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A hydraulic quick coupler is a device fitted to an excavator or other piece of earth-moving machinery, allowing the operator to connect and change attachments from the safety and security of the cab using the machine’s hydraulic system. This technology enables one excavator to work with a wide range of attachments at minimal cost to efficiency.
Hydraulic quick couplers are commonly used with attachments such as digging buckets, grading buckets, breakers, and other specialist handling equipment. By allowing attachments to be changed more efficiently, they can help improve machine versatility, reduce downtime and increase productivity on site.
An excavator quick coupler, or quick hitch, allows operators to change buckets and other excavator attachments quickly and efficiently, without the need to manually remove and replace the attachment pins.
The quick coupler is fitted to the end of the excavator arm and connects to the attachment by engaging with its pins. The coupler hooks onto one pin before a locking mechanism secures the second. With a hydraulic quick coupler, this locking mechanism is operated hydraulically from the excavator cab, allowing compatible attachments to be connected and released quickly and safely.
Quick couplers help reduce attachment changeover times, minimise downtime and increase excavator productivity and versatility on site. As the pioneer of quick coupler technology, Miller continues to design and manufacture couplers with safety, reliability, and productivity at their core.
As the original innovator of the fully automatic, universal pin grabber quick coupler, Miller remain at the forefront of both innovation and safety. Our couplers are developed for demanding earth-moving applications, with a focus on versatility, durability and productivity.
Customers can explore the Miller hydraulic quick-coupler range or visit our technical downloads for model-specific specifications, operating instructions, compatibility information and compliance documentation.
A hydraulic quick coupler must be correctly matched to the excavator and attachment, properly installed and operated in accordance with the manufacturer’s instructions.
Miller couplers are engineered with ISO 13031 compliant independent locking features intended to keep the attachment securely connected, including in the event of hydraulic pressure loss. Safe operation also depends on correct operator training, regular inspection, appropriate maintenance and confirmation that the attachment is securely engaged before use.
Read more about ISO 13031 and Miller's Twin Locking Technology below.
ISO 13031 is an international safety standard for quick couplers used on earth-moving machinery, including excavators. The current reference is ISO 13031:2016, together with Amendment 1:2025.
The standard sets out safety requirements intended to reduce the risk of an attachment being unintentionally released from a quick coupler. It covers areas including coupler design, locking and safety systems, operator information, functional checks, and testing.
Miller has built a strong industry reputation for quick-coupler safety through engineering innovation, rigorous testing, and product designs developed to meet recognised standards such as ISO 13031. Our quick couplers incorporate independent locking features designed to keep the attachment securely connected, including in the event of hydraulic pressure loss. The GT Series is designed to ensure the widest set of OEM pin pickups can be safety attached from the security of the cab.
Our couplers’ advanced safety features have been cycle-tested beyond their expected working life. This includes fatigue testing of the frame over more than 100,000 cycles at loads exceeding those generated by the excavator, helping to demonstrate durability and reliability under demanding operating conditions.
Miller products are designed and tested with all applicable safety requirements in mind, including ISO 13031. Product-specific compliance depends on the coupler model, machine configuration and the requirements of the market in which it is used.
Customers can explore our product pages and downloads section for model-specific technical information, ISO 13031 compliance documentation, operating instructions and safety guidance.
