HD785-7 SPECIFICATION (2024)

Komatsu Manual | Saturday, August 25, 2018

Compatible Unit Serial Number : 7001 and up

Introduction:

​The Komatsu HD785-7 continues the tradition for this iconic truck. Known globally as the leading 100 tonne class truck due to its outstanding productivity and reliability, the HD785-7 through latest technology adoption continues to outperform all competitors.

The HD785-7 meets our customer’s demands through superior;

• Payload
• Engine Horsepower
• Component quality and technology

Quality and Reliability to deliver customer outcomes.

Specification Drawing

Machine Model : HD785-7

Serial No. : 7001 and up

Power Train

1. Torque Converter

• Structure :3-element, 1-stage, 2-phase
• Lock- up clutch :Hydraulically actuated, wet-type, multiple-disc clutch

2. Transmission

• Type :TORQFLOW planetary gear. Fully automatic, electrically-hydraulically actuated, force-feed type pump.
• No. of speeds :F7, R2

3. Reduction Gear

• Type :Spiral bevel gear, splash lubrication
• Reduction ratio :3.357
• Differential type :Straight bevel gear, splash lubrication

4.Final Drive

• Type :Planetary gear, splash lubrication
• Reduction ratio :6.333

Steering System

• Type :Fully hydraulic steering system

Suspension

1.Axle type

• Front axle :Independent suspension (Mac Pherson type)
• Rear axle :Full floating

2.Suspension method

Tires

1.Size and No.

2.Tire pressure

Brake System

1.Service brake

• Front Brake :Oil cooled multiple disc brake, Hydraulically controlled
• Rear Brake :Oil cooled multiple disc brake, Hydraulically controlled

2.Parking brake

Hydraulic System

1.Hydraulic pump

- For both steering and work equipment

• Type :Gear pump
• Delivery (at engine rated speed 1,900 rpm) :580 l/min

- For charging torque converter

- For brake cooling

• Type : Gear pump
• Delivery (at engine rated speed 1,900 rpm) : 580 l/min

2. Cylinder

- Hoist cylinder

• Type : 2-stage piston type (only 2nd stage: double-acting)
• No. 1st bore x stroke - 2nd bore x stroke :2 - 215 mm x 1,045 mm - 180 mm x 1,040 mm

- Steering cylinder

• Type : Piston type, double acting
• No. - bore x stroke :2 - 110 mm x 475 mm

Weight Table

Note: This weight table is a guide for use when transporting or handling component.

Fuel, Coolant and Lubricants

• ASTM: America Society of Testing and Material

Notice

Use only diesel fuel.

The engine mounted on this machine employs electronic control and a high-pressure fuel injection device to obtain good fuel consumption and good exhaust gas characteristics. For this reason, it requires high precision for the parts and good lubrication. If kerosene or other fuel with low lubricat-ing ability is used, there will be a big drop in durability.

Komatsu EOS0W30 and EOS5W40 are the most suitable oils.

When it is necessary to improve the lubricating ability of the grease in order to prevent squeaking of pins and bushings, the use of G2-T or G2-TE is recommended.

a. The coolant has the important function of preventing corrosion as well as preventing freezing. Even in the areas where freezing is not an issue, the use of antifreeze coolant is essential. Komatsu machines are supplied with Komatsu Super coolant (AF-NAC). Komatsu Super coolant (AFNAC) has excellent anticorrosion, antifreeze and cooling properties and can be used continuously for 2 years or 4,000 hours.

Komatsu Super coolant (AF-NAC) is strongly recommended wherever available.

b. For details of the ratio when diluting super coolant with water, see "Mixing rate of water and super coolant".

When the machine is shipped from the factory, it may be filled with coolant containing 30% or more

Super coolant (AF-NAC). In this case, no adjustment is needed for temperatures down to -10°C (14°F). (never dilute with water)

When temperature is below -10°C (14°F), adjust the ratio of Super coolant and water, see "Mixing rate of water and super coolant".

c. To maintain the anticorrosion properties of Super coolant (AF-NAC), always keep the density of Super coolant between 30% and 68%.

Mixing rate of water and super coolant