gallon compartment with evenly distributed integral baffles. The compartment has pressure and vacuum
vents and a manhole with locking device. The tank compartment is connected by piping to the vehicle's fuel
receipt and delivery system. In the curbside cabinet, there is a filter/separator, two 12-volt batteries, pump
and engine compartment, engine fuel tank, landing gear control, and emergency shutoff valve. The
roadside cabinet houses the landing gear ground board, recirculation fitting, portable grounding rod, toolbox,
manifold assembly, control and instrument panel, hose reel cabinet. In the hose reel cabinet, you have a 1
1/2-inch hose reel and hose, a 2 1/2-inch hose and reel and hose, and a 300-GPM meter assembly (3-inch,
high pressure control panel).
Figure 3-4. M970 5,000 gallon semitrailer
M978 HEMTT Tanker. The M978 HEMTT tanker (Figure 3-5) is used for refueling wheeled and track
vehicles and aircraft which, on today's modern battlefield, are more mobile than ever before. The M978
comes equipped with two hose reels, each containing 50 feet of 1 1/2" hose, with service nozzle of 2 1/2" in
diameter, and a pressure differential gage, which indicates a dirty or clean filter/separator. There are 15
elements and 15 canisters. The vehicle can operate in temperatures from 25 to 120 degrees Farenheit, ford
water up to 48 inches deep; for 5 minutes without damage, or maintenance before operation can continue.
Maintains a speed of 25 MPH, on a 3 percent grade, with a full trailer (100,000 lbs) and 40 MPH on a 3
percent grade vehicle only (60,000 lbs). Maintain a speed of up to 55 MPH while operating at full load
without a trailer on a good, level road. It can start and climb a 30 percent grade fully loaded with a trailer or
start and climb a 60 percent grade fully loaded without a trailer. The normal operating range for this eight-
wheel drive vehicle is 300 miles, based on 159 gallons of fuel. The M978 can be utilized for self-loading
(filtered or nonfiltered), recirculation, bulk delivery, filtered dispensing (using over wing/CCR nozzle), and
defueling. The 300 GPM pump assembly operates by PTO and HACV. The M978 is also supplied with a 25
GPM auxiliary pump that is powered by a 24 volt battery. The M978 can also be used for aircraft refueling
operations by utilizing the HEMTT Tanker Aircraft Refueling System (HTARS). The HTARS kit, it's
components, use, and operation are discussed in the following lesson.
3-6
QM 5098
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