Attachments for the Caterpillar 304 weight range
- Bucket line
- GP - general purpose digging bucket300–1000 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 304
Each size below has a catalogue row rated for a carrier of 4,470 kg operating weight. Tell us which sizes you want and we reply with an offer.
On a narrow screen the table scrolls sideways.
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 304.
- Weight Class
- Mini Excavator (1–6 t)
- Operating Weight
- 4,470 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 Caterpillar, retrieved 2026-09-13. Source
Start here
The attachments buyers in your market ask for first, sized for the 304.
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 304.
Send this answer to a colleague or dealer
Caterpillar 304: GP - general purpose digging bucket (GP-60)
304 at a glance
| Figure | Value | Source |
|---|---|---|
| Max dig depth | 3,510 mm | maker's document (s7d2.scene7.com) |
| Max reach | 5,445 mm | maker's document (s7d2.scene7.com) |
| Max dump height | 3,740 mm | maker's document (s7d2.scene7.com) |
| Arm length | 1,395–1,695 mm | maker's document (s7d2.scene7.com) |
| Main pump flow | 96 l/min | maker's document (s7d2.scene7.com) |
| Auxiliary flow | 65 l/min | maker's document (s7d2.scene7.com) |
| Auxiliary pressure | 245 bar | maker's document (s7d2.scene7.com) |
| Lift capacity | 2,006 kg | maker's document (s7d2.scene7.com) |
| Quick coupler | Dual Lock Manual Coupler | maker's document (s7d2.scene7.com) |
| Transport width | 1,700 mm | maker's document (s7d2.scene7.com) |
Only figures the maker publishes for this model. Where a figure is missing, no value is shown.
What the 304 figures mean for its attachments
- Its auxiliary circuit is rated at 65 l/min and 245 bar. A breaker, auger, tilt rotator or other hydraulic tool states the oil flow it needs, so choose one whose range includes this figure.
- The main pump delivers up to 96 l/min at 245 bar. That is the pump output of the whole machine, not the flow an attachment gets.
- Caterpillar lists this quick coupler for it: Dual Lock Manual Coupler. The bracket on every attachment has to match the coupler.
- It digs down to 3,510 mm. That is the deepest trench it can open.
- Its maximum reach is 5,445 mm.
- It dumps at up to 3,740 mm, so a truck or skip side has to sit below that height.
- Caterpillar offers arms from 1,395 to 1,695 mm. A longer arm reaches further, a shorter one handles a heavier bucket.
- Caterpillar gives a lifting capacity of 2,006 kg. Check a heavy grab or hammer, plus its load, against the full load chart.
- For transport it measures 4,950 x 1,700 x 2,540 mm (length, width, height).
Figures as published by Caterpillar in its own documents.
How the 304 compares with its neighbours
The nearest models by weight, with the difference to the 304 in parentheses where both makers publish the figure.
| Model | Operating weight | Max dig depth | Main pump flow | Auxiliary flow |
|---|---|---|---|---|
| 304 | 4.47 t | 3,510 mm | 96 l/min | 65 l/min |
| Caterpillar 303.5 CR | 4.19 t (-0.28 t) | 3,110 mm (-400) | 100 l/min (+4) | 70 l/min (+5) |
| Caterpillar 303 CR | 3.54 t (-0.93 t) | 2,950 mm (-560) | 100 l/min (+4) | 65 l/min |
| Komatsu PC40 MRx | 4.44 t (-0.03 t) | 3,400 mm (-110) | not published | not published |
Figures as each maker publishes them. A difference is shown only where both machines have a published value.
304: build years and variants
Build years: 2022–2026
Variants
- 304 (2022–2026)
Years and variants as listed in the LECTURA Specs database.
304: what the brochure names
Features Caterpillar names in its own brochure for the 304. Some of them may be optional, so check the machine's spec before you order.
- Automatic engine idle when the controls are left alone.
- A dozer blade.
- A load-sensing hydraulic system.
- An engine that meets EU Stage V.
From Caterpillar's published brochure. We keep the source document on file.
Questions about the 304
- Which quick coupler is installed on your 304?
- Caterpillar lists this coupler for it: Dual Lock Manual Coupler. Order attachments with the matching bracket.
- Can the 304 run a hydraulic attachment?
- Yes, if the tool's rated range covers the auxiliary circuit: 65 l/min at 245 bar.
Each family shows its candidate models by operating-weight range.
Standard mini-ex buckets set No. 1
- GP - general purpose digging bucket
GP-60 · 6 width variants
- GB - rigid grading & ditching bucket, German profile
GB-60 · 4 width variants
- GBH - hydraulic tilt ditching bucket for mini-excavator
GBH-60 · 4 width variants
- RGP - skeleton rod GP bucket
RGP-60
- SGP - heavy duty skeleton GP bucket
SGP-60
- GPO - GP bucket with perforated bottom
GPO-60 · 3 width variants
Standard mini-ex buckets set No. 2
- GPL - general purpose digging bucket
GPL-60 · 6 width variants
- GBP - rigid grading & ditching bucket, Italian profile
GBP-60 · 4 width variants
- GBPH - hydraulic tilting grading & ditching bucket
GBPH-60 · 3 width variants
- RGPL - skeleton rod GPL bucket
RGPL-60 · 2 width variants
- GPLO - GPL bucket with perforated bottom
GPLO-60 · 3 width variants
- SGPL - heavy duty skeleton GPL bucket for mini-excavator
SGPL-60 · 2 width variants
Dutch mini-ex buckets set No. 3
- BDP mini - clay digging bucket for mini-excavator
BDP-50 · 2 width variants
- SB mini - Dutch profile grading & ditching bucket for mini-excavator
SB-60 · 5 width variants
- PDP mini - skeleton BDP stone bucket
PDP-60 · 3 width variants
Nordic mini-ex buckets set No. 4
- DS mini - Scandinavian deep digging bucket for mini-excavator
DS-50 · 3 width variants
- PS mini - Scandinavian universal grading bucket for mini-excavator
PS-60 · 3 width variants
- PSH mini - hydraulic swivelling grading bucket for mini-excavators
PS-60 · 3 width variants
- KS mini - cable bucket for mini-excavator
KS-50 · 3 width variants
- KSV mini - Scandinavian profile cable V bucket for mini-excavator
KSV-50 · 3 width variants
Other mini-ex attachments
- LR mini - straight land rakes for mini-excavator
LR-6 · 2 width variants
- LRS - short land rakes for mini-excavators
LRS-5
- RIP mini - ripper shank for mini-excavator
Ripper-5.5
- MR mini - multi-ripper for mini-excavator
MRF 75 · 2 width variants
- AC mini - asphalt cutter for mini-excavator
AC-6
- GRB light - mini-excavator grading beam with lowered mass
GRB-MIKRO · 3 width variants, GRBH-MIKRO · 3 width variants
Non-bucket attachments
- DuoRIP - double ripper for root extraction
Duo-Ripper-6
- GRB - excavator grading beam
GRB-MINI · 4 variants, GRBH-MINI · 2 width variants
Also available
- RC - root cutter
Root cutter-6
- RRB - root rake bucket profile
RRB-60
- QC-S - S-System Scandinavian quick-coupler
QC-S40-H, QC-S40-H/240, QC-S40-SA, QC-S40-SA/240, QC-U-S40-H, QC-U-S40-H/240
- CW - CW-System compatible quick-coupler
CW-10, CW-U-10
- QC-HS / QC-MS - MS-System compatible quick-coupler
QC-HS-03, QC-MS-03, QC-U-HS-03
- QC-PG - pin-grabber quick-coupler for factory brackets
QC-PG-40, QC-PG-45, QC-ML-M-40, QC-U-PG-40, QC-U-PG-45
Bucket sets for this machine
Sets of one bucket profile that include buckets listed for the Caterpillar 304. Each set lists the buckets that match the machine's operating weight.
- German-profile set
Buckets in the set for this weight: GP, GB, GBH
- Italian-profile set
Buckets in the set for this weight: GPL, GBP, GBPH
- Nordic-profile set
Buckets in the set for this weight: DS, PS, PSH, KS, KSV
- Dutch-profile set
Buckets in the set for this weight: BDP, SB, PDP
Before you order: check the interface
The weight class of the Caterpillar 304 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.
On a mini excavator the weight of the attachment counts for more than on a larger machine, because every kilogram of bucket is taken from lift capacity and stability. A narrow trenching bucket and a wide grading bucket are the usual pair, and many machines run a small quick coupler to change between them.
Quick coupler brackets at this weight
In our model tables, the attachments listed for the Caterpillar 304 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 Caterpillar models of a similar weight
Other makes of a similar weight
Operating weight within 2 t of the Caterpillar 304.
Other Caterpillar 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 Caterpillar 304.
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 Caterpillar 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.