| Tweet |
Custom Search
|
|
|
||
 TM 55-1905-217-34
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. Wheel turns but rudder does not.
Check for Helm unit failure.
Disassemble helm unit. Clean surfaces in both sections and inspect for
damaged parts. Replace parts as necessary(para 4-13).
4. Noisy operation of pump.
Step 1. See if pump intake is partially blocked.
Service intake strainers. Check internal flow path for cleanliness.
Step 2. Look for air leaks at the intake or shaft seal. (Oil in reservoir would probably be foamy).
Replace seals and be certain all connections are tightened properly (para 4-11).
Step 3. Check for coupling misalignment.
See if shaft seal bearing or other parts have been damaged. Replace
damaged parts and realign the coupled shafts (p ra 4-11).
5. Oil too hot.
Check for relief valve leaking at high pressure.
Disassemble and clean, then repair or replace valve (para 4-21).
6. Rudder angle indicator does not operate.
Check for dead battery.
Replace 1.5V battery (Hull nos. 8520 thru 8560 and 8580 thru 8618).
Ramp Hoist Hydraulic System
1. Noisy operation of pump.
Step 1. Check for partially blocked pump intake.
Service the intake strainers. Check internal flow path for cleanliness.
Step 2. Check for binding in motor or gearbox.
(para 4.18).
3. Brake does not release.
Step 1. Check for leaking piston seals or "O" rings.
Disassemble and replace seals and packings (paras 4-16 and 4-17).
Step 2. Check for seized driving and driven plates.
Disassemble and repair as required (paras 4-16 and 4-17).
4. Erratic action of winch.
Check-for inoperative relief valve.
Disassemble and inspect bushings, plungers, and pistons for defects.
Replace defective parts (paras 4-16 and 4-17).
5. Loss of oil in motor.
Check for defective seal.
Replace seal (paras 4-16 and 4-17).
Section III. REMOVAL AND INSTALLATION OF MAJOR COMPONENTS AND ASSEMBLIES
2-6. General
This section contains removal and installation instructions for the propulsion units, engine room access hatches, and
winches. For removal and installation of the transmission (torquematic marine gear) refer to paragraphs 3-23 and 3-26.
For removal and installation of the ramp hoist winch, refer to para 2-9.
2-7. Engine Room Access Hatch.
a. General. The engine room access hatches are manually removed only when it is necessary to remove the
propulsion unit(s) from the engine room.
b. Removal.
(1) Remove 76 flat head cap screws which attach each access hatch to deck.
(2) If desired, the ventilator cowl(s) may be removed from hatch. Each cowl is secured with five flat head
screws.
(3) Carefully pry up edge of hatch.
CAUTION
Do not damage hatch gasket around edge of hatch.
(4) List up hatch to remove.
(5) Do not remove hatch gasket unless damaged.
c. Cleaning. Remove dirt and other foreign materials with soap and water solution.
d. Installation.
(1) Reverse procedure in b above.
(2) Make sure hatch gasket is seated properly without kinks.
(3) Apply anti-seizing compound to cap screw threads before installing screws.
2-8. Propulsion Units
a. General. The propulsion unit(s) must be removed from the vessel in order to remove or repair the engine oil pump,
crankshaft, main bearings, pistons and connecting rods, liners, oil pan, engine base, and transmission.
2-7
|
||
|
||
