BOLT-SOCKET HEAD 8C7587 - Caterpillar

In order to obtain optimum service life from a Caterpillar Engine and its driven equipment, correct alignment between these units is a necessity. This instruction describes the general procedures and requirements needed to successfully install and align Caterpillar Engines with various types of driven equipment. Once the basic alignment procedure is understood, this information can be successfully applied to the installation and alignment of any Caterpillar Engine and any type of driven equipment.The purpose of this Special Instruction is to give a basic understanding of the alignment procedure. This instruction does not replace existing Caterpillar Special Instructions which cover the alignment of specific models and types of driven units. Always use the appropriate Caterpillar Special Instruction and the instructions and specifications from the manufacturers of the coupling and driven equipment to install and align these units. The following is a list of currently available Caterpillar Special Instructions pertaining to alignment.Typical Configurations
In order to correctly align a Caterpillar engine with mechanically driven equipment, a general understanding of the types of configurations of driving and driven units is necessary. Usually two types will be encountered: 1) driven units that are close coupled and 2) driven units that are remote mounted. Close coupled units are ones that are fastened directly to the engine flywheel housing or front accessory drive housing. Remote mounted units are not fastened directly to the engine and are driven from the front or rear of the crankshaft by means of a driveshaft and flexible coupling. Each type of configuration requires a different alignment procedure. Combination configurations (more than one driven unit and/or two engines) can also be successfully aligned once the basic alignment procedures are understood.(A) Close Coupled Units - Type I
The driven unit is fastened directly to the engine flywheel housing or front accessory drive housing and has no external supports for the driven unit. Examples: Clutches, power take-off groups, transmissions and torque converters.(B) Close Coupled Units - Type II
The driven unit is fastened directly to the engine flywheel housing. The supports for the driven unit serve as supports for the rear of the engine. Examples: Single bearing generators and marine transmissions.(C) Close Coupled Units - Type III
The driven unit is fastened directly to the engine flywheel housing or front accessory drive housing. The engine has front and rear supports. The driven unit has its own support. Examples: Single bearing generators, close coupled two bearing generators, marine transmissions and power take-off groups.(D) Remote Mounted Units
Remote mounted units are not supported by the engine. These units can be driven from either the front or the rear of the engine by means of a coupling and a driveshaft. Rear driven units have the coupling located within the flywheel. Front driven units use an external coupling. Examples: Two bearing generators, gears and large marine transmissions.(E) Combination Remote Mounted Units
Combination arrangements may have one engine with several driven units or two engines with one driven unit. Examples: Tandem engine and generator combinations.Principles Of Alignment
(A) Cold Alignment
In high speed applications, at