Machine models

Cat 777B specifications

Entries in this reference
Listing-entry count
1

Short answer

The Cat 777B is an 870.4-horsepower rigid rock truck, and Cat lists one version of it. Listed weight is 132,399 lb.

Operational
Specification	777B
Fuel Capacity	250 gal
Tire Size	24.00-49 48PR

Transmission and speeds
Specification	777B
Number Of Gears - Forward	7
Max Speed	37.3 mph

Weights
Specification	777B
Empty Weight	132,399 lb
Loaded Weight	324,005 lb
Weight Distribution Front - Empty	47 %
Weight Distribution Rear - Empty	53 %
Weight Distribution Front - Loaded	33 %
Weight Distribution Rear - Loaded	67 %

Ratios
Figure	777B
Engine horsepower per 1,000 lb of weight	6.6
Fuel tank per engine horsepower	0.29 gal
Rated payload per cubic yard of heaped body	2,832 lb

Reference directory classification
Equipment group	rigid rock truck

Cat's listing for the 777B matches a rigid rock truck; see the dump trucks page.

Where the 777B ranks in Cat's list — Scope of the captured comparison
Brand	Equipment group	Compared entry	Sort order
Cat	rigid rock truck	777B	Descending quantity; 1 is largest

Figure	777B	Rank	Lowest in line	Highest in line
Engine power	870.4 hp	16 of 24	450.0 hp	4,000.0 hp
Listed weight	132,399 lb	9 of 14	66,500 lb	584,225 lb
Fuel capacity	250.0 gal	14 of 22	140.0 gal	1,800.0 gal
Horsepower per 1,000 lb	6.6 hp	8 of 14	5.8 hp	10.1 hp
Rated payload	190,000.0 lb	9 of 14	79,000.0 lb	793,664.0 lb

The 777B beside its neighbours
Base version	772 Bare Chassis	777B	777D
Engine power	605 hp	870.4 hp	938 hp
Weight	777B: 132,399 lb; 777D: 141,749 lb
Fuel capacity	140 gal (US)	250 gal	300.4 gal
Wheelbase	777B: 15 ft; 777D: 15 ft
Rated payload	777B: 190,000 lb; 777D: 200,000 lb

777B: forum references — Forum-title search
Forum index	Equipment class queried	Names in the search	Matching titles
Heavy Equipment Forums	rigid rock truck	Cat and the 777B. That is too few titles to say what owners mostly ask about, so the most recent are listed instead	1

Used market for the 777B — Dated first-page listing snapshot
Observation date	Listing source	Equipment search	Listings
2026-09-24	MachineryTrader	Cat rigid rock truck	1

Model	Listed	Model years	Lowest asking	Highest asking	Median asking	Median hours
777B	1	1990	$79,500	$79,500	$79,500	None shown

777B: recall reference — Dated CPSC search
Search date	Database	Names queried	Search result
2026-09-24	U.S. Consumer Product Safety Commission	Cat together with the rigid rock truck 777B	No matching recall in this search

Sources for this page
Evidence class	Document, classification and recorded date
Reference site	Reference site: Cat 777B — RitchieSpecs. Observed 2026-09-24.
Forum threads	Forum threads: Heavy Equipment Forums thread index for Cat 777B — Heavy Equipment Forums. Observed 2026-09-24.
Used-market listings	Used-market listings: MachineryTrader listings for Cat 777B — MachineryTrader. Observed 2026-09-24.
Federal agency data	Federal agency data: Recall database search for Cat — U.S. Consumer Product Safety Commission. Observed 2026-09-24.

Cat 777B: Configuration records

777B

Specification	Source figure
Engine
Gross Power	920 hp
Net Power	870.4 hp
Displacement	2,105 cu in
Transmission and speeds
Number Of Gears - Forward	7
Max Speed	37.3 mph
Weights
Empty Weight	132,399 lb
Loaded Weight	324,005 lb
Weight Distribution Front - Empty	47 %
Weight Distribution Rear - Empty	53 %
Weight Distribution Front - Loaded	33 %
Weight Distribution Rear - Loaded	67 %
Dimensions and weight
Overall Width	17.93 ft
Overall Height	16.08 ft
Wheelbase	15 ft
Dump Height	30.52 ft
Dump
Load Capacity - Struck	47.61 yd3
Load Capacity - Heaped	67.1 yd3
Rated Payload	190,000 lb
Operational
Fuel Capacity	250 gal
Tire Size	24.00-49 48PR
Additional specifications
Overall Length	32.12 ft