Solenoids
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| 图 1 | g01158469 |
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动力换档压力电磁阀（比例式） | |
泵压力电磁阀是机器 ECM 的输出设备。 该电磁阀是一个三端口减压阀。 该电磁阀是比例式。 ECM 使用脉冲宽度调制信号（PWM）来改变发送至电磁阀的电流。 电磁阀移动的距离与电流成正比。 阀的位置接通或阻塞流到泵的机油流量。 电磁阀失能时，机油流量被堵。 机油流量被堵导致泵减少冲程。
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| 图 2 | g01158530 |
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行驶速度变换电磁阀 回转制动器电磁阀 液压锁电磁阀 | |
行驶速度变换电磁阀是机器 ECM 的输出设备。 行驶速度变换电磁阀设置机器的行驶速度。 行驶速度取决于主泵的输送压力。 如果主泵的输送压力很高，行驶速度变换电磁阀将失能。 如果主泵的输送压力很低，行驶速度变换电磁阀将通电。
回转制动器电磁阀是机器 ECM 的输出设备。 回转制动器电磁阀通电可释放回转制动器。 除行驶操纵杆/踏板外，将任何其它操纵杆移动到 空档位置约 6.5 秒后，回转制动器电磁阀即失能。
液压锁电磁阀是机器 ECM 的输出设备。 液压锁电磁阀通电可启用主液压压力。 液压锁电磁阀断电可停用主液压压力。
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| 图 3 | g01158576 |
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限流电磁阀 (1) 电磁线圈 (2) 示意图符号 | |
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| 图 4 | g01158641 |
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1P-2P 交换 1 电磁阀 | |
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| 图 5 | g01158723 |
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1P-2P 交换 2 电磁阀、起重电磁阀 | |
Caterpillar Information System:
324D, 325D, 326D and 329D Excavators and 329D MHPU Mobile Hydraulic Power Unit Machine Systems Manual Valve (Auxiliary Shutoff) - Install
320D, 321D, 323D, 324D, 325D, 326D, 328D, 329D, 330D, 336D, 336D2, 340D and 340D2 Excavators, 324D Forest Machine and 323D MHPU, 324D MHPU, 325D MHPU, 329D MHPU, 330D MHPU and 336D MHPU Mobile Hydraulic Power Units Machine Electronic Control System Sensors
416E Backhoe Loader Extendable Stick Pads - Inspect/Adjust - If Equipped
374D and 390D Excavators Machine Electronic Control System Pedal Control
C15 and C18 Engines for Caterpillar Built Machines Alternator Mounting
345C MHPU Mobile Hydraulic Power Unit Machine Systems Pilot Valve (Travel) - Disassemble
330D, 336D, 336D2, 340D and 340D2 Excavators and 336D MHPU Mobile Hydraulic Power Unit C9 Engine Supplement Refrigerant Receiver-Dryer - Remove and Install
330D, 336D, 336D2, 340D and 340D2 Excavators and 336D MHPU Mobile Hydraulic Power Unit C9 Engine Supplement Refrigerant Condenser - Remove and Install
320D, 321D, 323D, 324D, 325D, 326D, 328D, 329D, 330D, 336D, 336D2, 340D and 340D2 Excavators, 324D Forest Machine and 323D MHPU, 324D MHPU, 325D MHPU, 329D MHPU, 330D MHPU and 336D MHPU Mobile Hydraulic Power Units Machine Electronic Control System Switches
330D, 336D, 336D2, 340D and 340D2 Excavators and 336D MHPU Mobile Hydraulic Power Unit C9 Engine Supplement Muffler - Remove and Install
330D, 336D, 336D2, 340D and 340D2 Excavators and 336D MHPU Mobile Hydraulic Power Unit C9 Engine Supplement Fuel Filter and Base - Remove and Install - Secondary
330D, 336D, 336D2, 340D and 340D2 Excavators and 336D MHPU Mobile Hydraulic Power Unit C9 Engine Supplement Ether Start Valve - Remove and Install
320D and 323D Excavators Hydraulic System Engine Performance - Test - Engine Speed
320D, 321D, 323D, 324D, 325D, 326D, 328D, 329D, 330D, 336D, 336D2, 340D and 340D2 Excavators, 324D Forest Machine and 323D MHPU, 324D MHPU, 325D MHPU, 329D MHPU, 330D MHPU and 336D MHPU Mobile Hydraulic Power Units Machine Electronic Control System Related Components
345C MHPU Mobile Hydraulic Power Unit Machine Systems Pilot Valve (Travel) - Assemble
324D, 325D, 326D and 329D Excavators and 329D MHPU Mobile Hydraulic Power Unit Machine Systems Accumulator - Remove and Install
345C Excavator and 345C MHPU Mobile Hydraulic Power Unit Machine Systems Manual Ball Valve (Counterweight Circuit) - Remove
320D, 321D, 323D, 324D, 325D, 326D, 328D, 329D, 330D, 336D, 336D2, 340D and 340D2 Excavators, 324D Forest Machine and 323D MHPU, 324D MHPU, 325D MHPU, 329D MHPU, 330D MHPU and 336D MHPU Mobile Hydraulic Power Units Machine Electronic Control System General Information
320D, 321D, 323D, 324D, 325D, 326D, 328D, 329D, 330D, 336D, 336D2, 340D and 340D2 Excavators, 324D Forest Machine and 323D MHPU, 324D MHPU, 325D MHPU, 329D MHPU, 330D MHPU and 336D MHPU Mobile Hydraulic Power Units Machine Electronic Control System Service Tools
320D, 321D, 323D, 324D, 325D, 326D, 328D, 329D, 330D, 336D, 336D2, 340D and 340D2 Excavators, 324D Forest Machine and 323D MHPU, 324D MHPU, 325D MHPU, 329D MHPU, 330D MHPU and 336D MHPU Mobile Hydraulic Power Units Machine Electronic Control System Electrical Component and Connector Locations
320D, 321D, 323D, 324D, 325D, 326D, 328D, 329D, 330D, 336D, 336D2, 340D and 340D2 Excavators, 324D Forest Machine and 323D MHPU, 324D MHPU, 325D MHPU, 329D MHPU, 330D MHPU and 336D MHPU Mobile Hydraulic Power Units Machine Electronic Control System Diagnostic Capabilities
325D and 329D Excavators and 325D Material Handler Machine System Specifications Relief Valve (Pilot) - Front Lines
324D, 325D, 326D and 329D Excavators and 329D MHPU Mobile Hydraulic Power Unit Machine Systems Pressure Reducing Valve (Implement and Swing Priority) - Remove
854K Wheel Dozer and 992K Wheel Loader Power Train Using the Operator Monitor to Determine Diagnostic Codes