Machine models

Komatsu HD785-1 specifications

Entries in this reference
Listing-entry count
1

Short answer

The Komatsu HD785-1 is an 877-horsepower rigid rock truck, and Komatsu lists one version of it. Listed weight is 113,538 lb.

Operational
Specification	HD785-1
Fuel Capacity	327.6 gal
Cooling System Fluid Capacity	63.5 gal
Engine Oil Capacity	39.7 gal
Diff And Final Drive Fluid Capacity	59.2 gal
Hydraulic System Fluid Capacity	121.6 gal
Tire Size	24.00-49-42PR

Transmission and speeds
Specification	HD785-1
Transmission Type	Komatsu TORQFLOW planetary gear
Number Of Gears - Forward	6
Number Of Gears - Reverse	1
Max Speed	43.5 mph

Weights
Specification	HD785-1
Empty Weight	113,538 lb
Loaded Weight	285,620 lb
Weight Distribution Front - Empty	48.2 %
Weight Distribution Rear - Empty	51.8 %
Weight Distribution Front - Loaded	32.3 %
Weight Distribution Rear - Loaded	67.7 %

Ratios
Figure	HD785-1
Engine horsepower per 1,000 lb of weight	7.7
Fuel tank per engine horsepower	0.37 gal
Rated payload per cubic yard of heaped body	2,538 lb

Reference directory classification
Equipment group	rigid rock truck

Komatsu's listing for the HD785-1 matches a rigid rock truck; see the dump trucks page.

Where the HD785-1 ranks in Komatsu's list — Scope of the captured comparison
Brand	Equipment group	Compared entry	Sort order
Komatsu	rigid rock truck	HD785-1	Descending quantity; 1 is largest

Figure	HD785-1	Rank	Lowest in line	Highest in line
Engine power	877.0 hp	5 of 9	230.0 hp	3,346.0 hp
Listed weight	113,538 lb	5 of 12	37,016 lb	549,998 lb
Fuel capacity	327.6 gal	6 of 10	127.9 gal	1,400.0 gal
Horsepower per 1,000 lb	7.7 hp	2 of 9	6.0 hp	8.4 hp
Rated payload	171,961.0 lb	5 (tied) of 10	36,000.0 lb	719,997.0 lb

The HD785-1 beside its neighbours
Base version	HD605-5	HD785-1	HD785-5
Engine power	715 hp	877 hp	1,042 hp
Weight	105,436 lb	113,538 lb	155,403 lb
Fuel capacity	206.1 gal	327.6 gal	330 gal
Wheelbase	HD785-1: 15.59 ft
Rated payload	126,000 lb	171,961 lb	171,961 lb

HD785-1: forum references — Forum-title search
Forum index	Equipment class queried	Names in the search	Matching titles
Heavy Equipment Forums	rigid rock truck	Komatsu and the HD785 line that the HD785-1 belongs to (no title names the exact model). That is too few titles to say what owners mostly ask about, so the most recent are listed instead	2

HD785-1: dated market and recall observations — Dated listing search
Date	Listing index	Equipment class	Names queried	Result
2026-09-24	MachineryTrader (machinerytrader.com)	rigid rock truck	HD785-1	No matching offers in this snapshot

Dated CPSC search
Date	Database	Names queried	Result
2026-09-24	U.S. Consumer Product Safety Commission	Komatsu; HD785-1	No matching recall in the stated search

Sources for this page
Evidence class	Document, classification and recorded date
Reference site	Reference site: Komatsu HD785-1 — RitchieSpecs. Observed 2026-09-24.
Forum threads	Forum threads: Heavy Equipment Forums thread index for Komatsu HD785-1 — Heavy Equipment Forums. Observed 2026-09-24.
Federal agency data	Federal agency data: Recall database search for Komatsu — U.S. Consumer Product Safety Commission. Observed 2026-09-24.

Komatsu HD785-1: Configuration records

HD785-1

Specification	Source figure
Dimensions and weight
Overall Length	33.24 ft
Overall Width	16.41 ft
Overall Height	15.98 ft
Wheelbase	15.59 ft
Ground Clearance	2.56 ft
Dump Height	29.53 ft
Dump Ground Clearance	2.96 ft
Dump
Rated Payload	171,961 lb
Load Capacity - Heaped	67.76 yd3
Dump Angle	64 degrees
Engine
Engine Model	KT-2300
Gross Power	900 hp
Net Power	877 hp
Aspiration	turbocharged
Displacement	2,307 cu in
Operational
Fuel Capacity	327.6 gal
Cooling System Fluid Capacity	63.5 gal
Engine Oil Capacity	39.7 gal
Diff And Final Drive Fluid Capacity	59.2 gal
Hydraulic System Fluid Capacity	121.6 gal
Tire Size	24.00-49-42PR
Transmission and speeds
Transmission Type	Komatsu TORQFLOW planetary gear
Number Of Gears - Forward	6
Number Of Gears - Reverse	1
Max Speed	43.5 mph
Weights
Empty Weight	113,538 lb
Loaded Weight	285,620 lb
Weight Distribution Front - Empty	48.2 %
Weight Distribution Rear - Empty	51.8 %
Weight Distribution Front - Loaded	32.3 %
Weight Distribution Rear - Loaded	67.7 %