Need the exact factory procedures to tear down your marine stern drive? This 333-page Yanmar ZT350 service manual PDF breaks down the entire driveshaft housing, gear assembly, and transom systems. You get complete wiring diagrams for the electric shifter, hydraulic component diagrams for the power trim pump, and an entire section dedicated to performance troubleshooting. Open up to exploded views of the universal joint and clutch, backed by page after page of maintenance intervals and diagnostic fault codes. Lock down the front propeller nut to exactly 135 N·m (99 lb-ft) and verify your maximum input speed stays at 4500 rpm before hitting the water. A blown seal miles from the dock is a nightmare. Download the bookmarked file directly to your tablet, tap straight to the spec, and keep your drive out of the shop.
What's Inside This Yanmar ZT350 Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 10-11 | Revision History |
| Safety | 12-17 | Crush Hazard, Fire and Explosion Hazard, Electrical Hazard, Exhaust Hazard, Entanglement Hazard, Lifting Hazard |
| General Service Information | 18-47 | Responsibilities (Owner / Operator Responsibilities, Dealer / Distributor Responsibilities), Specifications, Identification (Transom Assembly, Stern Drive Assembly) |
| Maintenance | 48-71 | Safety Precautions, Checking, Filling and Changing Stern Drive Oil (Checking Stern Drive Oil Reservoir Level), Checking and Filling Power Trim Pump Fluid |
| Stern Drive | 72-91 | Safety Precautions, Component Identification, Stern Drive Removal From Transom Assembly, Stern Drive Installation to Transom Assembly, Stern Drive Driveshaft Alignment |
| Driveshaft Housing | 92-137 | Safety Precautions, Driveshaft Housing Part Diagrams (Driveshaft Housing and Drive Gear, Universal Joint and Clutch, Case Plate and Shifter), Driveshaft Housing Disassembly |
| Gear Housing | 138-195 | Safety Precautions, General Views, Gear Housing Part Diagrams, Disassembly and Inspection, Gear Housing Assembly |
| Transom Assembly | 196-261 | Safety Precautions, General Views, Transom Assembly Part Diagrams, Gimbal Housing Disassembly, Gimbal Housing Assembly, Tilt-Up Limit Spacer, Speedometer Connection |
| Shift Cable | 262-273 | Safety Precautions, Control Cables, Shift Cable Installation and Adjustment |
| Steering | 274-285 | Safety Precautions, Power Steering Unit Parts Diagram, Steering Cable Specifications, Installation of Steering Cable, Connecting Steering Cables, Power Steering Unit Installation |
| Power Trim System | 286-297 | Safety Precautions, Power Trim Pump Parts Diagram, Power Trim Cylinders Parts Diagram, Power Trim Pump Fluid, Power Trim Cylinders, Power Trim Troubleshooting |
| Propellers | 298-309 | Safety Precautions, Propeller Selection, Propeller Installation, Removing Propellers |
| Corrosion Protection | 310-319 | Safety Precautions, Corrosion Control Parts Diagram, Galvanic Corrosion, Corrosion Control, Shore Power, Underwater Drive Coating, Additional Protection |
| Troubleshooting and Testing | 320-333 | Safety Precautions, Stern Drive Unit Troubleshooting, Performance Troubleshooting, Power Steering Troubleshooting, Power Trim System Troubleshooting, Stern Drive Testing |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Front Propeller Nut Torque | 135 N·m (99 lb-ft) | p. 308 |
| Maximum Input Speed | 4500 rpm | p. 21 |
| Dry Mass (Weight) | 100 kg | p. 21 |
| Standard Bolt M12 Torque | 43-47 N·m | p. 24 |
| Transom Assembly Hinge Bolt M16 Torque | 130-140 N·m | p. 25 |
| Stern Drive Assembly Universal Joint Nut M20 Torque | 190-210 N·m | p. 25 |
| Propeller Nut Outer Torque | 130-140 N·m | p. 25 |
Yanmar ZT350 Common Problems This Manual Covers
Yanmar ZT350 stern drive will not shift reliably or engages harshly with abnormal grinding noise. p. 320
Drain and inspect the stern drive oil for metal particles or water intrusion. If the fluid is contaminated, disassemble the unit and inspect the universal joint. Torque the M20 universal joint nut to 190-210 N·m during reassembly as outlined on page 25.
Manual Section: Stern Drive Unit TroubleshootingOil level drops below the add line or visible oil leak appears on the transom assembly. p. 48
Trim the drive to the full down position before checking the reservoir level. Inspect the transom assembly hinge bolts for leaks. Tighten any loose M16 hinge bolts to 130-140 N·m as specified on page 25. Check the external seals for damage and replace if necessary.
Manual Section: MaintenanceHarsh engagement and poor maneuverability with noticeable propeller ventilation during wide open throttle operation. p. 298
Remove the propellers on page 298 and check the shaft for debris or damage. Verify the correct propeller installation sequence. Torque the front propeller nut to 135 N·m (99 lb-ft) as shown on page 308. Ensure the engine does not exceed the maximum input speed of 4500 rpm.
Manual Section: PropellersHard shifting into forward or reverse gears with restricted drive unit shift cable movement. p. 262
Inspect the shift cable installation and adjustment points starting on page 262. Verify the inner core wire is not broken and the clearance is correct. Torque the standard M12 mounting bolts to 43-47 N·m as specified on page 24. Replace the control cables if movement remains stiff.
Manual Section: Shift CableFrequently Asked Questions
What is the torque spec for Yanmar ZT350 propeller nuts?
The tightening torque for the rear propeller nut is 80 N·m (59 lb-ft), and for the front propeller nut, it is 135 N·m (99 lb-ft). Additionally, the propeller shaft anode bolt torque is 30 N·m (22 lb-ft).
What is the torque spec for Yanmar ZT350 stern-drive universal joint nut?
The universal joint nut on the Yanmar ZT350 stern drive should be tightened to a torque of 190-210 N·m (140-154 lb-ft). This specification is found in the Stern Drive Assembly tightening torques table.
What is the recommended oil capacity and fluid type for the Yanmar ZT350 stern drive?
The Yanmar ZT350 stern drive requires a capacity of 2500 mL (85 oz) of GL-5 Hypoid Gear Oil. This information is provided in the section for filling the stern drive oil reservoir.
What type of fluid is recommended for the Yanmar ZT350 power trim pump?
The Yanmar ZT350 power trim pump uses Dextron 3 Automatic Transmission Fluid. This fluid type is specified for checking and filling the power trim pump.
What format is this manual in?
This is a 333-page searchable PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Is this Yanmar ZT350 Service Manual printable?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Does this Service Manual have electrical diagrams?
Complete wiring diagrams are included, covering all electrical circuits, harness routing, and connector pinouts for the Yanmar ZT350.
Document Quality
This document is a scanned PDF, not a native digital file. You can search the full text, as an OCR layer is present, though text selection may occasionally be imperfect. The text is clear and readable, despite a slight pixelation inherent to scanned documents. All diagrams and illustrations are raster images, but their labels are generally readable. The pages are clean with a consistent light gray scanned background, and there are several clearly marked "This Page Intentionally Left Blank" filler pages.
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