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LARK 400 SERIES AIR MOTORS FOR STRAIGHT TUBES LARK 400 series air motors are for use in lightly scaled condenser or heat exchanger tubes or any straight tubes from 5/8" up to 17/8" I.D. Cleaners may be used with a combination of solid connectors, or universal couplings, in conjunction with LARK drill heads, expanding wire brushes, and boring tools. All LARK 400 series air motors are made from high tensile steel, hardened and ground to close limits. Paddles are made from close grained resin bonded fabric, which reduces friction and increases motor speed. Removable internal machanism is of slip-fit construction, which permits ease of disassembly.	LARK 500 SERIES AIR MOTORS FOR CURVED TUBES LARK 500 series air motors are effective in cleaning sharp bends or sets in tubes from 11/16" up to 2 1/8" I.D. These motors are basically the same as for the400 series but with a reduced length so as to allow easy passage of the cleaner around tube bends. Materials are of the same high standard used on the 400 series, and these motors may be quickly taken to pieces, without the need for special tools. Starting as for all LARK air motors is iintantaneous. This improvement is due to patented features incorporated on the motor design which have resulted in added speed and power.

LARK 1000 SERIES AIR MOTORS FOR CURVED TUBES

LARK 1000 series air motors are designed for use in cleaning curved tubes from 2 1/8" up to 4 3/4" I.D.

Together with the drills, universal couplings and cutter heads, these motors will provide a fast and thorough cutting action through all sections of the tube deposit.

The combination of drill head and universal coupling is most widely used for initial tube cleaning and where extremely hard deposits are met drill heads are high manganese castings, and will stand up to very arduous conditions.

LARK 1500 SERIES AIR MOTORS FOR STRAIGHT TUBES

LARK 1500 series air motors have been developed for the removal of severe deposits from oil refinery still tubes from 1 5/8" up to 16" I.D.

These motors are of rugged construction, and the introduction of ball thrust bearings has resulted in both increased speed and power. The motor mechanism is made from high tensile steel, hardened and ground to very fine limits, and all removable parts are of a slip-fit construction. Patented features are incorporated in the motor design, by which the paddles are lightly held in contact with the inner surface of the shell when are pressure is introduced into the motor.

This refinement gives instantaneous starting, together with increased power.