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 TM 55-1905-217-34
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Replace damaged parts found (para 3-23).
2. Low oil pressure.
Condition A--When selector valve is placed in any position: forward, neutral or reverse.
Step 1. Check for faulty oil pump relief valve.
Repair relief valve (para 3-11).
Step 2. Check for faulty oil pump.
Overhaul oil pump (para 3-11).
Step 3. Check for defective dump valve.
Repair marine gear dump valve (para 3-26).
Condition B--When selector valve is placed in forward.
Step 1. Check for broken or worn forward piston seals.
Remove and replace the forward piston seal rings (para 3-26).
Step 2. Check for leaking pilot bearing oil seal.
Remove and replace the pilot bearing oil seal (para 3-26).
Step 3. Check for improper operation of dump valve.
Remove the dump valve and clean and inspect the seating surfaces. Replace damaged parts (para
Step 4. Check for faulty flywheel.
Inspect the flywheel and replaceloose or missing passage plugs (para 3-19).
Check for the emergency engagement bolts for tightness. Tighten loose bolts (para 3-26)
Step 5. Check for damaged drive shaft seal rings.
Replace if found worn or damaged (para 3-26).
Condition C--When selector valve is placed in reverse.
Check for broken or worn reverse piston seals.
Remove and replace the reverse piston seal rings (para 3-26).
3. Gear dragging: Drive shaft rotates with selector valve in neutral.
Condition A--After moving selector valve from forward to neutral.
Step 1. Check for sticking forward clutch plate. Inspect the clutch plate for wear.
If facings have worn smooth the clutch plate should be replaced (para 3-26).
Step 2. Check the forward clutch plate for broken or loose facing material. This material may lodge
between the clutch plate and piston or the reaction plate.
Refer to para 3-26.
Step 3. Inspect the forward piston drive pins for burrs that could prevent the piston from moving into the
disengaged position.
Burred pins should be replaced with new pins (para 3-26)
Step 4. Check the flatness of the forward piston.
Replace if warped (para 3-26)
Step 5. Inspect the planetary assembly for areas of bind.
Overhaul and replace damaged parts.
Step 6. Inspect the dump valve for varnish or foreign material which may prevent the valve from
functioning properly.
Clean or replace damaged parts (para 3-26).
Step 7. Inspect the seal rings on the drive shaft for wear or breakage.
Replace faulty parts (para 3-26).
Condition B--After moving selector valve from reverse to neutral.
Step 1. Inspect the reverse clutch plate for wear.
Step 2. Check the reverse clutch plate for broken or loose facing material. This material may lodge
between the clutch plate and piston or the reaction plate.
Refer to para 3-26.
Step 3. Inspect the reverse piston drive pins for burrs that could prevent the piston from moving into the
disengaged position.
Burred pins should be replaced with new pins (para 3-26).
Step 4. Check the flatness of the reverse piston.
Replace if warped (para 3-26).
Step 5. Inspect the planetary gear assembly for areas of bind.
Overhaul and replace damaged parts (para 3-26).
4. Gear slipping or slow to engage.
Condition A--With selector valve in forward position.
Step 1. Check for low oil pressure.
Refer to 2. Low oil pressure above.
Step 2. Check the flatness of the forward piston and reaction plate.
Replace if badly warped (para 3-26).
Step 3. Inspect the clutch facings for wear.
If the facings are badly worn the clutch plate should be replaced (para 3-26).
Step 4. Inspect the dump valves for varnish or foreign material which may prevent the valves from
functioning properly.
Clean or replace damaged parts (para 3-26).
Condition B--With selector valve in reverse position.
Step 1. Check for low oil pressure.
Refer to 2. Low oil pressure above.
2-5
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