CONTACTOR GP-OVERSPEED 7L7367 - Caterpillar

Pulling on the wiring harness may break the wires. Do not pull on the wiring harness.
Illustration 2 g03779598
(5) Transformer
(6) Extender and lip seal
(7) Spark plug
(8) Wiring harness
Disconnect wiring harness (8) from transformer (5). Be careful while depressing the retainer clip away from the connector. Remove transformer (5).
Inspect extender and lip seal (6). If the seal is worn or damaged, replace with a new seal. If the extender shows signs of damage, replace with a new extender. The extender is threaded into the transformer.
Illustration 3 g03779613
(9) O-ring seal
Inspect O-ring seal (9). If the seal is hard, cracked, or melted, install a new seal.
Pressurized air can cause personal injury. When pressurized air is used for cleaning, wear a protective face shield, protective clothing, and protective shoes.
Note: Excessive buildup of oil in the spark plug well is an indication of a damaged lip seal on the transformer. If this condition is found, clean the surface of the seal groove. Replace seal (6).
Debris may have collected in the spark plug well. Thoroughly remove any debris. Use compressed air. The maximum air pressure for cleaning purposes must be below 207 kPa (30 psi). Ensure that the area around the spark plug is clean and free of dirt and debris.
Use a 7/8 inch deep well socket, an extension, and a breaker bar to loosen spark plug (7). After the spark plug has been loosened, use the socket and extension to remove the spark plug by hand to detect problems with the threads. After the spark plug has been removed, discard the used spark plug gasket.If the spark plug resists removal by hand, apply penetrating oil to the threads. To help the oil penetrate the threads, turn the spark plug back and forth until the spark plug is loose.If the spark plug could not be removed by hand, clean the threads with the 9U-7511 Spark Plug Seat Cleaner. This tool scrapes debris from the seat and from the threads in the cylinder head. Be sure to clean any debris from the cylinder.
Do not use a thread tap. A thread tap will remove metal unnecessarily. The threads could be stripped and the cylinder head could be damaged.
Inspecting the Spark Plug
Illustration 4 g03779622
(1) Terminal post
(2) Shell
(3) Gasket
(4) Hole in the spark plug precombustion chamberInspect the spark plug closely for damage. The condition of the spark plug can indicate the operating condition of the engine.Terminal post (1) must not move. If the terminal post can be moved by hand, discard the spark plug.Faint marks may extend from shell (2) onto the insulator. The marks may be a result of a corona that forms at the top of the shell. The conductor will develop a corona when a high voltage potential ionizes the air. This corona is a normal condition. This corona is not an indication of leakage between the shell and the insulator.Inspect shell (2) for damage. Cracks can be caused by overtightening the spark plug. Overtightening can also yield the metal which loosens the shell. Discard any spark plug