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3.4. Shop Maintenance
This section provides the information necessary to perform shop level repairs of the PV-
250 style relays covered in this manual. In general, relays arriving at the shop for repair
have been checked in the field and have been found to perform unacceptably or have
been physically damaged.
3.4.1. Cleaning and Inspection
Before inspecting the relay and initiating repairs, use a soft cloth to clean the exterior
carefully to remove any dirt or dust that may have collected. A safe cleaning solution of
alcohol and water may be used for removal of accumulated dirt, grease, etc.
Inspect the relay exterior for signs of physical damage, such as cracked or broken
cover, cracked or damaged housing, and damaged and/or missing contact block termi-
nals and indexing pins. If severe external damage is found, a careful inspection of the
interior components should be made for obvious physical damage. Proceed with relay
contact cleaning, using the following recommended cleaning materials.
3.4.2. Recommended Cleaning Materials
The following tools are recommended for cleaning the relay. They are available as a
special cleaning kit (X451646-0901).
Burnishing Tool, P.K. Neuses Co. No. 3-316
Burnishing Tool, P.K. Neuses Co., No. N318 (Heavy Duty)
Paper Strip, strips cut from 67# white Springhill Vellum Bristol Paper
Individual items from the kit are also available by ordering the part number designated
beside each item.
Also recommended (commercially available):
Emory Paper (Wet or Dry): 600 Grit, cut in strips
Alcohol #1 Solvent (Ethyl Alcohol Proprietary 190 or Equivalent)
In the final cleaning procedures outlined in the following
sections, it is recommended that all silver contacts be
cleaned first, followed by all silver impregnated carbon
contacts, to prevent contamination of the silver tips with
residue that adheres to the cleaning tool after cleaning the
silver impregnated carbon contacts.
When using the paper strip, clean the back contacts first and
the front contacts last. Discard the paper strips when dirty.
Copyright 2019
Tool
NOTE
SM 4574F, Rev. 4, March 2019
PV-250 Track Relay
STS USA Part Number
J397187
J397187-001
J793094
3-8
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