How to Read a Crusher Spec Sheet: Understanding the Numbers That Matter

Spec Sheets Can Be Misleading — Here's What Actually Matters

Every crusher manufacturer publishes spec sheets with impressive numbers. But comparing specs across brands isn't always apples-to-apples. Some manufacturers test at ideal conditions, others at realistic conditions. Here's how to read through the marketing and understand what the numbers actually mean for your production.

Feed Opening (Jaw Size)

What it says: "42 x 30 inch jaw opening"

What it means: The physical gap at the top of the crushing chamber is 42 inches wide and 30 inches deep. This is the maximum size of material that can enter the crusher.

What to know: The practical feed size is about 80% of the stated opening. A 42" wide opening can accept material up to about 34" wide in practice — you need clearance for the material to fall into the chamber without bridging.

Capacity (TPH)

What it says: "200 – 400 TPH"

What it means: The crusher can process between 200 and 400 tons per hour depending on conditions.

What to know: The high end of the range assumes ideal conditions — perfectly sized feed, clean material, and the widest CSS setting. Real-world production is typically 60-80% of the maximum stated capacity. If a spec sheet says 400 TPH max, budget for 240-320 TPH in your production planning.

Key variables: Harder rock reduces throughput. Wetter material reduces throughput. Tighter CSS reduces throughput. Recycled concrete with rebar reduces throughput.

CSS Range (Closed Side Setting)

What it says: "CSS range: 1.5" – 6""

What it means: The minimum gap between crushing surfaces can be adjusted from 1.5 inches to 6 inches. This controls the maximum product size.

What to know: Running at the minimum CSS dramatically reduces throughput and increases wear. A crusher rated at 300 TPH at 4" CSS may only produce 150 TPH at 1.5" CSS. Always ask: "What is the rated capacity at MY target CSS?" — not just the maximum capacity at the widest setting.

Engine Horsepower

What it says: "CAT C9.3B, 330 HP"

What it means: The diesel engine produces 330 horsepower at rated RPM.

What to know: More HP doesn't always mean more production. A jaw crusher is limited by its jaw opening and CSS, not just engine power. Excess horsepower is useful for maintaining throughput on hard, abrasive material. But a 330 HP crusher processing limestone won't produce more than a 275 HP crusher of the same jaw size — the limestone simply doesn't require the extra power.

Operating Weight

What it says: "Operating weight: 105,000 lbs"

What it means: The total weight of the machine with all fluids and standard equipment.

What to know: Weight matters for transport. Over 80,000 lbs requires overweight permits in most states. Over 105,000 lbs may require escort vehicles. Budget $3,000-$10,000 per move for heavy equipment transport. Also: heavier frames generally mean less vibration and longer bearing life.

Reduction Ratio

What it says: "Reduction ratio: 6:1"

What it means: The crusher reduces material by a factor of 6. Feed a 24" rock and get 4" product.

What to know: Jaw crushers typically have 4:1 to 6:1 ratios. Cone crushers: 4:1 to 8:1. Impact crushers: 10:1 to 25:1. If you need to go from 30" boulders to 3/4" aggregate (40:1 total reduction), you'll need a primary crusher and at least one secondary — no single machine achieves that ratio.

Fuel Consumption

What it says: "Fuel consumption: 16 gal/hr"

What it means: At rated load, the engine burns 16 gallons of diesel per hour.

What to know: This is the average, not the peak. Under heavy load (hard rock, tight CSS), actual consumption can be 20-30% higher. Under light load (soft material, wide CSS), it can be 20-30% lower. Multiply by your local diesel price and target hours to estimate annual fuel cost.

Transport Dimensions

What it says: "Transport width: 8' 6""

What to know: Under 8'6" wide means the machine can travel on public roads without oversize width permits (in most states). Over 8'6" requires permits, pilot cars, and potentially restricted travel times. Check both the transport width AND height — some machines fold down below 13'6" for standard bridge clearance, others don't.

The Specs That Don't Appear on Spec Sheets

The most important factors in choosing a crusher aren't on any spec sheet:

• Dealer proximity — How far is the nearest parts and service location?
• Parts lead time — How quickly can you get jaw plates, blow bars, or hydraulic components?
• Resale value — What does this brand and model sell for on the used market?
• Operator feedback — Talk to operators who've run the machine. They'll tell you things no spec sheet will.
• Setup and teardown time — How long does it take to set up and tear down for transport? This matters for contract crushers.

Need help comparing crusher specs? Contact RPG Equipment — we can help you match the right machine to your production requirements.