KRACHT External gear pumps KP 1series 2, due to their structure (design principle) and the materials employed, are ideal for use under the most extreme operating conditions. Important modular elements (see sectional drawing) are the housings and flanged covers - both made from grey cast iron or cast iron - can be highly loaded dynamically making them insen- sitive to pressure peaks and continuous vibrations. Large-surface-dimensioned, PTFE-Pb coated, bronze plain bearings on steel backs in the housing and flan- ged cover support the micro-finish ground bearing journals of the gear, which comprises the drive-shaft wheel and bolt wheel. To realise optimum running properties, the tooth flanks of the gear, which are manufactured out of casehardening steel, are ground.