BOSS AS 2343746 - Caterpillar

Standard 80 cc (4.9 in3) Steering Motor
Illustration 1 g00560969
(1) Shaft (2) Nut (3) Retaining Ring (4) Bearing (5) Bearing (6) Retaining plate (7) Center Pin (8) Barrel (9) Port plate (Flushing valve) (10) Case (11) Plug (12) Head (13) Case drain port (14) Bevelled springs (15) Piston (16) Shims (A) Port A (not shown) (B) Port BThe steering motor is a bidirectional fixed displacement piston motor. The steering motor is located at the rear of the machine on top of the differential case.The steering motor is operated by pressure oil from the steering pump. A change in the direction of oil flow through the motor does not change the amount of output torque from the shaft of the steering motor. Oil flow through the steering motor can be in either direction. A change to the direction of the oil flow changes the direction of the following components:
Barrel (8)
Pistons (15)
Shaft (1) The following components rotate:
Shaft (1)
Nut (2)
Retaining plate (6)
Pistons (15)
Barrel (8) The following components do not rotate:
Head (12)
Case (10)
Port plate (9)
Shims (16)
Ring (3) Oil from the steering pump flows through port (A) or port (B) into the inlet slot on head (12). Then, the oil flows into the inlet slot in port plate (9). Note: Head (12) contains an inlet slot and an outlet slot. The slot that will supply oil to the inlet slot in port plate (9) is dictated by the direction of the turn. Port plate (9) contains an inlet slot and an outlet slot. Also, the direction of the turn determines if these slots in port plate (9) are used as an inlet or an outlet.Oil that flows through port plate (9) flows into the cylinders of barrel (8) that are over the inlet control slot.The cylindrical heads of pistons (15) are held in the sockets of shaft (1). The head ends of the pistons are held by retaining plate (6). The closed end of pistons (15) are positioned in barrel (8). Head (12) is at a fixed angle of 28 degrees to the axis of shaft (1) .The bent axis between pistons (15) and barrel (8) cause seven pistons (15) to move in and out of the cylinders. This forces the rotation of pistons (15) , shaft (1), and barrel (8) .As shaft (1), pistons (15), and barrel (8) rotate, the pistons reach the top dead center. At the same time, the cylinder begins to overlap the inlet slot in head (12) which is open to output pressure from the steering pump. Then, the pistons begin to move downward.When the pistons reach the bottom dead center, the outlet slot is open. Piston (15) pushes oil out of the cylinder into the outlet slot in port plate (9). Then, the oil goes through port (A) or port (B) to the inlet side of the steering pump.Oil flow into port (A) and oil flow out of port (B) causes shaft (1) to rotate in a counterclockwise direction when you view the steering motor from the drive end.