Link Belt HC-108 Crane Service Pdf Manual
Link-Belt HC-108 Crane Service PDF Manual
The Link-Belt HC-108 is a 35 U.S. ton lattice boom truck crane developed for demanding lifting operations in bridge construction, refinery maintenance, steel erection and heavy industrial projects. Designed with a rugged revolving upper structure, two-speed hoisting system and the proven Speed-O-Matic (S-O-M) hydraulic control system, the HC-108 delivers dependable lifting performance while remaining highly serviceable. This OEM Factory Service PDF Manual contains the original Link-Belt workshop procedures used to inspect, diagnose, overhaul and reassemble every major crane system according to factory specifications.
Purpose-Built for Complete Workshop Rebuilds
The HC-108 was engineered so major assemblies—including the upper revolving frame, drum drives, hydraulic controls and boom structures—can be rebuilt individually instead of replaced as complete units. The factory manual follows the same service sequence used by Link-Belt dealership technicians, helping workshops restore lifting performance while minimizing downtime.
Machine Information
| Specification | Details |
|---|---|
| Manufacturer | Link-Belt Cranes |
| Model | HC-108 |
| Machine Type | Heavy-Duty Lattice Boom Truck Crane |
| Maximum Rated Capacity | 35 U.S. Tons |
| Boom Configuration | Angle Boom or Tubular Boom with Fly & Jib Options |
| Hoisting System | Two-Speed Planetary Hoists with Optional Third Drum |
| Hydraulic System | Speed-O-Matic (S-O-M) Hydraulic Controls |
| Counterweight System | Hydraulic Counterweight Removal |
| Upper Structure | 360° Revolving Machinery Platform |
| Applications | Steel Erection, Refineries, Bridge Construction, Industrial Plants and Heavy Infrastructure Projects |
Factory Workshop Coverage
- General workshop instructions and service procedures.
- Upper revolving frame overhaul and machine undecking procedures.
- Conical roller bearing inspection and gear case lubrication system.
- Swing lock controls and swing brake servicing.
- Low gantry, retractable gantry and hydraulic retractable gantry repairs.
- Hydraulic counterweight removal system maintenance.
- Vertical shaft assemblies including center drive shaft, swing shaft and swing brake shaft.
- Horizontal shaft servicing including reverse shaft, reduction shaft and boom hoist shaft.
- Front, rear and optional third drum shaft overhaul with complete brake adjustments.
- Two-speed drum assemblies, planetary drives and planetary brake repairs.
- Clutch assemblies including third drum clutch and clutch rotating joint.
- Upper engine compartment servicing with GMC, Cummins and Caterpillar wiring diagrams for standard and elevated cab configurations.
- Chain case inspection and maintenance.
- Speed-O-Matic hydraulic diagnostics covering pumps, accumulators, unloading valves, relief valves, filters, solenoid valves and control valves.
- Control stand servicing together with hydraulic tube and fitting repairs.
- Angle boom, tubular boom, fly, jib and hydraulic boom live mast repair procedures.
- Tagline winder, tag & magnet reel servicing plus capscrew torque specifications and component inspection standards.
Manual Specifications
| Manual Section | Coverage |
|---|---|
| Upper Structure | Revolving Frame, Gantry & Counterweight Systems |
| Mechanical Drive | Planetary Drives, Drum Assemblies & Clutches |
| Hydraulic System | Complete S-O-M Diagnostics & Repairs |
| Electrical System | GMC, Cummins & Caterpillar Wiring Diagrams |
| Boom Assemblies | Angle Boom, Tubular Boom, Fly, Jib & Live Mast |
| Special Equipment | Tagline Winder & Magnet Reel |
| Specifications | Torque Values & Inspection Standards |
| Document Format | Searchable PDF |
| Language | English |
| Delivery | Instant Digital Download |
Why This OEM Manual Is Essential
The HC-108 combines heavy-duty structural components with sophisticated hydraulic and mechanical systems that require precise factory repair procedures. This OEM manual explains how to rebuild planetary hoists, service hydraulic counterweight equipment, troubleshoot the S-O-M hydraulic system, repair boom assemblies and maintain factory electrical circuits. Following the original Link-Belt service procedures helps extend component life, reduce unplanned downtime and maintain safe lifting performance.
Frequently Asked Questions
Does this manual include hydraulic counterweight removal procedures?
Yes. The manual contains complete factory procedures for servicing and repairing the hydraulic counterweight removal system.
Are two-speed planetary drives and the optional third drum covered?
Yes. It includes overhaul procedures for two-speed planetary drives, planetary brakes, third drum shafts and third drum clutch assemblies.
Does it include factory wiring diagrams?
Yes. Wiring diagrams are provided for GMC, Cummins and Caterpillar engine installations, including standard and elevated cab configurations.
Are both angle and tubular boom repairs included?
Yes. Dedicated repair procedures cover angle boom, tubular boom, fly, jib and hydraulic boom live mast assemblies.
Who should use this service manual?
This manual is intended for crane repair workshops, fleet maintenance departments, heavy equipment rebuild specialists, rental companies and professional technicians servicing the Link-Belt HC-108 truck crane.