Compatibility checks belong before an excavator attachment is ordered, hired or sent to site.
An attachment can extend the work a machine can perform. It can also introduce a mismatch that is invisible in a short hire description or an online listing. “Fits a machine this size” is not enough information to make a safe purchasing decision.
The practical starting point is the specific machine, the specific attachment and the intended task. Treat the combination as a system that needs competent confirmation.
Give the supplier the whole brief
Provide the machine model and relevant configuration, the proposed attachment and a description of the work. Ask the supplier or manufacturer to confirm the applicable compatibility requirements, operating limits and instructions in writing.
Those requirements may involve more than physical connection. Capacity, hydraulic requirements, controls and the way the attachment changes the machine’s behaviour can all need assessment. This is work for competent people using the relevant manufacturer information, not an estimate based on appearance.
WorkSafe’s machinery guidance emphasises safe systems and competent decisions around machinery. For procurement, that means arranging the technical review before a purchase creates pressure to make an unsuitable combination work.
Include the handover in the price
Ask what comes with the attachment: instructions, inspection information, required accessories and operator familiarisation. Confirm who deals with a fault and how the unit will be taken out of service if it cannot be used safely.
For hired attachments, record the condition at collection and return through the agreed process. Make sure the site team receives the same instructions as the person who placed the order. Information left in an office inbox cannot help an operator who has never seen the equipment before.
The commercial comparison should include transport, setup, any permitted consumables and the time required to use the attachment correctly. A low daily rate can be poor value if the machine spends much of the booking waiting for the right fittings or support.
Keep the confirmed combination and its documents in the equipment record. If the carrier machine or attachment changes, reassess rather than carrying the old approval forward. A tidy record helps the next booking move faster without replacing the checks that make the combination suitable.