TM 5-3805-281-24-1
Theory of Operation
Supply oil flows through the valve plate (C) to half of
The propel motor (R) is a variable-displacement,
the pistons (O) in the cylinder block (D). The oil forces
bent-axis, axial-piston type motor that includes the
the pistons to slide down the cylinder block bores
brake valve housing (A) and propel park brake. The
transferring the force (S) to the drive shaft (K) turning
counterbalance valve, crossover relief valves, park
the drive shaft. As the cylinder block and drive shaft
brake release shuttle valve, pressure reducing valve,
rotate, half of the pistons move out of their bores while
and the servo piston shuttle valve are integral
the remaining pistons in the other half of the cylinder
components of the brake valve housing.
block move back in their bores to discharge oil to
return. Supply oil flows to the bottom port for forward
The servo piston (Q) controls the angle of cylinder
travel and to the top port for reverse travel.
block (D), pistons (O) and center shaft (F) with respect
to the drive shaft (K). As the angle is changed the
motor displacement changes which changes propel
motor speed.
CED,TX08227,3098
1922APR982/2
9025
05
86
6-85