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Load, Haul, Dump Load Haul Dump R1700G SBR
Dashboard Parts Repair Service
Service Information
Applied Failure Analysis
Bench Test Procedures
Contamination Control Guidelines
Custom Service Information
Disassembly And Assembly
Engine News
General Service Information
Information Release Memo
Operation And Maintenance Manual
Reuse And Salvage Guidelines
Schematic
Service Letter - APD
Service Magazine
Shop Review
Special Instruction
Specifications
Systems Operation
24H General Service And Repair Safety Information
Air Conditioning And Heating R134A For All Caterpillar Machines
C11 And C13 Engines For Caterpillar Built Machines
Cat Work Area Vision System
Caterpillar Monitoring System
Emission Control System For Load Haul Dump Machines And Underground Articulated Trucks
Fluid Power And Electrical Graphic Symbols
Load Haul Dump Machine Machining & Welding Information
Load Haul Dump Machines Vital Information Management System (Vims)tm
Load Haul Dumps Machines , And Underground Articulated Trucksautomatic Lubrication System
Product Link - PL522/523
Product Link 121S/300
R1700G Load Haul Dump Braking System
Systems Operation
2006/06/20
General Information
Accumulator Charging Valve (Brake) (KENR6264-03)
General Information
SMCS General
- 4264 Information i02499726
Service and Parking Brake System
Service and Parking Brake System
Service and Parking Brake System
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Gear Pump (Steering, Pilot, and Braking)
Accumulator Charging Valve (Brake)
Accumulator Charging Valve (Brake)
Brake Accumulator
Brake Control Valve (Service)
Pressure Reducing Valve (Pilot Oil)
Brake Control Valve (Parking)
Service and Parking Brake
Illustration 1 g01252790
Limit Switch (Transmission Neutralizer)
The accumulator charging valve is located on the left side of the rear frame, in the transmission compartment.
Limit Switch (Stop Light)
Pressure Switch (Parking Brake Oil)
Pressure Switch (Brake Accumulator Oil)
Pressure Sensor (Brake Accumulator Oil)
Pressure Switch (Residual Brake Oil)
Pressure Sensor (Service Brake Oil)
Pressure Switch (Service Brake Oil)
Brake Release System
Brake Release System
Brake Release System
Sequence Valve (Brake Release)
Brake Release Cylinder
Testing and Adjusting
R1700G Load Haul Dump Hydraulic System
R1700G Load Haul Dump Machine Electrical System
R1700G Load Haul Dump Power Train
R1700G Load Haul Dump Remote Control System
R1700G Load Haul Dump Steering System
Technical Information Bulletin
Testing And Adjusting
Tool Operating
Illustration 2 Manual g00290902
Port locations for the accumulator charging valve
Torque Specifications
(1) Accumulator port for the rear brakes
(2) Inlet from the brake and pilot pump
(3) Plug
Troubleshooting
(4) Outlet to the hydraulic tank
(5) Accumulator port for the front brakes
Truck Enginerelief
(6) Pressure Newsvalve
(7) Port for the brake accumulator oil pressure switches
The brake and pilot section of the gear pump supplies hydraulic oil to the braking system. The oil first flows to the brake accumulator
charging valve. The accumulator charging valve maintains the pressure in the brake accumulators at a constant range while the engine
is running.
The inverse shuttle section of the accumulator charging valve senses the lower pressure of the two accumulator pressures. The oil then
flows from the inverse shuttle section of the accumulator charging valve to the brake accumulator oil pressure switches.
A spool in the accumulator charging valve then moves in order to allow the hydraulic oil to flow to one accumulator or to both
accumulators. In addition, the brake and pilot section of the gear pump supplies oil to the parking brake circuit, the implement pilot
circuit and the steering pilot circuit. Any excess oil which is not required for these systems is diverted back to the hydraulic tank.
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Illustration 3 g00879865
Schematic for the accumulator charging valve
(1) Accumulator port for the rear brakes
(2) Inlet from the brake and pilot pump
(4) Outlet to the hydraulic tank
(5) Accumulator port for the front brakes
(6) Pressure relief valve
(7) Port for the brake accumulator oil pressure switches
(8) Flow control valve
(9) Orifice for controlling the rate of oil charge to the brake accumulators
(10) Check valve
(11) Spool for cut-in and cut-out pressure
(12) Inverse shuttle valve
The accumulator charging valve contains the following internal components; a pressure relief valve, a flow control valve, a flow control
orifice, a spool for cut-in and cut-out pressure and an inverse shuttle valve.
The accumulator charging valve controls the flow of oil from the brake and pilot section of the gear pump to the brake accumulators.
Pressure relief valve (6) limits the oil pressure that flows from the brake and pilot section of the gear pump to the braking circuit.
Flow control valve (8) regulates the flow of oil to the braking circuit. Any excess oil that is not required by the pilot circuit or the braking
circuit is diverted back to the hydraulic tank.
Note: Flow control valve (8) contains shims that set the stand-by pressure of the brake and pilot pump. When the pump is at stand-by
pressure, the brake accumulators do not require charging.
Check valve (10) prevents oil from flowing through the accumulator charging valve, and back to the brake and pilot pump.
Spool (11) is for controlling the cut-in and the cut-out pressures for the accumulator charging valve. When the oil pressure in the braking
circuits reaches the cut-in pressure, spool (11) shifts. The movement of spool (11) causes the spool in control valve (8) to also shift. This
stops the flow of oil to inverse shuttle valve (12).
Oil flows through inverse shuttle valve (12) to the brake accumulators during oil charge. Pressure oil from inverse shuttle valve (12)
flows to the oil end of the two brake accumulators. However, the oil flow between the two brake accumulators is kept separate. Inverse
shuttle valve (12) is designed to charge each brake accumulator when the pressure reaches the cut-in pressure.
Port (7) from inverse shuttle valve (12) connects to the two brake accumulator oil pressure switches. One switch alerts the operator
when the brake oil pressure drops below the minimum operating pressure. The other switch engages the parking brake if the pressure
further decreases.
PSP-0003A9FA
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i02499726
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