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3. Battery cable terminals should be clean, tight, and correctly installed.

Positive to positive and negative to negative.

4. Ensure the battery is equipped with a nonconductive shield to prevent

accidental shorting of battery terminals.

Battery Cables and Clean Power Harness

The battery cable connections should be checked often for corrosion or loose

retaining hardware. Maintaining this electrical connection helps ensure the

engine operation and accessories functionality remains trouble‑free. The

engine starting battery cables and the clean power harness wires must be

secured to the engine starting battery with nuts. Wing nuts are not acceptable.

The clean power harness must be secured to one of the battery cables with a

cable tie or other type of secure fastener.

a -

14‑pin data harness

b -

Clean power harness connector at engine

c -

Clean power harness

d -

Battery

e -

Negative engine battery cable

f -

Positive engine battery cable

If the clean power harness fuse is open, try to locate and correct the cause of

the overload. If the cause is not found, the fuse may open again. Remove the

clean power fuse and look at the silver band inside the fuse. If the band is

broken (open), replace the fuse with the same rating (5 amp) and type fuse.

26984

MAINTENANCE

eng

Содержание 300R HD CMS Mechanical

Страница 1: ...Operation and Maintenance Manual 2018 Mercury Marine 300R HD CMS Mechanical 8M0140585 518 eng...

Страница 2: ...eng...

Страница 3: ...nual Thoroughly IMPORTANT If you do not understand any portion of this manual contact your dealer Your dealer can also provide a demonstration of actual starting and operating procedures Notice Throug...

Страница 4: ...oved for printing Mercury Marine whose policies are based on continuous improvement reserves the right to discontinue models at any time or to change specifications or designs without notice and witho...

Страница 5: ...ort Jet Verado VesselView Zero Effort Zeus 1 On the Water and We re Driven to Win are registered trademarks of Brunswick Corporation Pro XS is a trademark of Brunswick Corporation Mercury Product Prot...

Страница 6: ...eng iv...

Страница 7: ...10 Exhaust Emissions 11 Selecting Accessories for Your Outboard 13 Safe Boating Recommendations 13 Recording Serial Number 16 Specifications 300R HD 17 Component Identification 19 Gearcase Identifica...

Страница 8: ...ons 48 Inspection and Maintenance Schedule 49 300R HD Models Maintenance Schedule Decal 51 Flushing the Cooling System 52 Top Cowl Removal and Installation 52 Battery Inspection 54 Battery Cables and...

Страница 9: ...sitioning Outboard for Storage 82 Battery Storage 82 Troubleshooting Starter Motor Will Not Crank the Engine 83 Engine Will Not Start 83 Engine Runs Erratically 83 Performance Loss 84 Battery Will Not...

Страница 10: ...eng viii...

Страница 11: ...g with using good common sense can help prevent personal injury and product damage This manual as well as safety labels posted on the outboard use the following safety alerts to draw your attention to...

Страница 12: ...s in the propulsion system An improper propeller choice can significantly affect the performance of your boat and could result in damage to the outboard engine When choosing a propeller a full selecti...

Страница 13: ...gn of your outboard However when more than one diameter is available for the same pitch use a larger diameter for heavy boat applications and a smaller diameter for lighter applications Pitch The pitc...

Страница 14: ...of sizes and styles that allow you to dial in the ultimate performance for your boat 3 BLADE VS 4 BLADE Available in many sizes of both aluminum and stainless 3 and 4 blade propellers have unique per...

Страница 15: ...usually 122 152 cm 4 5 feet in length when stretched out with an element on one end made to be inserted into the switch and a clip on the other end for attaching to the operator s PFD or wrist The lan...

Страница 16: ...ut down However the boat will not complete a full circle While the boat is coasting it can cause injury to anyone in the boat s path as seriously as the boat would when under power We strongly recomme...

Страница 17: ...ng in the water to take quick action to avoid a boat heading in his her direction even at slow speed 21604 Always slow down and exercise extreme caution any time you are boating in an area where there...

Страница 18: ...the deck in front of the fence while the boat is in motion Keep all passengers behind the front fence or enclosure Persons on the front deck could easily be thrown overboard or persons dangling their...

Страница 19: ...se the boat to veer violently in a new direction Such a sharp change in direction can cause occupants to be thrown out of their seats or out of the boat WARNING Wave or wake jumping can cause serious...

Страница 20: ...trol the boat speed Under these conditions boat speed should be kept to the minimum planing speed typically 24 to 40 km h 15 to 25 mph 26785 WARNING Avoid serious injury or death from all or part of a...

Страница 21: ...ath If the vessel experiences any form of impact have an authorized Mercury Marine dealer inspect and repair the vessel or power package Exhaust Emissions BE ALERT TO CARBON MONOXIDE POISONING Carbon...

Страница 22: ...xhaust concentration but also subjects them to the possibility of injury from the boat propeller GOOD VENTILATION Ventilate the passenger area open side curtains or forward hatches to remove fumes Exa...

Страница 23: ...accessories are available from Mercury Marine dealers IMPORTANT Check with your dealer before installing accessories The misuse of approved accessories or the use of nonapproved accessories can damage...

Страница 24: ...Radio Paddle or oar Spare propeller thrust hubs and an appropriate wrench First aid kit and instructions Waterproof storage containers Spare operating equipment batteries bulbs and fuses Compass and...

Страница 25: ...hat all passengers have a proper seat and are in it before any boat movement Never operate a boat while under the influence of alcohol or drugs It is the law Alcohol or drugs can impair your judgment...

Страница 26: ...uiring medical treatment beyond first aid 3 there is damage to boats or other property where the damage value exceeds 500 00 or 4 there is complete loss of the boat Seek further assistance from local...

Страница 27: ...Sport Master ratio 1 75 1 137 mm 5 4 in ratio 1 75 1 Gearcase capacity Sport Master RH LH 620 mL 21 0 fl oz 137 mm 5 4 in RH 720 mL 24 4 fl oz 137 mm 5 4 in LH 680 mL 23 0 fl oz Recommended gasoline...

Страница 28: ...at a higher rate Activating troll control optional accessory will override the idle charge compensation feature Battery manufacturers may rate and test their batteries to different standards MCA CCA A...

Страница 29: ...ine flush d Auxiliary tilt switch e Cooling water intake holes f External steering bracket dealer installed option or factory installation available g Water pump indicator hole h Engine oil drain i Ex...

Страница 30: ...in Water intake eight per side four torpedo low water L L 64308 Left hand rotation gearcase LL stamped on the end of propeller shaft Sport Master Water intake three torpedo low water 64532 L L Left ha...

Страница 31: ...ice Refer to your local dealer for recommendations Additional clearance may be required for railroad crossings driveways and trailer bouncing 66304 IMPORTANT Do not rely on the power trim tilt system...

Страница 32: ...ntly in use in the USA is alcohol ethanol methanol or butanol GASOLINE CONTAINING ALCOHOL Bu16 Butanol Fuel Blends Fuel blends of up to 16 1 butanol Bu16 that meet the published Mercury Marine fuel ra...

Страница 33: ...components Fuel Additives To minimize carbon deposit buildup in the engine it is recommended to add Mercury or Quicksilver Quickstor fuel stabilizer additive to the engine s fuel at each tank fill thr...

Страница 34: ...If the recommended Mercury or Quicksilver NMMA FC W certified oils are not available a major outboard manufacturer s brand of NMMA FC W certified 4 Stroke outboard oil of similar viscosity may be use...

Страница 35: ...an hour 1 Before starting a cold engine tilt the outboard out up past vertical to allow trapped oil to drain back to the oil sump Allow the outboard to remain tilted for approximately one minute 2 Ti...

Страница 36: ...een the beads are part of the dipstick assembly When checking the oil level if oil is on any of the five oil range beads or four crosshatch the oil level is within the safe operating range When the oi...

Страница 37: ...e of the beads shows the oil level remove the oil filler cap and add 1 8 Liter 2 US qt of the specified outboard motor oil 7 Allow a few minutes for the oil to drain into the sump and insert the oil d...

Страница 38: ...e speed control is active from idle RPM up to max rated RPM however can only maintain engine speed when the throttle is less than wide open Remote Control Features Your boat may be equipped with one o...

Страница 39: ...itions are as follows Water in the engine mounted fuel filter Refer to Maintenance Low Pressure Fuel Filter Cooling system water pressure or engine temperature problem Stop the engine and check the wa...

Страница 40: ...Engine Guardian diagnostics The SmartCraft instrument package will display critical engine alarm data and potential problems EXHAUST GAS OVER TEMPERATURE When the Engine Guardian system detects the ex...

Страница 41: ...forward gear Power Trim and Tilt The outboard has a trim tilt control called power trim This enables the operator to easily adjust the position of the outboard by pressing the trim switch Moving the...

Страница 42: ...hazards The most significant control hazard is a pull or torque that can be felt on the steering wheel or tiller handle This steering torque results from the outboard being trimmed so the propeller s...

Страница 43: ...out or up can Lift the bow higher out of the water Generally increase top speed Increase clearance over submerged objects or a shallow bottom Increase steering torque or pull to the left at a normal i...

Страница 44: ...cket 2 Remove the pins from and install them into the desired adjustment holes 3 Install and tighten the nuts OPERATING IN SHALLOW WATER When operating your boat in shallow water you can tilt the outb...

Страница 45: ...NOTE Exceeding 4250 RPMs the engine PCM will begin Engine Guardian protection FEATURES AND CONTROLS eng 35...

Страница 46: ...um load capacity Look at the boat capacity plate Fuel supply OK Arrange passengers and load in the boat so the weight is distributed evenly and everyone is seated in a proper seat Tell someone where y...

Страница 47: ...ays tilt the outboard so the gearcase is completely out of water except in freezing temperatures when not in use Wash the outboard exterior and flush out the exhaust outlet of the propeller and gearca...

Страница 48: ...ain lower In some cases a gear ratio reduction may be more beneficial To optimize engine performance prop the engine to allow it to operate at or near the top end of the recommended maximum RPM range...

Страница 49: ...ne PRIMING THE FSM WITH A PURGE TOOL The use of a purge tool for priming the FSM is the preferred method but is not always practical The objective is to purge the air entrained in the fuel system thro...

Страница 50: ...already primed If a primer bulb is installed it can be used during the priming event to shorten the amount of time required to start the engine NOTE In most cases the priming procedure can be accompli...

Страница 51: ...ICE Without sufficient cooling water the engine the water pump and other components will overheat and suffer damage Provide a sufficient supply of water to the water inlets during operation 1 Push dow...

Страница 52: ...the engine oil level Refer to Fuel and Oil Checking and Adding Engine Oil a Service access door b Oil fill cap c Dipstick 3 Ensure that the cooling water intake is submerged 66310 b c a 63305 OPERATIO...

Страница 53: ...For initial start of a new engine or for an engine that ran out of fuel or was drained of fuel the fuel system should be filled as follows Turn the ignition key switch to the ON position for approxima...

Страница 54: ...engine idle speed could cause damage to the gearcase Do not shift the outboard into reverse when the forward motion of the boat is greater than a no wake speed Shifting into reverse at higher boat spe...

Страница 55: ...Stopping the Engine Reduce the engine speed and shift the outboard to neutral position Turn the ignition key to OFF position 26843 OFF ON S T A R T OPERATION eng 45...

Страница 56: ...lure Some caustic cleaning chemicals may cause or accelerate corrosion Exercise caution when using cleaning chemicals around the engine and follow the recommendations on the packaging of the cleaning...

Страница 57: ...mild nonabrasive soap Use a soft clean cloth when washing 3 Dry thoroughly with a soft clean cloth 4 Wax the surface using a nonabrasive automotive polish polish designed for clear coat finishes Remo...

Страница 58: ...FICATION LABEL An emission certification label showing emission levels and engine specifications directly related to emissions is placed on the engine at the time of manufacture a Idle speed b Engine...

Страница 59: ...n Nm lb in lb ft Outboard mounting locknuts and bolts standard boat transom 75 55 3 Outboard mounting locknuts and bolts metal lift plates and setback brackets 122 90 Visually inspect the fuel system...

Страница 60: ...ten the fasteners to the specified torque dealer service Description Nm lb in lb ft Outboard mounting locknuts and bolts standard boat transom 75 55 3 Outboard mounting locknuts and bolts metal lift p...

Страница 61: ...Lubricate more frequently when used in saltwater Refer to Lubrication Points Replace water pump impeller dealer service 1 Lubricate the splines on the upper driveshaft dealer service Check wiring and...

Страница 62: ...emove the flush connector from the bottom cowl 3 Remove the cover from the flush connector and thread a water hose into the flush connector 64241 4 Turn on the water tap 1 2 maximum and let the water...

Страница 63: ...ort side of the service access door to unlock and open the door 64230 Push here to unlock 3 Press on the red lock button and lift the handle a Service access door b Red lock button c Handle b c a 6330...

Страница 64: ...ll have a gap that is larger than the other side NOTE It may be necessary to slightly lift the larger gap side of the cowl to correctly position the alignment guides 3 Gently push down on the cowl 4 P...

Страница 65: ...he clean power harness wires must be secured to the engine starting battery with nuts Wing nuts are not acceptable The clean power harness must be secured to one of the battery cables with a cable tie...

Страница 66: ...gative ground When connecting the engine battery hex nuts must be used to secure the battery leads to the battery posts Tighten the hex nuts to the specified torque Description Nm lb in lb ft Battery...

Страница 67: ...r signs of deterioration or damage If any of these conditions are found the fuel line must be replaced LOW PRESSURE FUEL FILTER The low pressure fuel filter can be serviced as a general maintenance it...

Страница 68: ...th a water in fuel sensor installed the sensor harness would be connected to the boat mounted filter a Fuel hose release tabs b Water in fuel sensor harness 6 Rotate the filter clockwise approximately...

Страница 69: ...t the fuel hoses to the fuel filter securely with the locking hose connections 5 Turn the key to the RUN position and inspect for fuel leaks Repair any fuel leaks if necessary Corrosion Control Anode...

Страница 70: ...e lanyard stop switch to prevent the engine from starting Place a block of wood between the propeller blade and the anti ventilation plate 1 Shift the outboard into neutral position 2 Place a block of...

Страница 71: ...nstall the propeller hub propeller washer Belleville washer washer and propeller nut onto the shaft a Propeller nut b Washer c Belleville washer d Washer e Propeller f Propeller hub 6 Place a block of...

Страница 72: ...rk plug if the electrode is worn the insulator is rough cracked broken or blistered or if the precious metal is not visible on the spark plug electrode IMPORTANT The color of the plug may not accurate...

Страница 73: ...gap use a tool that only pulls back on the ground electrode without touching the center electrode the porcelain or the wear portion of the ground electrode e When it is necessary to close the gap gen...

Страница 74: ...is type of fuse must be used for marine applications Marine applications are exposed to environments that may have the potential to accumulate explosive vapors ATO fuses have exposed elements and shou...

Страница 75: ...er on the port side of the engine and remove the cover from the fuse holder 63317 2 Remove the suspected open fuse and look at the silver band inside the fuse If the band is broken open replace the fu...

Страница 76: ...tor drive belt is located under the flywheel shroud intake air induction plenum The alternator drive belt inspection must be completed by an authorized Mercury dealer at the recommended interval Refer...

Страница 77: ...eller shaft 92 802859A 1 Lubricate the tilt lock through the grease fitting Lubricate the swivel bracket through the grease fitting a Tilt lock grease fitting b Swivel bracket grease fitting Lubricate...

Страница 78: ...r package at high speeds when the engine is trimmed out When the engine is trimmed up or down the swivel bracket thrust guide will rub against the thrust guide wear pads which are mounted on the trans...

Страница 79: ...ck the fluid level in the trim pump reservoir The level should be between the minimum MIN and the maximum MAX level on the reservoir 3 If necessary remove the yellow fill cap and add Power Trim and St...

Страница 80: ...l of fluid to ensure the steering helm will not introduce air into the steering system A hydraulic steering system which has entrained air will have spongy or unresponsive steering control which could...

Страница 81: ...e minute to allow any trapped oil to drain back to the oil sump OIL CHANGE ON LAND PROCEDURE 1 Tilt the outboard out up past vertical for approximately one minute to allow any trapped oil to drain bac...

Страница 82: ...ighten the oil drain valve to the specified torque Clean up any oil in the valve area Description Nm lb in lb ft Oil drain valve 15 132 7 IMPORTANT Overtightening the oil drain valve can damage the oi...

Страница 83: ...cess door to unlock and open the door 64230 Push here to unlock 4 Remove the dipstick 5 Install the oil drain hose onto the crankcase oil pump Verify the hose is securely attached a Crankcase oil pump...

Страница 84: ...ify the pump is securely attached to the tube by pulling it up lightly a Oil drain hose b Lock button 7 Place the drain tube of the crankcase oil pump into an appropriate container The container shoul...

Страница 85: ...ilter b Drain hose 3 Allow the oil in the trough to drain 4 Clean the remaining oil from the oil trough and filter mounting base area 5 Remove the hose and install the plug 6 Apply a film of clean oil...

Страница 86: ...mple DIPSTICK BEAD OIL LEVEL OVERVIEW New oil level may be difficult to identify which is why the crosshatch between the beads are part of the dipstick assembly When checking the oil level if oil is o...

Страница 87: ...on or once a year whichever occurs first 1 Remove the top cowl Refer to Top Cowl Removal and Installation 2 Remove the hose from the exhaust water spray inlet assembly Press on the hose lock and pull...

Страница 88: ...e the gearcase checked by your dealer Water in the lubricant may result in premature bearing failure or in freezing temperatures will turn to ice and damage the gearcase Examine the drained gearcase l...

Страница 89: ...l plug Install the lubricant level plug 4 Remove the tube and install the fill drain plug 5 Tighten the plugs to the specified torque Description Nm lb in lb ft Plugs 11 3 100 Checking Lubricant Level...

Страница 90: ...5 Remove the lubricant tube and install the fill drain plug and sealing washer 6 Tighten the plugs to the specified torque Description Nm lb in lb ft Plugs 11 3 100 MAINTENANCE 80 eng...

Страница 91: ...engine s fuel system other than the fuel tank will remain stable during normal storage periods without the addition of fuel treatment stabilizers Fill the fuel tank and engine fuel system with treate...

Страница 92: ...s and the high tension spark plug leads Gearcase Drain and refill the gearcase lubricant Refer to Gearcase Lubrication Positioning Outboard for Storage Store outboard in an upright vertical position t...

Страница 93: ...pty Fuel tank vent not open or restricted Fuel line is disconnected or kinked Fuel filter is obstructed Refer to Maintenance section Fuel pump failure Fuel tank filter obstructed Ignition system compo...

Страница 94: ...tment or setup Boat overloaded or load improperly distributed Excessive water in bilge Boat bottom is dirty or damaged Battery Will Not Hold Charge POSSIBLE CAUSES Battery connections are loose or cor...

Страница 95: ...s in the recovery of stolen power packages ATTENTION REQUIRED AFTER SUBMERSION 1 Before recovery contact an authorized Mercury dealer 2 After recovery immediate service by an authorized Mercury dealer...

Страница 96: ...rial numbers of your power package The name and address of your dealership The nature of the problem CONTACT INFORMATION FOR MERCURY MARINE CUSTOMER SERVICE For assistance call fax or write to the geo...

Страница 97: ...Before ordering literature have the following information about your power package available Model Serial Number Horsepower Year UNITED STATES AND CANADA For additional literature for your Mercury Ma...

Страница 98: ...Department W6250 Pioneer Road P O Box 1939 Fond du Lac WI 54936 1939 Ship To Copy this form and print or type This is your shipping label Name Address City State Province ZIP or postal code Country Q...

Страница 99: ...Maintenance Log Record all maintenance performed on your outboard here Be sure to save all work orders and receipts Date Maintenance Performed Engine Hours MAINTENANCE LOG eng 89...

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