Excavation and demolition contractors live by a simple equation: every hour material sits unprocessed is an hour the crew, the equipment, and the schedule are working against you. The traditional response is to load that material onto trucks and pay someone else to take it away. The better response — for cost, schedule, and material reuse — is to process it on the same site that produced it. The K-JC 704 PLUS portable jaw crusher is built for exactly that.
This article walks through what the K-JC 704 PLUS actually is, the verified specs that determine whether it fits your operation, the recommended feed sizing that keeps production steady, and how it integrates with the rest of the Komplet equipment lineup to eliminate the kind of downtime that quietly drains demolition project margins.
What the K-JC 704 PLUS Is
The K-JC 704 PLUS is the most widely sold jaw crusher in the Komplet America lineup. The PLUS designation reflects the latest generation of the platform — refined hydraulics, an improved control interface, and a track configuration matched to U.S. jobsite conditions. It is the machine most contractors land on when they want a single crusher that handles the full range of typical demolition and recycling work without specializing into one extreme of the size spectrum.
What makes the 704 PLUS the workhorse choice is balance. It carries a 27″ × 16″ single-toggle hydraulic jaw, capable of processing reinforced concrete, asphalt slabs, brick rubble, and natural stone. It runs on a 74-horsepower Tier 4 Final diesel engine — large enough to maintain production, efficient enough to keep daily fuel costs predictable. And it sits on a tracked chassis that fits on a standard heavy-haul trailer for site-to-site transport.
K-JC 704 PLUS Verified Specifications
The specifications below come from the current Komplet America K-JC 704 PLUS product page. Older content with different numbers should be considered superseded by these values.
- Engine: 74 hp Tier 4 Final diesel
- Jaw inlet: 27″ × 16″ single-toggle, hydraulically adjustable
- Output capacity: up to 90 US tons per hour
- Recommended feed size: roughly 12.8″ minus (20% smaller than the smallest opening dimension)
- Track options: steel tracks with rubber pads OR full rubber tracks (selectable at order)
- Vibrating hopper with pre-jaw inlet sensor that turns the feeder on/off to prevent jams
- Reverse jaw function for sticky materials and clearing
- Magnetic separator attachment available for ferrous extraction
- Operation: wireless remote — single operator from outside the active machine zone
Recommended Feed Sizing — and Why It Matters
A common mistake operators make with any jaw crusher is feeding material at the absolute maximum opening size. The 704 PLUS’s 27″ × 16″ jaw will physically accept material up to that size, but feeding consistently at the limit causes problems: the jaw can wedge, the feeder backs up, and production stalls.
The practical rule is to size feed material to roughly 20% smaller than the smallest opening dimension — about 12.8″ minus for the 704 PLUS. Material at that size moves through the jaw smoothly, the feeder stays consistent, and the operator gets predictable production. Material at the absolute maximum may go through, but at the cost of stop-start production.
On a real demolition site, that means breaking up oversized slabs with a hydraulic breaker before they reach the crusher hopper, or using a slow-speed shredder upstream to reduce bulky and contaminated material to a feed size the crusher can process steadily. The Krokodile PLUS slow-speed shredder fills exactly that role for many operations running the 704 PLUS.
What the K-JC 704 PLUS Processes
The 704 PLUS handles the materials that show up on most demolition and excavation sites:
- Reinforced concrete — slabs, foundations, demolition rubble (light to moderate rebar contamination)
- Asphalt — slabs, demolition pavement, road removal material
- Brick, block, and masonry rubble
- Natural stone — limestone, granite, sandstone, and similar quarry feed
- Mixed C&D debris within the recommended feed size range
The output is angular crushed aggregate sized by the closed-side jaw setting, which is hydraulically adjustable. Typical output ranges run from sub-inch product up to several inches, depending on what the jobsite needs.
How the K-JC 704 PLUS Eliminates Downtime
Excavation and demolition projects that depend on off-site material processing absorb downtime in places contractors rarely measure directly:
- Time waiting for trucks to clear staging areas before crews can continue working
- Hauling and tipping fees that scale with project size
- Wait time for purchased aggregate to be delivered as fill or base material
- Coordination overhead of scheduling third-party processors
- Project-margin compression as material handling costs escalate
Bringing a 704 PLUS onto the site changes that equation. Demolition material goes into the crusher hopper directly from the excavator. Crushed output goes onto the discharge belt and stockpiles or feeds downstream into a screener for sized product. The loader and excavator that produced the material can keep cycling without waiting for trucks to clear. The same site that generated the waste produces the aggregate that fills the foundation, base, or fill requirement — usually at a fraction of the cost of buying it in.
How the 704 PLUS Pairs with Other Komplet Equipment
Most operations don’t buy a crusher in isolation. They buy it as part of a system that handles whatever the site produces. The 704 PLUS pairs naturally with the rest of the Komplet equipment lineup:
Paired with a Kompatto 5030 heavy-duty vibrating screener or Kompatto 221 vibrating screener, the 704 PLUS produces aggregate that gets sorted into multiple sized products in a single operational flow — coarse fill, sub-base material, fine aggregate.
Paired with a Krokodile PLUS slow-speed shredder, the shredder reduces bulky and contaminated material upstream to a size the crusher can process steadily — particularly useful for mixed C&D demolition where feed material varies widely in size and content.
Paired with the K-TC 460 portable mobile conveyor, the conveyor extends discharge reach for stockpiling, truck-loading, or feeding downstream equipment without repositioning the crusher itself.
Track Configuration Options
The K-JC 704 PLUS is available with one of two track configurations, selectable at order:
Steel tracks with rubber pads — the configuration on most working units in the U.S. fleet. Steel tracks handle harder, more abrasive sites and resist wear from sharp demolition debris. The rubber pads protect the tracks during transportation between sites.
Full rubber tracks — better suited for road moves between sites and for asphalt-sensitive surfaces where steel track wear marks are a concern. Full rubber gives a smoother ride during repositioning but generally has shorter service life on heavily abrasive sites.
Most contractors order the configuration that matches their typical site conditions. If your work splits roughly evenly between hard demolition sites and finished surfaces, talk to your dealer about which option fits your specific work mix.
Operating Considerations and Maintenance
Operating any jaw crusher responsibly starts with three universal practices: refer to the user manual for the specific machine model and serial number, ensure operators are properly trained on the controls and emergency stops, and maintain the OEM service intervals. Specific to the 704 PLUS:
- Size feed material to the recommended 12.8″ minus range. Material consistently at the maximum opening size will reduce production through stalling and clearing time.
- Use the reverse jaw function when material wedges or sticks. The function is built specifically for this; manual clearing while the jaw is loaded is unsafe.
- Inspect jaw plates regularly for wear. Worn plates reduce production and can damage the toggle mechanism if run too long past their service life.
- Maintain hydraulic system fluid and filters per OEM intervals. Hydraulics drive the jaw adjustment, the reverse function, and the track movement — neglected hydraulics affect every aspect of the machine’s operation.
- Engine service per OEM Tier 4 Final intervals — DEF, DPF, oil, and emission system maintenance.
Frequently Asked Questions
What is the difference between the K-JC 704 and the K-JC 704 PLUS?
The K-JC 704 PLUS is the current production version of the 704 platform — with refined hydraulics, an improved control interface, updated emissions compliance, and track configurations matched to U.S. jobsite conditions. The base “K-JC 704” name without the PLUS designation refers to earlier generations no longer in current Komplet America offering. Current orders are all K-JC 704 PLUS.
What is the recommended maximum feed size for the K-JC 704 PLUS?
The practical rule is roughly 20% smaller than the smallest dimension of the jaw opening — about 12.8″ minus for the 704 PLUS’s 27″ × 16″ jaw. Material at the absolute maximum opening size can wedge or stall the jaw; sizing about 20% under keeps production steady.
Can the K-JC 704 PLUS handle reinforced concrete?
Yes. The 704 PLUS is engineered to process reinforced concrete with normal demolition-grade rebar contamination. The reverse jaw function allows operators to clear sticky or jammed material without manual intervention. Heavily reinforced material with closely spaced or oversized rebar bundles processes more reliably with a slow-speed shredder ahead of the crusher.
What kind of output does the K-JC 704 PLUS produce?
The 704 PLUS produces angular crushed aggregate sized by the closed-side jaw setting, which is hydraulically adjustable. Typical output runs from sub-inch product up to several inches depending on what the jobsite needs. Pairing the crusher with a vibrating screener downstream sorts that output into multiple sized products in a single operational flow.
How much does a K-JC 704 PLUS cost?
Approximate U.S. list price is around $241,000 with the magnetic attachment, varying by configuration, dealer location, and any added features. Pricing does not include taxes, shipping, or installation. Pre-owned options and financing structures can change the effective acquisition cost meaningfully. Contact Komplet America or your local dealer for current pricing on a specific configuration.
What kind of warranty comes with the K-JC 704 PLUS?
The K-JC 704 PLUS ships with a 12-month / 1,000-hour standard warranty, whichever comes first. Komplet America provides U.S.-based parts inventory and a service-provider network for setup and repair. See the Komplet America parts and support page for current warranty terms.
Is rental availability the same as purchase availability?
Rental availability depends on dealer location and current inventory. The K-JC 704 PLUS is one of the most commonly stocked rental units in the Komplet America dealer network because of its versatility across demolition and recycling work. Find your local Komplet dealer for current rental availability in your region.
Final Thoughts
Excavation and demolition downtime is the kind of cost that doesn’t show up on a single line item — it shows up in extended project timelines, escalating hauling fees, and crews waiting for trucks to clear staging areas. The K-JC 704 PLUS attacks that downtime directly by processing demolition material on the same site that produced it, into aggregate the project can use or sell.
If the 704 PLUS sounds like the right fit for your operation, the most useful next step is a conversation with someone who has placed the machine into similar work. Komplet America’s team and dealer network can walk through your typical feed mix, daily production targets, and equipment pairings to recommend a configuration — track type, magnetic attachment, downstream pairings — that matches your specific work.
Komplet America is the official U.S. distributor of Komplet SpA crushing, screening, and shredding equipment. The full crusher lineup includes the K-JC 503, K-JC 604, K-JC 704 PLUS, K-JC 805, and K-IC 70, supported by U.S.-based parts inventory, service network, and financing options. Reach out via the contact page or find your local Komplet dealer to start a conversation.
Ready to Eliminate Demolition Downtime?
- Browse the full crusher lineup to compare specs across models
- Check pre-owned inventory for cost-effective entry options
- Explore financing structures that match your tax and balance-sheet position
- Contact Komplet America for a quote tailored to your operation
- Find your local Komplet dealer for rental availability and demo opportunities
Never enough — that’s how we approach service, support, and helping operations get the most from their compact crushing, screening, and shredding equipment.
Equipment prices are subject to change based on dealer location, availability, and any additional features or customizations. Prices do not include taxes, shipping, or installation fees, which may apply depending on your region. Contact Komplet America for current pricing.
Disclaimer: All operating, maintenance, and service guidance in this article is general in nature. Always refer to the official Komplet operator’s manual for the specific machine model and serial number, and follow OEM intervals and procedures. For warranty-protected work, contact Komplet America or your authorized Komplet dealer. Improper service or non-OEM parts may void warranty coverage and create safety hazards.
