Load Break Switch

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

Bearings-A

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