Part of the Hyundai Repair Manuals.
All 426 pages of this Hyundai HL750TM, Cummins B5.9-C Service Manual PDF focus on one machine: your HL750TM wheel loader and the Cummins diesel that powers it. You get factory wiring diagrams for the starting, charging, and monitoring circuits, plus hydraulic schematics tracing oil from the main pump through the control valve to the boom and bucket cylinders. Inside: full troubleshooting sections for the power train, brake, steering, and work equipment systems, backed by page after page of pressure tests, leakage checks, and assembly procedures. Torque the main pump housing bolts to 19.6 ± 2.9 kgf·m, then confirm the pump holds its 210 kgf/cm² maximum operating pressure. No more chasing wiring faults with a multimeter and a prayer. Bookmarked with a real text layer; type in a spec, jump to the section, and get back to work.
What's Inside This Hyundai HL750TM Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 9-31 | Safety Hints, Specifications (Major Component, Weight, Specification for Major Components, Tightening Torque of Major Component, Torque Chart, Recommended Lubricants) |
| Engine | 32-38 | Structure and Function, Structure, Cooling System (Thermostat), Fuel System |
| Power Train System | 39-155 | Structure and Function (Power Train Component Overview, Torque Converter, Transmission, Egs Lever, Axle, Final Drive, Tire and Wheel) |
| Brake System | 156-201 | Structure and Function (Outline, Brake Pump, Brake Valve, Cut-Off Valve, Parking Brake Cylinder, Brake Accumulator, Pressure Switches, Parking Brake) |
| Steering System | 202-266 | Structure and Function (Outline, Priority Valve, Steering Valve, Cushion Valve, Steering Cylinder), Operational Checks and Troubleshooting |
| Work Equipment | 267-348 | Structure and Function (Hydraulic System Outline, Main Pump Operation, Remote Control Valve, Main Control Valve, Pilot Oil Supply Unit, Safety Valve Unit, Boom and Bucket Cylinder, Hydraulic Oil Tank, Accumulator) |
| Electrical System | 349-426 | Component Location |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main pump housing mounting bolt torque | 19.6 ± 2.9 kgf·m | p. 25 |
| Main control valve mounting socket bolt torque | 7.2 ± 1.6 kgf·m | p. 25 |
| Main pump capacity | 44 + 41 cc/rev | p. 22 |
| Main pump maximum operating pressure | 210 kgf/cm² | p. 22 |
| Pressure regulating valve setting | 414kPa (60psi) | p. 36 |
| Oil pressure difference between engines | 69kPa (10psi) | p. 36 |
| Priority valve relief pressure | 20.5-21.5 MPa (205-215 bar, 3200-3300 psi) | p. 229 |
| Steering valve setting pressure adjustment | 1 turn = 70kgf/cm2 | p. 235 |
| System(M) relief pressure | 210 ± 5 kg/cm² (3000 ± 70 psi) | p. 320 |
| Engine oil quantity | 16.4 L | p. 22 |
| Transmission oil capacity | 25 L | p. 28 |
| Engine oil pan capacity | 16.4 L | p. 28 |
Hyundai HL750TM Common Problems This Manual Covers
Hyundai HL750TM steering wheel heavy at low idle, slow response even at high RPM
Check the steering troubleshooting chart starting. Test priority valve relief pressure; it should read 20.5 to 21.5 MPa (205 to 215 bar). If low, adjust the steering valve setting screw; one full turn changes pressure about 70 kgf/cm2, per page 235. Remove and clean the relief valve if dirt keeps the spool stuck.
Manual Section: Steering System Troubleshooting p. 235Hydraulic oil overheats under load, boom and bucket functions turn sluggish
Check hydraulic oil temperature first; it must never pass 80 degrees C. Clean plugged oil cooler fins with compressed air, then test main relief pressure against the 210 ± 5 kg/cm2 (3000 ± 70 psi) spec on page 320. Stop holding functions over relief, and work the overheating chart on pages 309 through 312 if the problem stays.
Manual Section: Work Equipment Hydraulic Troubleshooting p. 320Boom drops slowly with a loaded bucket, drifts noticeably overnight
Measure boom cylinder rod movement with the bucket loaded and boom raised; anything past the 20 mm drift limit on page 323 means internal leakage. Inspect the boom cylinder piston seals and replace worn ones, then check the main control valve for scored spools. Torque control valve mounting socket bolts to 7.2 ± 1.6 kgf·m per the chart on page 25.
Manual Section: Work Equipment Hydraulic Troubleshooting p. 323Machine won't move or transmission slips in all gears once the oil warms up
Check transmission oil level first; the system holds 25 L, and low oil kills clutch pressure. Verify the clutch cut-off pressure switch operates at its 25 kgf/cm2 rating from page 84, then run the low-pressure checks in the troubleshooting procedures starting. Drain and refill with fresh oil and a new filter if it smells burnt.
Manual Section: Transmission Troubleshooting p. 84Engine oil pressure lamp flickers at idle when the engine is hot
Check oil level on the dipstick; the pan holds 16.4 L. Watch the pressure gauge next: a drop of 60 kPa (10 psi) below normal operating pressure points to a plugged filter, whose bypass valve opens at a 138 kPa (20 psi) differential, per page 37. Replace the filter and retest before condemning the pressure sender.
Manual Section: Engine p. 37Frequently Asked Questions
What is the torque specification for the engine mounting bolts on a Hyundai HL750TM?
The torque specification for the engine mounting bolts and nuts is 6.9 ± 1.4 kgf·m (50 ± 10 lbf·ft). p. 25
What is the recommended oil capacity for the engine oil pan?
The engine oil pan capacity for the Hyundai HL750TM is 16.4 liters (4.3 U.S. gallons). p. 28
What is the procedure for checking the transmission oil warm-up?
To warm up the transmission oil, start the engine, apply service brakes, and release the parking brake. Move the EGS lever to 3rd speed, then to forward 'F' position. Increase engine speed to high idle for 30 seconds, then move to neutral 'N' for 15 seconds. Repeat until the transmission temperature gauge arrow points to the bar above the dial. p. 73
What is the rated pressure for the clutch cut-off pressure switch?
The rated pressure for the clutch cut-off pressure switch is 25 kgf/cm². p. 84
What is the maximum pump flow for the main hydraulic pump?
The maximum pump flow for the main hydraulic pump is 182 liters/min (48 gpm). p. 319
Do I get instant access to this Hyundai HL750TM Service Manual?
You get a 426-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Can I print a copy of this Hyundai HL750TM Service Manual for the shop?
Yes. No DRM, nothing blocks printing, so run off the pages you need on whatever printer you have.
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