Attachments for the Develon DX420LC-7K weight range
- Bucket line
- DB - heavy duty digging bucket1400–1800 mm wide
- We usually reply within 1 working day
- We check the fit before we send the quote
- Every offer names the dispatch week
- If a bracket we made is wrong and does not fit your machine, we replace it.
Catalogue sizes for the DX420LC-7K
Each size below has a catalogue row rated for a carrier of 43,500 kg operating weight. Tell us which sizes you want and we reply with an offer.
On a narrow screen the table scrolls sideways.
| Attachment | Sizes | Capacity [dm³] | Width [mm] | Weight [kg] |
|---|---|---|---|---|
| DB - heavy duty digging bucket | DB-500 · 4 width variants | 1,988–2,755 SAE | 1,400–1,800 | 1,515–1,829 |
| SDB - heavy duty skeleton DB bucket | SDB-500 · 2 width variants | 2,622–3,000 SAE | 1,800–2,000 | 1,995–2,172 |
| DBF - flat-top digging bucket for quick coupler | DBF-500 · 4 width variants | 1,897–2,611 SAE | 1,400–1,800 | 1,470–1,765 |
| RDBF - flat-top skeleton DBF bucket on rods | RDBF-500 · 3 width variants | 2,241–2,999 SAE | 1,600–2,000 | 1,511–1,755 |
| RIP - heavy duty ripper | Ripper-H | 684 | ||
| QC-S - S-System Scandinavian quick-coupler | QC-S90 | 750 | ||
| CW - CW-System compatible quick-coupler | CW-45, CW-45 S, CW-55, CW-U-45, CW-U-45 S | 435–1,146 |
Welded to EN ISO 3834-2. Agree it as a standing term of supply and the EN 10204 3.1 certificate ships with every attachment. You also get the CE declaration of conformity for every product that carries the CE mark.
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Sizes are matched to the published operating weight of the DX420LC-7K.
- Weight Class
- Heavy Excavator (30–65 t)
- Operating Weight
- 43,500 kg
- Family-owned group, founded in 1996
- More than 50,000 attachments delivered
- Built in our own factory in Poland
Operating weight as published by Develon, retrieved 2026-09-10. Source
Start here
The attachments buyers in your market ask for first, sized for the DX420LC-7K.
Which coupler is on your machine?
Pick the system on your machine and we put it in your enquiry. We check the bracket before we send the quote.
How to measure your coupler
Not sure which system it is? Three measurements tell us which bracket you need.
- Measure the diameter of both pins.
- Measure the distance between the pin centres.
- Measure the width between the inside faces of the ears.
If the coupler has a make or type printed on it, send that too.
Send me the spec sheet for my machine
Pick a bucket line and we email you its spec sheet, with the sizes we build for the DX420LC-7K.
Send this answer to a colleague or dealer
Develon DX420LC-7K: DBF - flat-top digging bucket for quick coupler (DBF-500)
DX420LC-7K at a glance
| Figure | Value | Source |
|---|---|---|
| Max dig depth | 8,335 mm | maker's website (eu.develon-ce.com) |
| Max reach | 11,910 mm | maker's document (eu.develon-ce.com) |
| Max dump height | 8,200 mm | maker's document (eu.develon-ce.com) |
| Arm length | 2,600–3,950 mm | maker's document (eu.develon-ce.com) |
| Main pump flow | 666 l/min | maker's document (eu.develon-ce.com) |
| Bucket capacity | 0.98–2.64 m³ | maker's document (eu.develon-ce.com) |
| Bucket width | 750–1,804 mm | maker's document (eu.develon-ce.com) |
| Lift capacity | 20,920 kg | maker's document (eu.develon-ce.com) |
| Quick coupler | Universal Pin-on Quick Coupler | maker's document (eu.develon-ce.com) |
| Transport width | 3,350 mm | maker's document (eu.develon-ce.com) |
Only figures the maker publishes for this model. Where a figure is missing, no value is shown.
What the DX420LC-7K figures mean for its attachments
- The main pump delivers up to 666 l/min at 363 bar. That is the pump output of the whole machine, not the flow an attachment gets.
- Develon lists this quick coupler for it: Universal Pin-on Quick Coupler. The bracket on every attachment has to match the coupler.
- It digs down to 8,335 mm. That is the deepest trench it can open.
- Its maximum reach is 11,910 mm.
- It dumps at up to 8,200 mm, so a truck or skip side has to sit below that height.
- Develon offers arms from 2,600 to 3,950 mm. A longer arm reaches further, a shorter one handles a heavier bucket.
- Develon lists buckets from 750 to 1,804 mm wide for this machine. Compare that with the bucket widths in the table above.Our sizes in that range: DB - heavy duty digging bucket (DB-500); SDB - heavy duty skeleton DB bucket (SDB-500); DBF - flat-top digging bucket for quick coupler (DBF-500); RDBF - flat-top skeleton DBF bucket on rods (RDBF-500)
- Develon lists bucket capacities from 0.98 to 2.64 m³.
- Develon gives a lifting capacity of 20,920 kg. Check a heavy grab or hammer, plus its load, against the full load chart.
- Its tail swing radius is 3,760 mm, which matters beside a wall or in a live traffic lane.
- For transport it measures 11,740 x 3,350 x 3,466 mm (length, width, height).
- Engine power is 257 kW.
Figures as published by Develon in its own documents.
How the DX420LC-7K compares with its neighbours
The nearest models by weight, with the difference to the DX420LC-7K in parentheses where both makers publish the figure.
| Model | Operating weight | Max dig depth | Main pump flow |
|---|---|---|---|
| DX420LC-7K | 43.5 t | 8,335 mm | 666 l/min |
| Develon DX380DM-7 | 44.8 t (+1.3 t) | 5,500 mm (-2,835) | 700 l/min (+34) |
| Develon DX400HD-9 | 41.7 t (-1.8 t) | 8,160 mm (-175) | 720 l/min (+54) |
| Caterpillar 340 Long Reach | 43.8 t (+0.3 t) | 13,050 mm (+4,715) | 560 l/min (-106) |
Figures as each maker publishes them. A difference is shown only where both machines have a published value.
DX420LC-7K: what the brochure names
Features Develon names in its own brochure for the DX420LC-7K. Some of them may be optional, so check the machine's spec before you order.
- Work modes you select from the cab.
- An engine that meets EU Stage V.
- Operator protection certified to ROPS and FOPS.
- Automatic engine idle when the controls are left alone.
From Develon's published brochure. We keep the source document on file.
Questions about the DX420LC-7K
- What bucket width fits the DX420LC-7K?
- Develon lists buckets from 750 to 1,804 mm wide for it. Pick a width in that range from the sizes above.
- Which quick coupler is installed on your DX420LC-7K?
- Develon lists this coupler for it: Universal Pin-on Quick Coupler. Order attachments with the matching bracket.
Each family shows its candidate models by operating-weight range.
Digging & sorting buckets
- DB - heavy duty digging bucket
DB-500 · 4 width variants
- SDB - heavy duty skeleton DB bucket
SDB-500 · 2 width variants
- DBF - flat-top digging bucket for quick coupler
DBF-500 · 4 width variants
- RDBF - flat-top skeleton DBF bucket on rods
RDBF-500 · 3 width variants
- QC-S - S-System Scandinavian quick-coupler
QC-S90
- CW - CW-System compatible quick-coupler
CW-45, CW-45 S, CW-55, CW-U-45, CW-U-45 S
Develon DX420LC-7K: machine data
- Operating weight
- 43,500 kg
- Engine power
- 257 kW
- Maximum digging depth
- 8,335 mm
- Maximum dump height
- 8,200 mm
- Tail swing radius
- 3,760 mm
- Quick coupler
- Universal Pin-on Quick Coupler
As published by Develon, retrieved 2026-09-17. Source
Before you order: check the interface
The weight class of the Develon DX420LC-7K sizes the attachment. It does not tell you the pin diameter, the pin spacing or the stick width, and those decide whether an attachment fits. Measure them on the machine, or send us the measurements of the bucket it runs today.
Heavy excavators dig rock, load trucks and work in quarries, so wear decides the bucket as much as capacity does. Rock and reinforced buckets carry thicker wear steel, teeth and side cutters, and the bucket is sized to the trucks it loads and to the density of the material.
Quick coupler brackets at this weight
In our model tables, the attachments listed for the Develon DX420LC-7K at its weight are built with these brackets. Each code opens the models that list it.
- Measure the diameter of both bucket pins.
- Measure the distance between the pin centres.
- Measure the inside width between the stick ears.
- If the machine runs a quick coupler, note its make and type.
What these terms mean:
How to choose an attachment for the job:
Other Develon models of a similar weight
Other makes of a similar weight
Operating weight within 2 t of the Develon DX420LC-7K.
Other Develon models with the same coupler brackets
Our model tables give these machines the same quick coupler brackets.
Why buy from the factory
- Cutting, machining, welding and painting on one site, our own factory in Poland, EU
- More than 50,000 attachments delivered since 2008
- A record for every serial number, so the spare parts match your attachment
Need Custom Specifications?
We can manufacture attachments to your exact pin spacing and requirements for Develon DX420LC-7K.
Welded to EN ISO 3834-2. Agree it as a standing term of supply and the EN 10204 3.1 certificate ships with every attachment. You also get the CE declaration of conformity for every product that carries the CE mark.
Do you sell Develon machines? Machine dealer supply
Machine makes and model names belong to their owners. Sieruta is not affiliated with them. We use the names only to show which machines we offer attachments for, by operating weight.