Servicing & Maintenance
The SMF
® sintered metal filter and the systems based on it are exceptionally reliable in operation, low on maintenance and also benefit from a long service life. The pocket-
type construction of the SMF
® prevents clogging such as that familiar, for instance, from conventional ceramic filters with their honeycomb structure. What's more, the ash holding capacity of the SMF
® is three to four times higher than that of a conventional ceramic filter system This significantly increases the mileage before an HJS system requires cleaning, including in the case of older buses that suffer from particular high oil consumption. For, whereas a ceramic filter requires cleaning after just a short period of operation, an SMF
® is capable of several years of operation before maintenance is needed.
This means that by retrofitting an HJS filter system to a vehicle, you can save money over its entire lifetime because the sintered metal filter minimises the running costs for servicing and maintenance as well as the associated downtime costs.
Filter cleaning
In addition to combustible soot particles, filter systems also remove from the exhaust gases all other particulate matter that cannot be regenerated. For the most part, this is ash from burnt engine oil. These residues must be removed from the filter by cleaning.
Cleaning intervals
Experience has shown that an SMF
® system offers three to four times more mileage than a conventional ceramic filter before it has to be cleaned for the first time. Thanks to this considerable servicing advantage, the two largest manufacturers of city buses, for example, have already switched from ceramic filters to fitting HJS SMF
® systems back in 2006. The filter systems can go far longer than 200,000 kilometres (120,000 miles) without having to be cleaned out.
The filter modules are removed and freed of all residues with the aid of a commercially available high-pressure cleaner
DIY - Do it yourself
When a filter needs to be cleaned, this job can be done quickly and easily on the public transport operator's own premises or at the local garage as part of the usual servicing measures. Neither is it necessary to send the systems back to HJS, nor is there any need for complex cleaning equipment. All that's needed to free the filter module of residues is a commercially available high-
pressure cleaner. Thanks to the simplicity of filter cleaning and the fact operators can do it themselves, both the running costs for servicing and maintenance and the associated downtime costs are kept to a minimum.
Public Transport Buses
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