Yanmar ZT370 Operation Manual
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Yanmar ZT370 Operation Manual

Stern-drive
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OPERATION MANUAL
STERN-DRIVE
ZT370
en
English

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Summary of Contents for Yanmar ZT370

  • Page 1 OPERATION MANUAL STERN-DRIVE ZT370 English...
  • Page 2 We reserve the right to make any change at any time without notice. Yanmar and are registered trademarks of YANMAR CO., LTD. in Japan, the United States and/or other countries. All Rights Reserved:...

  • Page 3: Table Of Contents

    Trim Cylinder Anodes ........15 Propeller Shaft Anode ........15 Features and Controls..........16 Remote Controls..........16 Power Trim ............16 Stern-Drive Trim Angle ........17 Trim and Tilt/Trailering Switch ......17 Electrical System ..........18 Yanmar Cathodic Protection System....19 ZT370 Operation Manual...
  • Page 4 Performing Periodic Maintenance ...... 30 The Importance of Daily Checks ......30 Yanmar Replacement Parts ....... 30 Tools Required........... 30 Ask Your Authorized Yanmar Marine Dealer or Distributor for Help ......... 30 Tightening Fasteners..........31 Torque Charts............31 Standard Torque Values ........31 Torque Specifications.........

  • Page 5: Introduction

    ZT370 Operation Manual INTRODUCTION • Make sure this manual is transferred to Welcome to the world of Yanmar Marine! Yanmar Marine offers engines, stern-drive subsequent owners. This manual should systems and accessories for all types of be considered a permanent part of the vessels, from runabouts to sailboats, and vessel and remain with it.

  • Page 6: Record Of Ownership

    INTRODUCTION RECORD OF OWNERSHIP Take a few moments to record the information you need when you contact Yanmar for service, parts or literature. Stern-Drive Model:_______________________________________________________ Stern-Drive Transom Assembly Serial No.:___________________________________ Stern-Drive Unit Serial No.:________________________________________________ Stern-Drive Gear Ratio: ___________________________________________________ Date Purchased:_________________________________________________________...

  • Page 7: Safety

    ZT370 Operation Manual SAFETY Yanmar considers safety of great DANGER importance and recommends that anyone that comes into close contact with its DANGER indicates a hazardous products, such as those who install, situation which, if not avoided, will operate, maintain or service Yanmar result in death or serious injury.

  • Page 8: Safety Precautions

    • Safety signs and labels are additional reminders for safe operating and maintenance techniques. • Consult your authorized Yanmar Marine dealer or distributor for additional training. ZT370 Operation Manual...
  • Page 9 In when feeling ill. multi-engine configurations, the propeller for an engine that is shut down may rotate if any of the other engines are running. ZT370 Operation Manual...
  • Page 10 Burn Hazard connectors. Some of the engine and stern-drive surfaces become very hot during operation and shortly after shutdown. Keep hands and other body parts away from hot surfaces. ZT370 Operation Manual...
  • Page 11 Always tighten components to the specified torque. Loose parts can cause equipment damage or cause it to operate improperly. ZT370 Operation Manual...
  • Page 12 This will keep the anodes in the water and will keep the exhaust pipe engaged with the exhaust port of the drive. ZT370 Operation Manual...

  • Page 13: Product Overview

    • Have an authorized Yanmar Marine dealer/distributor perform periodic • During the break-in period, carefully checkups. observe stern-drive indicators (if any) for proper stern-drive function.

  • Page 14: Dealer/Distributor Responsibilities

    • Ensure that the vessel is properly equipped. • Prior to delivery, make certain that the Yanmar stern-drive and other equipment are in proper operating condition. • Make all necessary adjustments for maximum efficiency. • Familiarize the customer with the on-board equipment.

  • Page 15: Component Identification

    PRODUCT OVERVIEW 12/05 COMPONENT IDENTIFICATION Transom assembly Steering system location Drive unit Y-CaPS electrode Antiventilation plate Trim cylinder 039031-00E01 Figure 1 ZT370 Operation Manual...

  • Page 16: Location Of Serial Numbers

    PRODUCT OVERVIEW Location of Serial Numbers The serial numbers are the manufacturer’s keys to numerous engineering details which apply to your Yanmar stern-drive. When contacting Yanmar about service, always specify model and serial numbers. Transom assembly serial number 039032-00E00 Drive unit...

  • Page 17: Corrosion Protection

    Galvanic isolators are corrosion, Yanmar Marine ZT370 available from the aftermarket (not stern-drives come with several anodes and supplied by Yanmar) to block these an electronic anticorrosion system currents while still providing a path to (Y-CaPS) that protect the stern-drive in ground for dangerous shock currents.

  • Page 18: Underwater Drive Coating

    Y-CaPS or other items specified by the anode manufacturer. Consult your authorized Yanmar Marine dealer or distributor for assistance. Trim cylinder anodes Galvanic corrosion damage, normal maintenance and consumable parts are Y-CaPS not covered by the Yanmar limited electrode Gear warranty. Ventilation housing plate anode anodic...

  • Page 19: Gear Housing Anodic Plates

    The propeller shaft anode (1, Figure 7) is The ventilation plate anode (1, Figure 5) is located behind the aft propeller. installed on the front of the drive shaft housing on top of the ventilation plate. 039036-00X00 Figure 7 039034-00X00 Figure 5 ZT370 Operation Manual...

  • Page 20: Features And Controls

    PRODUCT OVERVIEW FEATURES AND CONTROLS Remote Controls The Yanmar ZT370 can be controlled mechanically with push-pull cables or electronically. Please refer to the Yanmar Engine Operation Manual or the Electronic Control System Operation Manual (if so equipped). Power Trim The power trim is used to accelerate the vessel onto plane, reach the desired engine rpm or vessel speed, and improve the performance of the vessel when there is a change in water or boating conditions.

  • Page 21: Stern-Drive Trim Angle

    CAUTION Always raise and lower dual stern-drives evenly together. Damage to the tie bar connecting the two stern-drives together could result from twisting or binding if the stern-drives are raised or lowered separately. ZT370 Operation Manual...

  • Page 22: Electrical System

    Correct the cause of the electrical overload before operating the trim system. If the electrical overload problem still exists, consult your authorized Yanmar Marine dealer or distributor. 039038-00X00 Figure 11 ZT370 Operation Manual...

  • Page 23: Yanmar Cathodic Protection System

    12/05 Yanmar Cathodic Protection System The Yanmar Cathodic Protection System (Y-CaPS) has a 20 A in-line fuse (Figure 12) in the wire which connects to the positive (+) terminal on the controller. If the fuse blows, the system will not operate resulting in a loss of corrosion protection.
  • Page 24 PRODUCT OVERVIEW This Page Intentionally Left Blank ZT370 Operation Manual...

  • Page 25: Zt370 Operation Manual

    STERN-DRIVE ZT370 Operation Manual OPERATION This section of the Operation Manual describes the procedures for proper operation of the stern-drive. Before you operate the ZT370, read the following safety information and review Safety on page 3. ZT370 Operation Manual...

  • Page 26: Propeller Selection

    Keep these guidelines in mind when selecting a propeller: The propeller converts the engine’s power • Your Yanmar Marine dealer or distributor into the thrust needed to propel the vessel. is most qualified to help you select a Careful selection of your propeller is very propeller.

  • Page 27: Installing The Propellers

    6 – Front propeller thrust hub 7 – Propeller shaft anode 2 – Rear propeller 8 – Propeller shaft anode bolt and 3 – Rear propeller thrust hub washer 4 – Front propeller nut 5 – Front propeller Figure 1 ZT370 Operation Manual...
  • Page 28 8. Install the propeller shaft anode bolt 4. Install and torque the front propeller with a washer. Torque the bolt. nut. Check the propeller at least every 20 hours. Propeller shaft anode bolt torque N·m lb-ft Front propeller nut torque N·m lb-ft ZT370 Operation Manual...

  • Page 29: Removing The Propeller

    5. Slide the propeller and the thrust hub 2. Check for damaged or missing parts. off the propeller shaft. 3. Check for loose, missing or damaged fasteners. 4. Check the electrical harnesses for cracks, abrasions, and damaged or corroded connectors. ZT370 Operation Manual...

  • Page 30: Check The Stern-Drive Oil Level

    ®*1 Quick Silver plug and/or if oil appears discolored, series High Performance consult your authorized Yanmar Marine Gear Lube or 6LPA dealer or distributor immediately. Both GL-5 (SAE 80W90) series Oil reservoir conditions may indicate a water leak somewhere in the stern-drive.

  • Page 31: Check The Power Trim Pump Fluid

    See Fill the power trim pump fluid on page 28. Check the Power Trim Pump Fluid Always check the oil level with stern-drive in the full DOWN/TRIM-IN position. 1. Place the stern-drive in full DOWN/TRIM-IN position. ZT370 Operation Manual...

  • Page 32: Fill Power Trim Pump Fluid

    ■ Fill the power trim pump fluid Note: The power trim fluid does not require changing unless it becomes contaminated with water or debris. Consult your authorized Yanmar Marine dealer or distributor if the power trim fluid needs to be changed.

  • Page 33: Maintenance

    ZT370 Operation Manual MAINTENANCE This section of the Operation Manual describes the procedures for proper care and maintenance of the stern-drive. Before you operate the ZT370, read the following safety information and review Safety on page 3 . ZT370 Operation Manual...

  • Page 34: Periodic Maintenance

    Yanmar Replacement Parts indicated. Failure to follow these Yanmar recommends using genuine guidelines will impair the stern-drive’s Yanmar parts when replacement parts are safety and performance characteristics, necessary. Genuine replacement parts shorten the stern-drive’s life and may help ensure long life.

  • Page 35: Tightening Fasteners

    Bolt for rear of inner propeller 1 - 14 UNS 80 ± 5.0 N·m 59 ± 3.7 lb-ft shaft Bolt for rear of outer propeller 2-1/8 - 16 UNS 135 ± 5.0 N·m 100 ± 3.7 lb-ft shaft ZT370 Operation Manual...

  • Page 36: Periodic Maintenance Table

    MAINTENANCE PERIODIC MAINTENANCE TABLE : Check or clean : Replace ●: Consult your authorized Yanmar Marine dealer or distributor Daily Every Every See Daily Every 50 Every Weekly Checks on hours year hours hours page 25 Before Check the stern-drive oil level...
  • Page 37 MAINTENANCE 12/05 : Check or clean : Replace ●: Consult your authorized Yanmar Marine dealer or distributor Daily Every Every See Daily Every 50 Every Weekly Checks on hours year hours hours page 25 Check the circuit for loose or ...

  • Page 38: General Inspection

    Consult your authorized problems before they occur. Yanmar Marine dealer or distributor if the power trim fluid needs to be changed. Check for loose, damaged or missing parts, hoses and clamps. Tighten or replace as needed.

  • Page 39: Periodic Maintenance Procedures

    See Corrosion Protection on page 13. ■ Checking the oil level Check the stern-drive oil level within one week of the first use as follows: 1. Remove the oil vent plug (1, Figure 1) and gasket (2, Figure 1). ZT370 Operation Manual...

  • Page 40: After Initial 50 Hours Of Operation

    NLGI #2 (1, Figure 2) to lubricate the engine coupler splines through the grease fittings, Note: Lubricate the coupler on the ZT370 if equipped. Use a typical hand-operated model every 50 hours if the vessel is grease gun to apply the grease.

  • Page 41: Every 50 Hours Of Operation

    • Lubricating the cable and the linkages ■ Lubricating the propeller shaft and retorqueing the nut If operating in only freshwater, this maintenance may be extended to every four months. See Installing the Propellers on page 23. ZT370 Operation Manual...
  • Page 42 ■ Inspecting the bellows and the clamps See General Inspection on page 34. ■ Checking the engine alignment Consult your authorized Yanmar Marine dealer or distributor. ■ Lubricating the steering shaft bushing Apply approximately 8 to 10 pumps of grease to the steering shaft bushing grease fitting (1, Figure 4).
  • Page 43 ■ Checking the circuit for loose or damaged connections Check the electrical connections and leads for damage and corrosion. ■ Testing the Y-CaPS unit output See Yanmar Cathodic Protection System on page 19. ■ Checking the steering system for loose, missing or damaged parts 039079-00X00...

  • Page 44: Every 150 Hours Of Operation

    (1, Figure 8) and the guide contact page 41. surfaces (2, Figure 8). 039081-00X00 Figure 8 Description Where used SAE 30 engine oil Shift cable pivot points Lithium grease with Guide contact surfaces PTFE and cable end ZT370 Operation Manual...

  • Page 45: Every 250 Hours Of Operation

    ■ Changing the stern-drive oil operated. If using copper- or tin-based anti-fouling paint, avoid an electrical Note: The stern-drive oil must be changed interconnection between the Yanmar every 250 hours or every year, Product, anodic blocks, or Y-CaPS and the whichever comes first.

  • Page 46: Changing The Stern-Drive Oil

    4. Place the stern-drive in full trim limit may be leaking and should be checked OUT position. immediately by your authorized Yanmar 5. Remove the oil fill/drain plug Marine dealer or distributor. (1, Figure 11) and gasket (2, Figure 11).
  • Page 47 Oil vent plug torque 14.Ensure that the rubber gasket is inside N·m lb-ft the cap and install the cap. 12.Continue to pump gear oil into the oil reservoir circuit until the gear oil Never over-tighten. appears in the oil reservoir. ZT370 Operation Manual...
  • Page 48 3- Install the oil vent plug and gasket. Torque the oil vent plug. Oil level in the oil reservoir will rise and fall during stern-drive operation; always check the level when the stern-drive is cool and the engine is shut down. ZT370 Operation Manual...
  • Page 49 Remove the drive unit and lubricate the universal-joint shaft splines (1, Figure 17) and the O-rings (2, Figure 17). 039066-00X00 Figure 17 Description Where used Multi-purpose heavy-duty type Universal-joint shaft splines and lithium grease, NLGI #2 O-rings Use new O-ring seals each time the drive unit is installed. ZT370 Operation Manual...

  • Page 50: Every 1000 Hours Of Operation

    Torque the rear engine mount bolts commercial applications only) (1, Figure 18). ■ Replace of friction disc (Light duty commercial applications only) Consult your authorized Yanmar Marine dealer or distributor. 039078-00X00 Figure 18 Engine rear mount bolt torque N·m lb-ft...

  • Page 51: Every Year

    39. linkages ■ Testing the Y-CaPS unit output • Touching-up the stern-drive paint and See Yanmar Cathodic Protection System spray with corrosion guard on page 19. • Changing the stern-drive oil ■ Checking the steering system for •...

  • Page 52: Every 2 Years

    • Replace control cable bellows See Touching-up the stern-drive paint and ■ Replace U-joint bellows spray with corrosion guard on page 41. Consult your authorized Yanmar Marine ■ Changing the stern-drive oil dealer or distributor. See Changing the stern-drive oil on ■...

  • Page 53: Troubleshooting

    ZT370 Operation Manual TROUBLESHOOTING Reference Problem Possible cause Action page Remote control operates Insufficient lubrication on Lubricate. hard, binds, has excessive the shift and throttle (if free play or makes unusual applied) linkage fasteners. sounds Obstruction in the shift or Remove the obstruction.
  • Page 54 Power trim does not operate Trim pump oil level is low. Fill pump with oil. (Electric motor operates but Stern-drive binding in Check for obstruction. stern-drive does not move) gimbal ring. Consult your authorized – Yanmar Marine dealer or distributor. ZT370 Operation Manual...

  • Page 55: Long-Term Storage

    SEASONAL AND EXTENDED ensure that they are open. STORAGE Second anode cavity drain passage Yanmar strongly recommends that this service be performed by an authorized Under side of Yanmar Marine dealer or distributor. gear housing Damage caused by freezing is not covered by the Yanmar warranty.

  • Page 56: Stern-Drive Recommissioning

    Stern-Drive Recommissioning 1. Carefully inspect the stern-drive for leaks. 2. Check the steering system, shift and throttle control for proper operation. ZT370 Operation Manual...

  • Page 57: Specifications

    ZT370 Operation Manual SPECIFICATIONS Stern-drive model ZT370 Yanmar BY3 series 6LPA series 8LV series 1.65 Applicable 1.78 1.65 1.65 engine Reduction ratio 1.97 1.78 1.78 2.18 Maximum input speed 4500 min (rpm) Direction of Input Counter-clockwise viewed from stern rotation...
  • Page 58 Dry condition 100 kg (220.5 lb) *1: Quick Silver is a registered trademark of Brunswick Corporation. Note: For engine/stern-drive performance, electrical, outline, piping diagrams and related information, see the engine-specific section of Installation Manual and/or the Service Manual. ZT370 Operation Manual...
  • Page 59 ZT370 1st edition: March 2011 1st edition 2nd rev.: September 2011 1st edition 3rd rev.: February 2012 2nd edition: March 2013 3rd edition: October 2013 Issued by: YANMAR CO., LTD. Marine Operations Division Edited by: YANMAR TECHNICAL SERVICE CO., LTD.
  • Page 60 0AZTD-EN0022 http://yanmar.com...

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