Attachments for the Caterpillar 303.5 CR weight range
Weight Class: Mini Excavator (1–6 t) Operating Weight: 4,190 kg
- Bucket line
- GP - general purpose digging bucket 300–1,000 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.
Ask for a price with this answer
The short version for the 303.5 CR
Families to look at first
- GP - general purpose digging bucket 300–1,000 mm
- GB - rigid grading & ditching bucket, German profile 1,200–1,600 mm
- GBH - hydraulic tilt ditching bucket for mini-excavator 1,200–1,600 mm
Quick coupler brackets at this weight
- S40
- MS03
- MS08
- CW05
- CW10
- OQ40
- OQ45
- HS03
- HS06
- Klac D
- Klac E
- Klac F
- M03
- M10
Brackets we build attachments with in this weight range. Not a confirmed fit.
Still to check
Pin diameter, pin spacing, inside width between the stick ears, and any quick coupler on the machine.
Catalogue sizes for the 303.5 CR
Each size below has a catalogue row rated for a carrier of 4,190 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 303.5 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-6 · 2 width variants | 1,000–1,200 | 158–187 | |
| 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 75 · 2 width variants | 800–1,000 | 117–121 | |
| 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-6 | 200 | 20 | |
| RRB - root rake bucket profile | RRB-60 | 1,500 | 222 | |
Quick couplers
Coupler sizes within this machine's published weight range. Not a confirmed fit.
| Attachment | Sizes | Heaped capacity ISO 7451 [dm³] | Width [mm] | Weight [kg] |
|---|---|---|---|---|
| QC-S - S-System Scandinavian quick-coupler Start here Price & lead time Get price & lead time S-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-coupler CW-System | CW-10, CW-U-10 | 65–179 | ||
| QC-HS / QC-MS - MS-System compatible quick-coupler MS system | QC-HS-03, QC-MS-03, QC-U-HS-03 | 30–90 | ||
| QC-PG - pin-grabber quick-coupler for factory brackets Pin-grabber | QC-PG-40, QC-PG-45, QC-ML-M-40, QC-U-PG-40, QC-U-PG-45 | 32–142 |
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 quick coupler and hydraulic attachment. See the certificates.
Message us on WhatsApp Photos and voice notes are welcome.Before you order: check the interface
The weight class of the Caterpillar 303.5 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 303.5 CR at its weight are built with these brackets. Each code opens the models that list it.
Brackets we build attachments with in this weight range. Not a confirmed fit.
- 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 303.5 CR.
Send this answer to a colleague or dealer
Caterpillar 303.5 CR: GP - general purpose digging bucket (GP-60). Shortlisted by operating weight
Sizes are matched to the published operating weight of the 303.5 CR.
- Weight Class
- Mini Excavator (1–6 t)
- Operating Weight
- 4,190 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 303.5 CR: machine data
- Max dig depth
- 3,110 mm maker's document via s7d2.scene7.com
- Max reach
- 5,380 mm maker's document via s7d2.scene7.com
- Max dump height
- 3,600 mm maker's document via s7d2.scene7.com
- Arm length
- 1,260–1,560 mm maker's document via s7d2.scene7.com
- Main pump flow
- 100 l/min maker's document via s7d2.scene7.com
- Auxiliary flow
- 70 l/min maker's document via s7d2.scene7.com
- Auxiliary pressure
- 245 bar maker's document via s7d2.scene7.com
- Lift capacity
- 1,676 kg maker's document via s7d2.scene7.com
- Quick coupler
- Dual Lock Manual Coupler maker's document via s7d2.scene7.com
- Transport width
- 1,780 mm maker's document via s7d2.scene7.com
- Pin diameter
- 40 mm Source: Tuff Buckets. From a dealer's table. It does not say which arm or quick coupler was fitted.
A guide only. Measure the pins before you order.
What the 303.5 CR figures mean for its attachments
- Its auxiliary circuit is rated at 70 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 3,110 mm. That is the deepest trench it can open.
- Its maximum reach is 5,380 mm.
- It dumps at up to 3,600 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 33 kN. That is the force a bucket or ripper works with at the tooth.
- Caterpillar gives a lifting capacity of 1,676 kg. Check a heavy grab or hammer, plus its load, against the full load chart.
- For transport it measures 4,800 x 1,780 x 2,480 mm (length, width, height).
Figures as published by Caterpillar in its own documents.
How the 303.5 CR compares with its neighbours
The nearest models by weight, with the difference to the 303.5 CR in parentheses where both makers publish the figure.
| Model | Operating weight | Max dig depth | Main pump flow | Auxiliary flow |
|---|---|---|---|---|
| 303.5 CR | 4.19 t | 3,110 mm | 100 l/min | 70 l/min |
| Caterpillar 304 | 4.47 t (+0.28 t) | 3,510 mm (+400) | 96 l/min (-4) | 65 l/min (-5) |
| Caterpillar 303 CR | 3.54 t (-0.65 t) | 2,950 mm (-160) | 100 l/min | 65 l/min (-5) |
| XCMG XE35E (Cab) | 4.2 t (+0.01 t) | 3,264 mm (+154) | 108 l/min (+8) | 40 l/min (-30) |
Figures as each maker publishes them. A difference is shown only where both machines have a published value.
303.5 CR: what the brochure names
Features Caterpillar names in its own brochure for the 303.5 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 303.5 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 303.5 CR.
Questions about the 303.5 CR
- Which quick coupler is installed on your 303.5 CR?
- Caterpillar lists this coupler for it: Dual Lock Manual Coupler. Order attachments with the matching bracket.
- Can the 303.5 CR run a hydraulic attachment?
- Yes, if the tool's rated range covers the auxiliary circuit: 70 l/min at 245 bar.
For publishers: cite or embed this table
Cite this table as https://sieruta.com/en/fit/caterpillar/caterpillar-303-5-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.