z.3. SB Series Dial Mechanism
The following section is taken from the SB-101 Assembly Manual and describes
installation, adjustment and calibration of the dial mechanism.
z.3.1. Installation of the Spiral Groove Follower Mechanism
1. Refer to Detail 3-7A and install the nylon spiral follower on the dial pointer drive arm. Use a
3-48 x 1/8" screw. Be careful not to over tighten the screw.
2. Mount the dial pointer drive arm on the chassis. Use 6-32 x 3/8" hardware. Position the
screws in the center of the chassis and dial pointer drive arm slots.
3. Refer to Pictorial 3-8 for the following steps.
4. Mount the plastic dial window (#464-30-1), two pilot lamp sockets (#434-44) and the dial
pointer assembly (#100-443), to the dial mounting bracket (#204-553). Use 3-48 x 3/8" flat
head hardware. Be sure to position the plastic dial window and dial pointer assembly as
shown.
5. Mount the dial mounting bracket on the LMO. Use the two top front screws of the LMO.
Position the stud on the rear of the dial pointer into the slot of the dial pointer drive arm.
6. Refer to Detail 3-8A for the following steps.
7. Twist together a 6-1/2" brown wire and a 6-1/2" white wire to form a twisted pair with
approximately 2 turns per inch.
8. At one end of this twisted pair of wires, connect the brown wire to lug 1 (S-1) and the white
wire to lug 2 (S-1) of pilot lamp socket DF.
9. Position the other end of this twisted pair of wires between the dial pointer drive arm and the
front of the LMO. Connect the brown wire to lug 1 (NS) and the white wire to lug 2 (NS) of
pilot lamp socket DG.
10. Twist together an 8" brown wire and a 6-1/2" white wire to form a twisted pair. At the end
where the wire ends are even, connect the brown wire to lug 1 (S-2) and the white wire to
lug 2 (S-2) of pilot lamp socket DG. Bend down lugs 1 and 2 of socket DG so it clears the/
dial painter. The other ends of these wires will be connected later. Install pilot lamps and
pilot lamp shields in pilot lamp sockets DF and DG. Position the shields as shown. Be sure
none of the lugs of the pilot lamp sockets touch any other metal parts.
z.3.2. Installation of Circular Dial on LMO Shaft
Refer to Detail 3-8B for the following steps.
1. Turn the shaft of the LMO fully counterclockwise, against the stop.
2. Start an 8- 32 x 1/4" setscrew in the tapped hole in the hub of the circular dial (#100- 449).
Servicing Procedures Page 69
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