CYLINDER GP-HYDRAULIC 2055272 - Caterpillar

Operation
MARINE TRANSMISSION CUTAWAY 1. Oil pump.2. Input shaft.3. Ahead clutch (discs and plates.)4. Drive pinion.5. Flexible connector (to engine flywheel).6. Ahead clutch gear.7. Output shaft.8. Driven gear.9. Astern clutch gear.The marine transmission has a flexible connector (5) on input shaft (2). Drive pinion (4) and driven gear (8) make a reduction in speed (rpm) so output shaft (7), from the transmission, turns slower than the speed (rpm) of the engine.The flexible connector (5) has a spider with gear teeth on the diameter of the spider. The spider is on the input shaft of the transmission. Another part of the coupling is a ring with gear teeth in the bore of the ring. The ring is on the engine flywheel. The flexible parts are the rubber blocks between the teeth on the spider and the teeth in the ring. The engine turns the flywheel and ring, the teeth in the ring push on the rubber blocks. The rubber blocks push the teeth on the spider which turns the spider and the input shaft of the transmission.
MARINE TRANSMISSION
1. Oil pump. 10. Rubber block. 11. SpiderThe oil pump (1) is connected to the end of input shaft (2) and turns at the same speed (rpm) as the engine. The oil for the pump is in the sump of the transmission. The oil from the pump is both for lubrication and is the supply of pressure oil that can activate either the ahead or the astern clutch. The reference to the clutches, is the astern clutch (reverse motion) and the ahead clutch (forward motion of the vessel when the propeller has a right hand pitch).The ahead clutch gear (6) is the drive gear for astern clutch gear (9) and both gears turn when the engine is running. With the control valve lever in the NEUTRAL position, the ahead clutch and the astern clutch are not engaged and drive pinion (4) on input shaft (2) and the drive pinion on the astern clutch shaft do not turn. The positions for the control valve lever will be NEUTRAL, AHEAD (forward) and ASTERN (reverse). In some vessels the installation of the engine and marine transmission (or the direction of the pitch of the propeller) changes the lever position locations for ahead and astern motion of the vessel.
SCHEMATIC OF MARINE TRANSMISSION (GEARS) (Control Lever in NEUTRAL Position)
2. Input shaft. 4. Drive pinion. 6. Ahead clutch gear. 7. Output shaft. 8. Driven gear. 9. Astern clutch gear.Move the control lever to the AHEAD position and the pump oil from the control valve engages the clutch in ahead clutch gear (6) on input shaft (2). When the clutch in gear (6) is engaged, drive pinion (4) turns with gear (6). Drive pinion (4) turns driven gear (8) on output shaft (7) but in a different direction. The output shaft (7) turns clockwise with the ahead clutch engaged (when seen from the stern towards the bow of the vessel and when the engine flywheel turns counterclockwise).
SCHEMATIC OF MARINE TRANSMISSION