Part of the Hyundai Repair Manuals.
This 397-page Hyundai HL740-9, HL740XTD-9, HL740TM-9 Service Manual PDF is aimed at one job: keeping your HL740 series wheel loader digging. You get factory wiring diagrams with connector pinouts, full hydraulic schematics, error code listings, and troubleshooting charts that walk from symptom to fix across the power train, brake, steering, and work equipment systems. Inside: complete disassembly and assembly procedures plus test and adjustment steps for every major system on the loader. Torque the rubber engine mounting nuts to 29.7 kgf·m (215 lbf·ft) and confirm the twin 12V, 80Ah batteries are feeding the 24V starting motor before you chase electrical gremlins. No more hunting wiring faults with a multimeter and a prayer. Bookmarked by system and searchable by keyword; jump straight to the spec and get back on the pile.
What's Inside This Hyundai HL740-9, HL740XTD-9, HL740TM-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 | 48-121 | Structure and Function, Operational Checks and Troubleshooting, Test and Adjustments, Disassembly and Assembly |
| Brake System | 122-161 | Structure and Function, Operational Checks and Troubleshooting, Tests and Adjustments, Disassembly and Assembly |
| Steering System | 162-221 | Structure and Function, Operational Checks and Troubleshooting, Tests and Adjustments, Disassembly and Assembly |
| Work Equipment | 222-310 | Structure and Function, Operational Checks and Troubleshooting, Tests and Adjustments, Disassembly and Assembly |
| Electrical System | 311-397 | Component Location, Electrical Circuit, Monitoring System, Electrical Component Specification, Connectors, Troubleshooting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Engine mounting bolt, nut (rubber, 2EA) | 29.7 ± 4.5 kgf·m (215 ± 32.5 lbf·ft) | p. 32 |
| Engine mounting bolt (bracket, 8EA) | 10.7 ± 1.6 kgf·m (77.4 ± 11.6 lbf·ft) | p. 32 |
| Battery | 2 × 12V × 80Ah | p. 29 |
| Starting motor | 24 V-3.7 kW | p. 29 |
| Bypass valve set pressure | 1.36 kg/cm2 (19.3 psi) | p. 261 |
| Hydraulic oil filter replacement interval | 250 operating hours | p. 288 |
| Voltage | 20~25V | p. 320 |
| Starter | Nippondenso 24V-3.7kW | p. 366 |
| Back up buzzer | 24V 0.5A 110dB | p. 365 |
| HL740-9 | ||
| Operating Weight | 12000 kg | p. 23 |
| HL740XTD-9 | ||
| Operating Weight | 12300 kg | p. 24 |
| HL740TM-9 | ||
| Operating Weight | 12600 kg | p. 25 |
Hyundai HL740-9, HL740XTD-9, HL740TM-9 Common Problems This Manual Covers
Hyundai HL740-9 won't crank, starter silent after key turn, batteries seem good
Check the batteries first: two 12V 80Ah units in series, spec on page 28. Load test each one, then clean and tighten the terminals. Verify 24 volts reaches the starter solenoid. If voltage is good but the 24V-3.7kW Nippondenso starter stays silent, test the battery relay and maxi fuses before condemning the starter, covered on page 366.
Manual Section: Electrical System p. 366Boom lifts slow and bucket curls weak at full throttle, hydraulic oil looks milky
Check hydraulic oil level in the 151 liter tank and top off with clean oil. Milky oil means water or air; drain and refill, then replace the return filter, due every 250 operating hours per page 288. Test main relief pressure against the 280 kgf/cm2 setting on page 30 before pulling the pump.
Manual Section: Work Equipment p. 288Boom settles and bucket rolls forward overnight with loader parked on level ground
Warm the hydraulic oil, raise the boom horizontal, and measure rod movement at each cylinder. The drift limits on page 266 are 25 mm for the boom cylinder and 40 mm for the bucket cylinder. Beyond those numbers, suspect leaking cylinder packings or a scored control valve spool; swap lines between cylinders to isolate which one is bypassing.
Manual Section: Work Equipment p. 266Steering wheel turns hard at idle and articulation jerks during tight turns
Test steering relief pressure with the oil at operating temperature; spec is 20.5 to 21.5 MPa on page 184. Low readings point to a worn steering pump or stuck relief valve. Check suction hoses for kinks, then inspect the steering unit, torquing its mounting bolts to 6.9 kgf·m if loose. Bleed the system after any line work.
Manual Section: Steering System p. 184Brake pedal feels spongy and machine creeps forward on grades with pedal down
Measure service brake pressure at the test port with the engine running; you want 55 bar, per the spec on page 135. If pressure checks out, bleed each wheel end until fluid runs clear with no bubbles. A spongy pedal after bleeding usually means worn disc packs or a leaking brake valve, so pull the wheel ends and inspect.
Manual Section: Brake System p. 135Frequently Asked Questions
What is the AEB calibration on the Hyundai HL740-9 transmission?
The AEB-cycle continues for about 3 to 4 minutes. The determined filling parameters are stored in the EEProm of the electronics. In this way, the error message F6 shown on the display will be cancelled also at non-performed AEB. p. 66
What are the replacement specifications for the battery?
The electrical system section specifies 12V x 130Ah (2EA), while the general specification table lists 2 x 12V x 80Ah — check which pack your machine carries. Gravity readings: 1.280 and over means overcharged, 1.280 to 1.250 is normal, 1.250 and below means discharged. p. 362
What is the tightening torque for the engine mounting bolt (rubber)?
The tightening torque for the engine mounting bolt (rubber, 2EA) is 29.7 ± 4.5 kgf·m (215 ± 32.5 lbf·ft). p. 32
What is the engine oil quantity for the Cummins QSB6.7 engine?
The engine oil quantity for the Cummins QSB6.7 engine is 18 liters (4.8 U.S. gal). p. 29
What is the maximum cycle time for boom raise on an HL740-9?
The maximum cycle time for boom raise on an HL740-9 is 5.5 seconds. p. 287
How quickly can I access this Hyundai HL740-9 manual after buying?
Delivery is instant: a 397-page searchable PDF is yours the second checkout clears. Laptop, tablet, or phone, all fine.
Is this Hyundai HL740-9 Service Manual printable?
Yes. No DRM, nothing blocks printing, so run off the pages you need on whatever printer you have.
Reviews
There are no reviews yet.