U Series - Wormgearboxes
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SPA SOCIET ITALIANA TRASMISSIONI INDUSTRIALI . >

The manufacturer is at the customers disposal to answer any questions and provide any additional information needed. Inaddition we gladly accept any suggestions to improve this manual to make it more comprehensible and better satisfy the purposes it is designed for. If the equipment changes hands, please send the manufacturer the new ownerҒs address so that he can receive any information, supplements and/or updates. > PROPER OPERATION AND TOP PERFORMANCE OF THE GEARBOX IS OBTAINED ONLY IF ALL THE INSTRUCTIONSGIVEN IN THIS MANUAL ARE CAREFULLY AND COMPLETELY FOLLOWED. This manual deals with...

In compliance with Machinery Directive EEC 89/392 article 4.2 and annex 11/sub B, as the gearboxes dealt with in thiscertificate are incorporated and/or assembled in other machines they are considered componentsӔ therefore:THEY CANNOT BE STARTED UP UNTIL THE MACHINE THEY ARE INSTALLED IN HAS BEEN CERTIFIED THAT ITCOMPLIES WITH MACHINERY DIRECTIVES 89/392/CEE, 91/368/CEE, 93/44/CEE AND 93/68/CEE. Note:The product included in this certificate meets the essential requirements given above and those of the catalogue in force as of the date of production. SITI S.p.A. reserves the right to modify...

The machine is designed for industrial use under normal environmental conditions specified by directive 94/9/EC (ATEX). > The gearbox must not be used in areas whose environmental conditions are different from those specified below.Group II Category 2 G1/G2 Zone D 21-22 > All our gearboxes come with one or more plates that have the identification data stamped on them. > The data given on the plates must be legible at all times. Clean them on a regular basis. If a plate is worn and/or no longerlegible, even if just one item, contact the manufacturer to obtain a replacement plate. When...

The worm gearboxes are delivered entirely factory assembled. Only specially trained personnel are authorized to install,assemble and start them up. > In order to install the gearbox, carry out the operations given on the confirmation before hand:?Make sure the structures are adequate in relation to the actions and reactions deriving from use of the gearbox.?Make sure the installation site is adequate and enough space is available. Preparation > Always check the goods to make sure they were not broken or damaged during shipment before handling the gearbox. Danger!The gearbox is delivered...

Make certain the following requirements are observed when installing the gearbox:During installation the following must NOT be present: potentially explosive atmosphere, oils, acids, vapors, radiation. The position in which the gearbox is installed can be changed only after contacting the manufacturer. The gearboxshall not be considered in compliance with the ATEX directive if the manufacturer is not contacted. Plastic inserts should be placed between the gearbox and drive (connection between different metals) if there is risk ofchemical corrosion. In addition, use plastic washers with the...

must not exceed50 C ( differential value ) in relation to the room temperature.If this temperature (differential value) is exceeded, immediately stop the gearbox and contact the manufacturer. Measure the oil and surface temperature Checks to be performed The highest allowable surface temperature given in this manual was determined under normal environmental conditions. Even slight changes in these conditions (example: with service factors = 1) may considerable affect the temperature. When starting the gearbox, the surface temperature must be measured under maximum load. Off-shelf...

Checks to be made The charts given below list all the operations that have to be checked while a gearbox is running in potentially explosiveatmospheres as specified by the ATEX100a directive. During operationCHECK Measure the surface temperature after approximately three hours of operation. It must not exceed 50 C ( differential value ) in relation to the room temperature.If this temperature (differential value) is exceeded, immediately stop the gearbox and contact the manufacturer. >

The maintenance schedule includes routine and periodic operations. Routine maintenance refers to operations during whichthe operator and/or specially trained maintenance workers have to inspect and check the parts. When performing periodic maintenance the operators have to replace, adjust and lubricate parts. The manufacturer holds specific training courses and provides publications to fully instruct the maintenance staff on how to perform the jobs correctly and in complete safety. > Periodically check the outer surfaces of the gearbox and the cooling air passages for cleanliness. Regularly...

6.4 MEASURING THE OPERATING TEMPERATURE > Wherever possible, suitable instruments should be used to measure the externaltemperature of the gearbox housing. As, under regular operating conditions the temperature inside the gearbox increases 15 - 20 C compared to the outside temperature, the housing normally becomes too hot to touch. It is therefore wrong to assume that the gearbox is too hot just because it cannot be touched. In fact, it cannot be touched as soon as the temperature goes above 50 аC. It is important to check that once the gearbox has reached the normal speed the operating...

?do not block the ring seal axially or apply too much load;?always use suitable tools to avoid damaging the seal lip with threads, grooves, sharp edges or keyways; ?always cover the seal lip and the seat on the shaft when repainting the gearbox. All the precautions mentioned above need to be taken in order to prevent the ring seal from becoming dry especially when the shaft first starts to rotate. If the seal becomes dry, the temperatures in the area where it comes into contact with the shaftbecome too high immediately damaging the seal material and causing the lip to harden, crack and...

For gearboxes and accessoriesScrew threadingCast and steel twistingAluminium twistingClass 8.8moment (Nm)moment (Nm) M 4 2,92,3 M 5 64,8 M 6 108 M 8 2520 M 10 4939 M 12 8669 M 14 135108 M 16 210168 M 18 290232 M 20 410328 >