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ROD-CYL 2389342 - Caterpillar



2389342 ROD-CYL Caterpillar parts ROD
Rating:
36
Alternative (cross code) number:
CA2389342
238-9342
2389342
Caterpillar 2389342 ROD-CYL
Weight: 25 pounds 11 kg.

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Illustration 1 g01199519
Lockup clutch and synchronizing valve
(1) Lockup clutch solenoid
(2) Passage from the pump for transmission charging
(3) Signal oil passage
(4) Pilot oil passage
(5) Passage for transmission lubrication oil
(6) Relay valve
(7) Spool
(8) Spring
(9) Cover
(10) Load piston body
(11) Selector piston
(12) Load piston
(13) Pilot oil passage
(14) Springs
(15) Drain passage
(16) Modulation reduction valve
(17) Ball check valve
(18) Shuttle valve
(19) Pilot oil passage
(20) Drain passage
(21) Spring
(22) Passage
(23) Drain passage
(24) Load piston plug
(25) Load piston orifice
(26) Pump oil passage
(27) Ball check valve
(28) Drain passage
(29) Pressure reduction valve
(30) Spring
(31) Body of the lockup clutch and synchronizing valve
(32) Passage to lockup clutch
(33) Passage from pump for transmission charging
(34) Drain passage
(35) Passage to Station "D" in the selector and pressure control valve
Illustration 2 g00285612
Lockup clutch and synchronizing valve
(3) Signal oil passage from the lockup clutch solenoid
(5) Passage for transmission lubrication oil
(33) Passage from pump for transmission charging When direct drive is necessary, the lockup clutch solenoid will be energized. During direct drive, the engine is mechanically connected to the transmission by the activation of the lockup clutch. When direct drive is not necessary, the lockup clutch solenoid will be deactivated. Oil pressure will be used to drive the torque converter. In torque converter drive, some of the power from the engine will be transmitted to the transmission through this hydraulic power.Pressure oil from the pump for transmission charging enters the body of the lockup clutch and synchronizing valve at passage (33). Pressure reduction valve (29) allows some of the oil into pilot oil passage (4).A portion of the pump oil goes through an orifice in pressure reduction valve (29). Ball check valve (27) is then opened. Oil goes into a slug chamber at the end of the valve. The oil pressure in the slug chamber presses against the force of spring (30). When the pressure at passage (33) is higher than the force of spring (30), pressure reduction valve (29) will be pushed by the oil in the slug chamber. Pressure reduction valve (29) will compress spring (30). This opens drain passage (28) to pump oil. Pressure reduction valve (29) moves back and forth. This causes drain passage (28) to be blocked and opened. This maintains constant pressure in pilot oil passage (4).The oil that is flowing to pump oil passage (26) goes around the valve spool. This oil remains at full pump pressure.Filling the Lockup Clutch
When lockup clutch solenoid (1) is activated, oil is allowed to flow into signal oil passage (3). Some of this oil goes to the transmission hydraulic control. The remainder of the oil goes into relay valve (6). The pressure of the oil in signal oil passage (3) causes spool (7) to act on spring (8). Pilot oil passage (19) is now open to the oil from pilot oil passage (4). The


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