Two new HD+ models of the Hamm HD+ tandem roller line — introduced in 2010 – were seen for the first time at ConExpo-Con/Agg.

At Bauma 2010 in April, Hamm Compaction Division rolled out an all-new 66-in. (167.6 cm) tandem roller, in two different weight classes. The new HD+ 90 features an operating weight of 10 tons (9 t), and the HD+ 110 has an operating weight of 11.5 tons (10.4 t).

Both models offer a variety of different options, including conventional vibration, high frequency compaction at 4,020 vpm, exclusive Hamm Oscillation compaction, a combination option and even a split-drum option.

They join the HD+ 120 and HD+ 140 rollers – introduced at World of Asphalt 2009 — with their respective operating weights of 13.2 and 15.4 tons (12 and 14 t), and respective drum widths of 78 and 84 in. (198 and 213 cm).

Each size compactor is available in at least three models: the HD+ 90, 110, 120 or 140 VV, with standard vibration in both drums; the HD+ 90, 110, 120 or 140 VO, with vibration in the front and exclusive Oscillation compaction in the rear; and the HD+ 90, 110, 120 or 140 VV HF, offering high-frequency vibration to 4,020 vpm.

Separate Adjustments for Drums

The new HD+ line also offers separate adjustment of frequency and amplitude in both drums. This allows the tandem rollers to be precisely set to the requirements of new specialty or high-performance asphalts.

“These machines have been developed specifically to meet the criteria of the North American contractor,” said Richard Evans, vice president-sales, Hamm Compaction Division of Wirtgen America Inc.

The fully adjustable seat — with integral control levers — moves together with the operator’s console completely from side to side and swivels through 180 degrees for much better control and visibility, particularly to the drum edges.

“In addition, if you are a big guy, the steering column tilts up out of the way when you are climbing in or out of the seat,” Evans said. “Also, the drive levers are wide, so you have plenty of room for your legs.”

The HD+ features additional operator conveniences such as large cup holders, and an adapter to enable the operator to charge a phone, or even plug in a refrigerator, which can be stored on the large cooler tray.

The Plus models feature Hammtronic operation as standard, providing engine management control for fuel savings, programmable speed control and the ability to independently control vibration frequency and amplitude to either drum.

Drum-mounted halogen lights are standard for improved illumination to all four drum edges and either halogen or xenon light options are available to mount to the ROPS structure.

Unlike other machines which require physical movement of weights on the side of each drum, amplitude and frequency adjustment on the HD+ models can be done by the operator on the control panel.

Also unique is the HD+ Series’ offset capability, which on the HD+ models is close to 7 in. (17.8 cm)

“We can roll around a curb without risking the damage by the rear drum and now, with the extra 3 inch offset over the older model, we now have enough for a good roller operator to pinch a joint,” Evans said.

That means an operator can keep the front drum on the hot material and offset the rear drum so it can bridge between the pre-compacted hot material and the cold joint, potentially saving a pass for higher productivity, and avoiding travel in the other lane of traffic, for enhanced safety, according to the manufacturer.

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