TM 5-3895-383-24
Piston Motor (Drum Propel)
SMCS Code: 4351; 5058
Part No.: 123-5259
Illustration 50
Drum Drive Motor
(1) Drive shaft. (2) Motor case. (3) Retainer. (4) Pistons. (5) Spring. (6) Barrel. (7) Minimum displacement adjustment screw. (8)
Head. (9) Valve spool. (10) Flushing valve. (11) Swivel pin. (12) Control piston. (13) Maximum displacement adjustment screw. (14)
Control lens. (15) Control slot. (16) Control slot. (17) Pivot pin.
The drum drive motor is a variable displacement axial piston
motor with a bent axis. The drum drive motor in LOW speed
has the following characteristics:
High torque
Large displacement
The drum drive motor in HIGH speed has the following
characteristics:
Low torque
Small displacement
In
LOW
speed,
the
motor
has
a
displacement
of
55 cc/rev (3.35 cu in/rev). In HIGH speed, the motor has a
displacement of 28 cc/rev (1.71 cu in/rev). When the machine
is shifted from LOW to HIGH, the displacement and the torque
of the drum drive motor are decreased by one half. At the
same time, the rotating speed is doubled. The drum drive
motor can operate in either direction.
Four lines are connected to the motor:
Two high pressure loop lines
One displacement selector pilot line
One case drain line
10-45
