SYMPTOM

PROBABLY CAUSE

REMEDY

A. Low oil pressure

(at full operating speed and temperature)

1. Faulty pressure gauge

2. Low oil level

3. Clogged filter element

4. Clogged suction tube

5. Clogged parts in selector valve, base plate or housing

6. Dirt or sludge in transmission

7. Worn pump assembly

8. Incorrectly adjusted pressure relief valve

9. Oil too hot

10. Worn commutator bushing

11. Incorrect lubricant

12. Scratched clutch cylinders or hard O-ring in clutch cylinders

1. Check gauge against one of known accuracy

2. Inspect gaskets, seals, hoses and fittings for leakage. Pressure test oil cooler-tubes may leak

3. Replace filter element

4. Remove tube and clean with

solvent. Blow dry

5. Flush clean with solvent and blow dry

6. Remove drain plugs, flush gear with commercial solvent or diesel fuel. Start engine; at idle shift gear several times, full forward to full reverse for 3-5 minutes maximum. Shut down engine and drain

7. Refer to oil pump section

(Page 23) or fig. 13, p.17.

8. See fig.13 page 17

9. Check heat exchanger system for clogged oil cooler or hoses.

10. See wear limits chart (p.29)

11. See lube chart (p.18)

12. Replace as necessary (p.31)

B. High Oil pressure (At full operating speed and temperature)

1. Incorrect adjusted pressure relief valve

2. Inoperable relief plunger in base plate

3. Incorrect oil

4. Cold oil

5. Cold oil at start-up

1. Refer to fig.13 p.17

2. Refer to p.23

3. See lube chart (p.18)

4. Check heat exchanger system

5. Transmission should be pre-heated see p.17

C. No Oil Pressure

1. Faulty pressure gauge

2. Broken hose

3. No oil in transmission

1.check pressure with gauge of known accuracy

2. Replace hose. Inspect all hoses

3. Fill with proper oil. See p.18

D. Overheating

1. Insufficient Oil cooler Capacity

2. Insufficient flow of cooling water

3. Clutch slipping

4. Water temperature too high at cooler

1. Install adequate oil cooler

2. Increase water line sizes

3. Refer to symptom A

4. Decrease water temperature to cooler or relocate heat exchanger in cooling system.

E. Excessive noise in transmission

1. Bearings worn or broken

2. Gears worn or broken

3. Noise in forward only

4. Noise in reverse only

5. Improper alignment

1.Inspect bearings for scored races, broken roller, flat -spots, etc.

2. Inspect gears and replace if necessary

3. Reverse position may be mistakenly used for forward. Selector valve lever must point forward when boat is in forward motion.

4. This is normal because more gears are in operation in reverse mode.

5. Refer to section 3, pg.14

F. Noisy Pump

1. Dirt or sludge in oil

2. Clogged hoses

3. Pump cavitation

4. Defective oil pump assembly

1. Remove oil pump and hoses. Clean thoroughly and reinstall

2. Clean and replace as required

3. Oil level may be too low

4. Refer to oil pump section p.23

G. Clutch does not release

1. Transmission is misaligned

2. Improper oil sump

3. Clutch discs warped

4. Forward and reverse clutch cylinders dirty or distorted

5. Rear commutator bushing is worn

6. Incorrect linkage adjustment to selector valve assembly

7. Clutch discs fused due to slippage and overheating

1. Refer to installation section

2. Refer to lube chart

3. Replace as necessary

4. Clean or replace as necessary

5. Replace as necessary. See replacement wear limits chart

6. Adjust linkage

7. Replace as necessary

H. Clutch slipping

1. Low oil pressure

2. Transmission is misaligned

3. Oil temperature is too high

4. Worn clutch discs

5. Incorrect linkage adjustment to selector valve assembly

6. Improper oil

1. See symptom A

2. Refer to installation section

3. Temperature should be 140° to 160°F (60° to 71°C) at selector valve. Check heat exchanger system

4. Replace as necessary, see replacement wear limits chart

5. Adjust linkage

6. See lube chart

I. Clutch burned out

1. Low oil pressure

2. Clutch is shifted at other than engine speed

3. Transmission misaligned

4. Excessive heat

1. See symptom A

2. Install interlock shift controls

3. Check installation and alignment as described in installation section

4. Check cooling system

J. No Neutral

1. Transmission is misaligned

2. Warped clutch discs

3. Scored clutch cylinders

4. Damaged clutch quad rings

5. Worn or damaged commutator bushings (forward or rear)

6. Worn selector valve

1. Refer to installation section

2. Replace as necessary

3. Replace as necessary

4. Replace all 4

5. Replace as necessary. See replacement wear limits chart

6. Replace if necessary. Note: selector valve is the least likely source of trouble

k. Clutch engages too low

1. Cylinder timing screw out of adjustment

1. Remove dome nut and adjust screw (counter-clockwise) to speed up reaction.

L. Clutch engages too fast

1. Cylinder timing screw out of adjustment

1. Remove dome nut and adjust screw in (clockwise) to delay reaction.