91 t Rated Payload | 60 m³ SAE Body | 1,200 HP | Maximum Speed 65 km/h

Move more tons per shift. Control your cost per ton.

The Komatsu HD785-7 is a 91-tonne mechanical-drive rigid dump truck designed for demanding mining and quarry haulage.

With a 91 t rated payload, 60 m³ heaped body and Komatsu SAA12V140E-3 engine producing up to 1,200 HP, the HD785-7 is built around the realities of mine production: loaded uphill travel, controlled downhill operation, repeated haul cycles, payload management and long operating hours.

But a mine does not make money from horsepower.

It makes money from tons moved reliably at a controlled cost per ton.

That is the real value of the HD785-7.

Request HD785-7 Price & Availability

Why Mine Operators Choose the Komatsu HD785-7

A mining truck affects much more than transportation.

Its performance influences:

tons moved per hour;
excavator waiting time;
fleet size;
fuel consumption;
tire life;
brake and drivetrain wear;
maintenance hours;
unplanned downtime.

The right truck must therefore balance payload, speed, braking, durability and operating cost.

The HD785-7 is designed around that balance.

91-Ton Payload: More Material per Haul Cycle

The HD785-7 has a rated payload of 91 tonnes and a 60 m³ SAE heaped body.

That gives the truck the capacity required for high-volume movement of:

ore;
overburden;
coal;
rock;
aggregates;
other bulk mining materials.

What does this mean for your mine?

A larger productive payload allows more material to be moved during each haul cycle.

But simply loading as much material as possible is not the objective.

Underloading means more trips are required.

Overloading can increase wear on:

tires;
brakes;
drivetrain components;
suspension;
structural components.

The real target is therefore:

the right payload × the right cycle time × high machine availability.

Customer Benefit

The HD785-7 helps mine operators focus on a more important performance indicator:

cost per ton moved — not simply cost per truck.

1,200 HP for Demanding Mine Haul Roads

The HD785-7 is powered by the Komatsu SAA12V140E-3, a 12-cylinder turbocharged and aftercooled diesel engine.

Gross power: 895 kW / 1,200 HP
Net power: 879 kW / 1,178 HP
Rated speed: 1,900 rpm

High engine output matters most when the truck is fully loaded and moving uphill.

Feature

High-output Komatsu diesel engine.

Advantage

Strong power reserve for loaded acceleration and climbing.

Benefit

Better ability to maintain productive travel speeds on demanding haul profiles.

For a mine, that means the engine specification translates into something commercially meaningful:

less lost time on grades and more predictable haul cycles.

Power When You Need It, Economy When You Don’t

The HD785-7 uses Variable HorsePower Control to match available engine power to operating demand.

Power mode supports demanding production conditions such as loaded uphill travel.

Economy mode limits unnecessary engine output when maximum power is not required.

Why does this matter?

A mining truck does not require full power during every part of the cycle.

Its load changes between:

loading → loaded travel → unloading → empty return.

Using maximum engine power when it is unnecessary can add fuel cost without improving production.

Customer Benefit

The value is not simply lower fuel consumption.

The more useful objective is:

lower fuel consumption per ton moved.

That is the metric mine operators should compare when evaluating haul trucks.

Strong Retarding Performance for Long Downhill Hauls

Mine roads are not only about climbing.

Long downhill sections can become one of the biggest constraints on both safety and productivity.

The HD785-7 uses oil-cooled multiple-disc brakes on all four wheels, which also operate as a retarder.

Continuous-descent retarding capacity is approximately:

1,092 kW / 1,464 HP

Feature

Four-wheel oil-cooled retarding system.

Advantage

Retarding force is distributed across all four wheels for more stable downhill control.

Benefit

Operators can maintain better control on long descents without relying only on conventional service braking.

For the mine, this supports:

safer downhill travel + consistent cycle time + lower operator workload.

A truck that climbs quickly but must descend extremely slowly can still become a bottleneck.

The HD785-7 is engineered for the complete haul cycle.

Automatic Retard Speed Control Helps Maintain Downhill Speed

The Automatic Retard Speed Control system allows the operator to set a target downhill speed.

The truck then automatically uses the retarder to help maintain that speed.

Feature

Automatic downhill speed control.

Advantage

The operator does not need to continuously adjust braking during long descents.

Benefit

The driver can focus more attention on:

steering;
road condition;
traffic;
machine positioning.

For fleet managers, this can also help reduce variation between different operators and shifts.

More consistent driving supports more consistent production.

Automatic Transmission Designed for Repeated Haul Cycles

The HD785-7 uses a fully automatic planetary transmission with:

7 forward speeds
2 reverse speeds

Maximum travel speed is approximately 65 km/h.

The transmission and electronic control system are designed to select an appropriate gear according to operating conditions.

Why does this matter?

Mining trucks repeat the same basic process thousands of times:

accelerate → climb → haul → brake → dump → return.

Every unnecessary shift, hesitation or loss of momentum adds time to the cycle.

Customer Benefit

Smooth automatic shifting supports:

predictable acceleration;
reduced operator workload;
smoother power delivery;
more consistent haul cycles.

The transmission is not just a component.

It is part of the productivity system.

Payload Management Helps Protect Productivity and Component Life

One of the easiest ways to increase mining operating cost is poor payload discipline.

If the truck is consistently underloaded:

you need more trips to move the same tonnage.

If it is consistently overloaded:

tires, brakes and drivetrain components may wear faster.

The HD785-7 can use payload monitoring to help operators and fleet managers track truck loading.

Customer Benefit

Instead of telling the loader operator to simply “fill the truck as much as possible,” management can work toward a controlled target payload.

That supports two objectives at the same time:

maximize production

while

avoiding unnecessary component stress.

Maintenance Features Designed to Keep the Truck Working

A mining truck generates value when it is hauling.

A truck in the workshop generates cost.

HD785-7 maintenance features include centralized service points and extended service intervals under applicable Komatsu maintenance requirements.

Typical published intervals include:

Engine oil: up to 500 hours

Hydraulic oil: up to 4,000 hours

The truck also uses wet multiple-disc brakes designed to operate in a sealed environment.

Customer Benefit

Simpler routine maintenance can help reduce:

service time;
workshop workload;
unnecessary machine downtime.

For a high-utilization mine fleet, even small improvements in availability can translate into significant additional haulage capacity.

Fully Hydraulic Braking Removes Air-System Problems

The HD785-7 uses a fully hydraulic braking system rather than a conventional pneumatic brake circuit.

That eliminates air-system problems associated with moisture and condensation.

Why can this matter?

Moisture in pneumatic systems may create additional maintenance concerns, particularly in cold operating environments.

Removing the air circuit eliminates one potential source of:

contamination;
corrosion;
freezing;
additional maintenance work.

Customer Benefit

Fewer unnecessary systems to maintain and fewer potential causes of downtime.

Built as an Integrated Komatsu Powertrain

A mining truck is not simply an engine connected to a large body.

Its productivity depends on how the complete system works together:

engine → torque converter → transmission → axles → brakes → suspension → frame.

Komatsu designs major HD785-7 systems as an integrated package.

Advantage

Major systems are engineered around the operating requirements of the complete truck.

Benefit

For the mine operator, the value is system-level performance rather than one impressive component specification.

This becomes particularly important under:

repeated loading impact;
rough haul roads;
long gradients;
heavy payloads;
multi-shift operation.

A Mining Truck Should Be Matched to the Loading Machine

Buying an HD785-7 should not start with the truck alone.

It should start with your loading and haulage system.

Before selecting the truck, evaluate:

excavator or loader model;
bucket capacity;
bucket payload;
material density;
number of loading passes;
haul distance;
road gradient;
road condition;
target production;
truck fleet size.

Example of the real question

Do not ask only:

“Can this excavator load an HD785-7?”

Ask:

“How many passes are required, how long does loading take, and does this combination achieve our target tons per hour?”

A truck that is too large for the excavator may spend too much time waiting to be loaded.

A truck that is too small may require excessive trips.

Customer Benefit

Correct excavator–truck matching helps reduce:

loading delays + truck queuing + unnecessary fleet size.

The result is better utilization of both the excavator and the haul truck.

Is the HD785-7 Right for Your Mine?

The HD785-7 is particularly relevant when your operation requires a mechanical-drive mining truck around the 90-ton payload class.

Typical applications include:

open-pit mining;
ore haulage;
overburden removal;
coal mining;
quarry operations;
aggregate production;
large earthmoving projects.

However, truck selection should always be based on actual operating conditions.

Before choosing an HD785-7, confirm:

Material

What material are you hauling and what is its density?

Loading equipment

Which excavator or wheel loader will load the truck?

Haul distance

What is the loaded and empty travel distance?

Grade

What are the maximum uphill and downhill gradients?

Road condition

Is the road hard, soft, rough, muddy or highly abrasive?

Production target

How many tons must be moved per hour or per shift?

Operating schedule

How many hours per day will the trucks operate?

These answers determine whether HD785-7 is simply technically suitable or economically suitable.

Komatsu HD785-7 Key Specifications

Specification	Value
Rated payload	91 t
Heaped body capacity	60 m³ SAE 2:1
Struck body capacity	40 m³
Engine	Komatsu SAA12V140E-3
Gross engine power	895 kW / 1,200 HP
Net engine power	879 kW / 1,178 HP
Engine displacement	30.48 L
Transmission	7 Forward / 2 Reverse
Maximum travel speed	65 km/h
Standard tire size	27.00 R49

Actual machine specifications can vary by production year, serial number, destination market and configuration. Always confirm the specification of the specific truck before purchase.

The Real Cost of a Mining Truck Is More Than the Purchase Price

Two trucks with similar purchase prices can produce very different operating economics.

The true cost includes:

acquisition price;
fuel;
tires;
scheduled maintenance;
component repairs;
operators;
downtime;
parts availability;
machine utilization.

That means the correct purchasing question is not:

“Which mining truck is cheaper?”

It is:

“Which truck gives us the lowest sustainable cost per ton over our actual haul cycle?”

That is the commercial logic behind the HD785-7.

Why Buy Komatsu HD785-7 Through Great Tech (GRT)?

International heavy-equipment purchasing creates risks beyond the machine price.

Buyers also need to consider:

exact machine configuration;
serial number;
operating hours;
engine condition;
transmission condition;
brake and retarder condition;
frame condition;
tire condition;
maintenance records;
parts availability after delivery.

Great Tech (GRT) supports international customers with heavy equipment, diesel engines and spare-parts sourcing.

Our role is not simply to send an HD785-7 quotation.

We help customers evaluate the complete purchasing requirement:

machine + technical condition + parts support + international supply.

Support Beyond the Truck

A mining company does not stop purchasing after receiving the machine.

During its operating life, the fleet may require:

engine parts;
filtration products;
cooling-system components;
transmission parts;
drivetrain parts;
sensors and electrical components;
brake components;
maintenance parts.

GRT supports multi-brand heavy-equipment requirements, including Komatsu, Cummins and Caterpillar-related products, helping mining customers simplify international sourcing.

For mixed mining fleets, this can be more valuable than buying one isolated machine from one isolated supplier.

What Should You Check Before Buying a Used HD785-7?

Before purchasing a specific used Komatsu HD785-7, inspect at least the following:

Engine

Check cold start, smoke, oil pressure, blow-by, leaks and operating temperature.

Transmission

Check shifting quality, abnormal noise, operating temperature and service history.

Retarder and Brakes

Verify braking performance and inspect for abnormal temperatures or warning codes.

Frame

Inspect major structural and high-stress areas for cracks, repairs or deformation.

Dump Body

Check wear, impact damage, liners and hoist-cylinder condition.

Tires

Mining tires represent a significant operating cost. Check size, remaining tread, damage and matching between positions.

Electronic System

Check monitoring data, warning codes and available operating history.

Serial Number

Use the machine serial number to confirm configuration and parts applicability.

A low purchase price can become expensive very quickly if the truck requires major drivetrain, brake or tire work immediately after delivery.

What Information Does GRT Need to Quote an HD785-7?

To receive a useful quotation instead of a generic price, send:

Destination country
Required quantity
New or used requirement
Preferred production year
Maximum acceptable operating hours
Mining application
Material being hauled
Haul distance
Maximum road grade
Existing excavator or loader model
Existing truck fleet
Required spare-parts package

This allows us to understand both the purchasing requirement and the operating requirement.

Request Komatsu HD785-7 Availability and Quote

Tell GRT what your mine needs to move.

We will help you evaluate the machine, configuration and supply requirement around your actual project.

Frequently Asked Questions About the Komatsu HD785-7

What is the payload of the Komatsu HD785-7?

The Komatsu HD785-7 is a 91-tonne rated payload mining dump truck with a heaped body capacity of approximately 60 m³ SAE 2:1.

What engine is used in the Komatsu HD785-7?

The HD785-7 uses the Komatsu SAA12V140E-3, a 12-cylinder diesel engine with up to 895 kW / 1,200 HP gross output.

What is the maximum speed of the HD785-7?

The published maximum travel speed is approximately 65 km/h.

What type of truck is the HD785-7?

The HD785-7 is a mechanical-drive rigid mining dump truck designed for high-volume material haulage.

Is the HD785-7 suitable for steep mine roads?

The HD785-7 combines high engine output with a four-wheel oil-cooled retarder and automatic retard speed control. Actual suitability should still be calculated using the specific road gradient, truck weight, haul distance, altitude and operating conditions.

How should I compare the HD785-7 with another mining truck?

Do not compare only payload and horsepower.

Compare:

payload achieved
cycle time
fuel per ton
loading time
grade performance
tire consumption
maintenance cost
availability
parts support.

These factors determine the actual cost per ton.

Can GRT supply spare parts after the truck is delivered?

GRT supports sourcing of heavy-equipment, diesel-engine and related spare parts. Parts applicability should be confirmed using the exact machine serial number and part information.

What information should I send for an HD785-7 inquiry?

For the fastest evaluation, provide your destination country, quantity, application, haul distance, maximum grade, material type, loading equipment and required machine condition.

One Truck Specification Does Not Determine Mine Productivity

A productive haulage system depends on the complete relationship between:

excavator productivity

truck payload
loading time
haul distance
road grade
dumping time
fleet availability.

The Komatsu HD785-7 provides the truck capability.

The mine determines whether that capability becomes profit.

Choose the truck around the haul cycle — not around the brochure.

Talk to GRT About Your Komatsu HD785-7 Project

Send us your:

mine application + material + haul distance + gradient + loading equipment + required quantity

and request an HD785-7 quotation based on your actual operating requirement.

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Komatsu HD785-7 Mining Dump Truck | 91-Ton Hauler | GRT

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