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TUBE AS 3598777 - Caterpillar



3598777 TUBE AS Caterpillar parts TUBE
Rating:
26
Alternative (cross code) number:
CA3598777
359-8777
3598777
Caterpillar 3598777 TUBE AS

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When the vessel is being towed with the engine stopped, the propeller shaft should be disconnected from the marine gear or the propeller rotation prevented in some suitable manner. The oil pump would not operate under these conditions and serious damage to the bearings, gears and clutches would result.
By-pass System
The oil filter by-pass valve allows lubrication and cooling of the marine gear regardless of any possible stoppage of the normal flow passages because of either cold oil or a clogged filter.The normal oil flow is from the pump to the oil filter to the selector valve. By-pass oil from the selector valve is directed from the selector valve to the oil cooler and back to the manifold. Should the oil filter be restricted, the filter by-pass valve opens, allowing oil to go directly to the selector valve from the pump. This, however, is an emergency type of operation and should not be allowed to continue any longer than necessary before replacing the filter.Hydraulic System
Actuating Oil to Clutches
ACTUATING OIL TO AHEAD CLUTCH (Cross Section)
1-Manifold. 2-Selector valve. 3-Passage. 4-Clutch spider. 5-Passage. 6-Clutch cylinder. 7-Passage through driving ring. 8-Cavity. 9-Ahead clutch plates. 10-Ahead clutch piston. 11-Dump piston.When the selector valve (2) is moved to engage the ahead drive clutch plates (9), high pressure oil flows from the manifold (1) through the passage (3) around the tube in the center of the oil pump drive shaft.A passage (5) in the clutch drive spider (4) intercepts and carries the oil outward where it is directed through the passage (7) in the clutch drive ring and into the clutch cylinder (6). As high pressure oil enters the clutch cylinder it moves the dump valve piston (11) toward the center of the cylinder where it blocks the dump valve exit (13). As the high pressure oil enters the cylinder cavity (8) behind the ahead clutch piston (10), the piston moves the clutch plates together and engages them. See the illustration for oil flow through the dump valve.
HIGH PRESSURE OIL FLOW THROUGH DUMP VALVE (Dump Valve Cutaway)
11-Dump valve piston. 12-High pressure oil entrance. 13-Dump valve exit. 14-Passage to clutch cavity.Disengagement of the clutch occurs when engaging oil pressure is cut off from the dump valve piston by the selector valve. The dump valve piston, unrestrained by engaging oil pressure, is moved outward by centrifugal force, aligning the dump passage (15) through the piston with the passage to the clutch cavity (14). Oil which was in the clutch cavity now moves out of the cavity by centrifugal force and passes through the dump valve piston to the dump valve exit (13) and then to the sump. See the illustration.
DUMP OIL FLOW THROUGH DUMP VALVE (Dump Valve Cutaway)
11-Dump valve piston. 13-Dump valve exit. 15-Dump passage through piston from clutch cavity.When the selector valve (2) is moved to engage the astern clutch plates (20), high pressure oil flows from the manifold through the passage (17) in the center of the tube running through the oil pump drive shaft. The


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