95XF: more than a makeover
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• Given the cost of launching a new heavy truck, it's hardly surprising that most manufacturers usually only do it every 10 years. Then they have to make regular improvements to driveline and cab interiors. That's very much the case with the 95 Series. But don't be fooled, the 95XF is more than just a makeover.
For a start it has an all-new 12.6-litre engine, described in last week's CM, along with an improved cabin and facelifted front end. There are also many less apparent changes that will be welcomed by operators and workshops.
Daf has looked hard at reducing downtime, not least through component design. The XF engine is said to be 20% more durable than the 11.6-litre WS diesel it replaces. On the 95XF the maintenance is time-based, at one day or seven hours per year. Using mineral oils, drain periods can be set at 50,000Iun. With a full synthetic that figure is doubled.
The 12.6-litre engine's crankshaft is produced to a "stepped die" principle, being forged directly in the correct shape. The result is said to be a truer, better balanced forging with thicker webs. Daf has also developed a conrod with a tapered profile at the top so the biggest bearing surface is where it's needed—on the downstroke, The plastic cooling fan is now gear, rather than belt-driven. This not only reduces noise but is virtually maintenance free.
Daf has stuck with drum brakes, on the grounds that drum linings last up to 30% longer than disc pads and that drums themselves last as much as 65% longer than discs.
There's also been some tidying up on the 95 chassis, with cross-members repositioned and wiring and piping channelled through conduits to prevent chafing. The cab tilt mechanism has also been repositioned following customer feedback.
At the front, the 95's steel bumper sits proud of the bodywork a la 85 Series, minimising "collateral damage" in the event of a minor knock. The step surrounds are also made of flexible "bucket" plastic. The net result of all these changes is a truck with 25% lower maintenance costs and a warranty period of two years.