Part of the Hyundai Repair Manuals.
Need factory answers for your Hyundai HL757-9, HL757XTD-9, or HL757TM-9 wheel loader? This 545-page service manual PDF covers all three variants front to back: engine, power train, brakes, steering, work equipment, and the complete electrical system. You get full wiring circuits with connector pinouts and component locations, hydraulic schematics with fluid routing, error code tables, and troubleshooting charts for every major system. Page after page of disassembly and assembly procedures walk you through each rebuild the way Hyundai engineers wrote them. Torque the EHPS steering valve mounting bolts to 2.5 kgf·m (18.1 lbf·ft) and check the brake gear pump against its 150 kgf/cm2 maximum delivery pressure. No more chasing electrical gremlins with a multimeter and a prayer. Bookmarked by system and keyword-searchable, the PDF opens on any device you carry into the shop.
What's Inside This Hyundai HL757-9, HL757XTD-9, HL757TM-9 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 1-38 | Safety Hints, Specifications, Operational Checkout Record Sheet |
| Engine | 39-47 | Structure and Function, Fuel Warmer System, Engine Speed and Stall RPM |
| Power Train System | 48-260 | Power Train Component Overview, Torque Converter, Transmission Layout and Installation, Operation of Transmission, Electro-Hydraulic Shift Control, Gear Selector, Electronic Control Unit, Transmission Disassembly and Assembly |
| Brake System | 261-307 | Brake Hydraulic Circuit, Service Brake Released and Operated, Parking Brake Released and Operated, Brake Pump, Principle of Operation, Brake Tests and Adjustments |
| Steering System | 308-367 | Steering Hydraulic Circuit, Steering Unit, EHPS Steering Valve, Neutral, Left Turn and Right Turn Operation, Steering Tests and Adjustments |
| Work Equipment | 368-459 | Hydraulic System Outline, Work Equipment Hydraulic Circuit, Main Pump Structure and Function, RCV Lever Positions (Raise, Lower, Float, Dump, Roll), Cylinder Drift and Cycle Time Tests |
| Electrical System | 460-545 | Component Location, Electrical Circuit, Monitoring System, Electrical Component Specification, Connectors, Troubleshooting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Steering valve (EHPS) mounting bolt torque | 2.5 ± 0.5 kgf·m (18.1 ± 3.6 lbf·ft) | p. 33 |
| Brake valve mounting bolt torque | 2.5 ± 0.5 kgf·m (18.1 ± 3.6 lbf·ft) | p. 33 |
| Maximum delivery pressure | 150 kgf/cm2 | p. 270 |
| Diameter | 138 mm | p. 278 |
| Mounting height | 187 mm | p. 278 |
| Body bore cut-in depth | 0.15 mm (0.006") | p. 301 |
| Maximum pressure at steering valve (EHPS) | 4.5 MPa (45 bar, 640 psi) | p. 334 |
| Steering valve (EHPS) oil pressure | 24.5 ± 0.05 MPa (250 ± 5 bar, 3560 ± 71 psi) | p. 336 |
| Tightening torque for six screws with washers | 3.1 ± 0.6 kgf·m (22.4 ± 4.3 lbf·ft) | p. 354 |
| Tightening torque for Gland | 56 ± 6 kgf·m (405 ± 43.4 lbf·ft) | p. 356 |
| Tightening torque for Piston | 90 ± 9 kgf·m (650 ± 65.1 lbf·ft) | p. 356 |
| Bypass valve set pressure | 1.36 kg/cm2 (19.3 psi) | p. 408 |
Hyundai HL757-9, HL757XTD-9, HL757TM-9 Common Problems This Manual Covers
Hyundai HL757-9 hydraulic oil overheats during steering, wheel feels hard and slow under load
Test steering valve oil pressure and compare against the 24.5 MPa (250 bar) spec on page 336. If pressure runs low or oil heats fast, pull the priority valve spool and confirm the orifice plugs are installed in both spool ends; a missing plug restricts flow and cooks the oil.
Manual Section: Steering System Troubleshooting p. 336Boom drifts down and bucket rolls forward while the machine sits parked overnight
Warm the hydraulic oil, curl the bucket, and time the drift with the loader parked on level ground. Persistent drift means leaking cylinder seals or a leaking control valve section. Reseal the cylinders and torque the gland to 56 ± 6 kgf·m (405 ± 43.4 lbf·ft) per the chart on page 356.
Manual Section: Work Equipment Troubleshooting p. 356Loader lift and tilt functions slow and spongy, hydraulic pump whines under load
Check the hydraulic oil level on the tank sight gauge; capacity is 155 L (40.9 U.S. gal). Replace the return filter, due every 250 operating hours per page 436, since a plugged element opens the bypass at 1.36 kg/cm2 (19.3 psi) and starves filtration. Bleed air from the suction line if the pump still whines.
Manual Section: Work Equipment Troubleshooting p. 436Brake pedal feels weak and inconsistent, warning light flickers after several hard stops
Test the brake accumulator precharge; priming pressure spec is 50 kgf/cm2 on page 278. An accumulator that has lost nitrogen gives only one or two assisted stops after engine shutdown. Check service brake pump output too; that gear pump is rated for 150 kgf/cm2 maximum delivery on page 270. Replace the accumulator if it won't hold precharge.
Manual Section: Brake System Troubleshooting p. 278Transmission slips on grades and machine crawls forward slowly after cold start
Check the transmission oil level warm at idle; total capacity is 28 L on page 35. Low oil lets the torque converter run partially empty and cavitate. Drain and refill with clean oil, replace the transmission filter, and retest. If slippage continues, run the pressure checks in the power train troubleshooting procedures.
Manual Section: Power Train System Troubleshooting p. 106Frequently Asked Questions
What are the torque specifications for the wheel mounting nuts on the Hyundai HL757-9?
The torque specification for the tire mounting nuts on the Hyundai HL757-9 is 79 ± 2.5 kgf·m (571 ± 18.1 lbf·ft). p. 32
How often should the hydraulic oil filter be replaced on the Hyundai HL757-9?
The hydraulic oil filter in the filter case of the hydraulic oil tank should be replaced every 250 operating hours or more often. p. 436
What is the engine oil capacity for the Hyundai HL757-9?
The engine oil capacity for the Cummins QSB6.7 engine in the Hyundai HL757-9 is 18 liters (4.8 U.S. gallons). p. 29
What is the correct procedure for bleeding the hydraulic brake system?
To bleed the brake system, two people are required. One person operates the brake valve while the other opens and closes the bleed screws. Detailed steps are provided on page 432. p. 432
What is the maximum delivery pressure for the brake pump?
The gear pump used for the brake system has a maximum delivery pressure of 150 kgf/cm². p. 307
Is this Hyundai HL757-9 Service Manual a digital download?
You get a 545-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Is this Hyundai HL757-9 manual print-friendly?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Reviews
There are no reviews yet.