MOUNT AS 4382904 - Caterpillar

MARINE TRANSMISSION
1. Pump. 2. Strainer. 3. Control valve.The oil filter housing has an oil bypass valve. The difference between the pressure of the oil to the filter element and the oil from the element is the control for the bypass valve. When the difference between the pressure of the inlet and outlet oil is too much, caused by a filter element that is full of dirt, the bypass valve opens. When the bypass valve is open, the pump oil, in the passage in the housing, goes directly to the control valve for the marine transmission.Two plugs, one in the side of the oil strainer and the other in the right side of the transmission housing and a shut-off valve in the line from the oil strainer to the transmission oil pump are used only if there is an emergency. The oil lines to and from a pump, with a separate drive for the pump, can be connected to where each plug is removed. The valve in the line to the transmission pump is shut-off when the emergency oil pump is in operation.Control Valve
Neutral Position
The control valve is on the right side of the marine transmission. All of the oil from the pump, when the engine is running, goes into the control valve. The lever on the control valve has three positions which are: AHEAD, (forward), ASTERN (reverse) and NEUTRAL.
CONTROL VALVE IN NEUTRAL POSITION (Engine Running)
1. Control valve body. 2. Control valve spool. 3. Springs (bypass valve). 4. Outlet passage (to oil cooler). 5. Inlet passage (from filter and pump). 6. Bypass valve. 7. Braking (damping) valve.The NEUTRAL position of the control lever keeps valve spool (2) in a position where the pump oil through inlet passage (5), and a passage in valve body (1), goes to a chamber with no outlet to the clutches. The pump oil also goes through a passage in bypass valve (6) and is stopped by valve (7). With no outlet for the pump oil in the control valve, the pressure of the pump oil increases. Pump oil pressure of 50 to 60 psi (345 to 415 kPa) opens valve (7) and goes into the valve chamber in bypass valve (6). The pump oil in valve (7) chamber has more force than springs (3), in bypass valve (6), and the oil moves the bypass valve. Now the pump oil goes through outlet passage (4), through the oil cooler and through the lubricant passages in the transmission.AHEAED Position
The AHEAD (forward) position of the control lever keeps valve spool (6), in a position where the pump oil through inlet passage (14), and a passage in valve body (1), goes through passage (13) to the ahead clutch. The pressure of the pump oil must increase to engage the clutch. The pump oil in passage (13) also moves ball (11), goes into check valve (5) and moves the check valve against stop (3). The pump oil in the check valve goes through four orifices (4) and then moves