![Hyundai HL720-3 Repair Manual [Wheel Loader]](https://youfixthis.com/wp-content/uploads/2016/02/2016-02-18_15-27-05-300x300.jpg)
Part of the Hyundai Repair Manuals.
All 441 pages of this Hyundai HL730-3 Service Manual PDF focus on one machine: the HL730-3 Wheel Loader, from torque converter to bucket cylinder. You get complete electrical wiring circuits, hydraulic schematics for the brake, steering, and work equipment systems, and troubleshooting charts backed by tests and adjustments for every major system. Exploded views walk you through disassembly and assembly of the transmission, axles, brake valve, and main control valve, step by step. Torque the main pump housing mounting bolts to 19.6 ± 2.9 kgf·m, then confirm priority valve relief pressure at 21 MPa. No more chasing hydraulic faults with a gauge and a hunch. The PDF is bookmarked by section; pull it up on your phone at the machine, search any spec by keyword, and get back to work.
What's Inside This Hyundai HL730-3 Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety and General Information | 1 | Replace Safety Signs, Live with Safety, Keep ROPS Installed Properly |
| Specifications | 2-16 | Without Tooth and Cutting Edge Type Bucket, Bolt-On Cutting Edge Type Bucket, With Tooth Type Bucket |
| Engine | 17-20 | Structure, Lube Oil Circuit Schematic, Fuel System Schematic, Cooling System Schematic |
| Power Train System | 21-169 | Power Train Component Overview, Hydraulic Circuit, Torque Converter, Transmission, Axle, Tire and Wheel, Operational Checks and Troubleshooting, Troubleshooting |
| Brake System | 170-208 | Outline, Full Power Hydraulic Brake System, Hydraulic Circuit, Brake Pump, Brake Valve, Brake Accumulator, Pressure Switches, Operational Checks and Troubleshooting |
| Steering System | 209-273 | Outline, Hydraulic Circuit, Priority Valve, Steering Unit, Overload Valve, Steering Cylinder, Operational Checks and Troubleshooting, Troubleshooting |
| Work Equipment | 274-360 | Hydraulic System Outline, Hydraulic Circuit, Work Equipment Hydraulic Circuit, Main Pump Operation, Remote Control Valve, Main Control Valve, Pilot Oil Supply Unit |
| Electrical System | 361-441 | Component Location, Electrical Circuit, Illumination Circuit, Head Light Circuit, Work Light Switch, Starting Circuit, Fuel Shut Off Circuit, Charging Circuit |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Steering unit mounting bolt torque | 2.5 ± 0.5 kgf·m | p. 10 |
| Priority valve mounting bolt torque | 2.5 ± 0.5 kgf·m | p. 10 |
| Main pump housing mounting bolt torque | 19.6 ± 2.9 kgf·m | p. 10 |
| Priority valve relief pressure | 21 MPa | p. 212 |
| Overload valve shock valves pressure | 270-290 bar | p. 220 |
| Hydraulic tank capacity | 60 L (15.9 U.S. gal) | p. 230 |
| Tighten torque for LS plug | 5.1 ± 1 kgf·m (36.9 ± 7.2 lbf·ft) | p. 240 |
| Torque wrench range | 0~7.1 kgf·m (0~51.6 lbf·ft) | p. 243 |
| Tightening torque for Nut (Pipe assy) | 30 ± 3 kgf·m (217 ± 21.7 lbf·ft) | p. 266 |
| Pressure relief valve setting | 3MPa | p. 303 |
| Body bore cut-in depth | 0.15mm | p. 343 |
| Engine Oil Quantity | 12.6 L | p. 7 |
Hyundai HL730-3 Common Problems This Manual Covers
Hyundai HL730-3 pilot control pressure low or unstable, bucket and boom respond slow and jerky
Check pilot pressure with hydraulic oil warmed to 45~55°C, per page 317. The pilot pressure relief valve setting is 3 MPa, shown on page 303. If pressure stays low, verify tank oil level against the 60 L (15.9 U.S. gal) capacity, then inspect the main pump and torque its housing mounting bolts to 19.6 ± 2.9 kgf·m.
Manual Section: Work Equipment p. 303Steering wheel hard to turn or wanders, response erratic at low engine speed
Test steering effort with oil warmed to 45~55°C before condemning parts. If response stays erratic, remove the steering unit and inspect the spool and sleeve for wear, replacing all seals. Tighten the hexagon socket screws to 6.6 ± 0.5 kgf·m (47.7 ± 3.6 lbf·ft) per page 263, then torque the mounting bolts to 2.5 ± 0.5 kgf·m.
Manual Section: Steering System p. 209Priority valve sticking, steering and loader hydraulics fight each other for flow
Remove the priority valve, disassemble it, and clean the spool and bore in clean solvent. Replace the seals if the spool is scored. Verify relief pressure reaches 21 MPa, the setting listed on page 212. On reassembly, torque the LS and PP plugs to 5.1 ± 1 kgf·m (36.9 ± 7.2 lbf·ft) per page 240 and the mounting bolts to 2.5 ± 0.5 kgf·m.
Manual Section: Steering System p. 212Hydraulic pump whines and oil foams in the tank, all functions slow when hot
Check the hydraulic tank level first; capacity is 60 L (15.9 U.S. gal), listed on page 230. Inspect the suction piping for air leaks and crushed hoses, then tighten the pipe assembly nuts to 30 ± 3 kgf·m (217 ± 21.7 lbf·ft) per page 266. Drain and refill with clean oil if foaming continues after the leaks are fixed.
Manual Section: Work Equipment p. 230Transmission slips under load or machine will not move in any gear when warm
Check transmission oil level with the engine at low idle, 800 rpm, and top up before any pressure testing. Run the clutch pressure and stall checks in the Power Train troubleshooting procedures starting. Low pressure across all clutches points to the charging pump; low pressure in one clutch only means worn seals in that pack.
Manual Section: Power Train SystemFrequently Asked Questions
What are the torque specifications for the wheel loader piping?
The torque specifications for pipe and hose fittings are provided in the manual. For a 1/4" thread size, the torque is 3 kgf·m (21.7 lbf·ft), for 3/8" it is 4 kgf·m (28.9 lbf·ft), for 1/2" it is 5 kgf·m (36.2 lbf·ft), for 3/4" it is 12 kgf·m (86.8 lbf·ft), and for 1" it is 14 kgf·m (101 lbf·ft). p. 12
What error codes appear on the Hyundai HL730-3 wheel loader and how can they be fixed?
Error codes are two-digit hexadecimal numbers. For example, code '11 hex' indicates a logical error at the gear range signal, and '21 hex' indicates a short circuit to battery voltage at the clutch cutoff input. Detailed troubleshooting for these codes is found on pages 3-17 through 3-19 of the manual. p. 37
How do I perform the hydraulic oil clean up procedure using a portable filter caddy?
To perform the clean up, connect the filter caddy suction line to the drain port at the bottom of the hydraulic tank and the discharge line to the filler hole. Circulate the oil for approximately 10 minutes, ensuring it passes through the filter at least four times. The hydraulic tank capacity is 60 liters (15.9 U.S. gal). p. 230
What is the tightening torque for the ROPS Cab mounting bolts?
The tightening torque for the ROPS Cab mounting bolts (4EA) is 28 ± 2.6 kgf·m (203 ± 18.8 lbf·ft). p. 10
What is the procedure for checking the boom cylinder leakage?
Raise the boom until the cutting edge is about 1m (3ft) above ground, stop the engine, and measure the drift from the tooth or cutting edge to the ground for 1 minute. Wait 10 minutes and measure again. If the drift rate is approximately the same, the check is OK. If the drift is considerably less on the second measurement, repair the cylinder. p. 315
How quickly can I access this Hyundai HL730-3 manual after buying?
A 441-page Service Manual in searchable PDF format, available the moment you complete checkout. View on computer, tablet, or phone, with no shipping wait.
Are there any print restrictions on this Hyundai HL730-3 manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
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