The clash of titans, comparing a CAT 777D with a CAT 777F


As IJ Plant has received all the parts for a CAT 777D, which you can find by contacting us, we thought it would be a good idea to review its strengths and features in comparison to the 777F. Both are great off-highway trucks, both carry approximately the same Total Gross Machine Operating Weight of 163,000kg (the 777D gets the slight edge on that with 163, 360kg) and both have a Nominal Payload Capacity of 100 tons, so what makes them different?


Starting with the engine, there are some major differences we can find. The 777D runs on a CAT 350B EUI engine, which allows for the power and reliability necessary to perform in demanding situations, while giving the machine good fuel efficiency, lower emissions and lower operating costs. The 777F differs with a CAT C32 ACERT, which, while also reducing emissions without the need of after-treatment, means having a turbocharged, after-cooled 12-cylinder engine with more horsepower and faster response time.


Both operate on a seven-speed power shift transmission, as well as containing the same Power Train Integration: the CAT Data Link that electronically combines engine, transmission, brake and operational information to optimise the trucks’ performances. You can’t say they’re not modern machines!


The 777D has an ergonomic cab for its operator’s station, designed for comfort and ease of operation. It also features an advanced monitoring system that keeps the 777D running at peak productivity. Meanwhile, the 777F features an all-new operator station with enhanced visibility, increased operator space and ergonomically designed controls. While similar, one wonders if the latter’s updated operator station might prove more effective than the former.


But let’s pump the brakes on similarities for a bit and talk about the differing brake systems between the two. The 777D’s CAT rear oil-cooled, multiple disc brakes offer exceptional, fade-resistant braking and retarding in all haul road conditions. The 777D features an Optional Automatic Retarder Control and Traction Control Systems as well for optimum braking efficiency. On the other hand, the 777F offers hydraulically controlled brakes, reducing maintenance costs and improving operator control and modulation.


If pistons are where your heart is at then this news will excite you. The 777F is fitted with a Single-Piece Piston Design, with new single-piece forged steel pistons that carry an integrated forged steel skirt to be more robust and withstand high engine heat and pressure. The 777D’s two-piece pistons come with a deep bowl, low volume crevice design to enhance combustion and fuel efficiency while lowering emissions. Although, the 777F’s corrosion-resistant, stainless steel top ring reduces ring, groove and liner wear, providing a longer life for the truck.


Whether you’re a fan of the 777D or 777F, it’s clear to see that both function for very different jobs. Within each gear and combustion, each towering wheel and operator station, the fine molar details that separate these two designate similar but entirely different natures. It is up to us to take charge of these facts and move forward with them, or perhaps having these two trucks compete could make for an interesting experiment?

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