The basic gear unit is generally shipped from the factory completely assembled. Mating gears and pinions are carefully assembled at the factory to provide proper tooth contact. Nothing should be done to disturb this setting.

Solid Foundation The reducer foundation should be rigid enough to maintain correct alignment with connected machinery. The foundation should have a flat mounting surface in order to assure uniform support for the unit. If the unit is mounted on a surface other than horizontal, consult the factory to ensure that the design provides for proper tooth contact and adequate lubrication.

The design of fabricated pedestals or baseplates for mounting speed reducers should be carefully analyzed to determine that they are sufficiently rigid to withstand operating vibrations. Vibration dampening materials may be used under the baseplate to minimize the effect of vibrations.

When mounting a drive on structural steel, the use of a rigid baseplate is strongly recommended. Bolt unit and baseplate securely to steel supports with proper shimming to ensure a level surface.

If a drive is mounted on a concrete foundation, allow the concrete to set firmly before bolting down the unit. For the best mounting, grout structural steel mounting pads into the concrete base rather than grouting the gear unit directly into the concrete.

The gear unit inspection covers should be removed and a tooth contact check be performed using a color transfer material to ensure that the contact in the field is the same as when checked in the manufacturer's shop during assembly. This should be done regardless of whether the gear unit was mounted in the field or received on a bedplate.

Leveling If shims are employed to level or align the unit, they should be distributed evenly around the base under all mounting pads to equalize the support load and to avoid distortion of the housing and highly localized stresses. All pads must be squarely supported to prevent distortion of the housing when the unit is bolted down.

Alignment If the equipment is received mounted on a bedplate, it has been aligned at the factory. However, it may have become misaligned in transit. During field mounting of the complete assembly, it is always necessary to check alignment by breaking the coupling connection and shimming the bedplate under the mounting pads until the equipment is properly aligned. All bolting to the bedplate and foundation must be pulled up tight. After satisfactory alignment is obtained, close up the coupling.

Couplings Drive shafts should be connected with flexible couplings. The couplings should be aligned as closely as possible following the manufacturer's instructions. However, many of the coupling manufacturers publish catalog values that are actually "jam angles." A coupling aligned to within four (4) minutes of a degree at operating temperature will operate satisfactorily in nearly any combination of torque and speed within its design limits. Four (4) minutes of a degree is about 0.0006 in/in (0.0006 mm/mm) of engagement separation.

Thrust from the connected equipment can be transmitted across the coupling to the gear. Caution should be exercised to assure that the proper shaft to shaft end spacing is maintained to minimize external thrust force.

Alignment and Bolting The gear unit, together with the prime mover and the driven machine, should be correctly aligned. After precise alignment, each member must be securely bolted and doweled in place. Coupling alignment instructions should be carefully followed. Prior to initial operation, each member must be shallow doweled in place. After the system has been checked at operating temperature, the dowels should be sunk to their proper depth.

Survival Treasure

Survival Treasure

This is a collection of 3 guides all about survival. Within this collection you find the following titles: Outdoor Survival Skills, Survival Basics and The Wilderness Survival Guide.

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