CYLINDER & SEAL GP-BOOM 3624126 - Caterpillar

Illustration 1 g00704799
(1) Pressure taps on the screens for front and rear brake cooling (2) Speed sensor for the piston motor (3) Piston motor that drives the gear pumps for brake coolingPiston motor (3) that drives the brake cooling pump sections is a fixed displacement bent axis motor. The piston motor is located on the front of the hydraulic tank on the right side of the machine.Piston motor (3) drives three brake cooling pump sections that are located inside the hydraulic tank. The oil from the brake cooling pump sections combines with oil from the gear pump for the hoist and for the brake cooling. The combined oil is used to cool the disc brakes.The speed of the piston motor is determined by the amount of pressure oil that is sent by a variable displacement piston pump. Refer to Systems Operation, "Piston Pump (Brake Cooling Motor Drive)" for additional information about the piston pump.If the pump is fully on, the following maximum speeds can be expected.
Table 1
Motor Speed (1)    
Engine Speed     Maximum Speed Of The Piston Motor    
1250 rpm or less     system capacity    
1300 rpm     system capacity    
1450 rpm     1760 rpm    
1500 rpm     1728 rpm    
1600 rpm     1665 rpm    
1700 rpm     1601 rpm    
1750 rpm     1570 rpm    
1800 rpm     1538 rpm    
1841 rpm     1512 rpm    
1900 rpm     1475 rpm    
1910 rpm     1469 rpm    
1950 rpm     1443 rpm    
( 1 ) This table is only valid when the piston motor is fully on. This happens when the brake oil temperature is VERY HOT and when the high speed braking status is active.Speed sensor (2) for piston motor (3) sends the motor speed to the Brake/Cooling ECM. The Brake/Cooling ECM uses this input to maintain the motor speed. Pressure taps (1) provide access to the pressure of the oil at the screens for front and rear brake cooling.
Illustration 2 g00731814
(4) Case drain filterOil that leaks into the pump housing provides lubrication for the rotating components. This oil leakage is referred to as case drain oil. Case drain oil flows through the case drain port and case drain filter (4) into the steering hydraulic tank.
Illustration 3 g00987210
Sectional view of the piston motor (2) Speed sensor for the piston motor (3) Piston motor that drives the brake cooling pumps (5) Pin (6) Piston (7) Shaft (8) Port plate (9) Head (10) Rotating barrel (11) Retaining plate (12) Timing gear (13) HousingThe components of the motor that turn are the shaft (7), timing gear (12), pistons (6), retaining plate (11), and rotating barrel (10). The parts that do not turn are the pin (5), port plate (8), the housing (13), and head (9). The center point of the head of pin (5) is a point on the center line for shaft (7). The center point of the head of pin (5) is a point on the center line