FieldSpec
Equipment menu

Machine models

Cat 777D specifications

Entries in this reference
Listing-entry count
1
Short answer

Cat 777D: rigid rock truck.

Selected configuration figures
ConfigurationDocumented field and quantity
777D
Gross Power
1,000 hp
Operating Weight - Empty
141,749 lb
777D specification matrix — Dimensions and weight
Specification777D
Overall Length32.1 ft
Overall Width20.02 ft
Overall Height16.41 ft
Wheelbase15 ft
Ground Clearance2.46 ft
Dump Height32.71 ft
Dump Ground Clearance2.87 ft
Inside Body Depth - Maximum6.3 ft
Inside Body Length23.73 ft
Inside Body Width17.06 ft
Operating Width20.03 ft
Outside Body Width18.12 ft
Overall Body Length31.3 ft
Overall Canopy Width19.11 ft
Overall Height - Body Raised33 ft
Loading Height - Empty14.37 ft
Centerline Front Tire Width13.69 ft
Centerline Of Rear Dual Tire Width11.75 ft
Dump Clearance3.1 ft
Engine Guard Clearance2.33 ft
Front Canopy Height16.61 ft
Height - Top Of ROPS14.8 ft
Overall Tire Width17.27 ft
Rear Axle - Clearance2.5 ft
Rear Axle - Tail9.11 ft
Wheel Base14.99 ft
Dump
Specification777D
Rated Payload200,000 lb
Load Capacity - Heaped79.14 yd3
Load Capacity - Struck54.94 yd3
Raise Time15 sec
Engine
Specification777D
Number Of Cylinders8
Engine Model3508A
Gross Power1,000 hp
Net Power938 hp
Max Torque3,476 lb-ft
Displacement2,105 cu in
Torque Measured @1,300 rpm
Torque Rise23 %
Bore6.7 in
Stroke7.5 in
Net Power - Cat938 hp
Net Power - ISO 9249938 hp
Net Power - SAE J1349938 hp
Net Power - 80/1269/Eec938 hp
Gross Power - SAE J19951,000 hp
Flywheel Power938 hp
Rated Engine Speed1,750 rpm
Operational
Specification777D
Fuel Capacity300.4 gal
Cooling System Fluid Capacity85.9 gal
Engine Oil Capacity32.8 gal
Diff And Final Drive Fluid Capacity87 gal
Steering System Fluid Capacity22.2 gal
Brake/Hoist System Fluid Capacity109.7 gal
Hydraulic System Fluid Capacity36.5 gal
Transmission and speeds
Specification777D
Transmission Typeautomatic power shift
Number Of Gears - Forward7
Number Of Gears - Reverse1
Max Speed37.6 mph
Reverse7.4 mph
Forward - 16.5 mph
Forward - 28.9 mph
Forward - 312 mph
Forward - 416.2 mph
Forward - 521.9 mph
Forward - 629.4 mph
Forward - 739.9 mph
Steering
Specification777D
Steering StandardsSAE J1511 OCT90, ISO 5010:1992 (E)
Steer Angle31.8 degrees
Weights
Specification777D
Empty Weight155,000 lb
Loaded Weight355,011 lb
Weight Distribution Front - Empty45.4 %
Weight Distribution Rear - Empty54.6 %
Weight Distribution Front - Loaded33.3 %
Weight Distribution Rear - Loaded66.7 %
Tires
Specification777D
Standard Tire27.00-R49 (E4)
Brakes
Specification777D
Brake Surface - Front432 in2
Brake Surface - Rear15,828 in2
Brake StandardsISO 3450: 1996; SAE J1473 OCT90
Body Hoists
Specification777D
Pump Flow - High Idle119 gpm
Relief Valve Setting - Raise2,750 psi
Body Raise Time - High Idle15 s
Body Lower Time - Float13 s
Body Power Down - High Idle13 s
Relief Valve Setting - Lower3,450 psi
Final Drives
Specification777D
Planetary Ratio7.00:1
Differential Ratio2.74:1
Total Reduction Ratio19.16:1
Operating Specifications
Specification777D
Circle Clearance Diameter85.5 ft
Nominal Payload Class (100%)178,920 lb
Top Speed - Loaded39.9 mph
Body Capacity - Struck55.1 yd3
Maximum Capacity178,920 lb
Raise Time15 s
Lower Time14 s
Body Capacity - SAE 2:178.6 yd3
Service Refill Capacities
Specification777D
Cooling System86 gal
Differential - Final Drives87 gal
Steering Tank15 gal
Steering System - Including Tank22 gal
Fuel Tank300 gal
Torque Converter - Transmission System - Including Sump36.5 gal
Torque Converter - Brake - Hoist Hydraulic Tank66 gal
Brake Hoist System - Includes Tank109.7 gal
Torque Converter - Brake - Hoist System - Including Tank133 gal
Weight Distributions Approximate
Specification777D
Front Axle - Empty47 %
Front Axle - Loaded33 %
Rear Axle - Empty53 %
Rear Axle - Loaded67 %
Weights Approximate
Specification777D
Operating Weight - Empty141,749 lb
Operating Weight - Loaded355,000 lb
Target Gross Machine Operating Weight360,000 lb
Chassis Weight107,100 lb
Body Weight34,800 lb
Capacity Dual Slope 100% Fill Factor
Specification777D
Struck55 yd3
Heaped 2:1 (SAE)78.6 yd3
ROPS
Specification777D
ROPS/FOPS StandardsSAE J1040 MAY94, ISO 3471:1997
Sound
Specification777D
Sound StandardsANSI/SAE J1166 MAY90, SAE J88 JUN96
Suspension
Specification777D
Rear Axle - Oscillation5.4 degrees
Effective Cylinder Stroke - Front12.5 in
Effective Cylinder Stroke - Rear6.5 in
Approximate Weights Dual Slope
Specification777D
Body34,785 lb
Chassis106,964 lb
Approximate Weights Dual Slope Lined
Specification777D
Body46,840 lb
Ratios
Figure777D
Engine horsepower per 1,000 lb of weight6.6
Fuel tank per engine horsepower0.32 gal
Rated payload as a share of empty weight129%
Rated payload per cubic yard of heaped body2,527 lb
Reference directory classification
Equipment grouprigid rock truck
Where the 777D ranks in Cat's list — Scope of the captured comparison
BrandEquipment groupCompared entrySort order
Catrigid rock truck777DDescending quantity; 1 is largest
Figure777DRankLowest in lineHighest in line
Engine power938.0 hp15 of 24450.0 hp4,000.0 hp
Listed weight141,749 lb8 of 1466,500 lb584,225 lb
Fuel capacity300.4 gal12 of 22140.0 gal1,800.0 gal
Horsepower per 1,000 lb6.6 hp7 of 145.8 hp10.1 hp
Rated payload200,000.0 lb7 (tied) of 1479,000.0 lb793,664.0 lb
The 777D beside its neighbours
Base version777B777D777F
Engine power870.4 hp938 hp939 hp
Weight132,399 lb141,749 lb163,090 lb
Fuel capacity250 gal300.4 gal300 gal
Wheelbase15 ft15 ft14.96 ft
Rated payload190,000 lb200,000 lb200,000 lb
777D: forum references — Forum-title search
Forum indexEquipment class queriedNames in the searchMatching titles
Heavy Equipment Forumsrigid rock truckCat and the 777D. That is too few titles to say what owners mostly ask about, so the most recent are listed instead2
Used market for the 777D — Dated first-page listing snapshot
Observation dateListing sourceEquipment searchListings
2026-09-24MachineryTraderCat rigid rock truck20
ModelListedModel yearsLowest askingHighest askingMedian askingMedian hours
777D201998 to 2015$109,074$700,000$133,7042,502
777D: recall reference — Dated CPSC search
Search dateDatabaseNames queriedSearch result
2026-09-24U.S. Consumer Product Safety CommissionCat together with the rigid rock truck 777DNo matching recall in this search

Sources for this page

Evidence classDocument, classification and recorded date
Reference site
  • Reference site: Cat 777D — RitchieSpecs. Observed 2026-09-24.
Forum threads
Used-market listings
Federal agency data

Cat 777D: Configuration records

777D
SpecificationSource figure
Operating Specifications
Circle Clearance Diameter85.5 ft
Nominal Payload Class (100%)178,920 lb
Body Capacity - Struck55.1 yd3
Maximum Capacity178,920 lb
Body Capacity - SAE 2:178.6 yd3
Engine
Gross Power1,000 hp
Net Power938 hp
Displacement2,105 cu in
Number Of Cylinders8
Engine Model3508A
Max Torque3,476 lb-ft
Torque Measured @1,300 rpm
Torque Rise23 %
Bore6.7 in
Stroke7.5 in
Net Power - Cat938 hp
Net Power - ISO 9249938 hp
Net Power - SAE J1349938 hp
Net Power - 80/1269/Eec938 hp
Gross Power - SAE J19951,000 hp
Flywheel Power938 hp
Rated Engine Speed1,750 rpm
Capacity Dual Slope 100% Fill Factor
Heaped 2:1 (SAE)78.6 yd3
Transmission and speeds
Number Of Gears - Forward7
Max Speed37.6 mph
Transmission Typeautomatic power shift
Number Of Gears - Reverse1
Reverse7.4 mph
Forward - 16.5 mph
Forward - 28.9 mph
Forward - 312 mph
Forward - 416.2 mph
Forward - 521.9 mph
Forward - 629.4 mph
Forward - 739.9 mph
Sound
Sound StandardsANSI/SAE J1166 MAY90, SAE J88 JUN96
Final Drives
Planetary Ratio7.00:1
Differential Ratio2.74:1
Total Reduction Ratio19.16:1
Service Refill Capacities
Cooling System86 gal
Differential - Final Drives87 gal
Steering Tank15 gal
Steering System - Including Tank22 gal
Fuel Tank300 gal
Torque Converter - Transmission System - Including Sump36.5 gal
Torque Converter - Brake - Hoist Hydraulic Tank66 gal
Brake Hoist System - Includes Tank109.7 gal
Torque Converter - Brake - Hoist System - Including Tank133 gal
Body Hoists
Pump Flow - High Idle119 gpm
Relief Valve Setting - Raise2,750 psi
Body Raise Time - High Idle15 s
Body Lower Time - Float13 s
Body Power Down - High Idle13 s
Relief Valve Setting - Lower3,450 psi
Suspension
Rear Axle - Oscillation5.4 degrees
Effective Cylinder Stroke - Front12.5 in
Effective Cylinder Stroke - Rear6.5 in
Tires
Standard Tire27.00-R49 (E4)
Steering
Steering StandardsSAE J1511 OCT90, ISO 5010:1992 (E)
ROPS
ROPS/FOPS StandardsSAE J1040 MAY94, ISO 3471:1997
Weights Approximate
Operating Weight - Empty141,749 lb
Operating Weight - Loaded355,000 lb
Target Gross Machine Operating Weight360,000 lb
Chassis Weight107,100 lb
Weights
Empty Weight155,000 lb
Loaded Weight355,011 lb
Weight Distribution Front - Empty45.4 %
Weight Distribution Rear - Empty54.6 %
Weight Distribution Front - Loaded33.3 %
Weight Distribution Rear - Loaded66.7 %
Dimensions and weight
Overall Width20.02 ft
Overall Height16.41 ft
Wheelbase15 ft
Dump Height32.71 ft
Dump Ground Clearance2.87 ft
Dump
Load Capacity - Struck54.94 yd3
Load Capacity - Heaped79.14 yd3
Rated Payload200,000 lb
Operational
Fuel Capacity300.4 gal
Cooling System Fluid Capacity85.9 gal
Engine Oil Capacity32.8 gal
Diff And Final Drive Fluid Capacity87 gal
Steering System Fluid Capacity22.2 gal
Brake/Hoist System Fluid Capacity109.7 gal
Hydraulic System Fluid Capacity36.5 gal
Additional specifications
Overall Length32.1 ft
Ground Clearance2.46 ft
Inside Body Depth - Maximum6.3 ft
Inside Body Length23.73 ft
Inside Body Width17.06 ft
Operating Width20.03 ft
Outside Body Width18.12 ft
Overall Body Length31.3 ft
Overall Canopy Width19.11 ft
Overall Height - Body Raised33 ft
Loading Height - Empty14.37 ft
Centerline Front Tire Width13.69 ft
Centerline Of Rear Dual Tire Width11.75 ft
Dump Clearance3.1 ft
Engine Guard Clearance2.33 ft
Front Canopy Height16.61 ft
Height - Top Of ROPS14.8 ft
Overall Tire Width17.27 ft
Rear Axle - Clearance2.5 ft
Rear Axle - Tail9.11 ft
Wheel Base14.99 ft
Raise Time15 sec
Steer Angle31.8 degrees
Brake Surface - Front432 in2
Brake Surface - Rear15,828 in2
Brake StandardsISO 3450: 1996; SAE J1473 OCT90
Top Speed - Loaded39.9 mph
Lower Time14 s
Front Axle - Empty47 %
Front Axle - Loaded33 %
Rear Axle - Empty53 %
Rear Axle - Loaded67 %
Body Weight34,800 lb
Struck55 yd3
Body34,785 lb
Chassis106,964 lb

Source

More in Cat: 777F, 777B, 777.