MAINTENANCE OF THE HEMTT - OD1662 - LESSON l/TASK 1
conditions improve, the range selector lever can be returned to the
normal (D) driving position.
TM 9-2320-2790-10-1 provides full
The transmission includes an electrically controlled power take off
(PTO). The PTO provides power to a hydraulic pump, which powers the
vehicle's hydraulic system.
The hydraulic system operates the self-
recovery winch, the material handling crane, the heavy duty recovery
winch, and the pumping equipment, depending on how the vehicle is
(c) Transfer Case. The transfer case (3) (figure 16 on the previous
page), connects the drive train to the No. 1 and No. 2 axles when 8-
wheel drive is needed.
and low) and neutral.
Because the gears are not synchronized, the
vehicle must be stopped before the transfer case can be shifted
Engagement of the transfer case in low range will
automatically engage the drive train to the front axles.
(d) Tandem Axles and Suspension. The front and rear-tandem axles (4)
are of the single reduction, full floating axle shaft type. The front
tandem provides steering. The rear tandem is nonsteering. Both front
and rear tandems are equipped with wheel differentials and interaxle
The interaxle differentials have driver-controlled
lockouts for positive drive to all axles in low range.
tandem is equipped with permanently engaged controlled traction
differentials. The front and rear suspensions are of the tandem axle
type, with leaf springs and equalizer beams.
universal joints (5) transmit engine power to the axles.
(2) Engine Systems. In the following subparagraphs, we will discuss
the subsystems that comprise the engine system.
(a) Air Intake System (figure 17 on the following page).
intake system consists of a dry type air cleaner (1), turbocharger
flow through the turbocharger,