Yamaha F50 Service Manual
Here you can view all the pages of manual Yamaha F50 Service Manual. The Yamaha manuals for Outboard Motor are available online for free. You can easily download all the documents as PDF.
Page 31
62Y3A111-26 1 2 3 4 5 6 7 8 I Tilt-up function 1Power trim and tilt cylinder 2Ram 3End screw 4Check valve 5Trim cylinder 6Reservoir 7Down-main valve 8Gear pump 9Up-main valve0Up-shuttle piston ADown-shuttle piston BTrim cylinder base CFree piston DTilt piston EBalls ÈReturn ÉSend ÊMoving direction : : : 12 3 4 5 678 96 0 6 A B C D E S62Y1400 Technical tips
Page 32
GEN INFO General information 1-2762Y3A11 Circular flow 1Power trim and tilt cylinder 2Ram 3Trim cylinder 4Motor 5Reservoir 6Up-relief valve7Gear pump 8Free piston 9Tilt piston ÈReturn ÉSend : :12 34 5 6 5 7 8 9 S62Y1410
Page 33
62Y3A111-28 1 2 3 4 5 6 7 8 I Tilt-down function When the power trim and tilt switch is pressed to “Down”, the motor turns the gear pump counter- clockwise, thus pumping the power trim and tilt fluid to the down-main valve. As a result, fluid pres- sure opens the down-main valve and the down-shuttle piston, which causes fluid to flow into the upper part of the trim cylinder and forces the tilt piston down. When the tilt piston and the free piston reach the trim cylinder base, it pushes the base down,...
Page 34
GEN INFO General information 1-2962Y3A11 Tilt-down function 1Power trim and tilt cylinder 2Ram 3Trim cylinder 4Down-relief valve 5Down-main valve 6Gear pump 7Reservoir 8Up-relief valve 9Up-shuttle piston 0Up-main valveADown-shuttle piston BBall CTrim cylinder base DFree piston ETilt piston FBalls ÈReturn ÉSend ÊMoving direction : : :12 3 456 78 9 0 A B F C B DE S62Y1420
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62Y3A111-30 1 2 3 4 5 6 7 8 I Stopping condition When the power trim and tilt switch is not pushed (released), the gear pump does not pump the fluid, the up-main valve and the down-main valve are closed, and the power trim and tilt fluid pres- sure in the system remains constant. This allows the ram to maintain its position until the power trim and tilt fluid flows through the system again. When the outboard motor hits something in the water The check valve of the trim cylinder and the tilt piston...
Page 36
GEN INFO General information 1-3162Y3A11 Damper function 1Power trim and tilt cylinder 2Trim cylinder 3Ram 4Tilt piston absorber 5Tilt piston 6Free piston7Check valve 8Tilt piston absorber 9Tilt piston ÈSend ÉMoving direction : : S62Y1430 1 2 3 4 5 67 89
Page 37
62Y3A111-32 1 2 3 4 5 6 7 8 I Propeller selection1 The performance of a boat and outboard motor will be critically affected by the size and type of propeller you choose. Propellers greatly affect boat speed, acceleration, engine life, fuel economy, and even boating and steering capabilities. An incorrect choice could adversely affect performance and could also seriously damage the motor. Use the following information as a guide for selecting a propeller that meets the operating conditions of the boat and...
Page 38
GEN INFO General information 1-3362Y3A11 Predelivery checks1 To make the delivery process smooth and efficient, the predelivery checks should be completed as explained below. Checking the fuel system 1. Check that the fuel hoses are securely connected and that the fuel tank is full with fuel. CAUTION: This is a 4-stroke engine. Never use pre- mixed fuel. Checking the gear oil 1. Check the gear oil level. Checking the engine oil 1. Check the oil level. NOTE: If the engine oil is above the maximum...
Page 39
62Y3A111-34 1 2 3 4 5 6 7 8 I Checking the outboard motor mounting position 1. Check the position of the anti-cavitation plate. 2. Check that the clamp brackets are secured with the clamp bolts. Checking the remote control cables 1. Set the remote control lever to the neu- tral position and fully close the throttle lever/throttle grip. 2. Check that the set pin a is aligned with the alignment mark b . Adjust if neces- sary. 3. Check that the alignment mark c is aligned with the mark d . Adjust if...
Page 40
GEN INFO General information 1-3562Y3A11 2. Check that the throttle control lever con- tacts the respective stoppers when the throttle control lever is closed or fully open. Checking the tilt system 1. Check that the outboard motor can be smoothly tilted up and down by operating the power trim and tilt unit. 2. Check that there is no abnormal noise produced when the outboard motor is tilted up and down. 3. Check that there is no interference with wires and hoses when the tilted-up motor is steered. 4....