Maintenance
Frequency of maintenance
These switches are applied under widely varying operating
and climatic conditions, therefore, maintenance intervals
are best determined by the user based on actual operating
experience. To assure proper operation, switches must
be maintained when they have performed the equivalent
of a complete operating duty cycle and before the
dielectric strength has deteriorated below prescribed
levels. In the absence of specific operating experience,
Eaton recommends the switch be inspected and serviced
every 1200 operations or three years, whichever comes
first. In no case should the service interval, between
periodic maintenance and inspection, extend beyond 1200
operations.
Periodic maintenance inspection
Each periodic maintenance inspection should include at
least the following:
1. By-pass and remove the switch from service.
2. Inspect external components.
A. Clean the bushings and inspect for chips, cracks
and breaks. Replace as necessary, following proce-
dure in "Shop Repair Procedures—Bushings" sec-
tion.
B. Check for paint scratches and other mechanical
damage. Paint to inhibit corrosion.
3. Perform a dielectric withstand test to determine the
insulation level. Follow procedures in "Insulation Level
Withstand Tests" section.
4. Loosen the head bolts and remove the mechanism
from the tank. Be careful not to damage the gasket
if the tank and head must be pried apart to break the
seal.
5. Allow the oil to drain off the mechanism.
Terminals
Stationary
Contacts
Actuator
Housing
Head
Casting
Cover--
Clamped
Bushings
Lifting
Strap
Moving Contacts
Contact
Structure
Operating
Lever
Sleet
Hood
Figure 1. Untanked Type NR oil switch.
Operating Shaft Drive Lever
Elastic Stop Nut
Drive Lever
Terminal Strip For
Customer Connections
Drive Motor
Selector Switch
Closing Spring
Figure 2. Standard actuator mechanism with auxiliary
switch option.
5 Pin / 3 Conductor Or
6 Pin / 6 Conductor
Receptacle
White Motor Lead To
Terminal G
Red Selector Switch
Lead To Terminal 2
Black Selector
Switch Lead To
Terminal 3
Pin
CAUTION
This equipment requires routine inspection and
maintenance to ensure proper operation If it is not
maintained, it can fail to operate properly. Improper
operation can cause equipment damage and possible
personal injury.
G105.1
3
TYPE NR OIL SWITCH MAINTENANCE INSTRUCTIONS
MN230001EN February 2016
