RAIL-MOLDBOARD 1504139 - Caterpillar

Illustration 1 g03105237
1/2 inch Solenoid motor terminal nut (42MT models)
Illustration 2 g03105279
1/4 inch Solenoid motor terminal screw (37MT and 41MT models)
Illustration 3 g03106036
1/2 inch Solenoid motor terminal screw (50MT models)
For 42MT and 50MT models, loosen the 1/2 inch nut on the solenoid motor terminal. For 37MT models and 41MT models, loosen the 1/4 inch screw (2) on the solenoid motor terminal.
Illustration 4 g03105317
Starting motor
(1) Solenoid motor terminal nut
(3) Gasket
(4) Lever housing register
(5) Mounting screws
(6) Solenoid
(7) Solenoid ground terminal
(8) Solenoid switch terminal
(9) Screw
(10) Motor field connector strap
Illustration 5 g03105364
Starting motor
(11) Access plug
(12) Plunger nut - 1/2 inch
(13) Shift lever housing
(14) Plunger rod
(15) Plunger assembly
(16) Pinion
Remove the 1/4 inch screw (9) at the motor field terminal.
For 42MT and 50MT models, remove 1/2 inch nut (1) from the solenoid motor terminal. For 37MT models and 41MT models, remove 1/4 inch screw (2) from the solenoid motor terminal.
Remove motor field connector strap (10).
For insulated models, perform Steps 5.a through 5.c.
Remove the top nut and washer assembly from the solenoids ground terminal (7).
Dispose of the top nut and washer assembly.
Remove the ground lead from the solenoids ground terminal.
Remove three solenoid mounting screws (5).Note: Some solenoids will have four mounting screws on the base of the solenoid.
Remove access plug (11) and gasket (3) from shift lever housing (13).
Remove 1/2 inch plunger nut (12) carefully by following Steps 8.a through 8.d.Note: Proper care must be exercised when completing these steps to avoid personal injury and damage to the solenoid rubber boot. To avoid overheating the solenoid coils, power should not be applied more than 1 minute.
Check required voltage (12V or 24V) stamped on solenoid bracket to energize solenoid.
Apply appropriate power (12V or 24V) to solenoid between the "S" terminal (8) and solenoid ground terminal (7).
Remove the 1/2" plunger nut (12). Dispose of the plunger nut.
Remove power immediately after nut is removed.
Remove complete solenoid (6) and plunger assembly (15).
Illustration 6 g00811560
Measure the pinion clearance between the gear end of the pinion and theinside thenose housing bushing.
Solenoid Replacement Instructions for Semi-Solid Link Solenoid
Use the replacement semi-solid link solenoid to perform the following steps.
Slide the solenoid over lever housing register (4).
Ensure that the flat flange of the solenoid body aligns with the flat flange of the housing.
Verify that plunger rod (14) is inside the shift lever guide. The shift lever guide is located inside shift lever housing (13).
Reinstall three mounting screws (5). Apply the following torque to the mounting screws:Note: Some solenoids will have four mounting screws on the base of the solenoid.
14.12 N m (125 lb in) to 21.47 N m (190 lb in)
Install a new 1/2 inch plunger nut (12). Finger tighten the plunger nut.
Check pinion clearance. Refer to Illustration 6.Note: To avoid personal injury and property damage, take proper care when completing this step. To avoid overheating and possible starting motor damage, maintain power for no longer than 1 minute on Step 4.a before the solenoid is allowed to cool.
For 12 V solenoids, apply 12 DCV to the solenoid's secondary winding. For 24 V solenoids, apply 24 DCV to the solenoid's