Hitachi Ex1900-5 Excavator Technical Operational Principle Manual (TTLA-0595-EX)
File Details:
Hitachi Ex1900-5 Excavator Technical Operational Principle Manual (TTLA-0595-EX)
- Manual Language:English
- Pages: 201
- Size: 37.5 MB
- Downloadable:Yes
- Format:PDF
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Hitachi Ex1900-5 Excavator Technical Operational Principle Manual (TTLA-0595-EX)
1. The signals from the auto-idle switch and pilot pressure sensors (front/swing, and travel) are sent to MC(B).
2. When signals from the pilot pressure sensors are reduced to 0.3 MPa (3 kgf/cm2, 43 psi) or less with the auto-idle switch ON, MC(B) delivers a signal to the ECM.
3. Approx. 4 seconds after the ECM receives the signal from the MC(B), the ECM drives the governor so that the engine speed is reduced to the auto-idle speed [1400 ± 50 min-1].
4. The engine speed sensor 2 checks the engine speed and sends a signal to the ECM. Therefore, the ECM can recognize that the engine speed is reduced to the auto-idle speed.
5. When a control lever is operated and the pilot pressure sensor signal increases to 0.49 MPa (5 kgf/cm2, 71 psi) or more, MC(B) stops sending the signal to the ECM. Then. the ECM increases the engine speed to the speed range set by the fuel lever.
Table of Contents:
Hitachi Ex1900-5 Excavator Technical Operational Principle Manual (TTLA-0595-EX)
MATERIALS TOP......................................................................... 0 OPERATIONAL PRINCIPLE................................................................. 1 SECTION 1 GENERAL..................................................................... 2 Group 1 Specifications............................................................ 4 Specifications................................................................ 4 Working Range................................................................. 5 Engine........................................................................ 7 Engine Accessories............................................................ 9 Hydraulic Devices............................................................. 10 Electrical Equipment.......................................................... 13 Filter........................................................................ 15 Others........................................................................ 15 Group 2 Component Layout.......................................................... 16 Main Components............................................................... 16 Electrical Components (Overall Layout)........................................ 17 Electrical Components (Engine and Components)................................. 18 Electrical Components (Engine)................................................ 19 Electrical Components (Electrical Equipment Box).............................. 21 Reray Latout.................................................................. 22 Electrical Component Layout in the Cab........................................ 23 Electrical Components (Battery Compartment)................................... 25 Electrical Components (ECM Equipment Box)..................................... 27 Pump and Components........................................................... 28 Control Valve................................................................. 29 Pilot Panel (Control Valve Behind Side)....................................... 31 Pilot Panel (Rear Side)....................................................... 33 Undercarriage................................................................. 34 Swing Device.................................................................. 35 Travel Device................................................................. 36 Auto-Lubrication System....................................................... 37 SECTION 2 SYSTEM...................................................................... 40 Group 1 Control System............................................................ 42 Outline....................................................................... 42 Engine Control................................................................ 44 Pump Control.................................................................. 57 Oil Cooler Fan Motor Speed Control............................................ 63 Wiper Control................................................................. 65 Electrical/Hydraulic Combined Circuit Control................................. 67 Auto-Lubrication Control...................................................... 71 Group 2 Hydraulic System.......................................................... 76 Outline....................................................................... 76 Pilot Circuit................................................................. 77 Main Circuit.................................................................. 85 Oil Cooler Fan Motor Circuit.................................................. 96 Air Conditioner Compressor Motor Circuit...................................... 96 Pump Transmission Oil Cooler Circuit.......................................... 96 Travel Shock Damper and Travel Stop Circuit................................... 97 Group 3 Electrical System.........................................................100 Outline.......................................................................100 Power Source Circuit..........................................................101 Accessory Circuit.............................................................113 Engine Start Circuit..........................................................115 Charging Circuit..............................................................119 Surge Voltage Prevention Circuit..............................................121 Engine Stop Circuit...........................................................123 Engine Stop Circuit by Emergency Engine Stop Switch and Engine Stop Switch....125 SECTION 3 COMPONENT OPERATION.........................................................130 Group 1 Pump Device...............................................................132 Outline.......................................................................132 Main Pump.....................................................................133 Regulator.....................................................................135 4-Unit Pump...................................................................161 Group 2 Swing Device..............................................................162 Outline.......................................................................162 Swing Motor...................................................................163 Swing Parking Brake...........................................................165 Swing Reduction Gear..........................................................166 Valve Unit....................................................................167 Group 3 Control Valve.............................................................188 Outline.......................................................................188 Pilot Port Location...........................................................171 Hydraulic Circuit.............................................................172 Main Relief Valve And Overload Relief Valve...................................174 Make Up Valve.................................................................175 Group 4 Pilot Valve...............................................................176 Outline.......................................................................176 Construction..................................................................177 Function......................................................................178 Operation.....................................................................179 Group 5 Travel Device.............................................................182 Outline.......................................................................182 Travel Motor..................................................................183 Travel Mode Control...........................................................185 Brake Valve...................................................................187 Parking Brake.................................................................188 Travel Reduction Gear.........................................................189 Group 6 Others (Upperstructure)...................................................190 Pilot Shut-Off Valve..........................................................190 Air Conditioner...............................................................191 Auto-lubrication System.......................................................193 Oil Cooler Fan Motor..........................................................194 Accumulator...................................................................195 Group 7 Others (Undercarriage)....................................................196 Swing Bearing.................................................................196 Adjuster Cylinder.............................................................197 Accumulator...................................................................198 Center Joint..................................................................199
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