HEADLINER 9V5756 - Caterpillar

Illustration 1 g02892817
(1) Drum speed sensor
(2) Case drain supply line
(3) Brake supply line
(4) Reverse port B
(5) Maximum displacement limiter
(6) Forward port A
(7) Shift port
(8) Flushing spool
(9) Flushing relief valve
(10) Drum motor Drum motor (10) is located on the left side of the drum. This motor is a piston motor with two speeds. The drum motor drives the drum through a planetary gear reducer. The planetary gear reducer contains an integral parking brake.The parking brake is spring applied and hydraulically released. Brake inlet line (3) on the motor provides charge oil to release the parking brake.The drum motor receives supply oil from and returns low-pressure oil to the drum propel pump, through forward port "A" (6) and reverse port "B" (4).The drum motor contains a flushing valve. Flushing valve spool (8) directs oil from the low-pressure side of the drum propel loop to flushing relief valve (9). When the pressure in the low-pressure side of the propel loop is greater than the setting of the valve, the flushing relief valve opens. When the flushing relief valve is open, an orifice diverts oil from the low-pressure side of the drum propel loop into the drum motor case drain.Case drain line (2) for drum motor (10) directs oil from the drum motor case to the return manifold.Drum motor (10) is equipped with maximum displacement limiter (5) and a minimum displacement limiter (not visible) . When the shift solenoid is not energized, the drum motor operates at maximum displacement. When the shift solenoid is energized, charge oil is directed into shift port (7). In this case, the motor operates at maximum displacement. Drum motor (10) is equipped with speed sensor (1). The machine ECM uses input from this sensor and input from the axle speed sensor in order to calculate the actual machine speed. The machine ECM uses this input in the control logic for uncommanded movement.Note: Sensor input is used for propel system calibration. The propel system is controlled using open loop logic. The machine does not use input from drum speed sensor (1) in order to control the speed of the machine. Note: The speed sensor screw threads are not blind tapped. These threads tap into the case cavity. The speed sensor retaining screws require the use of Loctite (242 Blue) sealant thread lock in order to prevent motor case oil from weeping past the threads. The CS54B, CP54B and CS64B are the only large soil compactors that require sealant.
Illustration 2 g02892836
Motor Cross Section
(5) Maximum displacement limiter
(8) Flushing spool
(9) Flushing relief valve
(11) Output shaft
(12) Swashplate
(13) Piston
(14) Barrel assembly
(15) Servo piston
(16) Shuttle valve
(17) Slipper pad18. Slipper retainer
(19) Minimum displacement limiter
(20) Valve plate Propel motor (10) is an axial piston motor. The speed of this type of motor shifts when the angle of swashplate (12) is changed. The motor can be operated against either minimum displacement limiter (19) or maximum displacement limiter (5). The motor operates at maximum displacement in the working