DISC-BRAKE 2925387 - Caterpillar

Illustration 1 g03640139
Typical of 914M, 918M
(1) Hydrostatic pump
(2) Hydrostatic motor (de-clutching)
(3) Hydrostatic motor (constant drive)
(4) Transmission
(5) Hydraulic oil filter
(6) Clutch
(8) Charge pump
Illustration 2 g03589722
Typical of 910M
(1) Hydrostatic pump
(2) Hydrostatic motor (de-clutching)
(3) Hydrostatic motor (constant drive)
(4) Transmission
(5) Hydraulic oil filter
(6) Clutch
(8) Charge pumpThe hydrostatic system contains the following components:
hydrostatic pump (1)
hydrostatic motors (2) and (3)
transmission (4)
hydraulic oil filter (5)
clutch (6)
charge pump (8)
hydrostatic drive pressure sensor (9)The hydrostatic pump (1) supplies oil to hydrostatic motors (2) and (3). The hydrostatic motors (2) and (3) are mounted to the transmission (4). The front drive shaft and rear drive shaft connect the transmission to the axles.Charge pump (8) provides control oil to transmission (4). Charge pump (8) provides oil to the hydrostatic system and pilot oil to the implement system through hydraulic oil filter (5).
Illustration 3 g03589825
(1) Hydrostatic piston pump
(2) Hydrostatic piston motor (de-clutching motor)
(3) Hydrostatic piston motor (constant drive motor)
(4) Transmission
(5) Hydraulic oil filter
(6) Clutch
(8) Charge pump
(9) Hydrostatic drive pressure sensor
(10) Charge pressure relief valve
(11) Cross over relief makeup check vale
(12) Cross over relief makeup check vale
(13) Hydrostatic drive interlock solenoid valve
(14) Proportional pump control valves (forward)
(15) Proportional pump control valves (reverse)
(16) Pump actuator
(17) Motor control solenoid valve
(18) Transmission clutch solenoid
(19) Transmission clutch valve
(20) Motor flushing valve
(21) Hydraulic oil cooler
(22) Hydraulic oil cooler bypassHydrostatic System Neutral
When the machine is started and in the NEUTRAL position, hydrostatic pump (1) has no displacement until a direction of travel is selected.Cross Over Relief (COR)/makeup check (11) and (12) protect the hydrostatic system by limiting the pressure spikes in the drive loop. The check valves in the crossover relief COR/makeup valves (11) and (12) open and supply oil to the drive loop. The check valves in the COR/makeup valves (11) and (12) also supply oil to the flushing valve. The COR/makeup valves (11) and (12) supply make oil that is flushed by the flushing valves. The COR/makeup valves (11) and (12) make any oil lost through internal leakage. Charge relief valve (10) limits the charge pressure.Charge pump (8) sends oil through hydraulic oil filter (5) and then to various components of the hydrostatic drive system. Oil flows from hydraulic oil filter (5) to the interlock valve manifold. Oil in the hydrostatic pump control valve manifold flows to the charge relief valve and to the cross over relief/makeup valves. Within the interlock manifold is the hydrostatic interlock solenoid valve (13). The hydrostatic interlock solenoid valve (13), when energized, allows oil to hydrostatic pump control valves (14) and (15). The hydrostatic interlock solenoid valve (13) is powered on when the machine is running and the parking brake is disengaged. The charge oil pressure is set by charge pressure relief valve (10) in the pump. Charge oil is supplied to hydrostatic pump control valves (14) and (15). Hydrostatic pump control valves (14) and (15) controls the flow of oil to the actuator cylinder (16) of hydrostatic drive pump (1). Charge oil is also supplied to hydrostatic motors (2) and (3) for bearing lube.Hydrostatic System Forward Drive
The three position Forward, Neutral, and