AGNEE CAST IRON SERIES WORM GEAR BOXES
SOLID FOOT & ADAPTABLE WORM SPEED REDUCERS
Installation and Maintenance

Changing Handing

When changing the handing of the slow speed shaft extension, the shaft complete with worm wheel, bearings etc. should be reversed as a unit. It should be appreciated that this has the effect of reversing the offset of the wheel relative to the worm. When changing the slow speed shaft handing of V type (Vertical Type) units it should be noted that the position of the wheel relative to the case must not be changed; it is necessary therefore to press the wheel from the shaft. The position of the shaft in relation to the worm wheel must be reversed. The end covers should be located in their respective positions. It is necessary to check contact markings on the worm wheel teeth and if any axial adjustment of the worm wheel is necessary, it can be effected by means of the shims between end covers and bearing housing which should be moved from one side to the other. It is essential that the top half of the gear case be replaced in its original position.

The contact marking is checked by painting the worm with red lead of Prussian Blue and rotating the worm by hand while applying a small braking pressure to the wheel, also by hand.

The correct marking should be slightly heavier on the "leaving side" of the teeth, relative to the direction of rotation of the worm, so as to provide "lead in" for the lubricant and to avoid concentration of pressure on the entering side as this would affect the smoothness of operation. This arrangement is shown in the diagrams. When the correct wheel setting has been reached on the H type (Horizontal Type) speed reducers, the oil scraper clearance relative to the worm wheel should be set at 0.25 mm to 0.38 mm.

If Gearbox is dismantled for maintenance, while re-assembling care should be taken to gently scrape the joint faces and apply 'LOCTITE FLANGE SEALANT SUPERFAST 574' joint compound on faces of cases and covers and catchers of all type units. But for sizes H/O 1000 and above paper packings of size supplied by AGNEE to be used between two halves of the case joints.

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