Link Belt HC-78B Crane Service Pdf Manual
Link-Belt HC-78B Crane Service PDF Manual
The Link-Belt HC-78B is a 35 U.S. ton lattice boom truck crane, developed as an upgraded version of the HC-78A with increased lifting capacity, improved carrier systems and enhanced hydraulic performance. Designed for bridge construction, industrial plant maintenance, utility installation and heavy material handling, the HC-78B combines dependable road travel with a durable revolving upper structure. This OEM Factory Service PDF Manual provides the original Link-Belt workshop procedures used to diagnose, repair and overhaul every major mechanical, hydraulic and electrical system, allowing technicians to restore the crane to factory operating standards.
Built for High-Capacity Field Service
Unlike earlier HC-Series models, the HC-78B incorporates hydraulic outriggers, a rotating joint, two-speed planetary drive, optional third drum and both angle and tubular boom configurations. The factory manual follows the complete workshop sequence used by Link-Belt service departments, making complex repairs easier while reducing unnecessary component replacement.
Machine Information
| Specification | Details |
|---|---|
| Manufacturer | Link-Belt Cranes |
| Model | HC-78B |
| Machine Type | Lattice Boom Truck Crane |
| Maximum Rated Capacity | 35 U.S. Tons |
| Carrier | Rubber Tire Truck Carrier |
| Boom Configuration | Angle Boom or Tubular Boom with Fly & Jib Options |
| Hoisting System | Two-Speed Planetary Hoists with Optional Third Drum |
| Outriggers | Hydraulic Beam & Jack Cylinders |
| Swing System | Mechanical Swing Drive with Swing Brake |
| Applications | Heavy Construction, Industrial Plants, Utility Projects, Steel Erection and Infrastructure Work |
Factory Workshop Coverage
- General workshop instructions and service information.
- Carrier servicing including front axle, wheel alignment, steering gear and power steering pump.
- Front and rear brake assemblies, brake actuators, rear axle repairs and air brake troubleshooting.
- Hydraulic outrigger diagnostics, beam cylinders, telescoping tubes, jack cylinders and lock valves.
- Flow control valve servicing and complete hydraulic system cleaning procedures.
- Carrier electrical wiring, engine wiring, lighting circuits and electrical wire identification.
- Rotating joint removal, overhaul and installation.
- Upper revolving frame, turntable bearing, swing lock and retractable gantry repairs.
- Vertical shaft assemblies, swing brake shaft, intermediate shaft and center drive shaft servicing.
- Horizontal shafts, reverse shaft, reduction shaft and boom hoist shaft overhaul.
- Front, rear and optional third drum shafts with brake adjustment procedures.
- Two-speed planetary drive servicing and planetary brake adjustment.
- Complete clutch assembly repairs including third drum clutch.
- Upper engine compartment service and chain case maintenance.
- Speed-O-Matic hydraulic power supply diagnostics, pumps, accumulator, unloading valve, relief valve and control valves.
- Angle boom repair together with tubular boom, fly and jib servicing.
- Tagline winder overhaul, torque specifications and inspection standards for bearings, gears, shafts and housings.
Manual Specifications
| Manual Section | Coverage |
|---|---|
| Carrier | Steering, Axles, Brakes & Air Systems |
| Hydraulic Outriggers | Beam Cylinders, Jacks & Control Valves |
| Upper Structure | Turntable Bearing, Gantry & Swing System |
| Mechanical Drive | Shafts, Clutches, Drum Assemblies & Planetary Drives |
| Hydraulic Power Supply | Speed-O-Matic Diagnostics & Repairs |
| Electrical System | Carrier Wiring, Engine Wiring & Schematics |
| Boom Assemblies | Angle Boom, Tubular Boom, Fly & Jib |
| Special Components | Tagline Winder & Torque Specifications |
| Document Format | Searchable PDF |
| Language | English |
| Delivery | Instant Digital Download |
Why This OEM Manual Is Essential
The HC-78B combines high-capacity lifting performance with complex hydraulic and mechanical systems that require precise workshop procedures. This OEM manual explains factory-approved methods for servicing steering components, hydraulic outriggers, rotating joints, planetary drives, drum hoists, boom structures and the Speed-O-Matic hydraulic system. Following these procedures helps reduce downtime, improve reliability and maintain safe lifting performance throughout the crane's service life.
Frequently Asked Questions
Does this manual include hydraulic outrigger repairs?
Yes. It covers hydraulic troubleshooting, beam cylinders, jack cylinders, telescoping tube assemblies, lock valves and outrigger control valves.
Are third drum and planetary drive procedures included?
Yes. The manual contains complete repair procedures for the optional third drum, planetary drive, planetary brake and associated clutch assemblies.
Does it include electrical wiring diagrams?
Yes. Factory wiring information is provided for the carrier, engine, lighting circuits and electrical identification codes.
Are both angle and tubular boom configurations covered?
Yes. Dedicated repair procedures are included for angle boom structures together with tubular boom, fly and jib assemblies.
Who should use this service manual?
This manual is intended for crane service workshops, fleet maintenance departments, rental companies, heavy equipment rebuild specialists and professional technicians servicing the Link-Belt HC-78B truck crane.