GUARD AS-REAR 1237645 - Caterpillar

Illustration 1 g02807836
Pump Hydraulic System
(1) Steering valve
(2) Swing drive
(3) Line to dozer blade/stabilizer
(4) Stick cylinder
(5) Bucket cylinder
(6) Boom cylinders
(7) Main control valve group
(8) Lines to swing pump
(9) Travel pilot valve
(10) Boom and bucket pilot valve
(11) Stick and swing pilot valve
(12) Blade pilot valve
(13) Line to medium pressure attachment
(14) Medium pressure attachment
(15) Pilot manifold with transmission shift
(16) Fan group
(17) Fan drive pump
(18) Swing pump
(19) Main hydraulic pump
(20) Engine
(21) Brake pilot steering pump
(22) Steering priority valve
(23) Service brake valve
(24) Transmission
(25) Travel motor
(26) Lines to service brakes External Components
Illustration 2 g02757956
M313D and M315D Pump Compartment
(17) Fan drive pump
(18) Swing pump
(19) Main hydraulic pump
(27) Swing charge pump
(28) Swing pump regulator
(29) Swing pump actuator
(30) Main pump control
(31) Oil filter (swing charge pump) The hydraulic pump group consists of the main hydraulic pump (19) and the swing pump (18). Main hydraulic pump (19) is connected to the engine flywheel through a flexible coupling. Swing pump (18) is connected to the end of main hydraulic pump (19).The main pump is a piston type pump that has a variable displacement. The pump has a swashplate that uses a power shift signal from the proportional reducing valve in order to regulate the hydraulic horsepower output from the pump. Swashplate sensor (30) is used to send a signal to the machine ECM.Swing pump (18) is bidirectional with a variable displacement and a swashplate. The swing pump is a part of the closed loop swing system. The swing pump is at zero displacement when the swing system is in NEUTRAL. The swing pump will upstroke in each direction, which depends on the direction of swing. The swing system proportional pilot limiting solenoid valve regulates the hydraulic horsepower output from the swing pump.Swing charge pump (27) is attached to the rear of swing pump (18). The charge pump keeps the swing system under pressure and the charge oil is used for cooling and lubrication. Fan drive pump (17) is splined to the swing charge pump.Internal Components
Illustration 3 g02757959
Pump Group (Components)
(18) Swing pump
(19) Main hydraulic pump
(27) Swing charge pump
(28) Swing pump control
(30) Main pump control
(32) Minimum angle piston
(33) Engine flywheel
(34) Flexible coupling
(35) Maximum angle piston Swing pump (18) is shown here in the NEUTRAL position. Main pump (19) is in the UPSTROKE position and the pump is maintaining a constant flow.Flexible coupling (34) connects main pump (19) to engine flywheel (33). Swing pump (18) is connected to the drive shaft of main pump (19) by the use of a spline coupling. Swing charge pump (27) is driven off the end of swing pump (18). The swashplate for main pump (19) is regulated by minimum angle piston (32) and maximum angle piston (35). Pump supply pressure is directed to the smaller maximum angle piston (35) at all times. To destroke the pump, the pump control group directs a reduced pump supply pressure to the larger minimum angle piston (32).Adjustable Margin Pressure
Illustration 4 g02722114
Schematic of the Adjustable Margin Pressure
(36) Hydraulic Modulation valve
(37) Margin Pressure Valve
(38) Main pump
(39) Engine
Illustration 5 g02797562
(36) Hydraulic modulation solenoid Margin pressure is adjustable on