Yamaha F50 Service Manual
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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
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
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, allow- ing the balls to move inward. Once the balls move in, the trim cylinder is then able to move down and power trim and tilt fluid continues to flow into the cylinder and pushes the trim cylinder down, along with the tilt piston and ram. The end of the tilt-down range is when the tilt piston and the free piston bottom out in the trim cylin- der base. When the power trim and tilt fluid pushes the trim cylinder down further trim-down is started. The end of the trim-down range is when the trim cylinder arrives at the bottom of the power trim and tilt cylinder. Before the trim cylinder arrives at the bottom of the power trim and tilt cylinder, an amount of fluid equal to the volume of the ram is returned to the reservoir. Technical tips
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
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 absorber of the tilt piston help to prevent inter- nal damage to the power trim and tilt unit and help to protect the bracket and lower unit from dam- age in case the outboard motor hits something during operation. When the outboard motor hits something, highly pressurized fluid in the upper part of the power trim and tilt cylinder pushes down the check valve of the trim cylinder. At the same time, fluid pressure in the upper part of the trim cylinder increases and the tilt piston absorber is pushed down. As a result, the tilt piston and the ram are pushed up without the free piston. The tilt piston is stopped before reaching the top of the trim cylinder by the damper function of the tilt piston absorber to protect the power trim and tilt unit from damage. Technical tips
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
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 the outboard motor. Propeller size The size of the propeller is indicated on the propeller blade or outside of the propeller boss. aPropeller diameter (in inches) bPropeller pitch (in inches) cPropeller type (propeller mark) Selection When the engine speed is at the full throttle operating range (5,000–6,000 r/min) an ideal propeller for the boat is one that provides maximum performance in relation to boat speed and fuel consumption. S62Y1440 10 3/4 × 17 - G 10 3/4 × 17 - G 13 × 19 - K S62Y1450 13 × 19 - K 10 3/4 × 17 - G F50/F50A Propeller size (in) Material 10 × 15 - G Aluminum 10 1/4 × 14 - G Aluminum 10 3/8 × 13 - G Aluminum 10 5/8 × 12 - G Aluminum 10 3/4 × 16 - G Aluminum 10 3/4 × 17 - G Aluminum 11 1/8 × 13 - G Aluminum 11 1/4 × 14 - G Aluminum 11 3/8 × 12 - G Aluminum 11 5/8 × 11 - G Aluminum 12 1/4 × 9 - G Aluminum 10 1/4 × 14 - G Stainless 10 1/4 × 15 - G Stainless 10 1/4 × 16 - G Stainless 10 5/8 × 13 - G Stainless 11 1/4 × 14 - G Stainless 11 1/2 × 13 - G Stainless 11 3/4 × 12 - G Stainless 12 × 11 - G Stainless T50/FT50B, FT50C Propeller size (in) Material 12 5/8 × 21 - K Aluminum 13 × 19 - K Aluminum 13 × 23 - K Aluminum 13 × 25 - K Aluminum 13 1/4 × 17 - K Aluminum 13 1/2 × 15 - K Aluminum 13 5/8 × 13 - K Aluminum 14 × 11 - K Aluminum Technical tips / Propeller selection
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 level mark a , drain sufficient oil until the level is between a and b . If the engine oil is below the minimum level mark b , add sufficient oil until the level is between a and b . Checking the battery 1. Check the capacity, electrolyte level, and specified gravity of the battery. 2. Check that the positive and negative bat- tery leads are securely connected. S62Y1470 Recommended engine oil: API: SE, SF, SG, SH SAE: 10W-30, 10W-40, or 20W-40 Oil capacity: Without oil filter replacement: 2.0 L (2.1 US qt, 1.8 Imp qt) Battery capacity: 70–100 Ah (252–360 kC) Minimum cold cranking performance: 380 A Electrolyte specific gravity: 1.28 at 20 °C (68 °F)
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 neces- sary. CAUTION: The shift/throttle cable joint must be screwed in a minimum of 8.0 mm (0.31 in) e . Checking the steering wheel/tiller handle 1. Check the steering friction for proper adjustment. 2. Check the steering for smooth operation. 3. Check that there is no interference with wires or hoses when the outboard motor is steered. Checking the gearshift and throttle operation 1. Check that the gearshift operates smoothly when shifting from neutral into forward and reverse. S62Y1530 Predelivery checks
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. Check that the trim meter points down when the outboard motor is tilted all the way down. Checking the engine start switch and engine stop switch/engine shut-off switch 1. Check that the engine starts when the engine start switch is turned to START. 2. Check that the engine turns off when the engine start switch is turned to OFF. 3. Check that the engine turns off when the engine stop switch is pushed/engine shut-off cord is pulled. Checking the pilot water outlet 1. Check that cooling water is discharged from the pilot water outlet. Test run 1. Start the engine, and then check for smooth gearshift operation. 2. Check the engine idle speed after the engine has been warmed up. 3. Operate at trolling speed. 4. Run the outboard for one hour at 2,000 r/min or at half throttle, then for another hour at 3,000 r/min or at 3/4 throttle. 5. Check that the motor will not tilt up when shifting into reverse and that water will not flow in over the transom. NOTE: The test run is part of the break-in operation.