line leading to the pump to prevent conden-
3-12. Drive Sheave
sate freezeup. The alcohol dispenser is equip-
Keep the drive sheave (4, fig. 3-7) free from
ped with an eight-ounce capacity metal bowl
dirt, grease and foreign matter at all times to
and a needle valve which controls the flow of
prevent belt slippage and damage to belts or
alcohol.
drive sheave.
b. Service (fig. 2-8).
(1) Shut down the unit (para 2-12).
(2) Remove plug handle and fill with
alcohol. Reinstall handle.
(3) Start engine (para 2-11).
(4) During operation, inspect sight gauge
frequently and refill when necessary.
(5) Open needle valve to increase and
close to decrease flow of alcohol.
3-10. Air Compressor
a. Oil Level. To check the oil level in the
compressor, remove oil filler plug (fig. 3-4).
Oil level should be even with the bottom
threads of the filler plughole.
equipped with a filter element (4) to filter
out all dirt. The element must be cleaned or re-
placed to insure clean air and to prevent wear
due to dirt. Remove wing nut (1) and cover
(2) to gain access to the filter element. Re-
placement of the element is preferred.
c. Air Receiver. Clean the air receiver with
an approved solvent. Clean the tank with a
wire brush. Inspect all parts for dents, bends,
and other damage. Report all damage. Drain
the air receiver of moisture by opening the
air tank drain valve (44, fig. 2-3).
d. Compressor Drive Belt Adjustment. Ad-
just as follows:
(1) Loosen the engine attaching hard-
ware.
(2) Move the engine toward or away from
the compressor and check for proper belt
tension at the midway point between the pul-
leys. When belt can be depressed to inch,
tension is proper.
(3) Tighten the engine attaching hard-
ware and replace the belt guard.
3-11. Engine
Refer to TM 5-2805-203-14 for servicing the
engine.
