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Part of the Hyundai Repair Manuals.
Chasing hydraulic pressures for your skid steer? This 138-page Hyundai HSL650-7 Service Manual PDF walks the whole loader, from safety and maintenance intervals through the hydrostatic drive to final troubleshooting. You get the complete hydraulic circuit diagram with component testing procedures, full electrical wiring diagrams with component locations, and troubleshooting logic charts for the transmission's closed circuit. Step-by-step teardowns take you through the main and auxiliary pumps, travel motors, main control valve, self-level valve, and boom and bucket cylinders, with reassembly torques included. Set the main relief at 175 kgf/cm2 (2490 psi), torque the pump mounting nuts to 19.6 kgf·m (142 lbf·ft), and change fluid and filter every 500 hours. No more bleeding a hydrostatic system on guesswork. Bookmarked with a real text layer: search a spec, jump to the section, pull it up on your phone in the shop.
What's Inside This Hyundai HSL650-7 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 1-21 | Safety Hints, Specifications, Maintenance |
| Hydraulic Circuit and Component Testing | 22-29 | Hydraulic Circuit Diagram, Component Testing Procedures, Main Control Valve Pressure, Auxiliary Pump Flow, Hydrostatic Control Pump Pressure |
| Self Level Valve | 30-35 | Self Level Valve Structure, Hydraulic Circuit, Self Leveling Operation, Bucket Cylinder Extension, Retracting Boom Cylinder |
| Auxiliary Pump and Main Pump | 36-50 | Auxiliary Pump Removal and Installation, Pump Disassembly and Assembly, Main Pump Removal and Installation, Main Pump Structure |
| Transmission Hydraulic Support System | 51-61 | Transmission General Description, Basic Closed Circuit, Charge System, High Pressure Relief Valves, Troubleshooting Logic Diagrams |
| Inspections, Adjustments, and Maintenance | 62-70 | Manual Displacement Control, Relief Valve Inspection, Neutral Bracket Adjustment, Control Spool Disassembly |
| Travel Motor | 71-83 | Travel Motor Removal and Installation, Travel Motor Structure, Travel Motor Disassembly and Assembly, Reassembly Procedures |
| Main Control Valve | 84-91 | Main Control Valve Removal and Installation, Valve Structure, Boom Spool Disassembly, Bucket Spool Disassembly, Load Check Valve |
| Boom and Bucket Cylinders | 92-96 | Cylinder Removal and Installation, Cylinder Structure, Cylinder Disassembly and Assembly, Tightening Torque Specifications |
| Electrical System | 97-116 | Component Location, Wiring Diagram |
| Power Train | 117-122 | Power Train Component, Front and Rear Axle |
| Control | 123-129 | Hand Control, Parking Brake, Attachment Holder |
| Troubleshooting | 130-138 | Travel Hydraulics, Boom and Bucket Hydraulic, Power Train, Control, Electrical System |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main pump capacity | 2 x 46 cc/rev | p. 13 |
| Main pump maximum operation pressure | 250 kgf/cm2 (3560 psi) | p. 13 |
| Nut(2) tightening torque | 19.6±2.9kgf·m (142±21.0lbf·ft) | p. 46 |
| Bolt(3) tightening torque | 6.9±1.4kgf·m (49.9±10.1lbf·ft) | p. 46 |
| Fluid and filter change interval | 500hrs | p. 57 |
| Tightening torque for mounting bolt(4) | 12.8 ± 3.0 kgf·m (92.6 ± 21.7 lbf·ft) | p. 72 |
| Tightening torque for cover(2) bolt(1) | 6.9 ± 1.4 kgf·m (49.9 ± 10.1 lbf·ft) | p. 72 |
| Tightening torque for cover(23) and bearing(21) screw(34) | 27 to 31.8 kgf·m (195 to 230 lbf·in) | p. 81 |
| Tightening torque for 4 hexagonal bolts(65) | 164.5 to 177 kgf·m (1190 to 1280 lbf·in) | p. 83 |
| Oil quantity | 10.5 L (2.8 U.S.gal) | p. 121 |
| Engine oil quantity | 7.6 L | p. 15 |
| Main relief valve pressure | 175 kgf/cm2 | p. 14 |
Hyundai HSL650-7 Common Problems This Manual Covers
Hyundai HSL650-7 boom raises slow, bucket curls weak, hydraulics groan once the oil warms up
Check the hydraulic oil level and condition first; change fluid and filter if past the 500 hour interval. Tee a pressure gauge into the circuit using the component testing procedures starting on page 22, then verify the main relief valve opens at 175 kgf/cm2. Adjust or replace the relief if pressure reads low.
Manual Section: Hydraulic Circuit and Component Testing p. 22One side stops driving or crawls, grinding noise from the travel motor when turning
Test charge pressure at the hydrostatic pump before condemning the motor, using the testing procedures on page 22. If pressure checks good, remove the travel motor per the procedure starting on page 71 and inspect the gears, shafts, and seals for wear. Torque the mounting bolts to 12.8 ± 3.0 kgf·m (92.6 ± 21.7 lbf·ft) on reinstall.
Manual Section: Travel Motor p. 71Hydraulic power fades after twenty minutes of work, every function slows down when oil is hot
Verify main pump pressure against the 250 kgf/cm2 maximum with the system at full operating temperature; a pump that tests fine cold but drops off hot is worn internally. Follow the removal and rebuild procedure starting on page 36, and hold the 19.6 ± 2.9 kgf·m nut torque called out on page 46 during reassembly.
Manual Section: Auxiliary Pump and Main Pump p. 36Growling or clunking from the final drive chaincase, machine jerks when starting to travel
Drain the chaincase and inspect the oil for metal flakes, then refill with 10.5 L (2.8 U.S. gal). Inspect the chain and front and rear axle components covered in the power train section beginning on page 117, and torque the retaining nut to the 76 lbf·ft (103 Nm) spec on page 122 after any shaft service.
Manual Section: Power Train p. 121Boom leaks down with the engine off, bucket dumps slowly on its own overnight
Raise the boom, shut the engine off, and time the drift rate. Reseal the boom cylinders using the disassembly procedure starting on page 92, matching the seal kit to the 63 mm bore and 40 mm rod. If drift continues after resealing, inspect the load check valve in the main control valve section starting on page 84.
Manual Section: Boom and Bucket Cylinders p. 92Frequently Asked Questions
How do I reset the hydraulic system on a Hyundai HSL650-7?
After an operator brings the seat bar down and starts the engine, the operator must momentarily press the reset switch to get the boom/bucket function unlocked. p. 110
What are the torque specs for Hyundai HSL650-7 travel motor bolts?
The tightening torque for the travel motor mounting bolts is 12.8 ± 3.0 kgf·m (92.6 ± 21.7 lbf·ft). p. 72
What are the torque specs for Hyundai HSL650-7 hydraulic pump bolts?
The tightening torque for the auxiliary pump bolts is 3.7 to 4.2 kgf·m. For the main pump, the nut(2) torque is 19.6 ± 2.9 kgf·m and the bolt(3) torque is 6.9 ± 1.4 kgf·m. p. 36
What is the recommended oil capacity for the hydraulic tank?
The hydraulic tank capacity is 38 liters (10.0 U.S. gal) for the tank, and 45 liters (11.9 U.S. gal) for the total system. p. 15
What is the recommended service interval for changing the hydraulic fluid and filter?
It is recommended that the hydraulic fluid and filter be changed every 500 hours of operation. p. 57
Is this Hyundai HSL650-7 Service Manual a digital download?
You get a 138-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 specific sections of this Hyundai HSL650-7 Service Manual?
Yes, printing is unrestricted: a single page, a chapter, or the lot, on letter or A4.
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