Model 7648
 
- Digs 7 feet 6 inches (2.3M) deep; up to 48 inches (122CM) wide
- Vari-Crowd hydrostatic transmission for infinitely variable crawl speeds.
- Available in dirt and rock versions to handle the most difficult cross-country digging conditions.
 
 
 
 
GENERAL SPECIFICATIONS
Weight - Standard Unit less accessories44,500 pounds (20,200kgs.)
Ground Bearing Pressure7.7 PSI (.54kgs./CM2) with 24 inch (609.6MM) pads.

5.8 PSI (.41 kgs./CM2) with 30 inch (762MM) pads.

 

Power UnitCaterpillar turbocharged diesel Model 3304T.

Horsepower

150 HP (112KW)......@2150 RPM

Wheel TransmissionHelical gear unit with high-torque capacity

4 digging wheel speeds plus one reverse speed 2-12 RPM forward.

Crawler Drive Vari-CrowdHydrostatic Drive-2 speed transmission with Hi-Lo range for a total of four ranges forward or reverse:

     1-Lo, variable to 2.6 FPM (.8M/Min.)

     1-Hi, variable to 29 FPM (8.7M/Min.)

     2-Lo, variable to 14 FPM (4.3M/Min.)

     2-Hi, variable to 156 FPM (42.5M/Min.)         1.8 MPH (2.9KM/HR)

ClutchMain Clutch

     14 inch (356MM) two plate clutch.

      Single lever controls all operations.

Digging Clutch

      10 inch (254MM) three plate, adjustable to        load requirements.

CrawlersCrawler Track

      24 inch (610MM) wide rolled section       grousers bolt to reinforced drop-forged rails,       joined with bushed 1 1/2 inch (38.1MM)       induction hardened pins.

Sprockets...wide spaced alloy steel teeth drive on both ends of pins.

11 lower track rollers. 1000-hour lube service. Anti-friction bearings, sprockets and idles.

Crawler Differential

          Hypoid unit

          Alloy steel heat treated shafts

Hydraulic BrakesHydraulic caliper type diusc with 18 inch (457MM) diameter rotor.
Main FrameAll welded, high-grade steel box type girder frame.
BoomSingle reinforced high tensile steel weldment.
TrucksUpper Trucks

          4 inch (101.6MM) dia. alloy steel           shafts-H.T.

          Adjustable for variable cutting widths.

          Split wheels for ease of replacement.

          Anti-Friction bearing mounted.

Lower Trucks

          Steel weldment body. Anti-friction           bearing mounted wheels. Metal face           seals.

          Bolt-on wheel rims, easily replaced.

Front and rear Stay Rods

          Straight tubular compression mounted.    

HYDRAULIC EQUIPMENT
Hydraulic Boom Hoist Transmission2 high-torque, hydraulic motors for raising and lowering front and rear independently.
Hydraulic PumpsConveyor drive from piston pump for variable belt speed.

Separate dual pumps for independent control of hydraulic boom hoist and conveyor elevation.

Crawler drive pump-variable displacement over center axial piston pump.

Hydraulic ReserviorCapacity - 60 gallons (227L.)

Equipped with high-capacity return line filter, charge pump suction filter, cartridge type.

Sealed hydraulic system.

Oil CoolerHigh-capacity, air-to-oil hydraulic oil cooler
DIGGING WHEEL
Engine TransmissionFirst gear...................2 Wheel RPM

      Second gear...............4 Wheel RPM

      Third gear...................7 Wheel RPM

      Fourth gear................12 Wheel RPM

      Reverse gear.............. ----------

 

Digging DifferentialHypoid gearing.

Heat treated alloy steel shafts.

Digging Wheel RimsOne piece, high tensile 1 inch (25.4MM) steel plate.

Match drilled in pairs

Drop-forged heat treated alloy steel segments welded to rims.

Buckets15 flush, contour mounted 1 inch (25.4MM) tensile steel.

Drop forged ROTO-Tooth shanks, easy tap-on, knock-off.

Conveyor DrivePatented planetary gear drives with external gydraulic motors at each end.

No chains or sprockets.

Discharge Speed: 215-1000 FPM (64-305M/Min.)

Speed and direction independently controlled.

Digging Wheel Drive ShaftOne piece-4 inch (101.6MM) diameter.

Heat treated alloy steel on sealed bearings.

Drop-forged hubs keyed to shaft accommodate, heat treated drop forged alloy steel split drive sprockets.

OPTIONAL EQUIPMENTCarbide Teeth

Bucket Fingers

Center Cutters

Bucket Cleaner

Rock Guard

Hydraulic Track Adjusters:

          27 inch & 30 inch (686MM & 762MM)           Track Shoes

          1-1/8 inch (28.6MM) Rims

          1-1/8 inch (28.6MM) Buckets

          18 Buckets

Slopers

For difficult or unusual digging conditions, alternate tooth patterns available.

Please Consult With Factory For Additional Options.

 

 

NOTE: In accordance with varying material situations, and the Company's policy of constant product improvement, these specifications are subject to change without notice and without incurring responsibility to units previously sold.

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