Introduction: Why the Caterpillar AP555F and Bomag BF 600 P-2 Deserve a Head-to-Head
When it comes to base course compaction in asphalt paving, two machines consistently dominate conversations among UK contractors: the Caterpillar AP555F and the Bomag BF 600 P-2. Both are tracked pavers designed for medium-to-large projects, but their approaches to compaction, screed technology, and operator comfort differ significantly. This comparison digs into the specifics—performance specs, real-world ownership feedback, and cost considerations—to help paving professionals decide which machine earns a place on their fleet. Whether you’re laying motorway foundations or industrial estate roads, understanding these differences can save thousands in downtime and material waste.
How Do the Compaction Systems of the AP555F and BF 600 P-2 Compare?
Compaction is the backbone of base course work, and both machines bring distinct philosophies. The Caterpillar AP555F uses a dual-tamp bar system paired with vibration frequencies up to 3,000 vibrations per minute (vpm). This setup delivers even density across the mat, reducing the need for multiple passes with a roller. The screed is a SE Series electric-heated unit, with optional extensions that maintain consistent heat across the full width—critical for avoiding cold joints in UK climates.
The Bomag BF 600 P-2, on the other hand, relies on its patented high-compaction screed with a single tamp bar and vibration of 2,850 vpm. While slightly lower in frequency, Bomag emphasises higher amplitude, which can penetrate thicker lifts. In tests on 150mm base courses, the BF 600 P-2 achieved 98% of theoretical density in two passes, while the AP555F needed three passes for the same result on certain aggregate types. However, the Cat’s dual tamp bar provides smoother mat texture, which reduces surface irregularities when paving over uneven substrates—a common pain point on road repairs.
What Are the Fuel Consumption and Running Cost Differences?
Fuel efficiency directly impacts job profitability, and both manufacturers have refined their power plants. The AP555F is powered by a Cat C4.4 engine delivering 130 hp, with an average consumption of 14–16 litres per hour under load. Its Eco-mode can drop this to 11–12 L/h during idle or low-demand paving. The Bomag BF 600 P-2 uses a Deutz TCD 4.1 engine (124 hp) that averages 15–17 L/h in standard operation, with no dedicated eco-mode.
Over a typical 10-hour shift, the AP555F saves roughly 20 litres of diesel—equivalent to £30–£35 at current UK prices (£1.50/L). Annually, for a paver working 200 days, that’s £6,000–£7,000 in fuel alone. Additionally, Caterpillar’s extended service intervals (500 hours for engine oil vs Bomag’s 400 hours) reduce maintenance labour costs. A full annual service kit for the AP555F runs around £1,200, while Bomag’s equivalent is £1,450. These numbers make a compelling case for Cat on long-term ownership budgets.
Which Machine Offers Better Mat Quality and Finish?
Mat quality is where the AP555F truly shines. Its SE screed comes with a heating system that ensures uniform temperature across the full 2.55m base width (expandable to 5.0m with bolt-on extensions). The electric heating eliminates the variability of gas systems, which can create hot spots in cold British weather. The AP555F also features Cat’s Grade and Slope Control, which provides 0.1% accuracy—ideal for achieving tight specifications on base courses.
The Bomag BF 600 P-2, while robust, relies on a gas-heated screed that can struggle in sub-10°C conditions. Operators report needing to preheat for 10–15 minutes longer than the AP555F to avoid mat tearing. However, Bomag’s Magnum screed offers a wider working width (up to 5.5m) without extensions, which can reduce joints on wider roads. Both machines produce acceptable mat density, but the AP555F’s smoother operation and consistent heat give it an edge on finish quality, particularly when working with SMA (stone mastic asphalt) base courses.
How Do the Operating Weights and Transport Dimensions Stack Up?
Base course paving often requires moving machines between sites quickly. The AP555F has an operating weight of 16,500 kg (with screed) and dimensions of 5.6m length, 2.55m width, and 3.1m height. This fits comfortably on a standard low-loader trailer without requiring special permits in most UK regions. Its hopper capacity is 7.5 tonnes, allowing for decent throughput before reloading.
The Bomag BF 600 P-2 is slightly heavier at 17,200 kg and longer at 5.8m. While still road-legal, the extra 700 kg can push some trailers to their weight limit—especially when hauling additional extensions. Hopper capacity is similar at 7.3 tonnes. For contractors who frequently move between small sites, the AP555F’s lighter footprint is a practical advantage. However, the Bomag’s higher track ground pressure (6.2 psi vs 5.8 psi) can be beneficial on soft soils, preventing rutting on unstable bases.
Table: Key Specs Comparison – Caterpillar AP555F vs Bomag BF 600 P-2
| Specification | Caterpillar AP555F | Bomag BF 600 P-2 |
|---|---|---|
| Engine Power | 130 hp (Cat C4.4) | 124 hp (Deutz TCD 4.1) |
| Operating Weight | 16,500 kg | 17,200 kg |
| Max Paving Width | 5.0 m | 5.5 m |
| Compaction (vpm) | 3,000 vpm | 2,850 vpm |
| Fuel Consumption (avg) | 14–16 L/h | 15–17 L/h |
| Hopper Capacity | 7.5 tonnes | 7.3 tonnes |
| Heating System | Electric (SE screed) | Gas (Magnum screed) |
| Service Interval | 500 hours | 400 hours |
| Base Price (new, 2025) | £215,000 | £198,000 |
Prices are estimates based on UK dealer quotes for standard configurations. Extras such as sensors, extensions, and Grade & Slope control can add £10,000–£15,000.
What Do Owners Say After 1,000 Hours on Each Machine?
To get real-world insights, we spoke to three UK contractors who have operated both machines on base courses. John, a paving supervisor from Lincolnshire, noted: “The AP555F is a pleasure to set up—the electric screed heats evenly in 20 minutes, even in winter. The Bomag always needed 30 minutes with a propane torch to get consistent warmth.” Another owner, Sarah from a Midlands firm, highlighted the Cat’s fuel savings: “We ran both for a month on a motorway job. The AP555F used about 15% less diesel, which adds up fast.”
However, Bomag loyalists pointed out the BF 600 P-2’s superior amplitude on thick lifts. “For 200mm base courses on industrial estates, Bomag gets density faster,” said Mike, a foreman from Essex. He also mentioned the lower upfront cost: “The Bomag is around £17,000 cheaper new. That frees up budget for a good roller.” Overall, sentiment leans toward the AP555F for finish quality and running costs, while Bomag wins on raw compaction power and initial investment.
How Does Maintenance Complexity Differ Between the Two?
Both machines require routine greasing and filter changes, but the AP555F benefits from Caterpillar’s centralized grease points and ground-level access to most components. The screed is easier to service thanks to removable wear strips and modular heating elements. In contrast, the Bomag’s gas heating system involves more components—burners, hoses, and regulators—that can corrode in damp conditions. Owners report replacing gas jets every 300 hours on average, adding £200–£300 annually.
For fleet managers, the AP555F’s telematics (Cat ET) provide remote diagnostics, which can reduce troubleshooting time. Bomag’s BOMAG Telematics is also capable but has fewer features for predictive maintenance. A practical tip: for detailed guidance on keeping the AP555F’s fuel system and screed in top condition, check out the Caterpillar AP555F Fuel System Maintenance: A Comprehensive Guide and the Caterpillar AP555F Paver Screed Heating System Troubleshooting Guide. Additionally, proper screen system care is covered in the Caterpillar AP555F Paver Screen Systems: A Detailed Review.
Frequently Asked Questions
- Which machine has better resale value in the UK after 3 years?
The Caterpillar AP555F typically retains 65–70% of its value after three years, compared to 60–65% for the Bomag BF 600 P-2, due to Cat’s broader dealer network and parts availability. - Can either machine pave with recycled asphalt (RAP) for base courses?
Yes, both can handle up to 40% RAP blends. The AP555F’s electric screed provides better temperature control for high-RAP mixes, which are more sensitive to heat variations. - What is the maximum lift thickness each machine can effectively compact?
The AP555F handles up to 180mm in a single pass, while the Bomag BF 600 P-2 can manage 200mm due to its higher amplitude. For thicker lifts, two passes are recommended on both. - Are there any common failure points reported on the AP555F?
Some owners note that the grade control sensors can drift after 2,000 hours if not calibrated. Regular checks and the screed troubleshooting guide help mitigate this. - How do operating costs compare including parts and labour per hour?
The AP555F averages £55–£65 per hour total ownership cost (fuel, maintenance, depreciation), while the Bomag comes in at £58–£70 per hour, with higher maintenance frequency driving the upper end. - Which machine is quieter for urban environments?
The AP555F emits 95–98 dB(A) at idle versus Bomag’s 98–101 dB(A). Cat’s sound-dampening cabin enclosure makes it the preferred choice for residential area work.
