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Installation and Maintenance


Gearboxes are to be rigidly mounted so as to minimize the effect of fluctuating or heavy loads. Always check the alignment after bolting down. After installation and alignment has taken place, properly locate the gear unit by means of dowels at appropriate locations preferably in diagonal direction.

The use of flexible couplings (Love joy / Gear coupling flanges with rubber bushes/tyre couplings) is very important for the improved performance of the gearbox. The couplings are to be lined up to avoid the misalignment of angularity and eccentricity.

Change of Handing

When changing the handing of the slow 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 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 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 (Not applicable for Adaptables).

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 breaking pressure to the wheel 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.

Axial Floats

After re-handing it is essential that shaft and floats be correctly set. The following axial floats for wormshaft and wheelshaft are recommended. They should be checked preferably using a dial

Size Wormshaft (mm) Wheelshaft (mm)
112 0.050/0.100 0.025/0.050
162 0.050/0.100 0.025/0.050
200 0.050/0.100 0.025/0.050
237 0.050/0.100 0.025/0.050
287 0.050/0.100 0.025/0.050
337 0.050/0.100 0.025/0.050
300 0.050/0.100 0.025/0.050
400 0.050/0.100 0.025/0.050
500 0.050/0.100 0.025/0.050
600 0.050/0.100 0.025/0.050
700 0.075/0.125 0.025/0.075
800 0.075/0.125 0.025/0.075

Weekly Inspection

Check the oil level by means of the dipstick or oil level plug and add the recommended lubricant to the level if required
Ensure that breathers are clean and operating properly, if blocked clean the breathing holes otherwise pressure will build up, resulting in oil leakage
Units fitted with grease nipples, add two or three shots of grease from grease gun
Regular oil changes are essential to ensure that the unit gives long and trouble free service, which depends upon the following factors
Oil temperature- under load
Environment- humidity, dust etc
Operating conditions- shock loading etc
Replace the oil as per operating conditions at elevated temperatures- Refer below

Temperature Adaptables Other Units
75 or Less 2500 hrs or 6 Months 5000 hrs or 12 months
80 2000 hrs or 6 Months 3500 hrs or 12 months
90 1000 hrs or 3 Months 1000 hrs or 12 months
Copyright © 2011 M.M.Gears Pvt. Ltd.