Hydraulic breaker for Cat mini excavators: which Promove model fits?

Cat mini excavators from the 301.8 to the 305 CR are common machines for demolition, trenching and road construction work, and many of them run a hydraulic breaker. Three Promove breakers cover the Cat models in this guide: the XP151, the XP200 and the XP300. Together their carrier classes span 1.8–9 t. Which one fits depends on the operating weight of your Cat and on what its auxiliary circuit delivers.

This guide gives a fit table by Cat model, the datasheet values of the three breakers side by side, and the checks we run before we confirm fit in a written quote. The table is a starting point, not a final answer: the data plate of your machine and its hammer circuit decide.

Cat models and the Promove breaker to check first

The weights below are the maximum operating weights Cat publishes for each model, rounded. A canopy, a shorter stick or a lighter bucket brings the value down, while an extra counterweight or a quick coupler adds to it, so always compare them with the data plate of your own machine.

Cat model	Max. operating weight	Promove model to check first
Cat 301.8	2.03 t	Promove XP151
Cat 302 CR	2.26 t	Promove XP151
Cat 302.7 CR	3.05 t	Promove XP151 / Promove XP200
Cat 303 CR	3.55 t	Promove XP151 / Promove XP200
Cat 303.5 CR	4.19 t	Promove XP200
Cat 304	4.48 t	Promove XP200 / Promove XP300
Cat 305 CR	5.76 t	Promove XP300

Where two models are listed, the machine sits in a zone where both breakers are in class, and the auxiliary circuit decides. Cat models that are not in this table can be checked the same way: find the operating weight, then compare it with the carrier classes below.

XP151, XP200 and XP300 side by side

All values below come from the Promove datasheets shown on our product pages.

The XP200 and the XP300 share the same 330 × 330 mm cover plate, while the XP151 is the lightest of the three and has its own 275 × 275 mm plate. The XP300 carries the largest tool of the three, 80 mm, against 64 mm on the XP200 and 52 mm on the XP151.

First check: the operating weight of your excavator

Cat names its mini excavators by size class, but the model number is not the operating weight. A 302.7 CR with a canopy is lighter than the same machine with a cab, and an extra counterweight or a heavier bucket changes the value again. Because our table shows the heaviest configuration, your own machine may sit lower in the class. Take the operating weight from the data plate or the manual and check it against the carrier class and the optimal range of each breaker in the tables above. If your machine is close to the edge of a carrier class, tell us, and we check stability and reach with you before we confirm fit.

Second check: auxiliary oil flow and pressure

A breaker only works as intended if the auxiliary circuit delivers the flow and pressure it was designed for. The XP151 needs 25–35 l/min at 110–130 bar, the XP200 needs 40–60 l/min at 100–110 bar and the XP300 needs 50–60 l/min at 110–130 bar. On Cat machines where the auxiliary flow can be adjusted, the setting for the hammer circuit has to match the breaker, not the maximum the machine can deliver.

You find the auxiliary circuit data in the excavator manual, or your machine dealer can tell you. If the manual lists several modes, use the values for the hammer circuit. Too little flow makes the breaker slow, while too much flow or pressure overloads it and shortens its service life.

Third check: relief valve and return line

The relief valve of the breaker circuit on the excavator is set to 180 bar for the XP151, 160 bar for the XP200 and 180 bar for the XP300. All three breakers allow a maximum back pressure of 25 bar in the return line. If your Cat has no direct return line to the tank, the back pressure can be too high; we check this with you before we confirm fit.

Mounting: cover plate, coupler and adapter plate

Each breaker comes with a bolt-on cover plate: 275 × 275 mm, 15 mm thick on the XP151, and 330 × 330 mm, 15 mm thick on the XP200 and the XP300. All three are supplied with hydraulic hoses and a moil (conical) point.

Cat mini excavators run either a quick coupler or a pin-on mount. The breaker then needs a top bracket or adapter plate that matches your coupler type or your pin dimensions. This part is not included as standard; whether and how it is supplied is confirmed in the written quote.

Where two Promove models overlap

The 301.8 (2.03 t) and the 302 CR (2.26 t) are inside the XP151 carrier class of 1.8–4 t and below the XP200 carrier class of 2.5–5.2 t, so the XP151 is the model to check. The 302.7 CR (3.05 t) and the 303 CR (3.55 t) are inside the XP151 optimal range of 2.2–3.6 t and also inside the XP200 optimal range of 3–4.5 t. Here the hammer circuit decides: if it delivers 25–35 l/min, the XP151 is the match; if it delivers 40–60 l/min, look at the XP200.

The 303.5 CR (4.19 t) is above the XP151 carrier class and inside the XP200 optimal range, which makes the XP200 the model to check first. The 304 (4.48 t) is still inside the XP200 optimal range and inside the XP300 carrier class of 4–9 t, just below its optimal range of 4.5–8 t, so both are worth checking against your hammer circuit. The 305 CR (5.76 t) is above the XP200 carrier class and inside the XP300 optimal range, so here the XP300 is the model to check first.

What to send us for a fit check

Send these details with your enquiry, and we check them against the datasheet:

• excavator make, model and operating weight,
• quick coupler type or pin dimensions,
• flow and pressure of the auxiliary hydraulic circuit,
• relief valve setting, and whether the return line goes directly to the tank,
• your company name and VAT number.

Running a larger Cat, such as a midi excavator, or a machine from another brand? Send us the model and the operating weight, and we check it against the same datasheets.

How ordering works (B2B only)

Thunderline is an Authorised Promove dealer. We sell to business customers with a valid VAT number issued in the country of delivery, verified in VIES. You receive a written quote for the breaker and any bracket or adapter plate, with the freight to your site shown as a separate line. Payment is only due after we have checked your VAT number, confirmed fit and you have accepted the quote.

Warranty: 12-month warranty from the date of delivery, claims handled through Thunderline.

Ready to choose? See the Promove XP151, the Promove XP200 or the Promove XP300, or request a written quote with your Cat model and machine details. Quote within 2 hours.

CE marked – manufacturer's Certificate of Conformity (CoC) supplied with the machine on delivery.

Cat, Caterpillar and the Cat model names are trademarks of their owner. They are used here only to describe the machines we check against the Promove datasheets.