TM-5-3895-372-20
CONCRETE-MOBILE MIXER BODY M919, MODEL 8CM-24/F
TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE MANUAL
AUGUST 1980
TM-5-3895-372-20 - Page 20 of 694
TM 5-3895-372-20
Section III WATER SYSTEM
2-6.
INTRODUCTION.
The mixer body carries enough water to mix a full load of concrete and clean up afterwards.
Pressure should be
maintained at 60 psi (414 kPa).
The wet admix systems (paras 2-8 and 2-9) are separate from the main system.
2-7.
DESCRIPTION.
1.
FILLER CAPS.
Used when potable water is available.
2.
INLET WATER STRAINER.
Filters out leaves, stones, and other large particles as water enters tank.
Used
when water supply is impure.
3.
WATER TANK.
Holds 400 gal (1514 liters).
Carries water for concrete mixing and cleanup.
Coated inside
with water-repellent paint to prevent leaks and rust.
4.
SIGHT GAGE.
Allows operator to check tank water level.
5.
GAGE VALVE.
Used to shut off water supply to gage if gage is broken or being removed.
6.
WATER RETURN LINE.
Allows water to return from pump through relief valve to tank.
7.
PRESSURE RELIEF VALVE.
Adjustable valve controls water pressure by regulating flow in return line.
Normal pressure is 60 psi (414 kPa).
8.
AIR FITTING.
Used to blow water out of system to prevent freeze-up.
9.
VENT.
Used in draining system in cold weather.
10.
HOSE VALVE.
Controls water flow to washout hose.
11.
WATER CONTROL.
Controls water flow into mixer trough.
Pointer attached to valve handle indicates
water flow.
12.
SPRAY NOZZLES (3).
Spray water into cement and aggregate mixture as it enters mixer trough.
Outside
nozzles spray at an angle for better mixing action.
Admixture solutions are injected into center nozzle.
13.
QUICK-OPENING VALVE.
Mechanical link to main clutch control automatically opens valve when main
clutch is engaged.
Allows water from flow control valve to enter spray
14.
DRAINCOCKS (8).
Located at low points of system.
Allow water drainage to prevent freeze-up.
Must be
opened before compressed air is blown into system.
15.
AIR FITTING.
Used to blow water out of system to prevent freeze-up.
16.
WATER PUMP.
Supplies pressure to water system.
Belt-driven from main drive.
17.
SCREEN STRAINER.
Filters water flowing into pump.
18.
SHUTOFF VALVE.
Controls water flow from tank to pump.
19.
WATER SUPPLY LINE.
Carries water from tank through shutoff valve to pump.
20.
DRAIN VALVE.
Opens to allow drainage of water from tank.
2-6
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