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Part of the Hyundai Repair Manuals.
Need factory answers for your Hyundai HSL650-7A skid steer loader? This 194-page Hyundai HSL650-7A service manual PDF walks you through the HST pump, travel motors, main control valve, and every hydraulic circuit in between. Inside: full wiring diagrams with electrical component locations, hydraulic schematics for the HST, auxiliary, and charge pump circuits, and step-by-step disassembly procedures for the travel motor, self level valve, and boom and bucket cylinders. A dedicated troubleshooting section runs travel hydraulics, power train, and electrical faults down to root cause. When you rebuild the pump, torque the section bolts to 14.3 kgf·m (103 lbf·ft) in a crisscross pattern and hold the auxiliary pump hardware at 3.7 to 4.2 kgf·m. No more chasing wiring faults with a multimeter and a prayer. Bookmarked and keyword-searchable; pull it up on your phone in the shop and get back to work.
What's Inside This Hyundai HSL650-7A Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 1-21 | Safety Hints, Machine Specifications (Bucket Capacity and Width, Clearance Circles, Chain Case, Control Method), Engine Data (Compression Ratio, Combustion Chamber Type, Cooling Method), Axial Tandem Piston Pump Data, Maintenance Schedule |
| Hydraulic System Overview and Component Testing | 22-35 | Hydraulic Circuit, Component Testing, HST Pump, Auxiliary Pump, Charge Pump Pressure |
| Self Level Valve and Auxiliary Pump Maintenance | 36-57 | Self Level Valve Structure, Auxiliary Pump Removal and Install, Pump Disassembly and Assembly, Bearing Maintenance |
| HST Pump (Mechanical and Pilot Types) | 58-84 | HST Pump Removal and Install, HST Pump Structure, Charge Pump Options, Filtration Options |
| Travel Motor Maintenance | 85-107 | Travel Motor Removal and Install, Travel Motor Structure, Brake Motor Disassembly, Brake Motor Assembly |
| Main Control Valve and Cylinder Maintenance | 108-148 | Main Control Valve Removal and Install, Spool Disassembly and Assembly, Boom Cylinder Maintenance, Bucket Cylinder Maintenance |
| Electrical System | 149-171 | Component Location, Wiring Diagram, Electrical Component Specification |
| Power Train | 172-177 | Power Train Component, Front and Rear Axle |
| Control | 178-185 | Mechanical Control, Pilot Control, Attachment Holder |
| Troubleshooting | 186-194 | Travel Hydraulics, Boom and Bucket Hydraulic, Power Train, Control, Electrical System |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Battery | 1 x 12V x 100~120Ah | p. 12 |
| Starting motor | 12V-2.0kW | p. 13 |
| Tightening torque | 3.7~4.2 kgf·m (26.8~30.4 lbf·ft) | p. 42 |
| Tightening torque for pump bolts | 14.3 kgf·m (103 lbf·ft) | p. 48 |
| Tightening torque for bolts (1st working section) | 14.3 kgf·m (103 lbf·ft) | p. 56 |
| Tightening torque for bolts (2nd working section) | 4.59 kgf·m (33.2 lbf·ft) | p. 56 |
| Hydraulic oil filter change interval | 500hrs | p. 68 |
| Hydraulic fluid filter micron rating | 10 micron | p. 67 |
| Tightening torque for mounting bolt(4) | 23.4 ± 3.5 kgf·m (169 ± 25 lbf·ft) | p. 105 |
| Tightening torque for bolt(1) | 6.9 ± 1.4 kgf·m (49.9 ± 10.1 lbf·ft) | p. 105 |
| Start motor | 12V, 2.0kW | p. 168 |
| Engine Oil Quantity | 9.5 L | p. 13 |
Hyundai HSL650-7A Common Problems This Manual Covers
Hyundai HSL650-7A hydraulic functions weak or dead, bucket and boom barely move
Check hydraulic fluid level and condition first; milky or dark oil means contamination. Test charge pressure using the procedure on page 72; anything below 260 psi (18 bar) points to a worn charge pump or plugged filter. Replace the 10 micron hydraulic filter, then verify the main relief holds 175 kgf/cm2.
Manual Section: Hydraulic System Overview and Component Testing p. 72Engine cranks slowly or will not turn over at all, worse on cold mornings
Load test the battery first; spec is 12V, 100 to 120Ah, and a weak cell will not spin the 12V, 2.0kW starter. Clean and tighten both ground cables at the frame. If cranking still drags, trace the start circuit on the wiring diagram on page 166 before condemning the starter; corroded connections mimic a dead motor.
Manual Section: Electrical System p. 166Machine loses drive power on one side or will not travel in a straight line
Check the troubleshooting procedures starting on page 187 before pulling anything apart. Verify charge pressure stays above 260 psi (18 bar) under load; a starved charge circuit kills the drive loop. If one travel motor tests weak, follow the removal procedure beginning on page 85 and inspect the seals and plates for scoring.
Manual Section: Travel Hydraulics Troubleshooting p. 187Hydraulic pump whines or growls under load and gets louder when the boom lifts
Check the fluid level with the boom down; a low tank lets the pump suck air and cavitate. Inspect the suction line and hose clamps for spots pulling air in. Replace the 10 micron filter if it is anywhere near the 500 hour interval, then run the machine at idle and listen again.
Manual Section: HST Pump (Mechanical and Pilot Types) p. 67Engine temperature climbs into the red during heavy pushing or long transport runs
Check coolant level cold; the radiator holds 3.6 L, and running even a liter low will spike temps under load. Blow out the radiator and oil cooler fins from the engine side; skid steers plug up fast in dusty work. Verify fan belt tension and thermostat operation before suspecting the water pump.
Manual Section: General p. 130Frequently Asked Questions
What are the torque specifications for the Hyundai HSL650-7A travel motor bolts?
The mounting bolts for the travel motor (bolt 4) must be tightened to a torque of 23.4 ± 3.5 kgf·m (169 ± 25 lbf·ft). p. 105
What are the torque specifications for the Hyundai HSL650-7A auxiliary pump bolts?
When joining the auxiliary pump to the HST pump, the bolts (5) must be tightened to a torque of 3.7 to 4.2 kgf·m (26.8 to 30.4 lbf·ft). p. 42
What is the recommended replacement interval for the hydraulic oil filter?
It is recommended that the hydraulic oil filter be changed every 500 hours of operation. p. 68
What is the engine oil capacity for the Hyundai HSL650-7A?
The engine oil capacity for the engine oil pan is 9.5 liters (2.5 U.S. gallons). p. 15
What is the correct procedure to reset the hydraulic system after maintenance?
After running the engine, push the control lever all the way forward and pull it backward three times, then operate the control lever for three minutes at 3-second intervals to raise the hydraulic oil temperature. p. 20
Is this Hyundai HSL650-7A Service Manual a digital download?
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