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300R HD CMS Mechanical
Mercury 300R HD CMS Mechanical User Manual
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Operation
and
Maintenance
Manual
© 2018 Mercury Marine
300R HD CMS Mechanical
8M0140585
518
eng
2
Table of Contents
Table of Contents
7
Boater's Responsibilities
11
Before Operating Your Outboard
11
Boat Horsepower Capacity
11
General Information
11
High-Speed and High-Performance Boat Operation
12
Propeller Selection
12
Outboard Remote Control Models
14
Lanyard Stop Switch
15
Protecting People in the Water
17
Passenger Safety Message - Pontoon Boats and Deck Boats
18
Wave and Wake Jumping
19
Impact with Underwater Hazards
20
Exhaust Emissions
21
Selecting Accessories for Your Outboard
23
Safe Boating Recommendations
23
Recording Serial Number
26
Specifications-300R HD
27
Component Identification
29
Gearcase Identification
30
Trailering Boat/Outboard
31
Transporting
31
Fuel Requirements
32
Fuel and Oil
32
Fuel Additives
33
Low Permeation Fuel Hose Requirement
33
Fuel Demand Valve (FDV) Requirement
33
Engine Oil Recommendations-Race (R) Models
34
Checking and Adding Engine Oil
34
Remote Control Features
38
Warning System
38
Adaptive Speed Control
38
Features and Controls
38
Power Trim and Tilt
41
Important Daily Inspection before each Use
46
Prestarting Check List
46
Operating in Freezing Temperatures
46
Operation
46
Operating in Saltwater or Polluted Water
47
Operating at High Elevations
47
Effects of Elevation and Weather on Performance
47
Setting Trim Angle While Running Engine at Idle Speed
48
Engine Break-In Procedure
49
Fuel Supply Module Priming Procedure
49
Starting the Engine
51
Gear Shifting
54
Stopping the Engine
55
Cleaning Care Recommendations
56
Maintenance
56
EPA Emissions Regulations
58
Inspection and Maintenance Schedule
59
300R HD Models Maintenance Schedule Decal
61
Flushing the Cooling System
62
Top Cowl Removal and Installation
62
Battery Inspection
64
Battery Cables and Clean Power Harness
65
Fuel System
67
Corrosion Control Anode
69
Propeller Replacement-31.75 MM (1-1/4 In.) Diameter Propeller Shaft
70
Spark Plug Inspection and Replacement
71
Fuses
74
Alternator Drive Belt
76
Lubrication Points
76
Trim Thrust Guide Wear Pad
78
Checking Power Trim Fluid (Single-Ram Trim)
79
Checking Hydraulic Steering Fluid
80
Checking Power Steering Fluid
80
Changing Engine Oil and Filter
81
Checking Engine Oil Level
86
Exhaust Water Strainer Inspection
87
Gearcase Lubricant
88
Storage Preparation
91
Protecting External Outboard Components
91
Protecting Internal Engine Components
92
Gearcase
92
Positioning Outboard for Storage
92
Battery Storage
92
Starter Motor will Not Crank the Engine
93
Engine will Not Start
93
Engine Runs Erratically
93
Troubleshooting
93
Performance Loss
94
Battery will Not Hold Charge
94
Service Assistance
95
Owner Service Assistance
95
Ordering Literature
97
Maintenance Log
99
4
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Mercury 300R HD CMS Mechanical Specifications
General
Brand
Mercury
Model
300R HD CMS Mechanical
Category
Outboard Motor
Language
English
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