Gyratory Crusher Liner Selection & Maintenance Guide

Why gyratory liner selection is critical

Gyratory crushers are the workhorses of primary crushing — processing 1,000–10,000+ tph of run-of-mine material. A liner change can take 8–36 hours of downtime, making correct selection and maximum life essential for mine productivity.

Unlike jaw crushers where two plates do the work, a gyratory crusher has a full 360° crushing chamber lined with multiple concave segments surrounding a single mantle. This means:

• More wear surface — 6–12 concave segments plus the full mantle
• Higher replacement cost — a complete liner set for a 60” gyratory can exceed $200,000
• Longer change-out time — 12–24 hours for a full reline vs. 2–4 hours for jaw plates
• Greater production impact — every hour of unplanned downtime costs $10,000–50,000+ in lost production

Mantle selection

The mantle is the conical crushing surface that gyrates inside the stationary concave. It experiences the highest unit pressure in the crushing chamber — the nip point where the gap is smallest.

Material selection

Material	Hardness (HB)	Best for	Typical life
Mn18Cr2	300+	Standard primary crushing, moderate abrasion	6–12 months
Mn22Cr2	330+	High impact, large feed, moderate abrasion	8–14 months
Mn18Cr2+Mo	340+	High abrasion + impact balanced	10–16 months
Cr26 martensitic	600+	Very high abrasion, low impact (secondary/tertiary)	6–10 months

Key principle: For primary gyratories with large feed (>1,000 mm), always start with manganese (Mn18Cr2 or Mn22Cr2). The high impact energy work-hardens the surface to 450–550 HB in service. Chromium iron (Cr26) is too brittle for primary applications — it will chip and spall under the impact of large boulders.

For material science details, see our manganese steel heat treatment guide and materials page.

Profile selection

Profile	Characteristics	Best for
Standard (steep)	High reduction ratio, narrower crushing zone	Primary crushing with tight product spec
Coarse (flat)	Wider crushing zone, higher throughput	Primary crushing feeding a secondary screen
Intermediate	Balanced reduction and throughput	Most common primary application

Concave selection

Concave segments (typically 6–12 per set) line the stationary outer shell. They experience lower unit pressure than the mantle but cover more surface area.

Material selection

Concaves can use a different material than the mantle — this is a common optimisation:

• Mantle: Mn18Cr2 or Mn22Cr2 (needs impact resistance at the nip point)
• Concaves: Mn18Cr2+Ti or Cr26 (higher abrasion resistance, lower impact at the shell)

This “split-grade” approach can extend overall liner life 15–25% by matching each component’s material to its actual wear mechanism.

Segment replacement strategy

Concave segments wear unevenly — the top segments (feed entry) typically wear 20–30% faster than the bottom segments. Two strategies:

1. Full-set replacement: Replace all segments together when the most-worn segment reaches the limit. Simpler scheduling but wastes remaining life in bottom segments.

2. Staggered replacement: Replace top and bottom segments on different schedules. More complex but can reduce annual liner cost 10–15%. Requires careful tracking of individual segment wear.

Spider arm liners and rim liners

The spider arm liners and rim liners protect the crusher top structure from feed impact and abrasion. They’re often overlooked but critical:

• Worn spider liners allow material to abrade the spider arms — structural damage that requires welding repair or spider replacement ($50,000+)
• Worn rim liners change the feed distribution, causing off-centre loading and uneven concave wear

Material: Mn18Cr2 standard; Cr26 for high-abrasion applications Replace when: Thickness at 50% of original, or when feed distribution becomes visibly uneven

Eccentric bushing and thrust bearing

While not wear liners, the eccentric bushing and thrust bearing directly affect liner life:

• Worn eccentric bushing: Changes the gyration stroke, affecting the nip angle and crushing force distribution. Can cause uneven liner wear and reduced throughput.
• Worn thrust bearing: Allows the mantle to drop, closing the CSS (closed-side setting) and potentially causing overload.

Inspection interval: Every liner change (6–12 months). Measure bushing clearance and thrust bearing wear. If clearance exceeds OEM spec by 50%, schedule replacement.

Installation best practices

1. Mantle seating: Use a full-contact epoxy backing compound. Any void behind the mantle creates a flex point that will crack the liner prematurely.
2. Concave segment fit: Check each segment’s contact with the shell — gaps >1 mm require shimming. Uneven seating causes segment shifting and uneven wear.
3. Bolt torque: Follow OEM specification precisely. Over-torquing cracks the segment; under-torquing allows movement and work-hardens the bolt holes.
4. CSS measurement: After installation, measure the CSS at 4 points around the chamber. Variance >10% indicates uneven seating — correct before starting.
5. Spin the crusher: Run the crusher empty for 15–30 minutes after reline. Listen for unusual sounds (indicates seating issues) and recheck bolt torque.

Brand & model cross-reference

Brand	Series	Mantle weight	Standard material	Notes
Metso/Nordberg	Superior 42–70	8–35 tonnes	Mn18Cr2	Primary & secondary
Sandvik	CG820–CG850	10–40 tonnes	Mn18Cr2	Hydropneumatic CSS adjust
FLSmidth	Fuller-Traylor 54–80	12–50 tonnes	Mn22Cr2 option	Top-service design
ThyssenKrupp	KB 54–80	10–45 tonnes	Mn18Cr2	Kubria series

Use our cross-reference tool for exact part numbers, or browse all crusher models we support.

Common problems and solutions

Problem	Root cause	Solution
Uneven concave wear (top-heavy)	Feed not centred, off-centre loading	Install or repair feed chute centring ring
Mantle cracking at base	Poor epoxy backing, void behind liner	Use proper backing compound, ensure 100% fill
Concave segment shifting	Insufficient bolt torque, worn bolt holes	Retorque to spec, replace worn keepers
Excessive fines in product	CSS too tight, worn liners creating tight spots	Reset CSS, check for localized wear
Reduced throughput	Liner profiles too steep, worn eccentric bushing	Consider flatter profile, check bushing clearance
Liner spinning on seat	Failed backing compound, bolt failure	Reback with fresh compound, replace bolts

Maintenance scheduling

Predictive approach (recommended)

1. Measure wear at each shutdown — use profile gauges at 4–8 points around the mantle and each concave tier
2. Plot wear rate — extrapolate to predict when the 50% wear limit will be reached
3. Schedule reline 2–4 weeks before predicted limit — allows parts procurement and crew scheduling
4. Track cost per tonne — divide liner cost by tonnes processed to optimise material selection

Calendar-based approach (simpler but wasteful)

Component	Typical interval	Risk
Mantle	6–12 months	May replace too early (waste) or too late (breakdown)
Concaves (full set)	8–14 months	Same risk, higher cost impact
Spider/rim liners	12–18 months	Often neglected until structural damage occurs
Eccentric bushing	24–36 months	Failure is catastrophic — don’t defer

FAQ

How long should gyratory crusher liners last?

In primary crushing of medium-abrasion ore (copper, iron), 6–12 months continuous operation. Highly abrasive taconite or quartzite can reduce this to 3–6 months. Soft overburden or coal can extend to 18+ months.

Can I use different materials for mantle and concaves?

Yes, and it’s recommended. The mantle sees higher impact at the nip point — use Mn18Cr2 or Mn22Cr2. The concaves see more abrasion and less impact — Mn18Cr2+Ti or Cr26 can outperform here. This “split-grade” approach can extend overall set life 15–25%.

What’s the cost of a full liner set?

For a 60” (1,520 mm) primary gyratory: mantle $40,000–80,000, concave set $80,000–150,000, spider/rim liners $10,000–20,000. Total: $130,000–250,000 per reline. Extending life even 10% saves $13,000–25,000 per cycle.

How long does a reline take?

With a trained crew and proper equipment: 12–18 hours for mantle + concaves. Add 4–8 hours for spider/rim liners. Total shutdown: 16–26 hours. First-time crews can take 30–40+ hours.

Should I recondition or replace a worn mantle?

If wear is uniform and the base structure is sound, reconditioning (hard-facing overlay + machining) costs 40–60% of new and can extend life 50–80%. However, reconditioned mantles may not achieve the same work-hardening response as new — best for concaves (lower impact) rather than mantles.

Why is my mantle wearing faster at the top?

Top-heavy wear indicates the feed is entering too high in the chamber, spending most of its crushing energy in the upper zone. Adjust the feed chute to deliver material at the optimal feed level (typically 1/3 from the top of the chamber). See also our cone crusher liner guide for similar principles.

Summary

Gyratory crusher liner selection comes down to three decisions: mantle material (manganese for primary impact resistance), concave grade (can be harder than the mantle for abrasion), and maintenance discipline (predictive wear tracking beats calendar-based scheduling). Combined with proper installation (epoxy backing, correct torque, CSS verification), these practices can extend liner life 20–30% and save tens of thousands per reline cycle.

Need liners for your Superior, CG, or Fuller-Traylor gyratory? Browse our gyratory crusher parts catalog or request a custom design — send us your model, ore type, and operating data.