 lb) ® 621G, 623G, 627G Wheel Tractor- Scrapers
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Wheel Tractor Scrapers - AEHQ5412 - Kelly Tractor Co. · PDF fileCaterpillar Scraper bowls are designed to provide fast cycle times for high productivity. pg. 5 Cushion Hitch ... Caterpillar
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621G 623G 627GOpen Bowl Auger Elevator Open Bowl Auger
621G, 623G, 627G ScrapersHighly productive earthmoving machines, built to last.
Push-Pull Arrangement
Designed for maximum productivitywhile providing the flexibility for self-loading, push-pull loading or standardpush loading.pg. 9
Elevator Arrangement
Provides true self-loading capability.Infinitely variable forward and reversespeeds match loading speed to material.Well suited for production as well asfinish work.pg. 10
Scraper Bowl
Caterpillar Scraper bowls are designedto provide fast cycle times for highproductivity.pg. 5
engines and automatic planetarypowershift transmissions areelectronically integrated to providemaximum power to the cutting edge andexceptional haul road speed.pg. 4
3
Serviceability & Complete CustomerSupport
Designed for easy maintenance andrepair, the new G-Series machines arebacked by total Caterpillarcommittment to customer support.pgs. 12, 13
Auger Arrangement
Provides self-loading capability withthe same wide material appetite as anopen bowl machine. pg. 11
Open Bowl Arrangement
Provides aggressive materialpenetration for traditional push-loadingapplications.pg. 8
Operator Station
Convenient control placement and acomfortable work environment are keysto high productivity. Features includeelectro-hydraulic controls, a new airseat suspension and improvedinstrumentation.pg. 6
Enhanced Control Layout
Three implement levers have beencombined into a simple and easy tooperate joystick, enhancing theproductivity of experienced andinexperienced operators alike.pg. 7
4
Electronic Control Throttle Shifting(CTS). Automatically synchronizesengine speed to transmission speedduring shifting to reduce power trainstress and increase component life.
Transmission Hold Switch. Allows theoperator to maintain converter drive infirst and second gear for increasedrimpull, or hold the current gear forenhanced control.
Programmable Top Gear Selection.Provides improved flexibility to matchthe hauling speed of the fleet to specificjob site speeds.
Power TrainProven components are electronically integrated to achieve new levels of performance andefficiency.
3406E Engine. The six-cylinder,turbocharged, electronically controlledengine is built for power, reliability, andeconomy.
Electronic Controls. The ElectronicControl Module (ECM) responds tooperator commands and engine sensorinput to optimize engine and machineperformance.
High Torque Rise. Provides increasedpower in the cut.
Dual Horsepower. Provides increasedpower during operation of the auger orelevator mechanisms. It also providesincreased power when the machine isoperating in the higher gear ranges forenhanced haul road speed.
Transmission. Electronically controlledCaterpillar planetary powershifttransmission with eight forward and onereverse speed. Gears one and twooperate in converter drive for increasedtorque capability during the cut and fill.Gears three through eight operate indirect-drive for drive train efficiencyduring the haul. Reverse operates inconverter drive.
5
Cushion HitchDelivers a smoother ride for enhanced operator comfort.
Parallelogram-Type Linkage. Theelectronically actuated cushion hitchincorporates a parallelogram-typelinkage for exceptional strength.
Lockout Switch. Improves control ofthe cutting edge during loading anddumping.
Scraper BowlDesigned for optimum loading, material retention and ejection.
Low Profile Design. Offers lessresistance to incoming material whichallows the load to build quickly.
Bulldozer Ejection System. Providesquick material ejection and reducedcarry-back for increased productivity.
Ground Engaging Tools.• Cutting edges are reversible to helpprovide long life. Different thicknessesare available for different applications.For optimal performance use thethinnest edge that provides satisfactorywear life and impact resistance.
• Optional teeth are available in severaldifferent configurations that canpenetrate material better than a cuttingedge without teeth.
Sound Suppression. Sound suppressed,rubber mounted ROPS cab reducessound and vibration for comfort.
Steering Column. Redesigned toincrease operator legroom by 11percent.
Instrumentation:Quad Gauge Cluster. Provides fluidlevel and temperature information at aglance.
Electronic Speedometer/Tachometerprovides actual gear indication readout.
Electronic Monitoring System (EMS II)monitors machine status and providesreal time information to the operator.
Switch Console. Provides enhancedvisibility and convenience by movingthe less frequently used switches to theheadliner.
Seat. The new Cat Comfort Cloth Seatoffers improved comfort with a newlydesigned air seat suspension.
• Swivels and locks in four positions (0to 30 degrees) to ensure properorientation of the operator to thejoystick.
• Fore/aft and vertical height adjustmentto accommodate various sizedoperators.
Air Conditioning. Now standard.Improved ventilation enhances airflowin the cab.
Storage and Amenities. Convenientstorage compartments include space fora lunch box and first aid kit. Alsofeatures a cup holder and ashtray.
Operator StationRedesigned for enhanced operator comfort and productivity.
6
7
Joystick Control. Simple and easy tooperate, enhancing the productivity ofoperators of all skill levels. Requires 25percent less force to control the criticalscraper functions and requires 40percent less stick movement thanbefore.
Transmission Control. Simplifies gearselection and provides operator-definedtop gear control.
Joystick Functions.• Forward/Reverse - Bowl raise/lowerand quick drop
• Left/Right - Ejector direction
• Thumb Rocker - Apron position(621G/627G only), Elevator speed anddirection (623G only)
• Trigger Switch - Auger on/off(621G/627G only), Set elevator speed(623G only), Bail up/down (627G only)
• Thumb Switches - Transmission holdand cushion hitch controls
Enhanced Control LayoutFeatures an electro-hydraulic implement control and electronic gear selector for increasedoperator efficiency.
8
Material Application. Well suited tohandle a wide variety of material fromclay to shot rock.
Push-Loading. To achieve maximumproductivity, the 621G and 627G shouldbe push loaded by either a D8R or D9RTrack-Type Tractor.
Tandem Engine. Provides the ability tohandle steep grades as well as all wheeldrive to handle soft, slippery underfootconditions.
Dual Horsepower. Provides increasedhorsepower during the haul whichresults in faster cycle times.
Open Bowl (621G/627G only)Highly productive earthmoving machines, built to last.
9
Material Application. Well suited tohandle a wide variety of material.
Push-Loading. Working together, push-pull scrapers combine to place over1000 horsepower on a single cuttingedge. Fast loading means short cycletimes.
Tandem Engine. Provides the ability tohandle steep grades as well as all wheeldrive to handle soft, slippery underfootconditions.
Dual Horsepower. Provides increasedhorsepower during the haul whichresults in faster cycle times.
Maximum Productivity. Push-pullscrapers can provide the lowest cost-per-yard for any scraper application.
Push-Pull Arrangement (627G only)Wide material appetite with high production capability.
10
Material Application. Work alonecapability makes it ideal for picking upwindrows, soil mixing, as well ascleanup and production work.Conditions material which promotescompaction in the fill.
Elevator Mechanism. The elevator liftsmaterial off of the cutting edge andcarries it to the top of the load for trueself-loading capability.
Single Pivot Design. Enhances materialloading and improves the load profile toconsistently achieve capacity loads.
Elevator. Infinitely variable speedelevator allows the operator to matchthe elevator speed to the material. Highspeed loading is available for normalconditions and windrows; low speed fortough materials.
Reverse Function. The elevator reversesfor spreading top soil and unloadingcohesive material and blendingwindrowed material.
Hydraulic Chain Adjuster simplifieschain adjustment which is critical toachieving long chain life.
Dual Horsepower. The dual horsepowerprovides increased horsepower to theelevator during loading and unloadingfor enhanced performance.
Elevator (623G only)Work-alone capability reduces the operating cost-per-ton.
Material Application. Work alonecapability with a wide material appetiteranging from overburden to laminatedrock. Conditions material whichpromotes compaction in the fill andsignificantly reduces dust duringloading.
Auger Mechanism. The auger liftsmaterial off of the cutting edge andcarries it to the top of the load for trueself-loading capability. Material isdistributed evenly throughout the bowl,resulting in consistent loads.
Dual Horsepower. Provides increasedpower to the auger for improvedloading performance.
Slip Limiter Switch. Prevents rear wheelslip during loading.
Apron. Prevents material spillage andretains fine material far better than anelevating scraper.
Auger Arrangement (621G/627G only)Excellent self-loading capability in a wide range of material.
11
12
Service Points. Service points for theengine are grouped on the right-handside for easy access.
Hydraulic Chain Adjuster. Easilyadjusted using a grease gun, reducingservice time and improving overallchain life.
Wiring Harness. Incorporates color-coded and numbered circuits for quickidentification and simplifiedtroubleshooting.
Cantilever Wheels. Provide greaterparts commonality and ease ofserviceability to the wheels and brakes.
Electronic Monitoring System (EMS II).Monitors machine status and providesreal-time information to the operatorincluding warnings of problemsidentified by the Electronic ControlModules.
Convenient Diagnostic Connections.Allow quick trouble-shooting using theElectronic Technician (ET) service tool.Cat Electronic Technician softwarerunning on a laptop computer providesenhanced diagnostic capability fortroubleshooting. Electronic Technicianalso provides cylinder cut-out tests andother testing capabilities.
ServiceabilitySimplified service means more productive uptime.
13
Parts Availability. Most Cat parts areimmediately available from any dealer.Cat dealers rely on our worldwidecomputer network to find parts instantlyand minimize machine downtime. Manycomponents are economically availableas Caterpillar RemanufacturedProducts.
Machine Management Services. Catdealers help manage your equipmentinvestment with:
• Effective preventive maintenanceprograms.
• Diagnostic programs such asScheduled Oil Sampling (S•O•S) andTechnical Analysis.
• Information to make the most cost-effective repair option decisions.
• Customer meetings; training foroperators and mechanics.
Flexible Financing. Your dealer canarrange affordable financing for theentire Caterpillar product line. Talk toyour dealer to learn how terms can bestructured to meet your cash flowrequirements.
Complete Customer SupportUnmatched in the industry!
14 621G/623G/627G Scrapers specifications
EnginesAll Caterpillar engines are built to excel in even the most demanding jobs.
Features ■ fuel system (3406E) delivers fuel
economy through mechanicallyactuated, electronically controlledunit injectors
■ electronic control provides precisespeed governing, active and loggeddiagnostic codes, cold start-up mode,low oil pressure warning/derate andhigh temperature warning/derate
■ direct-injection fuel system (3306 —627G Scraper engine) with individualadjustment-free injection pumpsandvalves
■ integral inlet manifold porting withtwo intake and two exhaust valves percylinder with valve rotators or 3406Eand one intake and one exhaust valveper cylinder on 3306
■ cam-ground and tapered aluminum-alloy pistons with three keystone-designed rings; cooled by oil spray
BrakesMeet the following standards: OSHA,MSHA, ISO 3450: 1998.
Service brake features■ air-applied, spring-released■ cam-operated, expanding-shoe type
Parking brake features■ uses service brakes which are spring-
applied, air-released■ manually applied park brake switch
can be applied with button on dash
Secondary brake features■ uses single axle service brakes which
are air-applied, spring-released■ automatically applied if service air
pressure drops to 380 kPa (55 psi)■ audible and visual action alert
indicators inform operator whenservice air pressure drops to 518 kPa(75 psi)
CabCaterpillar cab and Rollover ProtectiveStructure (ROPS) are standard in NorthAmerica, Europe and Japan.
Features■ meets OSHA and MSHA limits for
operator sound exposure with doorsand windows closed (according toANSI/SAE J1166 MAY90)
■ ROPS meets the following criteria:SAE J320aSAE J1040 MAY94ISO 3471-1986, ISO 3471-1994
■ also meets the following criteria forFalling Objects Protective Structure:SAE J231 JAN81ISO 3449-1992
Note:When properly installed and maintained,the cab offered by Caterpillar, whentested with doors and windows closedaccording to ANSI/SAE J1166 MAY90,meets OSHA and MSHA requirementsfor operator sound exposure limits ineffect at time of manufacture. Theoperator sound pressure level is less than81dB(A) when measured per ISO 6394or 86/662/EEC.
17621G/623G/627G Scrapers specifications
Elevator (623G only)Infinitely variable, forward and reverse,to a loaded maximum of 82 m/min (268 fpm).
Length (overall) 3730 mm 12'3"
Width of flight face 217 mm 8.5"
Length of flights 2260 mm 7'5"
Spacing of flights 510 mm 20"
Number of flights 15
Features■ single pivot linkage on elevator frame■ hydraulic chain adjuster■ hydraulically driven through 48.4:1
planetary gear reduction box■ split construction drive sprockets■ adjustable chain with heat-treated
■ elevator — infinitely variable forwardand reverse (623G only)
■ apron — raise, hold, lower and float(621G, 627G)
Tires
Manufacturer Tire Size
Michelin 33.25R29 MX XRB**E3
Goodyear 33.25-29 HRL 32PR E3
Michelin 29.5R29 MX XRB**E3
Goodyear 29.5R29 RL2F4S* E2
Goodyear 29.5-29 SGL 34PR E2
Bridgestone/Firestone 33.25R29 VRL**E3
Goodyear 33.25R29 RT3A4S**E3
Note:In certain applications the scraper’sproductive capabilities might exceed thetires’ tonnes-km/h (ton-mph) capabilities.Caterpillar recommends that you consulta tire supplier to evaluate all conditionsbefore selecting optional tires.
Model 621G* 623G 627G* 627GStandard Push-pull
Shipping, with ROPS cab and 10% fuel
Tractor 69% 65% 59% 61%
21 833 kg 48,133 lb 23 735 kg 52,328 lb 21 532 kg 47,470 lb 22,894 kg 50,473 lb
Scraper 31% 35% 41% 39%
9809 kg 21,625 lb 12 781 kg 28,176 lb 14 963 kg 32,988 lb 14 637 kg 32,270 lb
Total 100% 31 642 kg 69,758 lb 36 516 kg 80,504 lb 36 495 kg 80,458 lb 37 532 kg 82,743 lbOperating empty, with ROPS cab,
full fuel tanks and operator
Front axle 68% 64% 59% 60%
21 968 kg 48,341 lb 23 795 kg 52,460 lb 21 888 kg 48,256 lb 23,020 kg 50,750 lb
Rear axle 32% 36% 41% 40%
10 319 kg 22,749 lb 13 327 kg 29,380 lb 15 211 kg 33,534 lb 15 114 kg 33,320 lb
Total 100% 32 247 kg 71,090 lb 37 122 kg 81,840 lb 37 099 kg 81,790 lb 38 136 kg 84,075 lbLoaded, based on a rated load of: 21 800 kg 48,000 lb 25 000 kg 55,000 lb 21 800 kg 48,000 lb 21 800 kg 48,000 lb
Front axle 53% 50% 48% 49%
28 630 kg 63,118 lb 30 901 kg 68,125 lb 28 258 kg 62,299 lb 29 355 kg 64,717 lb
Rear axle 47% 50% 52% 51%
25 388 kg 55,972 lb 30 901 kg 68,125 lb 30 613 kg 67,491 lb 30 553 kg 67,358 lb
Total 100% 54 018 kg 119,090 lb 61 802 kg 136,250 lb 58 871 kg 129,790 lb 59 908 kg 132,075 lb
*Auger adds approximately 4536 kg (10,000 lb) to total weight.
Weights (approximate)
18 621G/623G/627G Scrapers specifications
HydraulicsClosed, full-flow filtered hydraulic circuits powered by vane-type and piston-type pumps.
Model 621G 623G 627GDouble acting bowl cylinders (2)
Dimensions: bore 152 mm 6" 152 mm 6" 152 mm 6"
stroke 813 mm 32" 508 mm 20" 813 mm 32"
Double acting apron (floor on 623G) cylinder (1)
Dimensions: bore 184 mm 7.25" 152 mm 6" 184 mm 7.25"
stroke 600 mm 24" 1353 mm 53.25" 600 mm 24"
Double acting ejector cylinder (1)
Dimensions: bore 165 mm 6.5" 127 mm 5" 165 mm 6.5"
Steering, secondary 50 kg 110 lb 50 kg 110 lb 50 kg 110 lb
22 621G/623G/627G Scrapers specifications
Gradeability/Speed/Rimpull
To determine gradeability performance:Read from gross weight down to thepercent of total resistance. Totalresistance equals actual percent gradeplus 1% for each 9 kg/t (20 lb/ton) ofrolling resistance. From this weight-resistance point, read horizontally to thecurve with the highest obtainable gear,then down to maximum speed. Usablerimpull will depend upon tractionavailable and weight on drive wheels.
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70
0.6
0.8
1
2
4
6
8
10
20
40
60
80
100
10 20 40 60 80 100 200
km/h
mph
kg x 1000
lb x 1000lb x1000
kg x1000
30%25%
20%
15%
10%
8%
6%
4%
2%
0 5 10 15 20 25 30 35 40
1
2
4
6
8
10
20
40
60
80
100
200
4 6 8 10 20 40 60 80 100
Direct Drive
Torque Converter Drive
621G Gross Weight37.25-35 Tires
Speed
Tota
l Res
ista
nce
(Gra
de p
lus
Rolli
ng R
esis
tanc
e)
Rim
pull
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
E—Empty 32 247 kg (71,090 lb)
L—Loaded 54 018 kg (119,090 lb)
3rd Gear
1st Gear
2nd Gear
4th Gear
5th Gear6th Gear
7th Gear8th Gear
E L
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70
0.6
0.8
1
2
4
6
8
10
20
40
60
80
100
10 20 40 60 80 100 200
km/h
mph
kg x 1000
lb x 1000lb x1000
kg x1000
30%25%
20%
15%
10%
8%
6%
4%
2%
0 5 10 15 20 25 30 35 40
1
2
4
6
8
10
20
40
60
80
100
200
4 6 8 10 20 40 60 80 100
Direct Drive
Torque Converter Drive
627G Gross Weight37.25-35 Tires
Speed
Tota
l Res
ista
nce
(Gra
de p
lus
Rolli
ng R
esis
tanc
e)
Rim
pull
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
E—Empty 37 099 kg (81,790 lb)
L—Loaded 58 871 kg (129,790 lb)
3rd Gear
1st Gear
2nd Gear
4th Gear5th Gear
6th Gear7th Gear
8th Gear
E L
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70
0.6
0.8
1
2
4
6
8
10
20
40
60
80
100
10 20 40 60 80 100 200
km/h
mph
kg x 1000
lb x 1000lb x1000
kg x1000
30%25%
20%
15%
10%
8%
6%
4%
2%
0 5 10 15 20 25 30 35 40
1
2
4
6
8
10
20
40
60
80
100
200
4 6 8 10 20 40 60 80 100
Direct Drive
Torque Converter Drive
623G Gross Weight37.25-R35 Tires
Speed
Tota
l Res
ista
nce
(Gra
de p
lus
Rolli
ng R
esis
tanc
e)
Rim
pull
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
E—Empty 37 122 kg (81,840 lb)
L—Loaded 61 802 kg (136,250 lb)
3rd Gear
1st Gear
2nd Gear
4th Gear
5th Gear6th Gear
7th Gear8th Gear
E L
23621G/623G/627G Scrapers specifications
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 km/h
mph
kg x 1000
lb x 1000
1%
25%
5%
10%
15%
20%
0 10 20 30 40 50 60 70 80
0 20 40 60 80 100 120 140 160 180
0 5 10 15 20 25 30
Retarding
To determine retarding performance:Read from gross weight down to thepercent effective grade. (Effective gradeequals actual percent grade minus 1%for each 9 kg/t (20 lb/ton) of rollingresistance). From this weight-effectivegrade point, read horizontally to thecurve with the highest obtainable speedrange, then down to maximum descentspeed the retarder can properly handle.
621G RetardingGross Weight
Speed
Effe
ctiv
e G
rade
(Fav
orab
le)
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
E—Empty 32 247 kg (71,090 lb)
L—Loaded 54 018 kg (119,090 lb)
3rd Gear
4th Gear
5th Gear
6th Gear7th Gear
8th Gear
E L
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 km/h
mph
kg x 1000
lb x 1000
1%
25%
5%
10%
15%
20%
30%
0 10 20 30 40 50 60 70 80
0 20 40 60 80 100 120 140 160 180
0 5 10 15 20 25 30
627G RetardingGross Weight
Speed
Effe
ctiv
e G
rade
(Fav
orab
le)
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
E—Empty 37 099 kg (81,790 lb)
L—Loaded 58 871 kg (129,790 lb)
3rd Gear
4th Gear
5th Gear
6th Gear
7th Gear8th Gear
E L
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 km/h
mph
kg x 1000
lb x 1000
1%
25%
5%
10%
15%
20%
0 10 20 30 40 50 60 70 80
0 20 40 60 80 100 120 140 160 180
0 5 10 15 20 25 30
623G RetardingGross Weight
Speed
Effe
ctiv
e G
rade
(Fav
orab
le)
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