English 5.906-494.0 Rev. 01 (04/11) 13– Grease the inside of the motor shaft with copperpaste.– Grease the outside of the crankshaft with copperpaste.Order no. copper paste (100g): 6.869-087.0 Loosen the two fastening screws of the overflow(HD 25/15-4)1 Valve screw, suction side2 Fastening screws3 Pressure switch4 Valve screw, pressure side Loosen the fastening screws. Carefully pull out the cylinder head using bothhands.The removed cylinder headcross section seal setup, see pump diagram.1 Crown nut2 Disc3 Low pressure seal4 Support ring, low pressure seal5 Support disc, brass6 Disc7 High pressure seal8 Support ring, high pressure seal9 Cylinder head Always replace the entire set of seals. Grease the low and high pressure seals generous-ly with special silicone grease prior to installation.Order no. silicone grease (100 g): 6.288-079.0 Unscrew the valve screws to remove the valvecages. Pull the valve cage out with a pliers.5.4.3 Cylinder head, uninstall