Hitachi Ex1200-5 Hydraulic Excavator Technical operational Principle Manual (TTLA-432-EX) – PDF Download

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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

HITACHI EX1200-5 HYDRAULIC EXCAVATOR TECHNICAL OPERATIONAL PRINCIPLE MANUAL (TTLA-432-EX) – PDF DOWNLOAD:

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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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