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TRANSMISSION TROUBLESHOOTING (ZF MODELS)
Problem
Chattering transmission noise,
mainly at low engine speed.
Transmission shifts into gear,
but fails to propel the boat.
Problem
High fluid temperature.
Fluid on transmission housing.
Fluid and water mixed, shifts hard.
Slow engagement.
No movement of the boat.
Probable Cause
1. The engine or propeller generates torsional
vibrations in the drive unit which produces
a "chattering" noise in the transmission.
1. Oufput coupling is not turning.
2. Propeller shaft is not turning.
Output coupling is turning.
3. Output coupling and
propeller shaft are turning.
Verilicatlon/Remedy
1. Mount a flexible coupling with another stiffness factor
between the transmission and engine. A coupling with
a higher stiffness factor might be sufficient.
1. Transmission needs professional attention.
2. The coupling bolts are sheared or the coupling is slipping
on the propeller shaft. Tighten or replace set screws, keys,
pins and coupling bolts as necessary.
3. Inspect the propeller. It may be missing or damaged.
A folding propeller may be jammed. A variable pitch
propeller may be in "no pitch" position.
HSW TROUBLESHOOTING
Probable Cause
Verllication/Remedy
1. Fluid level high during operation.
1. Pump out fluid to the maximum and mark on dipstick.
2. Fluid level low.
2. Add fluid.
3. Plugged or restricted fluid cooler.
3. Replace cooler and flush water system.
4. No water in cooling system.
4. Check cooling system and repair.
5. Filter clogged (if applicable).
5. Replace element.
1. Loose screws.
1. Tighten to specification.
2. Loose screw connections.
2. Tighten, replace.
. 3. Loose dipstick.
3 • Tighten, replace.
4. Loose fluid filter.
4. Tighten, replace.
5. Fluid level high during operation.
5. Pump out fluid to the maximum and mark on dipstick.
1. Oamage to fluid cooler ..
1. Replace cooler and flush transmission and hoses.
2. Selector control linkage.
2. Refer this manual.
1. Selector control.
1. Refer this manual.
2. I.cw fluid level.
2. Add fluid.
3. Unkage.
3. Adjust (refer this manual.
1. Selector control.
1. Consult service station.
2. Improper selector position.
2. Adjust (see this manual).
3. Low fluid level.
3. Add fluid.
4. Propeller missing.
4. Replace.
5.
Propeller shaft broken.
5. Contact marine repair.
6.
Transmission malfunction.
6.
Contact manufacturer.
7.
Engine malfunction.
7.
ContaCt marine repair.
NOTE:
If
you suspect a major prt}Q.!em ·iWYour transmission, immediately contact your WESTERBEKE dealer or an authorized
marine transmission facility ..
~
WESTERBEKE
Engines
&
Generators
48
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Table of Contents
Troubleshooting
