Category
Quick couplers
4 families in Quick couplers.
What this category is for
A quick coupler sits between the stick and the attachment, so it decides how fast an operator changes from a digging bucket to a grading bucket and how firmly that attachment is held while the machine works. Sieruta builds couplers in Ostrołęka, Poland, for the interfaces a European contractor actually meets: the Scandinavian S standard, the CW system common in the Netherlands and Belgium, the cast MS and SY systems, and pin grabbers that pick up the excavator maker's own brackets. Each system comes in three operating types: fully hydraulic automatic, mechanical by wrench, and hydraulic tilt and swivel with two times 90 degrees of movement. Sizes run from carriers under 1 t up to 45 t machines. Choose the system your attachments already carry, then the size band for the carrier, then the operating type for how often you swap during a shift.
4 of 4 product families
Quick couplers
QC-S - S-System Scandinavian quick-coupler
S-System reversible Scandinavian quick-couplers built to the Nordic S standard, in fully hydraulic automatic, mechanically operated semi-automatic and hydraulic tilt/swivel versions.
On requestView product
CW - CW-System compatible quick-coupler
Quick-couplers compatible with CW system brackets, in manual, fully automatic and tilt/swivel versions.
On requestView product
QC-HS / QC-MS - MS-System compatible quick-coupler
Cast steel quick-couplers compatible with MS / SY system brackets, CNC machined for a fit that stays tight after many hours of use.
On requestView product
QC-PG - pin-grabber quick-coupler for factory brackets
Pin-grabber quick-coupler using factory brackets: it picks up the excavator manufacturer’s own bracket, and the variable pin-centre models let one coupler take many different OEM attachments.
On requestView product
How to choose
- 1
Start from the brackets you already own
The coupler has to match the brackets welded on your buckets, not the other way round. Read the system name off one bucket bracket, or send us a photo and the pin dimensions, and we will tell you which family fits before anything is ordered.
- 2
Match the size to the carrier weight
Every coupler family runs in size steps, and each step names the excavator weight band it was drawn for. A coupler one size small is the part that fails first under load, and one size large adds mass and length you carry all day for nothing.
- 3
Decide mechanical, automatic or tilt and swivel
A mechanical coupler is opened with a wrench and costs least; a fully hydraulic one is opened from the cab and pays back on sites where you change attachment several times an hour; a tilt and swivel version angles the attachment hydraulically and replaces a separate tiltrotator on lighter work.
- 4
Check what the machine can feed
A hydraulic coupler needs a spare double acting line and a control in the cab, and a tilt and swivel version needs a second one. If the carrier has only one auxiliary circuit, say so on the quote form and we will propose the version it can run.
- 5
Read the safety features, not just the price
Our hydraulic couplers carry a front mechanical hook, a rear mechanical lock, a pilot operated check valve as a third hydraulic lock and a visual indicator the operator can see from the cab. Compare those four points across offers, because they are what keeps an attachment on the machine.
Questions we are asked
- Which coupler system should I order?
- Order the one your attachments already use. S system is the Nordic standard, CW is widespread in the Netherlands and Belgium, MS and SY are common in central Europe, and a pin grabber takes the excavator maker's own brackets.
- Can I keep my existing buckets?
- Usually yes. If the buckets carry brackets of the same system and size, they go straight on. If they are direct fit on pins, a pin grabber coupler takes them, or we can fit new brackets to them.
- What does a coupler change on the machine?
- It adds length between the stick and the attachment and it adds mass, so breakout force and lifting capacity drop a little. The dimensions and the mass of every model are printed in the table on each family page.
- Do I need extra hydraulic lines for a tilt and swivel coupler?
- Yes. A tilt and swivel coupler needs its own hydraulic supply beside the line that locks the coupler, so the carrier needs two auxiliary circuits or a valve block that splits one.
- Can one coupler take attachments from different makes?
- A pin grabber with variable pin centres takes several different original brackets, which is the usual answer for a mixed fleet. Tell us the makes and models you run and we will confirm the sizes before you order.
Who builds these
- Designed and built in Ostrołęka, Poland, in our own plant.
- 12 months of warranty on every attachment.
- Scheduled for certification to ISO 9001, ISO 14001 and ISO 45001 with UDT: one integrated management system for the whole company.
Quick couplers, photographed in the works
Photographs taken in our own yard and workshop.
A large hydraulic coupler on a pallet in the workshop.
A coupler with both locking pins and their red indicators visible.
The same coupler seen from the machine side.
A coupler photographed from three-quarters, showing both pin bores.
A coupler resting on a timber block before packing.
The hydraulic ram and locking bar on the underside of a coupler.
A coupler seen from above on pallet timbers.
A coupler mounted on a machine, with the safety clips in place.