H4-SV-20-D al requirements As a full subsidiary of Siemen Helical gear reducer H4

Flender/Flender Gear Units/Helical gear reducer H4

filter 2 Pressure monitor 4 Double changeover filter detailed view of the gear unit can be obtained from the drawings in the gearunit documentation. In the case of gear units with addon oilsupply system, before starting the unit up the pressure monitor must always be connected so as to be ready for operation. Depending on the order specification and application, the flange pump may be replaced with motor pump. When operating and servicing the components of the oilsupply system, observe the operating instructions of the components. For technical data, refer to the data sheet and/or the list of equipment. 5.6 Shaft bearings All shafts are mounted in rolling bearings. 5.7 Shaft seals Radial shaftsealing rings, labyrinth seals, Taconite seals or special seals (oildam pipe, centrigual disk) at the shaft outlets prevent oil from escaping from, or dirt from entering into the gear unit. 5.7.1 Radial shaftsealing rings Radial shaftsealing rings are the standard type of seal. They are fitted preferably with an additional dust lip to protect the actual sealing lip from external contamination. Use in an area with much dust is not possible. Fig. 3: Radial shaftsealing ringTo be connected as opener orcloser, as required.0.5 bar 4 / 1BA 5 en 0/2.7.2 Labyrinth seals Labyrinth seals are noncontacting and avoid wear to the shaft. They therefore require no maintenance and ensure favourable temperature characteristics. They can be used only with certain transmission ratios and minimum speeds. Check in the spare parts drawing and the spare parts list whether the gear unit is provided with labyrinth seals. Fig. 3: Labyrinth seal For reliable operation, this type of seal requires stationary, horizontal positioning in splashfree and relatively dustfree environment. Overfilling of the gear unit can cause leakage, as can oil with high foam content. 5.7.3 Taconite seals Taconite seals were specially developed for use in dusty environment. The penetration of dust is prevented by combina