TM 10-3835-223-13&P
1 - 9 . HOSE REEL SYSTEM OF OPERATION - cont .
(4)
Power Unit. The power unit is comprised of an electric drive motor, hydraulic pump, and
reservoir. When energized, the electric motor rotates the hydraulic pump. The pump draws fluid from
reservoir and supplies it, under pressure, to the hydraulic motor and cylinder through the valve station.
Pressure relief valves within the valve station return excess fluid flow to the reservoir.
b. Frame Unit. The frame unit contains the hose reels, brakes and hose reel drive components. The
reels are rotated by the drive wheel. When reel selection is changed from left to right, or right to left, the
hydraulic cylinder moves the drive wheel and motor assembly to the selected reel.
(1)
Drive Wheel and Motor. Hydraulic pressure supplied by the power pack is converted to a
rotational force by the reversible hydraulic motor. The motor is directly coupled to the drive wheel. The drive
wheel transfers the rotational force of the motor to the hose reel.
Drive wheel rotation is reversed at the
control cable.
(2)
Cylinder. The hydraulic cylinder changes selection of the hose reels by pivoting the drive
wheel and motor from one reel to the other. The cylinder is extended or retracted by pressure from the power
pack. Force from the cylinder holds the drive wheel against the hose reel.
(3)
Brake Levers. The brake levers and linkage force the brake pad in contact with the hose
reels. Friction between the hose reel and pad surface prevents rotation of the reel.
1-8
