Relief valve settings, pump flow control and circuit routing for these machines are things only the factory can settle, and this 756-page Link-Belt 75 and 80 Spin Ace Tier III service manual PDF is where the factory puts them on record for both hydraulic excavators. Travel, swing, boom and bucket circuits are traced port by port in the hydraulic section, down to pilot hose connections and backup circuits. Wiring and harness diagrams cover the monitor display and engine control, while the maintenance section, by far the largest part of the book, takes you from pressure checks through full disassembly. On the 80, run a 10 µm fuel pre-filter ahead of the 4 µm main filter and a 6 µm return element in the hydraulic tank. Some days it is just you, the machine, and nobody to call. This bookmarked, keyword-searchable PDF rides along on your laptop to whatever site the excavator is working.
What's Inside This Link-Belt 75 & 80 Spin Ace Tier III Manual
| System | Pages | Key Topics |
|---|---|---|
| Specifications | 19-23 | Main Data, Performance, Main Body Dimensions, Engine, Cooling System, Upper Side Work System, Operating Device, Swing Units |
| Hydraulic Equipment | 24 | Hydraulic Device, Control Valve, Cylinder |
| Capacities, Filters | 25-26 | Coolant and Oil Capacities, Hydraulic Oil Filters, Fuel Filter |
| Overall View | 27-28 | Standard Arm, Long Arm |
| Work Range Diagram | 29-30 | Work Range Diagram (80), Standard Arm, Long Arm |
| Optional Components | 31-32 | List of Optional Components |
| Equipment Configuration and Main Equipment Table | 33-53 | Overall Configuration, Operator's Cab, Lower Mechanism, Travel Unit, Rollers, Recoil Spring, Shoes |
| Hydraulic Pump and Control Valve Operation | 54-86 | Hydraulic Pump Operation, Flow Control, Control Valve Operation, Relief Valves, Swing Motor |
| Hydraulic Circuit Section | 87-148 | Port Locations, Pilot Hose Connection, Travel Circuits, Swing Circuit, Bucket Circuit, Boom Circuit, Backup Circuits |
| Electric Circuits Section | 149-184 | Monitor Display, Engine Control, Electric Circuit Diagrams, Harness Diagrams, Wiring Diagrams |
| Measuring / Adjusting Pressure | 185-210 | Measuring Pressure, Adjusting Pressure, Attachment Dimensions, Appendix, Compatibility, Disassembling and Maintenance Instructions |
| Safety | 211-294 | Precautions for Use, Numerical Conversion Table, Main Equipment Table, Fuel / Lubricants and Filters, Main Body Weight, Lifting Capacity |
| Lower Mechanism | 295-378 | Upper Mechanism, Attachments, Take-Up Roller, Rotating Joint, Air Conditioner |
| Maintenance Standards | 379-410 | Check Sheet, Drive Sprocket, Track Shoe, Inspection Gauge |
| Hydraulic Pump | 411-438 | Disassembling and Assembling Instructions, Disassembling Instructions, Assembling Instructions, Disassembling the Gear Pump, Structure Drawing |
| Travel Unit | 439-484 | Service Outline, Disassembly, Assembly, Performance Confirmation Test, Exploded Diagram of Reduction Gear |
| Swing Unit | 485-530 | Maintenance Instructions, Troubleshooting, Tools Used, Checking Quality After Assembly, Exploded Views, Anti-Reverse Valve |
| Control Valve | 531-558 | Maintenance Instructions, Cleaning, Inspection, Relief Valves, List of Control Valve Specifications |
| Cylinder | 559-612 | Maintenance Instructions, Description of Functions, Error Diagnosis, Storage Standards, Special Jigs for Repair |
| Remote Control Valve | 613-656 | Solenoid Valve (3 Stack), Cushion Valve |
| Spin Ace Tier III Shop Manual | 657-756 | Fuel / Lubricants and Filters, Main Body Weight, Maintenance Standards |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Return filter (inside tank) | 6 µm | p. 25 |
| Pilot line filter (inside housing) | 8 µm | p. 25 |
| Main filter | 4 µm | p. 25 |
| Pre-filter | 10 µm | p. 25 |
| Solenoid Valve Power consumption | 17 W max. | p. 42 |
| Solenoid Valve Operating voltage | 20 - 32 V DC | p. 42 |
| Turntable bearing (swing frame) bolt retightening torque | 252 to 283 N·m | p. 673 |
| Travel Unit Operating pressure | 29.4 MPa | p. 36 |
| Travel Unit Operating flow | 68.0 L/min | p. 36 |
| Reduction gear assembly socket head bolt tightening torque | 177±10 N·m | p. 516 |
| Engine Output | 54 HP/2000 rpm | p. 19 |
| Swing Speed | 9.5 rpm | p. 19 |
Link-Belt 75 & 80 Spin Ace Tier III Common Problems This Manual Covers
Link-Belt 75 Spin Ace swing motor does not rotate and reduction gears make abnormal sounds
Check oil pressure at the motor entry side before condemning the motor, following page 485, and confirm the load is not tripping the relief valve. If the gears make abnormal sounds, stop the engine completely, release hydraulic pressure as page 227 warns, and remove the motor from the machine before disassembly, because the machine may start running unexpectedly; verify that the engine and electric motor have stopped completely (page 485). Replace damaged reduction gear parts, or the whole assembly as the general rule, and keep dirt out on reassembly.
Manual Section: Swing Motor Troubleshooting p. 485Swing motor oil seal or O-ring blown out with hydraulic oil leaking from the motor case
Clean the drain pipe and recheck the piping to cut back pressure, following page 486. Oil seal pressure must stay at 1 kgf/cm2 or less in normal use and never exceed 3 kgf/cm2 instantaneous. Check that hydraulic oil temperature stays under the 80 ℃ seal limit. Release hydraulic pressure first (page 227). If the seal job means opening the motor, remove it from the machine first and verify that the engine and electric motor have stopped completely (page 485), then fit the new seal without damaging the lips.
Manual Section: Swing Motor Troubleshooting p. 486Swing motor cavitating during swing with abnormal noises and fluctuating rotation and pressure
Check makeup supply pressure and hydraulic oil level, then reset to defaults as laid out on page 486. After releasing hydraulic pressure (page 227), remove the motor from the machine and verify that the engine and electric motor have stopped completely (page 485). Inspect the makeup valve for foreign substances and a damaged spring; clean, repair, and replace the spring where needed. If drain volume is high from low motor efficiency, check sliding sections for abnormal wear. Readjust relief valve set pressure if relief valves resonate.
Manual Section: Swing Motor Troubleshooting p. 486Swing motor shockless feature not working with greater than usual shock at swing stops
Clean the relief valve assembly and clear foreign substances blocking the orifice section, following page 489. Inspect the piston sliding part for abnormal wear and repair or replace it. If relief valve set pressure has increased, readjust it. Release hydraulic pressure before opening the valve (page 227); if the motor has to be disassembled, remove it from the machine and verify that the engine and electric motor have stopped completely (page 485), and replace parts with deep scratches and large leaks rather than reusing them.
Manual Section: Swing Motor Troubleshooting p. 489Swing parking brake does not release and swing motor does not rotate
Measure release pressure PB (PG) and adjust it to the specified value as shown on page 490. Measure motor drain pressure too; high drain pressure keeps the valve from operating, so inspect the drain circuit for blockage. If the brake piston still does not operate, release hydraulic pressure (page 227), remove the motor from the machine with the engine and electric motor stopped completely (page 485), replace the brake piston O-ring, and clean foreign substances from the sliding section.
Manual Section: Parking Brake Troubleshooting p. 490Anti-reverse valve fault where swing motor does not stop or takes a while to stop
Inspect the check valve assembly seat and sleeve for foreign substances and clear any dirt blocking the valve orifice, following page 524. Overtightened anti-reverse valve bolts also cause a faulty seat, so torque the socket head bolts to 32.4±2.0 N·m per page 516. Release hydraulic pressure first (page 227), and replace parts if the sliding section is scratched.
Manual Section: Anti-Reverse Valve Troubleshooting p. 524Frequently Asked Questions
What is the engine oil capacity for the 80 Spin Ace Tier III?
The engine lubricating oil capacity for the 80 Spin Ace Tier III is 2.4 gallons. p. 25
What is the main relief valve set pressure on the 80 Spin Ace Tier III?
The main relief valve set pressure is 4264 psi for the Boom, Arm, Bucket, and Travel circuits. p. 24
What is the replacement interval for the engine oil filter on the 80 Spin Ace Tier III?
Replace the engine oil filter every 500 hours, per the disposable-items table on page 661. If you run diesel fuel with more than 2500 ppm sulfur, the book shortens engine oil and oil filter element changes to every 250 hours of use (page 267). p. 661
What is the procedure for bleeding air from the hydraulic pump on the 80 Spin Ace Tier III?
Start the engine and keep it at idle. Remove the rubber cap on the air bleeder and loosen the air bleeding valve gradually to bleed air. p. 193
What is the tightening torque for the travel unit mounting bolts on the 80 Spin Ace Tier III?
The tightening torque for the travel unit mounting bolts is 267 to 312 N•m. p. 291
Is this Link-Belt 75 Spin Ace manual a PDF I download?
You get a 756-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Is printing allowed for this Link-Belt 75 Spin Ace Service Manual?
Yes. It prints from any PDF reader, so run off the pages you need for your own repair work.
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