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Figure 3-1. Air filter removal
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TM-5-6120-250-12 Substation Trailer Mounted 500 KVA AC 4160-416Y/240V 208Y/120V 3 Phase 50/60 Hertz Manual
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Figure 3-3. Switch blade
3-10. Load Break Switch
a. Check all nuts, bolts, cotter pins and terminal
connection for tightness.
b. See that all bearing surfaces of the mechanism
have been lubricated.  If lubrication is needed do as
follows:
(1)  Sleeve Bearings (Operating Rod Ends,
Auxiliary Blade Hinge, Release Hook, etc.)-A light
application of SAE 20-30 oil.
(2)  Roller and  Needle
light
application of SAE 20-30 oil.
(3)  Worm
and Wheel Miter Gears-Apply
D50H15 grease.
c. To check operation of switch it must be operated
slowly, with the power springs blocked.
Use the
following procedure to block the power springs.
(1) Remove the rear bolt from lower position I(,
fig. 3-2.) of the spring stop (3) located on the upper
right angle frame.
1. Spring stop bolt, lower position
(2) Rotate the stop until it is vertical. Insert the
2. Spring stop bolt, lower position
bolt removed from position I in location 2 and tighten.
3. Spring stop
4. Driving crank
(3)
Using  the  operating  handle  rotate
5. Spring blocking pin, inserted
counterclockwise direction (direction of close) until the
6. Driving lug
spring yoke on the right contacts the stop.
7. Buffer rubber
8. Buffer stop
(4)
Remove operating handle and insert
9. Operating rod
maintenance handle (13) on main crank shaft (12).
10. Operating rod crank
Screw the blocking pins attached by chains to
11. Operating hub
maintenance handle 113) in the holes 15 spring blocking
12. Main crank shaft
pin inserted) of left and right spring guides. The springs
13. Maintenance handle
are now safely blocked. The maintenance handle will
open and close the switch slowly for inspection
Figure 3-2. Spring drive mechanism.
purposes.
3-7

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