The PDC crane system is no longer supported. PDC, which was a brand under the PAT group of crane safety systems, has been discontinued, meaning spare parts, software updates, and manufacturer technical support are no longer available through the original supplier. For crane operators and owners still running PDC equipment, this creates a pressing need to assess risk and plan for a certified replacement.
This article works through the most common questions surrounding the PDC crane system: what happened to it, what the risks are of continuing to operate it, and what your options are for repair, upgrade, or replacement.
What happened to the PDC crane system?
PDC was a crane safety and control system brand that operated under the broader PAT (Pressure, Angle, and Tension) family of products. Over time, the product line was consolidated and eventually discontinued, leaving installed systems without active manufacturer support. This means no new firmware releases, no official spare parts supply chain, and no technical help desk from the original developer.
This situation is not unique to PDC. The crane safety industry has seen several legacy system brands absorbed, discontinued, or replaced as technology has advanced. What makes the PDC situation particularly significant is the number of installations that remain in active service globally. Many cranes fitted with PDC load moment indicators and crane control systems continue to operate, often without their owners being fully aware that the system is now end-of-life from a support perspective.
The practical consequence is that when a PDC system fails, there is no manufacturer to call. Replacement parts may exist in third-party inventories, but availability is finite and shrinking. Software issues cannot be escalated to a developer who still maintains the codebase. This shifts the entire burden of system integrity onto the crane owner and their chosen service provider.
What are the risks of running an unsupported crane safety system?
Running an unsupported crane safety system like a PDC unit introduces serious operational, legal, and safety risks. Without access to manufacturer support, spare parts, or certified software updates, the system’s ability to perform its core function, preventing overload and protecting personnel, cannot be guaranteed to the same standard as a supported system.
The risks fall into several distinct categories:
- Safety risk: A load moment indicator or safe load limiter that cannot be serviced to manufacturer specification may give inaccurate readings or fail to trigger alarms at the correct load threshold. In crane operations, this directly endangers personnel and equipment.
- Compliance risk: Most jurisdictions require crane safety systems to be maintained in accordance with manufacturer guidelines. An unsupported system makes this compliance path difficult to document and defend during an inspection or incident investigation.
- Certification risk: Annual thorough examinations and periodic recertification of crane safety systems typically require evidence that the system is functioning within its specified parameters. An unsupported system may fail to meet the documentation requirements expected by a competent person or third-party inspection body.
- Operational risk: If a PDC system fails mid-operation and no compatible replacement part is immediately available, the crane may be taken out of service with no clear timeline for return. Unplanned downtime on offshore or heavy lifting projects carries significant financial consequences.
- Insurance risk: Insurers covering cranes and lifting operations may challenge claims where the safety system involved was known to be unsupported and no remediation plan was in place.
The longer an unsupported system remains in service without a plan, the greater the accumulated exposure across all of these risk categories.
Can a PDC system be repaired or upgraded instead of replaced?
In some cases, a PDC system can be partially repaired or extended in life, but a full replacement is usually the more reliable and future-proof outcome. Whether repair is viable depends on the specific failure mode, the availability of compatible components, and the technical expertise of the service provider involved.
When repair may be possible
If the PDC system has a discrete hardware failure, such as a damaged display unit, a faulty sensor, or a wiring issue, it may be possible to source compatible components from specialist inventories and restore function. Some independent crane safety specialists maintain stocks of legacy parts specifically for this purpose. PCB-level repair is also an option in some cases, where the failed circuit board can be diagnosed and restored rather than replaced wholesale.
This approach can extend the operational life of a PDC system, but it does not resolve the underlying issue of the system being unsupported. A repaired PDC unit is still a PDC unit with no manufacturer backing, and the same compliance and certification challenges remain.
When upgrade or replacement is the better path
If the PDC system has a software fault, a calibration drift that cannot be corrected through standard adjustment, or a failure in a component that is no longer available, repair becomes impractical. In these situations, upgrading to a modern, fully supported crane safety system is the only way to restore both function and compliance. An upgrade also brings the crane into alignment with current safety standards, which may be a requirement for ongoing certification depending on the jurisdiction and the crane’s application.
What systems are compatible replacements for the PDC?
Several modern crane safety systems are technically compatible with the sensor infrastructure and crane configurations typically associated with PDC installations. The most important consideration when selecting a replacement is not brand-for-brand equivalence, but functional equivalence: the replacement system must perform the same safety-critical functions, be certifiable for the crane’s rated capacity and duty class, and integrate with the crane’s existing wiring and sensor layout where possible.
Common replacement options for PDC crane systems include:
- PAT DS350 and DS150 systems: As PDC operated within the PAT product family, modern PAT systems are a natural replacement path. These systems offer load moment indication, rated capacity indication, and safe load limiting functions compatible with a wide range of crane types.
- RaycoWylie systems: The i4000 and related series are widely used as drop-in functional replacements on cranes where PDC systems have been decommissioned.
- Hirschmann (Liebherr) systems: For larger crane applications, Hirschmann systems provide high-specification load management and anti-two-block functionality.
- Custom-engineered solutions: For cranes with unusual configurations, non-standard duty cycles, or specialist applications such as offshore or ATEX-classified environments, a bespoke crane control system may be the most appropriate route. This involves engineering a solution around the crane’s specific parameters rather than fitting an off-the-shelf product.
Sensor compatibility is a key practical factor. Many cranes running PDC systems use standard load pins, pressure transducers, or angle sensors that are compatible with modern replacement systems, which can reduce the cost and complexity of the changeover.
How does a PDC system replacement get installed and commissioned?
A PDC system replacement follows a structured process that begins with a site survey and ends with documented commissioning and calibration. The process typically takes place in several stages, and the crane must be taken out of service for at least part of the installation period.
- Site survey and system assessment: A qualified engineer inspects the existing PDC installation, documents the crane’s configuration, identifies which sensors and wiring can be reused, and specifies the replacement system. This stage also confirms the crane’s rated capacity, boom configuration, and any special operating conditions.
- System design and procurement: The replacement crane safety system is selected or engineered based on the survey findings. If custom components are required, such as bespoke load pins or control panels, these are fabricated at this stage.
- Removal of the PDC system: The existing PDC hardware is decommissioned and removed. Wiring that can be retained is documented and preserved; wiring that is incompatible with the new system is replaced.
- Installation of the new system: The replacement system is physically installed, including display units, control boxes, sensors, and any new cabling. For offshore or ATEX-classified environments, all components must meet the relevant certification requirements before installation.
- Calibration: The new system is calibrated against known test loads to verify that the load moment indicator and safe load limiter are reading accurately across the crane’s operating envelope. Calibration records are documented for certification purposes.
- Commissioning and handover: The system is tested under operational conditions, and the crane operator is trained on the new interface. Full documentation, including calibration certificates and system specifications, is handed over to the owner.
Who is responsible for certifying a replaced crane safety system?
Responsibility for certifying a replaced crane safety system sits with the crane owner, but the practical work of achieving certification involves a competent person or accredited inspection body. When a PDC system is replaced, the crane does not automatically carry forward its existing certification. The new system must be independently verified as fit for purpose before the crane returns to service.
In most regulatory frameworks, the crane owner has a legal duty to ensure that the crane and all its safety-critical systems are maintained in a safe condition and examined at the required intervals. Replacing a safety system is a significant modification, and in many jurisdictions it triggers a requirement for a thorough examination before the crane is put back into service.
The competent person conducting the examination will typically want to see:
- Documentation confirming the specification of the replacement system
- Calibration certificates showing the system has been set correctly for the crane’s rated capacity
- Evidence that the system has been installed by a qualified engineer
- Confirmation that any ATEX or other environmental certifications are current and applicable
The installing engineer or service provider should supply all of this documentation as part of the commissioning handover. The crane owner then presents this to the inspection body as part of the thorough examination process. It is the crane owner’s responsibility to ensure this chain of documentation is complete and retained on file.
How Pat-Kruger helps with PDC crane system replacement
We work with crane owners and operators who are running legacy systems like the PDC and need a clear, compliant path forward. Whether the immediate need is a repair to extend the life of an existing installation, a full system replacement, or guidance on what options are available, we provide the technical expertise and hardware to get the crane back into safe, certified operation.
Our support for PDC crane system transitions includes:
- Site surveys to assess the existing PDC installation and identify the most practical replacement route
- Supply and installation of modern crane safety systems, including safe load indicators, load moment indicators, and rated capacity indicators
- Fabrication of custom force sensors, load pins, and load cells where the crane’s configuration requires bespoke components
- Full system calibration with documented calibration certificates
- ATEX-certified solutions for offshore and hazardous area applications
- PCB repair services for cases where partial repair of existing hardware is the preferred first step
- Remote monitoring and data logging integration for ongoing operational visibility
- Worldwide installation and commissioning support
If you are operating a crane with a PDC system and are unsure of your current support status or compliance position, contact our team to discuss your options and get a clear recommendation tailored to your crane and operating environment.
Frequently Asked Questions
How do I know if my crane is running a PDC system?
Check the display unit and control box on your crane for PDC branding or PAT group labelling. If you are unsure, a qualified crane safety engineer can identify the system during a site inspection by examining the hardware, wiring configuration, and any remaining documentation from the original installation. Maintenance records, previous inspection reports, and OEM commissioning paperwork are also useful sources if the physical labelling has worn or been removed.
Is it legal to continue operating a crane with a PDC system installed?
There is no blanket legal prohibition on operating a crane with a PDC system, but the legal obligation on the crane owner is to ensure the safety system is maintained in a safe and functional condition in accordance with applicable regulations. The challenge is that without manufacturer support, demonstrating compliance with that obligation becomes increasingly difficult. If an incident occurs and it is established that the safety system was unsupported and no remediation plan was in place, the legal exposure for the crane owner is significant.
What is the typical cost of replacing a PDC crane safety system?
Replacement costs vary considerably depending on the crane type, the complexity of the existing installation, whether sensors and wiring can be reused, and whether the operating environment requires ATEX-certified components. A straightforward swap-out on a standard mobile crane will cost significantly less than a bespoke engineered solution for an offshore pedestal crane. The most reliable way to get an accurate cost is to commission a site survey, which allows an engineer to specify the exact scope of work before any commitment is made.
How long does a PDC system replacement typically take, and how much downtime should I plan for?
For a standard replacement on a well-documented crane with reusable sensors and wiring, the physical installation and calibration can often be completed within one to three days. More complex installations, custom-engineered solutions, or cranes in remote and offshore locations may require longer planning lead times and extended on-site periods. The site survey stage is the best point at which to establish a realistic downtime estimate, as it identifies any complications before the crane is taken out of service.
Can I source spare PDC parts myself to keep the system running longer?
Third-party inventories of legacy PDC components do exist, and it is possible to source individual parts such as display units, sensors, or control boards through specialist suppliers. However, availability is finite and diminishing, and there is no guarantee that sourced parts will be in specification or compatible with your specific system variant. Any repair using third-party parts still needs to be carried out by a qualified engineer and verified through calibration, and it does not resolve the underlying compliance and certification challenges that come with running an unsupported system.
What documentation should I have on file for my crane's safety system, and what happens if I don't have it?
At a minimum, you should hold calibration certificates, the system specification or datasheet for the installed safety system, records of any repairs or modifications, and thorough examination reports from your inspection body. If documentation is incomplete or missing, it does not necessarily mean the crane cannot be inspected, but it places a greater burden on the competent person to assess the system from first principles, which can delay return to service and raise questions during an incident investigation. When a PDC system is replaced, the commissioning handover from the installing engineer is the opportunity to establish a complete and current documentation baseline.
What should I do if my PDC system fails unexpectedly and the crane needs to return to service quickly?
The first step is to take the crane out of service immediately and contact a crane safety specialist who has experience with legacy PDC systems. Depending on the failure mode, a rapid repair using available components may be possible as a short-term measure to restore operation while a full replacement is planned. The key is not to attempt to bypass or disable the safety system to keep the crane working, as this creates immediate safety and legal liability. Having a contingency plan and a relationship with a qualified service provider in place before a failure occurs is the most effective way to minimise unplanned downtime.