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Cat 785 specifications

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Cat 785: rigid rock truck.

Selected configuration figures
ConfigurationDocumented field and quantity
785
Net Power - SAE J1349
1,509 hp
Pump Flow - High Idle
223 gpm
785 specification matrix — Weights Approximate
Specification785
Nominal Rated Payload (36.00R51 Tires)162 ton (US)
Rated Gross Machine Weight (36.00R51 tires)564,000 lb
Nominal Rated Payload (33.00R51 Tires)158 ton (US)
Rated Gross Machine Weight (33.00R51 tires)550,000 lb
Chassis Weight (33.00R51 Tires)187,736 lb
Chassis Weight (36.00R51 Tires)192,959 lb
Body Weight57,779 lb
Engine
Specification785
Gross Power - SAE J19951,600 hp
Net Power - SAE J13491,509 hp
Engine ModelCat 3512E
Emissions RatingFuel Optimized
Bore6.7 in
Stroke8.5 in
Displacement3,573 in³
Capacity HP Body 100% Fill Factor
Specification785
Heaped (SAE 2:1)*110 m3 / 144 yd3
Struck84 m3 / 110 yd3
Weight Distributions Approximate
Specification785
Front Axle - Empty48%
Rear Axle - Empty52%
Front Axle - Loaded33%
Rear Axle - Loaded67%
Final Drives
Specification785
TypeDouble reduction, planetary with full floating axles
Differential Ratio2:10:01
Planetary Ratio10.83:1
Total Reduction Ratio22.75:1
Tires
Specification785
Optional Tires33.00R51
Optional Tire36.00R51
Rims610 mm (24") Rims (optional). 660 mm (26") Rims (optional)
Braking System
Specification785
Service BrakesFour-Corner, Wet Disc, Oil Cooled, Hydraulically Actuated
Front Wet Disc Brake Surface Area9,487 in² / 61270 cm²
Rear - Wet Disc Brake Surface Area13,908 in² / 89728 cm²
StandardsService and Secondary: ISO 3450:2011
Parking BrakeFour corner, multi disc, spring applied, hydraulically released
Body Hoists
Specification785
TypeTwin, two-stage hydraulic cylinders with snubbing valve
Pump Flow - High Idle223 gpm
Relief Valve Setting - Raise2,500 psi
Body Raise Time - High Idle15 s
Body Lower Time - Float15.6 s
Body Power Down- High Idle15.5 s
Suspension
Specification785
TypeSelf-contained nitrogen/oil cylinders, pin-to-pin mounting, top & bottom double shear clevis attachments
Effective Cylinder Stroke - Front12.6 in
Effective Cylinder Stroke - Rear6.5 in
Rear axle - Oscillation+/- 5.4 degrees
Service Refill Capacities
Specification785
Fuel Tank410 gal (US)
Diesel Exhaust Fluid Tank36 gal (US)
Cooling System126 gal (US)
Crankcase54 gal (US)
Front Wheels - Each7.1 gal (US)
Differential - Final Drives139 gal (US)
Steering Tank29 gal (US)
Steering System - Includes Tank31 gal (US)
Brake/Hoist Tank135 gal (US)
Brake Hoist System - Includes Tank143 gal (US)
Torque Converter - Transmission System - Including Sump46 gal (US)
Cab
Specification785
Air ConditioningHFC - 134A refrigerant: 24,500 Btu/h
Heater / Defroster33300 Btu/h
ROPS Standards (1)ROPS (Rollover Protective Structure) meets ISO 3471:2008 for Operator and ISO 13459:2012 for Trainer
FOPS StandardsFOPS (Falling Objects Protective Structure) meets ISO 3449:2005 Level II for Operator and ISO 13459:2012 Level II for Trainer
Steering
Specification785
Steer Angle25.1 °
Turning Diameter - ISO 7457:1997 (33.00R51 tires)96.6 ft
Steering StandardsISO 5010:2019
Dimensions (All dimensions are approximate. MSD II Body, 33R51 tires, unloaded machine.)
Specification785
Height - Top of ROPS17.09 ft
Overall Body Length39.32 ft
Inside Body Length27.29 ft
Overall Length39.23 ft
Wheel Base17 ft
Rear Axle - Tail12.56 ft
Ground Clearance3.29 ft
Dump Clearance3.7 ft
Loading Height - Empty17.39 ft
Inside Body Depth - Maximum9.15 ft
Overall Height - Body Raised39.48 ft
Operating Width24.72 ft
Centerline Front Tire Width15.91 ft
Engine Guard Clearance3.41 ft
Overall Canopy Width24.81 ft
Outside Body Width22 ft
Inside Body Width19.72 ft
Front Canopy Height19.8 ft
Rear Axle - Clearance3.25 ft
Centerline of Rear Dual Tire Width14.06 ft
Overall Tire Width20.59 ft
Sound
Specification785
Sound StandardsThe operator sound pressure level, 77 dB(A) with direct drive and 75 dB9A) with optional clutch, tested to ISO 6396:2008
Transmission and speeds
Specification785
Forward - 17.4 mph
Forward - 210 mph
Forward - 313.7 mph
Forward - 418.5 mph
Forward - 525 mph
Forward - 635.6 mph
Reverse7.2 mph
Top Speed - Loaded35.6 mph
Ratios
Figure785
Fuel tank per engine horsepower0.26 gal
Reference directory classification
Equipment grouprigid rock truck
The 785 beside its neighbours
Base version777785785 Bare Chassis
Engine power1,025 hp1,600 hp1,600 hp
Fuel capacity785: 410 gal (US); 785 Bare Chassis: 410 gal (US)
Wheelbase785: 17 ft

History and service record of 785

  • Caterpillar's first mining truck. The 785 was Caterpillar's first entry into the mining truck market, more than three decades ago, and the line has stayed a proven performer at mine sites worldwide ever since. Caterpillar, 785 Mining Trucks product page.
  • Why tire choice matters here. Caterpillar quotes the 785 delivering about 6% higher TKPH/TMPH (tonne- or ton-per-hour capability) with its larger tire options, which lets a mine run the truck faster on flat, long-haul routes without exceeding the tire's heat and load rating. Caterpillar, 785 Mining Trucks product page.

785: forum references

Related discussion: “CAT 785g”: 785 Bare Chassis.

Used market for the 785 — Dated first-page listing snapshot
Observation dateListing sourceEquipment searchListings
2026-09-24MachineryTraderCat rigid rock truck15
ModelListedModel yearsLowest askingHighest askingMedian askingMedian hours
785151994 to 2012$160,000$750,000$160,00028,412
785: recall reference — Dated CPSC search
Search dateDatabaseNames queriedSearch result
2026-09-24U.S. Consumer Product Safety CommissionCat together with the rigid rock truck 785No matching recall in this search

Sources for this page

Evidence classDocument, classification and recorded date
Manufacturer
  • Manufacturer: Cat 785 — Caterpillar Inc.. Observed 2026-09-24.
Published history
Used-market listings
Federal agency data
Recorded observations — Forum-title snapshot
Observation fieldRecorded value
Title count4
Forum indexesHeavy Equipment Forums
Search wordingthe 785 rigid rock truck
Latest title quoted by the referenceCAT 785g

Cat 785: Configuration records

785
SpecificationSource figure
Engine
Displacement3,573 in³
Engine ModelCat 3512E
Bore6.7 in
Stroke8.5 in
Net Power - SAE J13491,509 hp
Gross Power - SAE J19951,600 hp
Emissions RatingFuel Optimized
Cab
Air ConditioningHFC - 134A refrigerant: 24,500 Btu/h
Heater / Defroster33300 Btu/h
ROPS Standards (1)ROPS (Rollover Protective Structure) meets ISO 3471:2008 for Operator and ISO 13459:2012 for Trainer
Transmission and speeds
Reverse7.2 mph
Forward - 17.4 mph
Forward - 210 mph
Forward - 313.7 mph
Forward - 418.5 mph
Forward - 525 mph
Forward - 635.6 mph
Sound
Sound StandardsThe operator sound pressure level, 77 dB(A) with direct drive and 75 dB9A) with optional clutch, tested to ISO 6396:2008
Final Drives
Planetary Ratio10.83:1
Differential Ratio2:10:01
Total Reduction Ratio22.75:1
Service Refill Capacities
Cooling System126 gal (US)
Differential - Final Drives139 gal (US)
Steering Tank29 gal (US)
Fuel Tank410 gal (US)
Torque Converter - Transmission System - Including Sump46 gal (US)
Brake Hoist System - Includes Tank143 gal (US)
Crankcase54 gal (US)
Diesel Exhaust Fluid Tank36 gal (US)
Front Wheels - Each7.1 gal (US)
Steering System - Includes Tank31 gal (US)
Brake/Hoist Tank135 gal (US)
Body Hoists
Pump Flow - High Idle223 gpm
Relief Valve Setting - Raise2,500 psi
Body Raise Time - High Idle15 s
Body Lower Time - Float15.6 s
Body Power Down- High Idle15.5 s
Suspension
Effective Cylinder Stroke - Front12.6 in
Effective Cylinder Stroke - Rear6.5 in
Rear axle - Oscillation+/- 5.4 degrees
Tires
Optional Tires33.00R51
Optional Tire36.00R51
Rims610 mm (24") Rims (optional). 660 mm (26") Rims (optional)
Steering
Steering StandardsISO 5010:2019
Turning Diameter - ISO 7457:1997 (33.00R51 tires)96.6 ft
Weights Approximate
Nominal Rated Payload (36.00R51 Tires)162 ton (US)
Rated Gross Machine Weight (36.00R51 tires)564,000 lb
Nominal Rated Payload (33.00R51 Tires)158 ton (US)
Rated Gross Machine Weight (33.00R51 tires)550,000 lb
Chassis Weight (33.00R51 Tires)187,736 lb
Chassis Weight (36.00R51 Tires)192,959 lb
Braking System
Service BrakesFour-Corner, Wet Disc, Oil Cooled, Hydraulically Actuated
Front Wet Disc Brake Surface Area9,487 in² / 61270 cm²
Rear - Wet Disc Brake Surface Area13,908 in² / 89728 cm²
Parking BrakeFour corner, multi disc, spring applied, hydraulically released
Additional specifications
Top Speed - Loaded35.6 mph
Steer Angle25.1 °
TypeTwin, two-stage hydraulic cylinders with snubbing valve
Front Axle - Empty48%
Front Axle - Loaded33%
Rear Axle - Empty52%
Rear Axle - Loaded67%
Body Weight57,779 lb
StandardsService and Secondary: ISO 3450:2011
FOPS StandardsFOPS (Falling Objects Protective Structure) meets ISO 3449:2005 Level II for Operator and ISO 13459:2012 Level II for Trainer
Heaped (SAE 2:1)*110 m3 / 144 yd3
Struck84 m3 / 110 yd3
Height - Top of ROPS17.09 ft
Overall Body Length39.32 ft
Inside Body Length27.29 ft
Overall Length39.23 ft
Wheel Base17 ft
Rear Axle - Tail12.56 ft
Ground Clearance3.29 ft
Dump Clearance3.7 ft
Loading Height - Empty17.39 ft
Inside Body Depth - Maximum9.15 ft
Overall Height - Body Raised39.48 ft
Operating Width24.72 ft
Centerline Front Tire Width15.91 ft
Engine Guard Clearance3.41 ft
Overall Canopy Width24.81 ft
Outside Body Width22 ft
Inside Body Width19.72 ft
Front Canopy Height19.8 ft
Rear Axle - Clearance3.25 ft
Centerline of Rear Dual Tire Width14.06 ft
Overall Tire Width20.59 ft

Source

More in Cat: 785 Bare Chassis, 785C/785D, 789C.