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Operating-weight guide

Attachments for the Caterpillar 303 CR weight range

Bucket line
GP - general purpose digging bucket300–800 mm wide
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  • If a bracket we made is wrong and does not fit your machine, we replace it.

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.

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AttachmentSizesCapacity [dm³]Width [mm]Weight [kg]
GP - general purpose digging bucketGP-40 · 5 width variants46–159 SAE300–80047–93
GB - rigid grading & ditching bucket, German profileGB-40 · 3 width variants124–176 SAE1,000–1,40081–107
GBH - hydraulic tilt ditching bucket for mini-excavatorGBH-40 · 4 width variants124–190 SAE1,000–1,500128–162
RGP - skeleton rod GP bucketRGP-40 · 2 width variants157–206 SAE800–1,00095–116
SGP - heavy duty skeleton GP bucketSGP-40 · 2 width variants106–128 SAE800–1,000105–129
GPO - GP bucket with perforated bottomGPO-40 · 3 width variants85–128 SAE600–1,00070–99
GPL - general purpose digging bucketGPL-40 · 5 width variants43–145 SAE300–80035–71
GBP - rigid grading & ditching bucket, Italian profileGBP-40 · 3 width variants129–187 SAE1,000–1,40072–98
GBPH - hydraulic tilting grading & ditching bucketGBPH-40 · 3 width variants158–201 SAE1,200–1,500147–167
RGPL - skeleton rod GPL bucketRGPL-40 · 2 width variants145–186 SAE800–1,00066–81
GPLO - GPL bucket with perforated bottomGPLO-40 · 2 width variants103–145 SAE600–80056–71
SGPL - heavy duty skeleton GPL bucket for mini-excavatorSGPL-40 · 2 width variants145–186 SAE800–1,00073–87
BDP mini - clay digging bucket for mini-excavatorBDP-40 · 2 width variants27–40 SAE300–40050–60
SB mini - Dutch profile grading & ditching bucket for mini-excavatorSB-40 · 3 width variants149–184 SAE1,000–1,20093–109
PDP mini - skeleton BDP stone bucketPDP-40 · 4 width variants129–232 SAE600–1,00075–107
DS mini - Scandinavian deep digging bucket for mini-excavatorDS-50 · 3 width variants75–132 SAE400–60057–75
PS mini - Scandinavian universal grading bucket for mini-excavatorPS-60 · 3 width variants209–254 SAE1,200–1,400107–130
PSH mini - hydraulic swivelling grading bucket for mini-excavatorsPS-60 · 3 width variants1,200–1,400
KS mini - cable bucket for mini-excavatorKS-50 · 3 width variants53–107 SAE300–50048–65
KSV mini - Scandinavian profile cable V bucket for mini-excavatorKSV-50 · 3 width variants22–71 SAE100–30034–40
CB mini - hydraulic clamp bucket for mini-excavatorCBR-40113 SAE600107
GKB mini - deep cable digging bucket for mini-excavatorGKB-6015047
RGPR - skeleton rod bucketRGPR-40157 SAE1,00094
RGB - skeleton rod grading & sorting bucketRGB-40200 SAE1,400108
LR mini - straight land rakes for mini-excavatorLR-4 · 2 width variants1,000–1,200127–150
LRS - short land rakes for mini-excavatorsLRS-51,560130
RIP mini - ripper shank for mini-excavatorRipper-5.551
MR mini - multi-ripper for mini-excavatorMRF 40 · 2 width variants600–80062–69
AC mini - asphalt cutter for mini-excavatorAC-643
GRB light - mini-excavator grading beam with lowered massGRB-MIKRO · 3 width variants, GRBH-MIKRO · 3 width variants1,500–2,00086–141
DuoRIP - double ripper for root extractionDuo-Ripper-6365102
GRB - excavator grading beamGRB-MINI · 4 variants, GRBH-MINI · 2 width variants1,000–1,50091–261
RC - root cutterRoot cutter-217013
RRB - root rake bucket profileRRB-401,200148
QC-S - S-System Scandinavian quick-couplerQC-S40-H, QC-S40-H/240, QC-S40-SA, QC-S40-SA/240, QC-U-S40-H, QC-U-S40-H/24030–92
CW - CW-System compatible quick-couplerCW-10, CW-U-1065–179
QC-HS / QC-MS - MS-System compatible quick-couplerQC-HS-03, QC-MS-03, QC-U-HS-0330–90
QC-PG - pin-grabber quick-coupler for factory bracketsQC-ML-M-4032
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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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Cite this table as https://sieruta.com/en/fit/caterpillar/caterpillar-303-cr, figures as of 2026-09-13.

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Caterpillar 303
Caterpillar 303Photo: Artaxerxes, CC BY-SA 4.0, via Wikimedia Commons

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

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
213

Not sure which system it is? Three measurements tell us which bracket you need.

  1. Measure the diameter of both pins.
  2. Measure the distance between the pin centres.
  3. 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 303 CR.

Machine

Caterpillar 303 CR

We usually reply within 1 working day.

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Machine, line and sizes

Caterpillar 303 CR: GP - general purpose digging bucket (GP-40)

303 CR at a glance

FigureValueSource
Max dig depth2,950 mmmaker's document (s7d2.scene7.com)
Max reach5,110 mmmaker's document (s7d2.scene7.com)
Max dump height3,310 mmmaker's document (s7d2.scene7.com)
Arm length1,260–1,560 mmmaker's document (s7d2.scene7.com)
Main pump flow100 l/minmaker's document (s7d2.scene7.com)
Auxiliary flow65 l/minmaker's document (s7d2.scene7.com)
Auxiliary pressure245 barmaker's document (s7d2.scene7.com)
Lift capacity1,280 kgmaker's document (s7d2.scene7.com)
Quick couplerDual Lock Manual Couplermaker's document (s7d2.scene7.com)
Transport width1,550 mmmaker's document (s7d2.scene7.com)

Only figures the maker publishes for this model. Where a figure is missing, no value is shown.

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.
  • 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.

ModelOperating weightMax dig depthMain pump flowAuxiliary flow
303 CR3.54 t2,950 mm100 l/min65 l/min
Caterpillar 302.7 CR3.05 t (-0.49 t)2,650 mm (-300)100 l/min65 l/min
Caterpillar 303.5 CR4.19 t (+0.65 t)3,110 mm (+160)100 l/min70 l/min (+5)
Hyundai R35Z-9A3.55 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.

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.

Each family shows its candidate models by operating-weight range.

Bucket sets for this machine

Sets of one bucket profile that include buckets listed for the Caterpillar 303 CR. Each set lists the buckets that match the machine's operating weight.

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.

  1. Measure the diameter of both bucket pins.
  2. Measure the distance between the pin centres.
  3. Measure the inside width between the stick ears.
  4. 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 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.

Get a price Custom Engineering

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.

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