Attachments for the Caterpillar 303 CR weight range
- Bucket line
- GP - general purpose digging bucket300–800 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.
How is the attachment mounted on this machine?
Tell us what is on the machine now. It narrows the sizes we show and goes with your enquiry. It does not confirm fit: we check the bracket before we send the quote.
Catalogue sizes for the 303 CR
Each size below has a catalogue row rated for a carrier of 3,540 kg operating weight. Tell us which sizes you want and we reply with an offer.
Each family shows its candidate models by operating-weight range.
The attachments buyers in your market ask for first, sized for the 303 CR.
On a narrow screen the table scrolls sideways.
Buckets
Tools
| Attachment | Sizes | Heaped capacity ISO 7451 [dm³] | Width [mm] | Weight [kg] |
|---|---|---|---|---|
Other mini-ex attachments | ||||
| LR mini - straight land rakes for mini-excavator | LR-4 · 2 width variants | 1,000–1,200 | 127–150 | |
| LRS - short land rakes for mini-excavators | LRS-5 | 1,560 | 130 | |
| RIP mini - ripper shank for mini-excavator | Ripper-5.5 | 51 | ||
| MR mini - multi-ripper for mini-excavator | MRF 40 · 2 width variants | 600–800 | 62–69 | |
| AC mini - asphalt cutter for mini-excavator | AC-6 | 43 | ||
| GRB light - mini-excavator grading beam with lowered mass | GRB-MIKRO · 3 width variants, GRBH-MIKRO · 3 width variants | 1,500–2,000 | 86–141 | |
Non-bucket attachments | ||||
| DuoRIP - double ripper for root extraction | Duo-Ripper-6 | 365 | 102 | |
| GRB - excavator grading beam | GRB-MINI · 4 variants, GRBH-MINI · 2 width variants | 1,000–1,500 | 91–261 | |
Also available | ||||
| RC - root cutter | Root cutter-2 | 170 | 13 | |
| RRB - root rake bucket profile | RRB-40 | 1,200 | 148 | |
Quick couplers
| Attachment | Sizes | Heaped capacity ISO 7451 [dm³] | Width [mm] | Weight [kg] |
|---|---|---|---|---|
| QC-S - S-System Scandinavian quick-couplerStart herePrice & lead timeGet price & lead timeS-System (Scandinavian) | QC-S40-H, QC-S40-H/240, QC-S40-SA, QC-S40-SA/240, QC-U-S40-H, QC-U-S40-H/240 | 30–92 | ||
| CW - CW-System compatible quick-couplerCW-System | CW-10, CW-U-10 | 65–179 | ||
| QC-HS / QC-MS - MS-System compatible quick-couplerMS system | QC-HS-03, QC-MS-03, QC-U-HS-03 | 30–90 | ||
| QC-PG - pin-grabber quick-coupler for factory bracketsPin-grabber | QC-ML-M-40 | 32 |
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 attachment. See the certificates.
Message us on WhatsAppPhotos and voice notes are welcome.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.
Before you order: check the interface
The weight class of the Caterpillar 303 CR 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 303 CR 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:
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 303 CR.
Send this answer to a colleague or dealer
Caterpillar 303 CR: GP - general purpose digging bucket (GP-40)
Sizes are matched to the published operating weight of the 303 CR.
- Weight Class
- Mini Excavator (1–6 t)
- Operating Weight
- 3,540 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
Caterpillar 303 CR: machine data
- Max dig depth
- 2,950 mmmaker's document via s7d2.scene7.com
- Max reach
- 5,110 mmmaker's document via s7d2.scene7.com
- Max dump height
- 3,310 mmmaker's document via s7d2.scene7.com
- Arm length
- 1,260–1,560 mmmaker's document via s7d2.scene7.com
- Main pump flow
- 100 l/minmaker's document via s7d2.scene7.com
- Auxiliary flow
- 65 l/minmaker's document via s7d2.scene7.com
- Auxiliary pressure
- 245 barmaker's document via s7d2.scene7.com
- Lift capacity
- 1,280 kgmaker's document via s7d2.scene7.com
- Quick coupler
- Dual Lock Manual Couplermaker's document via s7d2.scene7.com
- Transport width
- 1,550 mmmaker's document via s7d2.scene7.com
- Pin diameter
- 40 mmSource: Tuff Buckets.
A guide only. Measure the pins before you order.
What the 303 CR 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 100 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 2,950 mm. That is the deepest trench it can open.
- Its maximum reach is 5,110 mm.
- It dumps at up to 3,310 mm, so a truck or skip side has to sit below that height.
- Caterpillar offers arms from 1,260 to 1,560 mm. A longer arm reaches further, a shorter one handles a heavier bucket.
- Bucket breakout force is 28.4 kN and arm crowd force 16.6 kN. That is the force a bucket or ripper works with at the tooth.
- Caterpillar gives a lifting capacity of 1,280 kg. Check a heavy grab or hammer, plus its load, against the full load chart.
- For transport it measures 4,510 x 1,550 x 2,480 mm (length, width, height).
Figures as published by Caterpillar in its own documents.
How the 303 CR compares with its neighbours
The nearest models by weight, with the difference to the 303 CR in parentheses where both makers publish the figure.
| Model | Operating weight | Max dig depth | Main pump flow | Auxiliary flow |
|---|---|---|---|---|
| 303 CR | 3.54 t | 2,950 mm | 100 l/min | 65 l/min |
| Caterpillar 302.7 CR | 3.05 t (-0.49 t) | 2,650 mm (-300) | 100 l/min | 65 l/min |
| Caterpillar 303.5 CR | 4.19 t (+0.65 t) | 3,110 mm (+160) | 100 l/min | 70 l/min (+5) |
| Hyundai R35Z-9A | 3.55 t (+0.01 t) | 3,135 mm (+185) | 74.8 l/min (-25.2) | not published |
Figures as each maker publishes them. A difference is shown only where both machines have a published value.
303 CR: what the brochure names
Features Caterpillar names in its own brochure for the 303 CR. 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.
Other Caterpillar models of a similar weight
Other makes of a similar weight
Operating weight within 2 t of the Caterpillar 303 CR.
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 303 CR.
Questions about the 303 CR
- Which quick coupler is installed on your 303 CR?
- Caterpillar lists this coupler for it: Dual Lock Manual Coupler. Order attachments with the matching bracket.
- Can the 303 CR run a hydraulic attachment?
- Yes, if the tool's rated range covers the auxiliary circuit: 65 l/min at 245 bar.
For publishers: cite or embed this table
Cite this table as https://sieruta.com/en/fit/caterpillar/caterpillar-303-cr, figures as of 2026-09-13.
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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.