SOLENOID AND OPERATING MECHANISMS - TM-55-1930-209-14P-9-4

REPAIR AND TESTING INSTRUCTIONS COMMUTATOR - TM-55-1930-209-14P-9-4_761

TM-55-1930-209-14P-9-4 Water Purification Barges (NSN 1930-01-234-2165) Electric Power System Manual
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ELECTRICAL EQUIPMENT—Q.16 (b) DRIVE END BEARING 1. Press out the old bearing bush from the inside of the end-shield. 2. Press in new bush taking care to keep the lubricating wick away from the bore by using a split dolly. Finally set up the end-shield on a lathe and turn the bore using a spigot diameter as a register, to 1.126—1.137 in (28.6—28,62 mm). PINION If the pinion teeth are badly worn, obtain a replacement and offer this up to the shaft to ensure freedom of movement. Should it be necessary they can be lightly lapped together. SOLENOID AND OPERATING MECHANISMS Examine all moving parts for wear. Inspect the electrical leads for chafing and impaired insulation. Examine the springs for possible fracture and replace as necessary. After any removal, the spring pressures should be checked before re-assembly In accordance with the following:-e Ball-lock spring (18) (Fig Q.9)—11 lbf/in (1,97 kgf/cm) Pinion return spring (4) — 8.6 lbf/in (1.54 kgf/cm) Main contact (plunger) spring (14) 91/2 — 12 lbf (4,31—5,44 kgf) when compressed to 3/16 in (4,76 mm). Contact return spring (42) 6—7 lbf (2,72— 3,18 kgf) when compressed to 1/4 in (6,35 mm). CONTACTS Examine the "fixed " and "moving " contacts, and clean them with spirit or very fine carborundum paper. If the contacts are badly burnt and pitted, they should be replaced. As replacements are not supplied ready machined, it will be necessary to face them when in position. It is essential, when facing the "fixed" contacts, that they are kept to the angle shown in Fig. Q.12. Fig. Q.12. This can most easily he done by placing a 1/16 in (1,6 mm) shim behind the end-plate and the faceplate on the lathe. This will provide the required 2 angle. Make sure that the shim is placed on the correct side. Alternatively, if a number of refacing operations are likely to be dealt with, a suitable face-plate can be made up for attaching to the lathe. This should have one side machined to the 2 angle, as shown in Fig. Q.13. The end-plate of the solenoid can then be secured to it, and the contacts skimmed. In facing the "moving" contacts, it is essential to keep to a dimension within the limits 0.250 in to 0.247 in (6,35 to 6,27 mm), between the rear side of the back-plate and the contact face.

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