Contents

Basic principles of electronically assisted systems

• Starting assistance
• Electric acceleration
• Automatic return to idle
• Engine overheating safety device
• Swing break release
• Swing break
• Automatic travel sequences for two-speed excavators

Electrical schematics

• Specifications
• Schematic symbols
• Description of electrical cabinet printed circuit (standard equipment)
• Electrical cabinet printed circuit wiring (standard)
• Description of electrical cabinet printed circuit (optional)
• Electrical cabinet printed circuit wiring (optional)
• Printed circuit schematic guide
• P10 instrument panel electrical schematic
• Instrument panel wiring
• Instrument panel (front face)
• Right-hand control arm, left-hand control arm (standard equipment)
• Right-hand control arm, left-hand control arm wiring (optional)
• Cab floor wiring (standard)
• Engine module and upperstructure wiring (standard equipment)
• Electronic system wiring
• Cab floor wiring (optional)
• Engine module and upperstructure wiring (optional)
• Cab and cab option wiring
• Index

Basic principles of the hydraulic circuit

• 1288 Simplified hydraulic circuit
• 1488 Simplified hydraulic circuit
• Location of hydraulic components on the machine
• 1288 General single-speed excavator hydraulic circuit
• 1288 General two-speed excavator hydraulic circuit
• 1488 General excavator hydraulic circuit
• Hydraulic options

1288 /1488 General hydraulics

• General hydraulics specifications
• 1288 technical specifications
• 1488 technical specifications

12/1488 Hydraulic pumps

• Technical specifications of the various pumps
• Identification of orifices and adjustment points
• Engine / pump coupling
• Pilot pump
• Main technical details of gear pumps
• Main technical details of piston pumps
• Load-sensing information circuit anti-pumping valve
• Proportional valve

Load-sensing, torque regulator, flow cancelling and independence Of movements systems

• System description
• Working principles

12/1488 Pilot system

• Pilot circuits
• Electrovalve blocks
• P35 Pressure limiter
• Emergency foot pump / manifold
• Control levers
• Travel control block
• Control pedals

12/1488 Attachement options

• Load-holding valve function
• Safety valve function
• Option control valve blocks

12/1488 Attachment function

• Attachment function hydraulic diagram
• Attachment/travel control valve block
• Relief valve
• Control valve element
• Safety valves, control valve spool Compensator and pressure selector
• Decompression selector block
• Receiving component feed circuit
• Attachment cylinders
• Boom and dipper flow limiters

12/1488 Swing function

• Swing function hydraulic diagram
• Swing control valve block
• Relief valve
• Control valve element
• Selector/flow limiter
• Pressure selector block
• Safety / anti-cavitation block
• Hydraulic swing motor
• Automatic swing brake

12/1488 Travel function

• Single-speed travel function hydraulic diagram
• Travel control valve
• Flow limiter valve (speed limiter)
• Single-speed hydraulic travel motors
• Automatic travel brake
• Travel brake release selector block
• Swivel joint
• Travel safety blocks
• Two-speed travel function hydraulic diagram
• Two-speed hydraulic travel motors

Pressure settings for 1288C and 1488C