NEUTRAL SAFETY SWITCH INSTALLATION

TM 10-3930-623-12

6-58.

ENGINE

MOUNTED

ELECTRICAL

3. Disconnect the shift linkage and control valve

COMPONENTS, REMOVAL AND INSTALLATION.

plunger from the pivoted lever plate which operates the

These units not previously covered are shown in figure

roller of the sensitive switch.

6-3. Since all attaching parts and connecting leads are

4. Remove the attaching screws which hold the

exposed, and no special techniques are involved,

bracket to the top of the transmission and take the unit

remove and replace them using the obvious procedures.

from the truck.

1. Procedure for Testing Ignition Coil.

6-56. NEUTRAL SAFETY SWITCH ADJUSTMENT. If

the sensitive switch has been removed from the

2. Test the coil for grounded or open circuits by

assembly, it must be adjusted before putting it into

using a test lamp as follows:

service. To adjust, proceed as follows:

a. Check primary circuit by placing the test

points on the two primary terminals. If the lamp does not

1. With the switch roller contacting the flat area of

light the primary circuit is open and the coil must be

the striker plate, out of the detent, as shown in figure

replaced.

6-4, adjust the switch position just to the point where a

b. Check the secondary circuit by placing

click is heard in the switch.

one test point in the high tension terminal and the other

2. At this point measure the distance between the

test point on one of the primary terminals. The lamp will

switch body and the roller arm with a feeler gage.

not light but sparks will be noted as the test point is

rubbed over the terminal. If no sparks occur the

3. Move the switch 3/32 inch toward the striker

secondary circuit is open and the coil must be replaced.

plate, as measured with a feeler gage at the same point

as in step 2. above, and lock sensitive switch in position.

6-59. RADIATOR.

6-57. NEUTRAL SAFETY SWITCH INSTALLATION.

6-60. REMOVAL.

1. Attach the mounting bracket to the transmission

1. Remove

radiator

cover

plate

from

with attaching parts previously removed.

counterweight.

2. Connect the shift linkage and control valve

2. Drain coolant and disconnect all hoses at

plunger to the lever plate.

radiator. Slide hose clamps down hoses for storage if

the clamps are reusable.

3. Connect the two electrical leads to the terminals

of the switch and check that the starter can only be

3. Remove two screws, and four washers securing

energized when the shift, lever is in the neutral position.

the radiator at each side and take the radiator carefully

When adjustment has been checked as satisfactory,

from the truck.

replace truck floor plate.

Figure 6-4. Neutral Safety Switch Adjustment

6-8