Caterpillar 966H and 972H Wheel Loader Hydraulic System Schematic

Electrical faults are much easier to trace with the right diagram in front of you. This is the wiring diagram / electrical schematic document for the Caterpillar 966H and 972H Wheel Loader Hydraulic System Schematic.

Document reference: RENR8828-03.

What the diagrams cover

• HMU steering circuit and Command Control Steering (attachment)
• Main hydraulic schematic - implement, tilt, lift cylinder circuits (model-specific tilt cylinder part numbers for 966 vs. 972, standard/high lift/logger configurations)
• Brake system - foot brake, parking brake, service brake accumulators (966/972 and CE variants)
• Quick coupler circuit, flow divider valve
• Fan and brake pump, machine component locations
• Full component and pressure tap location tables

Models covered

• 966H
• 972H Wheel Loader

User help

1. Make sure it matches your machine. Look up your model and serial number and compare them with the coverage above. Not sure? Send us those details and we will help you check before you buy.
2. Get the file. This is a digital PDF download. Nothing is shipped, so you can start using it as soon as you have the file.
3. Read it on any device. The file opens in standard PDF readers on Windows, Mac, Android and iOS. Keep a backup copy so you always have it.
4. Jump straight to the section you need. Start from the table of contents or search for a part name, fault code or value, then print just those pages for the workshop.
5. Trace circuits methodically. Identify the circuit, connector or harness in the diagram, then check voltage, continuity and grounds at the points shown before replacing components.
6. Stay safe. Repairs on engines, hydraulics, fuel and electrical systems can be dangerous. Follow the safety instructions in the document, use proper tools and support equipment, and follow local regulations.

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