RAMP CONTINUES TO LOWER WITH CONTROL VALVE IN NEUTRAL

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STEERING IS SLOW

TM-55-1905-217-12 Landing Craft Mechanized; Steel; DED; Overait Length 74 Feet Mod 1 Marl VIII Navy Design LCM-8 Hull Numbers 8500 and 8580 thru 8618 Manual

Figure 4-4. Inboard view of port propulsion unit.

TM 55-1905-217-12

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

RAMP CONTINUES TO LOWER WITH CONTROL VALVE IN NEUTRAL

Step 1. Cheek counterbalance valve.

Adjust counterbalance valve. See paragraph 4-94 or 4-96.

UNUSUALLY SLOW OPERATION

Step 1. Check pump or motor.

Replace defective component (para 4-93).

Step 2. Check for restriction in line.

Clear lines (para 4-93).

Step 3. Check relief valve setting to see if it is set too low (para 4-93).

Adjust relief valve See paragraph 4-93.

NOISY OPERATION OF PUMP

Step 1. Check for air in system.

Purge air from system (para 4-86).

EXCESSIVE HEAT BUILDUP IN SYSTEM

Step 1. Check to see if relief valve is leaking at high pressure.

Adjust relief valve. See paragraph 4-93.

LOSS OF OIL

Step 1. Check for ruptured line

Replace line.

Step 2. Check ramp locking system two-way valve for external or internal leakage (hull numbers 8540

thru 8566 and 8580 thru 8618).

Tighten connections and replace defective parts (para 4-97).

SECTION VII. RADIO INTERFERENCE SUPPRESSION

4-15. General Methods Used to Attain Proper

4-18. Testing of Radio Interference Suppression

Suppression

Components

Essentially, suppression is attained by providing a low

Test the capacitors for leaks and shorts on a capacitor

resistance path to ground for the stray currents. The

tester; replace defective capacitors. If test equipment is

methods used include shielding wires, grounding the

not available and interference is indicated, isolate the

frame with bonding straps, and using capacitors and

cause of interference by the trial-and-error method of

resistors.

replacing each capacitor in turn until the cause of

interference is located and eliminated.

4-16. Radio Interference Suppression Components

a. Primary Suppression Components. The primary

suppression components are those whose primary

function is 'to suppress radio interference. These

components are identified in figure 4-3.

b. Secondary Suppression Components. These

components have radio interference suppression

functions which are incidental or secondary to their

primary function.

4-17. Replacement of Suppression Components

Refer to figure 4-3 and replace the radio interference

suppression components.

Figure 4-3. Interference suppression components.

SECTION VIII. ENGINES

two six-cylinder diesel engines in a side-by-side

4-19. General (fig. 4-4 and fig. 4-5)

arrangement coupled to a transfer gear and mounted on

a. Description. Model 12005A (starboard) and

a steel base.

12006A (,port) twin units each consist of

4-13