Part of the Yanmar Operator Manuals.
A ZT370 that shifts late or trims slow usually comes down to something a daily check would have caught: gear oil a little low, trim pump fluid down, an anode half gone. This operator manual for the Yanmar ZT370 stern drive is where those checks live, along with the numbers that stop a job halfway: propeller nut torque, oil capacity, anode replacement limits.
Its 60 pages cover safety, component identification and serial number locations, corrosion protection, propeller selection and installation, daily checks, the periodic maintenance table and procedures, troubleshooting for the remote control, shift linkage, steering and power trim, long term storage, and full specifications, all as Yanmar publication 0AZTD-EN0022, in English.
The download is a bookmarked PDF of 8.19 MB. Print the maintenance table and the torque pages and let them get greasy at the transom; the clean copy stays on your laptop.
What's Inside This Yanmar ZT370 Operator Manual
| System | Pages | Key Topics |
|---|---|---|
| English | 1-2 | - |
| Introduction | 5-6 | Record of Ownership |
| Safety | 7-12 | Safety Precautions (Before You Operate, During Operation and Maintenance) |
| Product Overview | 13-24 | Overview (Owner/Operator Responsibilities, New Stern-Drive Break-In, Dealer/Distributor Responsibilities), Component Identification, Location of Serial Numbers |
| Stern-Drive Operation | 25-32 | Propeller Selection, Installing the Propellers, Removing the Propeller, Daily Checks (Visual Checks, Check the Stern-Drive Oil Level, Check the Power Trim Pump Fluid) |
| Maintenance | 33-52 | Periodic Maintenance (Importance of Periodic Maintenance, Performing Periodic Maintenance, Importance of Daily Checks, Yanmar Replacement Parts, Tools Required, Ask Your Authorized Yanmar Marine Dealer or Distributor for Help) |
| Troubleshooting | 53-54 | Remote Control, Shift and Throttle Linkages, Steering System, Power Steering Pump Fluid, Power Trim System, Gimbal Ring |
| Long-Term Storage | 55-56 | Cold Weather, Seasonal and Extended Storage (Stern-Drive: Lay Up, Recommissioning) |
| Specifications | 57-60 | Reduction Ratio, Propeller, Oil, Clutch System, Shift Type, Anti-Corrosion System |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| O-ring replacement | Use new O-ring seals each time the drive unit is installed | p. 49 |
| Propeller shaft anode bolt torque | 30 N-m | p. 28 |
| Bolt for anode of cylinder part torque | 3.5 ± 0.5 N-m | p. 35 |
| Y-CaPS in-line fuse | 20 A | p. 23 |
| Stern-Drive Oil Capacity | 2.5 l (84.5 oz) | p. 57 |
| Maximum Input Speed | 4500 min-1 (rpm) | p. 57 |
| Steering Angle | 2 × 30 degrees | p. 57 |
| Tilt Angle | 51 degrees | p. 57 |
| Trim Zone | -6 to 10 degrees | p. 57 |
| Front Propeller Nut Torque | 135 N-m (99 lb-ft) | p. 28 |
| Rear Propeller Nut Torque | 80 N-m (59 lb-ft) | p. 28 |
| Gimbal Ring Locknut Torque | 50 N-m (37 lb-ft) | p. 42 |
Yanmar ZT370 Common Problems This Manual Covers
Sluggish or delayed shifting
When the drive hesitates going into gear, the usual suspects are the remote control and the shift and throttle linkages. The Troubleshooting section works through the remote control, linkages, and related systems in order, so you eliminate the cheap causes first.
Manual Section: Troubleshooting p. 53Anodes eroding faster than expected
Galvanic corrosion eats sacrificial anodes before it eats the drive, and Yanmar calls for replacement once an anode is 50 percent or more eroded. The Product Overview section covers the gear housing, ventilation plate, trim cylinder, and propeller shaft anodes, plus the Yanmar cathodic protection system.
Manual Section: Product Overview p. 13Power trim slow or will not hold
A drive that creeps down or trims slowly often traces back to the power trim system or its pump fluid. The Troubleshooting section covers the power trim system along with the steering system and power steering pump fluid.
Manual Section: Troubleshooting p. 53Stern-drive oil running low
Low gear oil overheats a stern drive from the inside, and the level check takes a minute. The Maintenance section lays out the periodic maintenance table and procedures so the oil gets checked and changed before it costs you a gearcase.
Manual Section: Maintenance p. 33Propeller nuts loose or mis-torqued
A propeller nut that was guessed rather than torqued is how props get lost. The Stern-Drive Operation section covers propeller selection, installation, and removal, with the front nut torqued to 135 N-m (99 lb-ft) and the rear to 80 N-m (59 lb-ft).
Manual Section: Stern-Drive Operation p. 25Freeze damage after winter layup
A drive stored wrong through a cold winter shows the damage at spring launch. The Long-Term Storage section covers cold weather precautions, lay up, and recommissioning for the stern drive.
Manual Section: Long-Term Storage p. 55Frequently Asked Questions
Which drive does this manual cover?
The Yanmar ZT370 stern drive. This is Yanmar operator manual publication 0AZTD-EN0022, in English, 60 pages, covering operation, daily checks, periodic maintenance, troubleshooting, long term storage, and specifications.
Does it include torque specifications?
Yes. The Maintenance section includes standard torque values and a torque specifications chart, and the propeller installation procedure specifies 135 N-m (99 lb-ft) for the front propeller nut and 80 N-m (59 lb-ft) for the rear. p. 33
What is the stern-drive oil capacity for the Yanmar ZT370?
2.5 l (84.5 oz). The Specifications section also lists a maximum input speed of 4500 rpm, steering angle of 2 x 30 degrees, tilt angle of 51 degrees, and a trim zone of -6 to 10 degrees. p. 57
When should the anodes be replaced?
When an anode is 50 percent or more eroded. The Product Overview section covers every anode location, gear housing plates, ventilation plate, trim cylinders, and propeller shaft, along with the Yanmar cathodic protection system and its 20 A in-line fuse. p. 13
Is this Yanmar ZT370 Operator Manual a digital download?
You get a 60-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Can I print this manual?
The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
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