Crane Repair

Maybe the boom is getting slower under load.

Maybe swing is different in one direction. A winch is acting up. An outrigger will not hold. The LMI is preventing a function. Or the crane has an electrical problem that only shows up intermittently.

You already know what the crane is doing.

Mondak's job is to determine why.

A crane working in the United States does not necessarily have a U.S. name on the boom.

We work with equipment from major domestic and international manufacturers including:

• Liebherr
• Tadano
• Demag
• Kobelco
• SANY
• Grove
• Manitowoc
• Link-Belt
• National Crane
• Manitex
• Terex
• IMT
• Stellar
• Auto Crane
• Maintainer
• Zoomlion and more

Common crane families include:

The name on the crane matters.

The components and systems inside it matter just as much.

We troubleshoot and repair problems involving:

• Hydraulic pumps
• Hydraulic motors
• Main control valves
• Proportional valves
• Valve manifolds
• Cylinders
• Hydraulic swivels
• Hoses and hard lines
• Reservoirs and filtration
• Cooling systems
• Pressure and flow problems
• Internal leakage
• Excessive hydraulic temperature

A crane that is slow under load does not automatically need a pump.

Depending on the symptoms, we may test:

• Pressure
• Flow
• Pump output
• Case drain where applicable
• Internal leakage
• Relief and pressure-control functions
• Valve commands
• Hydraulic temperature

We would rather measure what the system is doing than guess at the most expensive component.

Modern cranes rely heavily on electronic controls and safety systems.

Depending on the crane, we can troubleshoot problems involving:

• Load Moment Indicator systems
• Rated Capacity Limiter systems
• Boom angle sensors
• Boom length sensing
• Pressure transducers
• Outrigger sensing
• Proportional controls
• Joysticks
• Solenoids
• Controllers
• CAN communication
• Wiring and connectors
• Power and grounds
• Remote controls
• Function interlocks

A function that will not move may have a hydraulic problem.

Or the hydraulic valve may never be receiving permission to move.

Understanding both sides prevents a lot of unnecessary parts changing.

An all-terrain or rough-terrain crane is also a carrier.

Problems can involve:

• Diesel engines
• Cooling systems
• Fuel systems
• Transmissions
• Axles and differentials
• Steering systems
• Brakes
• Starting and charging
• Emissions and aftertreatment
• Chassis electronics

Mondak can follow the problem into those systems instead of stopping at the crane superstructure.

Large cranes can stay productive for decades.

Eventually, the challenge may become an obsolete controller, unavailable hydraulic component, damaged wiring harness or component that no longer has an easy factory replacement.

Depending on the application, Mondak can look at options such as:

• Repairing the existing component
• Rebuilding hydraulic components
• Cross-referencing replacements
• Repairing controls and wiring
• ECM or controller programming
• Adapting hydraulic connections
• Machining pins and bushings
• Repairing worn bores
• Fabricating components or mounts
• Updating components where appropriate

A discontinued part number does not automatically mean the crane is finished.

Large cranes usually need to be diagnosed where they are.

Mondak provides mobile crane diagnostics and field repair, backed by shop capabilities when we need to bring a pump, motor, cylinder, valve, controller or other component back for more extensive work.

Our machining, fabrication, hydraulic and electronic capabilities give the field technician somewhere to go when the repair becomes more than a service-truck job.