Buying a used mobile crusher is one of the heaviest investment decisions in Quebec's aggregate and recycling sector. The machine has to meet precise requirements for gradation, hourly throughput and mobility between sites, while being ready for resale or return to service within tight timelines dictated by production seasons. A crusher that is poorly sized for the volume to be processed or the hardness of the material causes premature wear, frequent jams and productivity too low to make the operation pay. Conversely, properly sized and well-maintained equipment can produce compliant aggregate for thousands of hours before needing major work.
Types of mobile crushers and how they work
The used mobile crusher market in Quebec mainly consists of three types of machines, each based on a different reduction principle that determines its ideal applications. A jaw crusher works by compression: two jaw plates, one fixed and one oscillating, crush the material between them, gradually reducing it to the output size set by the bottom opening. This mechanism is particularly effective on hard rock and reinforced concrete demolition materials, because it handles irregular pieces and variations in feed size well.
An impact crusher, also called an impactor, reduces material through impact: blow bars or hammers mounted on a high-speed rotor throw the material against impact plates, fragmenting it along its natural cleavage planes. This technique produces a more uniform, cubical aggregate than a jaw crusher, which is an advantage when producing aggregate for concrete or road bases. The gyratory or cone crusher, the third common type on the market, is used mainly for secondary crushing to produce fine, uniform aggregate from material that has already been crushed. The three types compare as follows on their key parameters:
- Jaw crusher: hard rock, reinforced concrete, primary crushing, high tolerance for irregular pieces
- Impact crusher: soft to medium rock, primary and secondary crushing, high-quality cubical aggregate
- Cone crusher: secondary and tertiary crushing, fine aggregate, pre-sized material
Sizing by hourly throughput and target gradation
Hourly throughput and target gradation are the two sizing parameters that must match the operation's real needs before any purchase decision. A mobile crusher's hourly throughput is expressed in tonnes per hour and reflects the amount of material processed under standard conditions with steady feed and an input size within the recommended range. Under real Quebec conditions, with abrasive rock, heterogeneous demolition materials or irregular feed by excavator, effective throughput is often 15 to 25% below the rated value.
The target gradation determines the crusher's output setting and whether the finished product complies with the standards in force in Quebec for different applications. Aggregate for road bases, structural concrete and trench backfill must meet the gradation curves specified by project owners, and the machine must be able to produce this aggregate consistently throughout the production campaign. The following table presents throughput classes and their typical applications in Quebec's aggregate industry.
| Throughput class | Typical hourly throughput | Main application | Suitable crusher type |
|---|---|---|---|
| Light | 50 to 100 t/h | Concrete recycling, demolition sites | Compact jaw crusher |
| Intermediate | 100 to 200 t/h | Mid-size quarry, road aggregate | Jaw or impact depending on material |
| Heavy | 200 to 350 t/h | Aggregate production for concrete and roads | Impact, or cone for secondary crushing |
| Industrial | Over 350 t/h | Large quarry, continuous production | Gyratory, cone, fixed plant |
Inspecting the crushing mechanism on used equipment
Inspecting the crushing mechanism is the most decisive step in evaluating a used mobile crusher, because the wear parts and structural components of the reduction system are the most expensive to replace and the hardest to assess without a thorough inspection. On a jaw crusher, the fixed and moving jaw plates wear gradually through abrasion and must be flipped and then replaced depending on intensity of use and the hardness of the material processed. A machine whose jaw plates are below 30% of their nominal thickness must be refitted before going into service, a cost to factor into price negotiations.
On an impact crusher, the blow bars and impact plates are the main wear parts. Their condition directly determines the quality of the aggregate produced: unevenly worn blow bars cause asymmetrical fragmentation that degrades the cubicity of the finished product. Items to inspect rigorously when evaluating a used crusher include:
- Remaining thickness of the jaw plates or blow bars, depending on the type of crusher
- Condition of the rotor on impact crushers: balance, no cracks on the arms or blow bar seats
- Condition of the main shaft bearings: radial play, abnormal temperature during operation
- Condition of the seals on the crusher frame, to detect leaks of abrasive fines
- Condition of the feed apron and the guide ribs leading to the crushing chamber
The power unit: electric or diesel
A used mobile crusher's power unit can be diesel or electric depending on the machine's configuration, and this choice has direct implications for operating costs and deployment logistics on Quebec sites. Self-contained diesel crushers are fully independent of the power grid, which makes them deployable on remote sites, jobsites without permanent infrastructure and mobile recycling operations. Electric or hybrid crushers, less common on the used market, offer lower energy costs when power is available on site, which is often the case in quarries and fixed recycling facilities.
Inspecting the power unit on a used mobile crusher follows the same principles as for any diesel heavy equipment: engine oil analysis to detect wear metals in suspension, a cold start test, a check of the cooling system and a reading of electronic fault codes. Specific points to check on a crusher's power unit include:
- Engine hours on the meter and intensity of use declared by the seller
- Condition of the cooling system, which is particularly exposed to crushing dust
- Condition of the belts and couplings between the engine and the crusher's flywheel
- Operation of the automatic start system and overload shutdown
- Presence and condition of the pre-lubrication system, if the machine is equipped with one
Mobility and deployment logistics in Quebec
Mobility is one of the mobile crusher's distinctive advantages over fixed plants, and it should be assessed against the real logistical constraints of the company's operations in Quebec. A tracked mobile crusher can be moved on site without a transport truck for repositioning within the quarry or jobsite, reducing production interruptions when moving to a new working area. For moves between separate sites, a heavy lowbed trailer is required, and the machine's dimensions and total weight must be checked against the load limits of the roads to be used.
Trailer-mounted or wheeled mobile crushers offer simpler transport logistics for operations that frequently move from one jobsite to another, such as concrete recycling companies that work on demolition sites rather than at a fixed facility. Mobility criteria to assess when buying include:
- Total machine weight in operating condition and in transport configuration
- Overall dimensions in transport position: length, width and height
- On-site propulsion: self-propelled tracks or towed trailer
- Setup and teardown time when moving between sites
- Access to routine maintenance points without specialized tools on remote sites
Routine maintenance and parts availability in Quebec
A mobile crusher in intensive operation generates recurring wear part needs that must be anticipated in the operating budget. The jaw plates of a jaw crusher processing abrasive rock may need replacing every 500 to 1,500 hours depending on material hardness, and the blow bars of an impact crusher have an even more variable service life depending on silica content and feed size. Availability of these wear parts in Quebec varies by brand and model age, and buying equipment whose parts must be imported on special order carries a risk of prolonged downtime during peak production.
Preventive maintenance practices that maximize the availability and service life of a used mobile crusher include:
- Inspecting and measuring wear part thickness at regular intervals to plan replacement before failure rather than in an emergency
- Checking and adjusting the output setting after every wear part replacement, since wear gradually changes the gradation produced
- Greasing the main bearings at the manufacturer's intervals, more often during intensive production campaigns on very abrasive material
- Cleaning the grizzlies and screens associated with the crusher at the end of each shift to prevent fines buildup that causes jams at startup
- Keeping a minimum stock of common wear parts on site to avoid extended downtime when unexpected premature wear occurs
Conclusion: a structured purchase for a high-stakes machine
A used mobile crusher is one of the machines where a rigorous pre-purchase evaluation pays off most directly. A thorough inspection of the wear parts, an engine oil analysis, a production test under load and a check of parts availability for the target model are the four pillars of a serious buying process for this type of equipment. The asking price of a used crusher never reflects its real value on its own: it is the combination of wear part condition, engine hours and the support logistics available in Quebec that determines whether the offer is fair.
For professionals looking for a used mobile crusher in Quebec, Publiquip brings together listings for crushers and screeners posted by specialized industry sellers across the province. Publiquip has been Quebec's go-to platform for new and used heavy equipment since 1984, with more than 50,000 unique monthly visitors to its website.
Frequently asked questions about buying a used mobile crusher in Quebec
What is the practical difference between a jaw crusher and an impact crusher for concrete recycling?
A jaw crusher is better suited to recycling reinforced concrete because it tolerates residual rebar without major damage to the mechanism, while an impact crusher produces aggregate with better cubicity but is more vulnerable to steel reinforcement, which can damage the blow bars and throw the rotor out of balance. On demolition sites where reinforced concrete is abundant and rebar separation is incomplete, a jaw crusher is generally the safest choice.
How can you estimate the hours remaining before wear parts need replacing on a used jaw crusher?
The remaining thickness of the jaw plates, compared with the new-part thickness listed in the manufacturer's manual, gives a wear percentage that can be used to estimate the remaining hours based on the typical wear rate for the type of material processed and the hardness of the rock. This estimate should be supplemented by measuring the actual output setting, which gradually increases as the plates wear and pushes the gradation beyond acceptable tolerances well before the plates are completely worn.
Can a diesel mobile crusher operate efficiently in a Quebec winter?
A diesel mobile crusher can operate in a Quebec winter provided the power unit is equipped with a block heater or fuel preheating system, and the engine and hydraulic oils are rated for the lowest temperatures expected on site. The main winter challenges are diesel fuel gelling and hydraulic oil thickening at startup, two problems solved with the same practices used on any diesel heavy equipment operating in Quebec's northern conditions.
What permits are required to transport a mobile crusher on Quebec roads?
Transporting a mobile crusher on Quebec's public roads is governed by the oversize and overweight transport regulations of the ministère des Transports et de la Mobilité durable, and most intermediate and heavy mobile crushers exceed standard weight and size limits, which means a special transport permit is required. The route, time and seasonal restrictions attached to this permit must be built into the logistics planning of every move between sites, particularly during the spring thaw, when allowable loads on the road network are reduced.
Can aggregate that meets Quebec standards be produced with a used crusher whose wear parts are partly worn?
A crusher with partly worn wear parts can still produce aggregate, but the gradation of the finished product gradually drifts from the target curve as the output opening widens with wear on the plates or blow bars. For contracts that impose strict gradation controls under the standards of the ministère des Transports et de la Mobilité durable or structural concrete specifications, it is prudent to refit a machine whose wear parts are below 50% of their nominal thickness before producing aggregate for these applications.