All 46 pages of this Yanmar Marine Gear Operation Manual (OEM #0AKMH-G00201) are built around one job: keeping your KMH60A, KMH61A, or KMH61V transmission shifting clean and running right. Inside: complete marine gear oil specifications, a daily visual check routine, and step-by-step shifting procedures for normal operation, towing, and anchoring. You also get a full torque chart covering every fastener from M6 through M14, a periodic maintenance schedule with 50-hour and 250-hour service intervals, a troubleshooting chart, and detailed coverage of optional accessories including electric and mechanical trolling valves. Fill the KMH60A or KMH61A to 2.8 L (3.0 qt) without a heat exchanger, and torque transmission M10 assembly bolts to 37.2–41.2 N·m (27.5–30.4 lb-ft). Your gear is in, the engine's running, and you need the right spec now. Bookmarked and searchable; pull it up dockside on any device.
What's Inside This Yanmar KMH60A, KMH61A, KMH61V Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 5-6 | Record of Ownership |
| Safety | 7-12 | Safety Precautions (Before You Operate, During Operation and Maintenance) |
| Product Overview | 13-16 | Component Identification, Nameplate (Significance of Marine Gear Designations), Technical Data |
| Marine Gear Operation | 17-22 | Before Operating the Marine Gear (Marine Gear Oil Specifications), Daily Checks (Visual Checks), Shifting the Marine Gear, Towing or Anchoring |
| Maintenance | 23-34 | Tightening Fasteners (Torque Charts, Standard Torque Values, Torque Specifications) |
| Troubleshooting | 35-36 | Troubleshooting Chart |
| Specifications | 37-40 | Outline Drawings (Kmh60A, Kmh61A, KMH61V) |
| Optional Accessories | 41-46 | Electric Shift Valve (Installation of Electric Shift Valve, Emergency Operation of Electric Valve), Trolling Valves (Mechanical Trolling Valve, Electric Trolling Valve) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Standard Torque Value (Cast Iron or Steel) for M6 x 1.0 bolts | 10.8 ± 1.0 N·m (8.0 ± 0.8 lb-ft) | p. 27 |
| Standard Torque Value (Cast Iron or Steel) for M8 x 1.25 bolts | 25.5 ± 2.0 N·m (18.8 ± 1.5 lb-ft) | p. 27 |
| Transmission Assembly Bolts (M8) | 18.6 - 22.6 N·m (13.7 - 16.7 lb-ft) | p. 27 |
| Transmission Assembly Bolts (M10) | 37.2 - 41.2 N·m (27.5 - 30.4 lb-ft) | p. 27 |
| Oil Capacity without Heat Exchanger (Available) | 2.8 L (3.0 qt) | p. 16 |
| Oil Capacity without Heat Exchanger (Effective) | 0.5 L (0.5 qt) | p. 16 |
| Oil Strainer Cleaning/Replacement Interval | Every 250 hours or one year, whichever comes first | p. 29 |
| Electric Trolling Valve Oil Filter Element Replacement Interval | Every 250 hours or one year, whichever comes first | p. 29 |
| Drain Plug Torque | 29.4 ± 2.0 N·m (21.7 ± 1.5 lb-ft) | p. 27 |
| Shift Lever Bolt Torque | 39.2 ± 2.0 N·m (28.9 ± 1.5 lb-ft) | p. 27 |
| Shift Type | Mechanical Cable | p. 37 |
| Hose Clamps for Cooler Torque | 2.5 - 3.4 N·m (1.8 - 2.5 lb-ft) | p. 27 |
Yanmar KMH60A, KMH61A, KMH61V Common Problems This Manual Covers
Yanmar KMH60A marine gear slips out of forward or reverse, no propulsive drive after shifting p. 35
Check oil level immediately using the dipstick on page 20. On KMH60A and KMH61A, available capacity is 2.8 L (3.0 qt); on KMH61V, 7.5 L (7.9 qt). Top up with SAE 30 Class CD or higher oil per page 18. Remove and inspect the oil strainer for blockage — replace it if it's past the 250-hour or one-year service interval on page 29. If oil is dark, burnt-smelling, or water-contaminated, drain and refill before further diagnosis.
Manual Section: TroubleshootingOil temperature climbs above normal range during operation, gear runs hot p. 35
Verify oil level first: low and high both cause overheating. Normal operating temperature is 50° to 80°C (122° to 176°F) per page 21. Check coolant flow through the heat exchanger. If temperature stays high, remove and flush the heat exchanger for restriction or sediment buildup. Inspect hose clamps and fittings; torque clamps to 2.5–3.4 N·m (1.8–2.5 lb-ft) and cooler hose fittings (3/4-16) to 49 ± 0.49 N·m (36.1 ± 0.36 lb-ft) per page 27.
Manual Section: TroubleshootingShift lever feels stiff or binding when selecting neutral, forward, or reverse p. 35
Start at the mechanical cable, not inside the gear. Check the selector control and linkage for corrosion, kinks, or cable end binding per the troubleshooting chart on page 35. Work the lever through its range; confirm it moves freely before suspecting internal clutch wear. If the shift lever bolt was recently disturbed, torque it to 39.2 ± 2.0 N·m (28.9 ± 1.5 lb-ft) per page 27. Lubricate cable and pivot points, then re-test.
Manual Section: Hard ShiftingGear engages slowly or with a noticeable delay, especially in cold weather into forward p. 35
Check oil level and oil condition before anything else. Thin or degraded oil loses hydraulic pressure faster in cold temperatures. Confirm oil meets SAE 30 Class CD or higher per page 18; replace at the 250-hour or one-year interval on page 29. Inspect the selector control and linkage for free movement per page 35. If delay persists with correct oil and free linkage, suspect internal wear requiring disassembly.
Manual Section: Slow EngagementOil leaking from gear housing, drain plug area, or around the oil strainer p. 35
Inspect all fasteners, the dipstick seal, oil strainer fitting, and drain plug for looseness or damaged seals per page 35. Torque drain plugs to 29.4 ± 2.0 N·m (21.7 ± 1.5 lb-ft) per page 27. Replace drain plug seal if compressed or cracked. Clean the area dry, run the engine briefly, then trace the wet trail back to its source before assuming a major seal failure. If oil appears milky or discolored, check for heat exchanger damage per the Oil and Water Mixed entry on page 35.
Manual Section: Oil Leakage from Marine Gear HousingNo boat movement after shifting, engine runs normally but shaft does not turn p. 35
Verify the selector is fully engaged in forward or reverse, not riding between positions per page 35. Check oil level; KMH60A and KMH61A take 2.8 L (3.0 qt), KMH61V takes 7.5 L (7.9 qt) without a heat exchanger, per page 16. Inspect the propeller for damage or complete loss before concluding the gear has failed internally. Consult the No Boat Movement section of the troubleshooting chart on page 35 to work through selector, oil, propeller, and gear malfunction causes in order.
Manual Section: No Boat MovementFrequently Asked Questions
What are the torque specs for KMH marine gear mounting bolts?
The manual provides "Standard Torque Values" for bolts with a "7" head (JIS strength classification: 7T). For instance, an M16 x 1.5 bolt on Cast Iron or Steel should be tightened to 225.4 ± 10.0 N·m (166.2 ± 7.4 lb-ft). If specific mounting bolts are not listed in the "Torque Specifications" table, apply 60% torque to unlisted bolts or 80% torque if tightened to aluminum alloy.
How do I check or change the oil in a KMH marine gear?
To check the oil level, remove the dipstick (Figure 2, (1) or Figure 3, (1) on page 20), wipe it, reinsert it, and ensure the oil level is between the upper and lower marks (Figure 4, (2) and (1) or Figure 5, (2) and (1) on page 20). To change the oil, drain it by removing the M16 drain plug (Figure 1, (1) or Figure 2, (1) on page 30), then refill with the specified oil type and quantity. For KMH60A/KMH61A, the oil capacity without a heat exchanger is 2.8 L (3.0 qt), and for KMH61V, it is 7.5 L (7.9 qt).
What causes the KMH60A marine gear to slip or engage roughly?
The troubleshooting chart indicates that problems like "Shifts hard" and "Slow engagement" can be caused by issues with the "Selector control," "Low oil level," or "Linkage." If these actions do not resolve the problem, it is recommended to consult an authorized Yanmar Marine dealer or distributor.
What are the replacement specifications for Yanmar marine gear oil?
The recommended marine gear oil specifications are API service grade Class CD or higher, with a viscosity of SAE 30. Yanmar Marine Super Oil SAE 30 is the recommended oil. It is important to use only the specified SAE 30 oil and never use gear oil, ATF, multi-grade oil, or mix oil types in KMH marine gears.
How quickly can I access this manual after buying?
Immediate download of the complete 46-page searchable Operation Manual. Access it on any device, from a laptop at your desk to a phone in the field.
Is this Yanmar KMH marine gear Operation Manual printable?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
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