Part of the Hyundai Repair Manuals.
Need factory answers for your Hyundai HL730TM-3 wheel loader? This 455-page Hyundai HL730TM-3 service manual PDF walks through every major system: torque converter, transmission with electro-hydraulic shift control, brake and steering circuits, work equipment hydraulics, and the full electrical system. Inside you get complete wiring diagrams with component location charts, hydraulic schematics for the steering and work equipment circuits, a full troubleshooting section, and page after page of disassembly and assembly procedures. Every circuit is drawn out, from the priority valve to the charging system. The main pump runs a maximum operating pressure of 215 kgf/cm²; torque the engine mounting bolts to 12.3 ± 2.5 kgf·m. No more chasing shift faults with a multimeter and a prayer. Bookmarked for quick jumps; search any spec by keyword and pull it up on your phone right at the machine.
What's Inside This Hyundai HL730TM-3 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 9-31 | Safety Hints, Follow Safe Procedure, Wear Protective Clothing, Warn Others of Service Work, Use Handholds and Steps, Prepare for Emergencies, Work in Clean Area |
| Engine | 32-35 | Structure and Function, Lube Oil Circuit Schematic, Fuel System Schematic, Cooling System Schematic |
| Power Train System | 36-184 | Structure and Function (Power Train Component Overview), Torque Converter, Transmission, Electro-Hydraulic Shift Control with Proportional Valve, Gear Selector |
| Brake System | 185-223 | Structure and Function (Outline), Brake Pump (Principle of Operation), Brake Valve (Operation) |
| Steering System | 224-288 | Structure and Function (Outline), Hydraulic Circuit, Priority Valve, Steering Unit, Overload Valve, Steering Cylinder |
| Work Equipment | 289-379 | Structure and Function (Hydraulic System Outline), Hydraulic Circuit, Work Equipment Hydraulic Circuit, Main Pump Operation, Remote Control Valve |
| Electrical System | 380-455 | Component Location (Location 1), Location 2, Electrical Circuit, Illumination Circuit, Head Light Circuit, Work Light Switch, Starting Circuit, Fuel Shut Off Circuit |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Engine mounting bolt, nut | 12.3 ± 2.5 kgf·m | p. 25 |
| Radiator mounting bolt, nut | 12.3 ± 2.5 kgf·m | p. 25 |
| Main pump maximum operating pressure | 215 kgf/cm² | p. 22 |
| Brake pump maximum operating pressure | 150 kgf/cm² | p. 23 |
| Overload relief valve pressure (Raise, roll back) | 240 kgf/cm² | p. 23 |
| Overload relief valve pressure (Dump) | 120 kgf/cm² | p. 23 |
| Main relief valve pressure | 215 kgf/cm² | p. 23 |
| Pressure reducing valve (pilot pressure) | 9 bar | p. 49 |
| Engine Oil Quantity | 14.0 L | p. 22 |
| Main Pump Capacity | 33+29 cc/rev | p. 22 |
| Transmission Oil Capacity | 20 L | p. 28 |
| Boom Cylinder Bore/Rod/Stroke | 105/65/710 mm | p. 23 |
Hyundai HL730TM-3 Common Problems This Manual Covers
Hyundai HL730TM-3 loses all hydraulic functions and steering at once, pump whines under load
Check hydraulic oil level first; a low tank or suction air leak starves both pumps at the same time. Then test main relief pressure at the pump outlet: it must hold 215 kgf/cm2 per the spec on page 23. If pressure falls short, follow the work equipment hydraulic troubleshooting starting on page 289 and inspect the pump for internal leakage.
Manual Section: Work Equipment p. 289Steering wheel feels heavy and response is slow, gets worse at low engine idle
Test the priority valve first; a stuck spool starves the steering unit of flow. Verify the system relief holds 215 kgf/cm2 before condemning the steering unit itself. If you pull the priority valve or steering unit, retorque the mounting bolts to 2.5 kgf-m per the torque chart on page 25, then bleed the circuit and retest at full lock.
Manual Section: Steering System p. 224Boom drifts down with a loaded bucket, lever centered and engine still running
Test the boom overload relief valves first; the raise-side relief should hold 240 kgf/cm2 per the spec on page 23. A weak relief or leaking piston seals will let the boom settle. Swap the suspect relief valve and time the drift again. If it persists, pull the boom cylinders and inspect the piston seals; bore is 105 mm.
Manual Section: Work Equipment p. 289Hydraulic oil foams in the tank and turns milky after an hour of work
Check oil level with the boom down; a low tank uncovers the suction line and pulls air. Inspect suction hose clamps and fittings for air leaks and tighten them. Milky oil means water: drain the tank and refill with clean oil of the correct grade. Aerated oil cavitates the 33+29 cc/rev main pump fast, so fix this before working the machine.
Manual Section: Work Equipment p. 289Transmission slips in every gear and machine barely crawls up a ramp when loaded
Check transmission oil level hot at idle; the system holds 20 L total, per page 28. Low oil or a clogged filter drops clutch pressure and lets the packs slip. Work through the power train troubleshooting procedures to test clutch pressures by range. If the transmission was recently out, confirm mounting bolts are torqued to 29 kgf-m.
Manual Section: Power Train System p. 28Frequently Asked Questions
What do Hyundai HL730TM-3 error codes mean?
The error codes consist of two hexadecimal numbers. The first number indicates the type of signal, and the second number indicates the signal and the type of error. For example, 1 hex represents digital input signals, 3 hex represents speed signals, and B hex represents clutch errors. A full list of these codes and their meanings can be found on pages 52 and 53. p. 52
What are the replacement specifications for the Hydraulic pump?
The main hydraulic pump is a fixed displacement gear type pump. It has a maximum delivery pressure of 215 bar (3118 psi) and a maximum pump flow of 65 liters/min (17.2 gpm) at 2300 rpm. p. 346
What is the tightening torque for the main pump housing mounting bolt?
The tightening torque for the main pump housing mounting bolt (size M14 x 2.0) is 19.6 ± 2.9 kgf·m (89.0 ± lbf·ft). p. 25
What is the procedure for bleeding the hydraulic brake system?
Two people are required to bleed the brake system. One person operates the brake valve while the other opens and closes the bleed screws. You must push and hold the brake pedal down until the bleeding procedure is complete so no air remains in the system. p. 216
What is the standard value for boom cylinder drift?
The standard value for the retraction of the boom cylinder rod during a 15-minute drift test is 30mm. p. 350
What exactly do I receive with this Hyundai HL730TM-3 Service Manual?
Delivery is instant: a 455-page searchable PDF is yours the second checkout clears. Laptop, tablet, or phone, all fine.
Can I print specific sections of this Hyundai HL730TM-3 Service Manual?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
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