FOR MODELS: JGW, JGR AND JGJ
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SECTION 5 - MAINTENANCE
General Introduction
The major components of the frame assembly are the crankcase, crankshaft and bearings,
connecting rods, chain drive system, crossheads and guides, and distance pieces.
A cast-in oil gallery runs the length of the crankcase. Drilled oil passages feed lubricating oil
to the running gear.
Removable end covers, a top cover, and crosshead guide side covers provide generous
access for inspecting and removing internal components. The top cover is made of alumi-
num for easy handling.
Absolute cleanliness, including the use of lint-free wiping cloths, is a necessity during any
maintenance on the compressor. When access covers have been removed, keep the frame
covered to protect the interior from dust except when actually working on the unit. Any com-
ponents that have been removed should be protected from falling objects that might mar or
chip running surfaces.
Whenever the machine is dismantled, gaskets at non-pressure positions are to be carefully
inspected before reuse. Damaged gaskets must be replaced. Gaskets at pressure locations
should be replaced. Always apply an anti-seize lubricant to both sides of the gaskets for
easy removal at a later date. During major overhauls, drain and flush the crankcase.
When opposed throw compressor cylinders are exchanged side to side on a given unit, all
reciprocating components excepting the conn rods must be exchanged. When re-applying
to a throw other than opposed or when reapplying to a different size or class cylinder, the
weight balance must be re-calculated. Contact your packager and/or Ariel Field Service for
more information. To contact Ariel, refer to “Ariel Telephone and Fax Numbers” on page 7-9.
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