Section III. PREVENTIVE MAINTENANCE

TM 55-4920-405-13&P

b. Extreme Heat.

3-6. GENERAL. To keep the test stand ready for

operation, you must attend to preventive maintenance.

(1) Set up the test stand in a well ventilated

Correct any defects you find during inspections.

area. Keep all access doors open during

Section V of this chapter supplies the information

operation.

you need to replace authorized parts. Other normal

(2) Lubricate in accordance with lubricants in

preventive maintenance you must perform consists of

table 3-5.

cleaning, lubrication, and special maintenance for

(3) Keep the engine air shrouding, cylinder

extreme environmental conditions.

head, fins, and air openings in the housing

free of dirt and other obstructions.

3-7. CLEANING. Clean the test stand using the in-

(4) When the test stand is shut down, keep the

structions in paragraph 3-lc.

fuel tank full to prevent condensation.

c. Dusty or Sandy Areas.

3-8. LUBRICATION. Lubricate the test stand as

follows :

(1) Use the lubricants listed in the proper

column of table 3-5 to lubricate the test

a. Using cleaning solvent (item 1, table 1-7),

stand. Be careful to keep dust and sand

clean all surfaces around the point that you are

away from lubricants, the grease gun, and

going to lubricate.

lubricant containers.

b. Lubricate each of the points listed in table 3-5.

(2) Protect the test stand from dust and sand

Using the lubricant listed for that point.

as much as possible. Keep the test stand

c . Operate the test stand for five minutes after

clean.

engine lubrication. Inspect the oil filter for

(3) Cover the test stand with a tarpaulin when

leaks. Then, shut down the test stand. Wiat

it is not in use.

five minutes and recheck the oil filter for

(4) If you can, water down the area around the

leaks. Check the oil level in the engine crank-

operating site to keep down dust and sand.

case, using the oil dip stick. Add specified

(5) Clean the engine oil cleaner after every

oil as needed to bring the oil level to the full

two to four hours of operation.

mark on the dip stick.

d. Rainy or Humid Conditions.

NOTE

(1) Use the lubricants listed in table 3-5 to

lubricate the test stand.

Take proper care of lubricants. When not

(2) When the test stand is shut down, keep the

being used, keep containers tightly cover-

fuel tank full to prevent condensation.

ed. Store containers in a dry, clean area.

(3) Keep all electrical parts clean and dry.

Keep dirt and other foreign matter out of

Watch for fungus growth; remove fungus at

lubricants.

once.

(4) Cover the test stand with a tarpaulin or

EXTREME ENVIRONMENTAL MAINTENANCE.

3-9.

keep it under shelter when it is not in use.

e. Salt Water Areas.

a. Extreme Cold. For extreme environmental

maintenance, proceed as follows:

(1) Use the lubricants listed in table 3-5 to

lubricate the test stand.

(1) Lubricate in accordance with lubricants

(2) Wipe all exposed areas of the test stand

in table 3-5.

often. Clean off salt deposits with clean

(2) Always keep the battery electrolyte at the

water, and wipe dry.

correct level. Keep the battery fully

(3) Coat all exposed machined metal surfaces

charged.

with a thin film of oil.

--------

(4) Retouch or repaint damaged painted

CAUTI.ON.

----

surf aces.

Whenever you add water to the battery under

(5) Cover the test stand with a tarpaulin or

extreme cold conditions, keep the engine

keep it under shelter when it is not in use.

running. This will charge the battery and

f. High Altitude Areas. If you must use the test

circulate the water you added. If you do

stand at high altitudes, use the following special

not observe this caution, the added water

maintenance procedures:

may freeze and crack the battery case.

(1) At high altitudes, less oxygen is available

(3) Close engine access doors as needed to

to the carburetor. The fuel mixture must

keep the engine at its normal operating

be adjusted. Refer to intermediate main-

temperature.

tenance for adjustment.

(4) Make sure that the oil in the air cleaner is

(2) Keep the air cleaner clean in order to let

the correct type (table 3-5).

as much air as possible get through to the

(5) When the test stand is shut down, keep the

carburetor.

fuel tank full to prevent condensation.

3-13