Hitachi Ex1200-5 Hydraulic Excavator Technical operational Principle Manual (TTLA-432-EX)
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Hitachi Ex1200-5 Hydraulic Excavator Technical operational Principle Manual (TTLA-432-EX)
- Manual Language:English
- Pages:228
- Size: 29.1 MB
- Downloadable:Yes
- Format:PDF
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Hitachi Ex1200-5 Hydraulic Excavator Technical operational Principle Manual (TTLA-432-EX)
1. Normally, the spring pushes the spool, blocking the valve ports.
2. When the front attachment and travel control levers are operated at the same time, the right travel pilot oil pressure shifts the flow combiner valve control spool in the signal control valve so that the pilot pressure shifts the flow combiner valve spool.
3. When the flow combiner valve spool is shifted, pressure oil from main pump 2 is routed to the left travel spool.
4. Therefore, pressure oil from main pump 2 is routed to the left travel spool in parallel with the right travel spool and pressure oil from main pump 1 is routed to the front attachment. Consequently, the machine can travel straight when a combine operation of travel and front attachment is performe
Table Of Contents:
Hitachi Ex1200-5 Hydraulic Excavator Technical operational Principle Manual (TTLA-432-EX)
MATERIALS TOP......................................... 0 Operational Principle................................. 1 Section And Group Contents............................ 2 Section 1 General..................................... 3 Group 1 Specifications............................ 5 Specifications................................ 5 Working Range (Backhoe)....................... 7 Working Range (BE Backhoe).................... 8 Working Range (Loading Shovel)................ 9 Engine........................................ 10 Engine Accessories............................ 13 Hydraulic Devices............................. 13 Electrical Equipment.......................... 16 Group 2 Component Layout.......................... 19 Main Components............................... 19 Electrical System Components (1).............. 20 Electrical System Components (2).............. 21 Electrical System Components (3).............. 23 Electrical System Components (4) ............. 24 On and Around Pumps........................... 25 Others........................................ 26 Section 2 System...................................... 27 Group 1 Control System............................ 29 Outline....................................... 29 Engine Control................................ 30 Pump Control.................................. 44 Valve Control................................. 48 Oil Cooler Fan Motor Control.................. 56 Auto-Lubrication Control...................... 58 Group 2 Hydraulic System.......................... 61 Outline....................................... 61 Pilot Circuit................................. 62 Main Circuit.................................. 78 Pump Transmission Oil Cooling Circuit......... 98 Group 3 Electrical System......................... 99 Outline....................................... 99 Power Source Circuit..........................100 Bulb Check Circuit............................101 Engine Start Circuit..........................104 Charging Circuit..............................110 Accessory Circuit.............................114 Surge Voltage Prevention Circuit..............116 Section 3 Component Operation.........................119 Group 1 Pump Device...............................121 Outline.......................................121 Main Pump, Oil Cooler Fan Motor Drive Pump....122 Regulators....................................125 3-Unit Pump...................................146 Group 2 Swing Device..............................147 Outline.......................................147 Swing Motor ..................................148 Valve Unit....................................150 Swing Parking Brake...........................152 Swing Reduction Gear..........................153 Group 3 Control Valve ............................155 Outline.......................................155 Hydraulic Circuit.............................164 Flow Combiner Valve...........................166 Main Relief Valve.............................168 Overload Relief Valve.........................169 Make-Up Valve.................................169 Holding Valve.................................170 Arm Regenerative Valve........................172 Boom Overload Relief Pressure Switch Valve....174 Group 4 Pilot Valve...............................177 Outline.......................................177 Operation.....................................178 Group 5 Travel Device.............................185 Outline.......................................185 Travel Reduction Gear.........................186 Travel Motor..................................187 Travel Brake Valve............................189 Travel Motor Displacement Angle Change........194 Parking Brake.................................196 Group 6 Signal Control Valve......................199 Outline.......................................199 Pilot Port....................................200 Shuttle Valve.................................204 Shockless Valve...............................208 Pump 1 and 2 Flow Rate Control Valve..........212 Arm Flow Rate Control Valve, .................214 Group 7 Others (Upperstructure)...................215 Pilot Shut-Off Valve..........................215 Shockless Valve...............................216 Solenoid Valve................................220 Oil Cooler Fan Motor..........................222 Accumulator...................................223 Auto-Lubrication System.......................224 Group 8 Others (Undercarriage)....................225 Swing Bearing.................................225 Center Joint..................................226 Track Adjuster................................227
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