Complete workshop repair & service manual with electrical wiring diagrams for Hyundai Construction Wheel Loader HL770, HL770-7, HL770-7A, HL770-9, HL770-9A, HL770-9S. It's the same service manual used by dealers that guaranteed to be fully functional and intact without any missing page.

This Hyundai Construction Wheel Loader HL770 service & repair manual (including maintenance, overhaul, disassembling & assembling, adjustment, tune-up, operation, inspecting, diagnostic & troubleshooting…) is divided into different sections. Each section covers a specific component or system with detailed illustrations. A table of contents is placed at the beginning of each section. Pages are easily found by category, and each page is expandable for great detail. The printer-ready PDF documents work like a charm on all kinds of devices.

EXCERPT:
CONTENTS
SECTION 1 GENERAL
Group 1 Safety Hints - - - - - 1-1
Group 2 Specifications - - - - - 1-10
Group 3 Operational Checkout Record Sheet - - - - - - 1-23
SECTION 2 ENGINE
Group 1 Structure and Function - - - - - 2-1
Group 2 Engine speed and Stall rpm - - - - - 2-11
Group 3 Fuel Warmer System - - - - - 2-12
SECTION 3 POWER TRAIN SYSTEM
Group 1 Structure and Function - - - - - 3-1
Group 2 Operational Checks and Troubleshooting - - - - 3-68
Group 3 Test and Adjustments - - - - 3-79
Group 4 Disassembly and Assembly - - - - - 3-81
SECTION 4 BRAKE SYSTEM
Group 1 Structure and Function - - - - - 4-1
Group 2 Operational Checks and Troubleshooting - - - - 4-32
Group 3 Tests and Adjustments - - - - - 4-39
Group 4 Disassembly and assembly - - - - - - 4-41
SECTION 5 STEERING SYSTEM
Group 1 Structure and Function - - - - - 5-1
Group 2 Operational Checks and Troubleshooting - - - - 5-16
Group 3 Tests and Adjustments - - - - - 5-24
Group 4 Disassembly and Assembly - - - - - 5-32
SECTION 6 WORK EQUIPMENT
Group 1 Structure and Function - - - - - 6-1
Group 2 Operational Checks and Troubleshooting - - - - 6-42
Group 3 Tests and Adjustments - - - - - 6-53
Group 4 Disassembly and Assembly - - - - - 6-68
SECTION 7 ELECTRICAL SYSTEM
Group 1 Component Location - - - - - - 7-1
Group 2 Electrical Circuit - - - - - 7-3
Group 3 Monitoring System - - - - - - 7-21
Group 4 Electrical Component Specification - - - - - - 7-61
Group 5 Connectors - - - - 7-68
Group 6 Troubleshooting - - - - - - 7-89
…
1. HYDRAULIC SYSTEM OUTLINE
The loader hydraulic system is a pilot operated, closed center system which is supplied with flow from the variable displacement piston main hydraulic pump.
The loader system components are :
·Main pump
·Main control valve
·Bucket cylinder
·Boom cylinders
·Remote control valve (Pilot control valve)
·Safety valve
Flow from the main hydraulic pump not used by the steering system leaves the flow amplifier EF port.
It flows to the inlet port plate of two section or three section block type main control valve.
The main control valve is load pressure independent flow distribution system which routes flow to the boom, bucket or auxiliary cylinders (not shown) when the respective spools are shifted.
Flow from the main pump is routed to the main control valve where pump outlet pressure is reduced to pilot circuit pressure. The main control valve flow to the remote control valve.
The remote control valve routed flow to either end of each spool valve section in the main control valve to control spool stroke.
A accumulator mounted on safety valve supplies a secondary pressure source to operated remote control valve so the boom can be lowered if the engine is off.
The return circuit for the main hydraulic system have return filter inside the hydraulic tank. The return filter uses a filter element and a bypass valve. The bypass valve is located in the upside of filter.
SECTION 6 WORK EQUIPMENT
GROUP 1 STRUCTURE AND FUNCTION
…