TM 5-3895-373-34
1.16
SCREED VIBRATION MOTORS.
There
are
two
different
screed
vibration
motors,
described as follows:
a.
Main screed vibration motor. The main
screed
vibration
motor
is
a
gear-type,
fixed
displacement, bi-directional hydraulic motor. It is
located on the main screed and provides power to both
the left and right main screed vibrators. The motor has a
displacement of 0.45 cubic inches (7,37 ml) per
revolution and operates at 2000 psi (13 790 kPa). It is
powered by the left auxiliary hydraulic pump and the
auxiliary vibration pump. Hydraulic oil flows through a
gerotor to power the drive shaft. The motor is equipped
with a check valve to regulate case pressure. A two-bolt
motor mount connects the hydraulic motor to the right
vibrator on the main screed. The left vibrator is driven by
the right vibrator through a drive shaft.
b.
Extension screed vibration motors. The
extension screed vibration motors are gear-type, fixed
displacement, bi-directional hydraulic motors. The left
extension screed vibration motor is located on the left
extension screed. The right extension screed vibration
motor is located on the right extension screed. Hydraulic
oil flowing out of the main screed vibration motor is
directed to the extension screed vibration motors. A
50/50, spool-type flow divider splits hydraulic oil between
the two extension screed vibration motors. A two-bolt
motor mount connects each motor to the offset vibrators.
Each motor has a displacement of 0.218 cubic inches
(3,57 ml) per revolution and operates at 2000 psi (13
790 kPa). A gerotor powers the drive shaft on each
motor. Each motor is equipped with a check valve to
regulate case pressure.
1-8