06/10/2025 By CNCBUL UK EDITOR Off

Before You Buy: Essential Criteria for Evaluating a Used, Second-Hand, Pre-Owned, Surplus Accurshear 662520 Hydraulic Shear made in China

When evaluating a used / surplus Accurshear 662520 hydraulic (power-squaring) shear, making informed, technical judgments up front can save you from costly surprises. Below is a detailed set of essential criteria, red flags, and best practices to guide your inspection and decision.

1. Understand the “as-built” baseline spec

Before you visit, you must know what the standard or expected parameters are for the Accurshear 662520. This gives you a benchmark against which to measure the used machine.

From listings:

The 662520 is often quoted as 20 ft (≈ 6.1 m) blade length × 5⁄8 in (0.625 in, ≈ 15.9 mm) maximum thickness in mild steel.
It is commonly equipped with programming / CNC front gauging, a 48 in back gauge (≈ 1,219 mm)
Blade size cited: ~ 1.125 in × 5 in × 244 in (i.e. 28.6 mm × 127 mm × 6,200 mm) in some listings.
It uses a power (hydraulic) blade gap adjust system.
Number of hold-downs in listings: 30 hold-down devices
Cycle rates (with optional “high-speed” setting): full stroke ~ 9 strokes/minute; short-stroke / high-speed ~ 27 strokes/minute.
Drive motor: often 50 HP in listings.
Approximate weight: “90,000 lbs” for base machine in some listings (≈ 40,800 kg)

Use these as reference — if a used machine deviates significantly, you’ll want a clear explanation or justification.

2. Review documentation & machine history

Before or during your inspection, try to obtain:

Maintenance / service logs — dates, what was replaced or reconditioned
Usage / duty history (how heavily was it used, duty cycles)
Original manuals, schematics, parts lists
Any upgrades, retrofits, or replacements (e.g. hydraulic pump swap, control upgrades)
Reasons for sale
Spare parts or tooling included (extra blades, clamps, seals)

If the seller cannot provide credible documentation, treat that as a risk indicator.

3. Structural & visual inspection

Walk around the machine carefully. Good lighting, a flashlight, and a camera (to record) are essential. Look for:

Cracks, repairs, welds, distortions in the frame, shear housing, side plates
Evidence of corrosion, pitting, or rust (especially in bed, underside, hydraulic tank)
Straightness and alignment: check whether the machine appears symmetric; observe for sagging
Condition of guards, safety shields, covers (missing panels etc. are red flags)
Table surfaces, supports, side arms, front arms — check for bending, warping
Bed, frame, substructure for damage or previous structural repair

The structural integrity is foundational — if the frame or shear beam is compromised, achieving precision is extremely difficult or impossible.

4. Blade, holder & cutting mechanics

The blade subsystem and associated mechanics are among the highest risk / cost items. Check:

Blade condition: look for chips, nicks, excessive wear, uneven edges
Blade holder & clamp bars: check for bending, warping, cracks
Blade clearance / gap adjustment: test the full range; ensure the powered gap adjust (if present) works smoothly and across full width
Whether the blade holders are firmly mounted, show no looseness or play
Whether alternate sides of the blades are still usable (if 4-sided blades) — many listings mention “4 sides per blade” for this model.
Whether blade change is practical (i.e., accessibility, toolings for replacement)

If blade or clamp parts are heavily compromised, the repair cost may be high and cause extended downtime.

5. Hold-downs / clamping system

The hold-down (clamping) system is crucial for sheet stability and cut quality.

Check that all hold-downs are present and operational (for the 662520, listings suggest 30 hold-downs)
Inspect their rails, guides, linkages, actuation (hydraulic or mechanical) for wear, binding, misalignment
Cycle them while the machine is off (manual or test) to see smooth motion
Ensure uniform pressure and check that none are sticking or lagging
Confirm synchronization across the width

If some hold-downs are nonfunctional or poorly aligned, sheet clamping will be uneven, leading to bad cuts or safety risks.

6. Hydraulic system, pumps, cylinders, piping

Because this is a hydraulic shear, the condition of the hydraulic system is absolutely critical.

Inspect cylinders for pitting, scratches, scoring on rods, seal leakage
Test for seepage or external leakage from cylinders, hoses, fittings, junctions
Check hoses (cracks, wear, abrasion), fittings, coupling integrity
Examine hydraulic tank: check fluid level, signs of contamination (metal particles, sludge), water ingress
Ask whether filters, coolers, and fluid have been maintained or replaced
Test operation (slow, controlled) to see whether the shear drifts, moves on its own, or behaves unpredictably
Observe whether the hydraulic system holds pressure steadily or has fluctuations
Check relief valves, pressure gauges, accumulators (if present), valve blocks, and spool valves

A failing hydraulic system is often among the costliest and most time-consuming repairs in such machines.

7. Mechanical motion & precision (gears, linkages, alignments)

Beyond hydraulics, the mechanical motion components must be in good shape.

Move the shear beam / blade carriage: see whether it travels smoothly, with no jolts or binding
Check for play or backlash in linkages, pivot points, pins, wear in bearings or bushings
Check alignment across the entire length — does the carriage stay parallel to bed surfaces?
Inspect guides, rails, slides for wear, lubrication, corrosion
Check synchronization (if dual drive or dual cylinders) — both sides should move together without twist

Poor mechanical motion directly affects cut accuracy and repeatability.

8. Control system, electronics, and CNC / automation features

List-based descriptions mention the 662520 may include CNC front gauging and programmable controls.

During inspection, verify:

Power-up behavior: are displays, buttons, controls responsive, free of errors
All cabling, wires, connectors: check for overheating, modifications, nonstandard splices, corrosion
Test limit switches, sensors, interlocks, home/reference switches
Verify front gauge electronics (CNC front gauging) function, including programming of parts, repeatability
Test back gauge motion, accuracy, repeatability
Confirm whether control software / licenses are present, modifiable, backed up
Assess whether the control board / electronics are original or retrofits; check availability of spare boards
Test input/output signals, any PLC logic if used

If the electronic or control subsystem fails or is obsolete, replacement can be expensive and may nullify the value of the rest of the machine.

9. Functional / operational tests & cut trials

No matter how good the visual looks, the machine must be tested under real working conditions.

Run the shear in “no-load” mode first: see for smooth, drift-free motion, consistent movement
Perform test cuts using metal sheet of thickness near the machine’s rated capacity (or your typical job)
- Measure cut dimensions, deviations, parallelism across width
- Inspect edge quality, burrs, shearing defects
- See how many cycles before performance degrades
Test back gauge movement & repeatability (repeatedly command same position, check variation)
Test gauge and front gauging (if installed) to see whether programmed offsets are accurate
Cycle hold-downs and verify they hold sheet uniformly during the cut
Trigger emergency stops / safety interlocks mid-cycle to see how machine responds
Observe hydraulic pressure stability, noise, vibration during operation
If machine has stacking or conveyor features, test those too

If performance is inconsistent, or cuts deviate by more than acceptable tolerance, you’re looking at potential major adjustments or repairs.

10. Precision, tolerance & measurement validation

Use precision instruments to verify machine is within acceptable tolerances:

Check blade runout (front and back) with a dial indicator
Measure cut width / dimension deviations across full blade span
Check parallelism and squareness
Check back gauge accuracy & repeatability
Monitor consistency over sequential cuts — whether parts drift over time
If possible, compare to prior calibration or alignment records

If you find errors well beyond your use tolerances, you must evaluate whether the cost to correct is justified.

11. Spare parts & future supportability

A used machine is only as good as your ability to maintain it.

Confirm availability of critical spare parts: blades, clamp bars, seals, hydraulic parts, valve spools, electronics
Check whether the original manufacturer (Accurshear / Accurpress) or third-party dealers still support parts for the 662520
Assess whether local or regional service houses can repair hydraulics, control boards, machining parts
Ask if seller can include spare parts (extra blades, seals, consumables)
Evaluate cost and lead time of replacement components
Consider retrofit capability (e.g. ability to upgrade control)

If parts are obsolete or scarce, the machine may become expensive to maintain or repair.

12. Pricing, negotiation & risk buffer

Once you’ve done your inspection, you should have a list of deficiencies and required fixes. Use that as negotiation leverage.

Get estimates for fixes (blade replacement, hydraulic repair, control electronics)
Ask seller to discount or allow for repairs / refurbishment
Factor in transport, rigging, reinstallation, alignment, commissioning costs
Build in contingencies (10-20 % or more) for hidden issues
If possible, secure a short-term warranty or conditional guarantee (e.g. within 30 days)
Compare with alternative machines or listings to ensure you’re not overpaying

Don’t let emotion outweigh the technical reality.

13. Post-purchase installation & check-in steps

After purchase, carefully install and commission:

Ensure a proper foundation, leveling, anchoring
Flush hydraulic oils, replace filters, check cleanliness
Re-check alignment, squareness, blade gap, mechanical synchronization
Run break-in cycles at reduced loads, gradually ramp up
Make baseline measurements and document performance
Train operators and safety protocols
Start a rigorous maintenance / logbook

If errors or drift appear early, you might have recourse (if purchase agreement allows) to claim under seller obligations.

Summary & risk-avoidance checklist

To sum up, your goal is to validate:

Structural integrity (frame, housing)
Blade & holder condition + gap adjustment
Hold-down system completeness & functionality
Hydraulic system health (cylinders, hoses, pumps, fluid, valves)
Mechanical motion / alignment / precision in motion
Control electronics / gauges / CNC subsystem health
Successful performance in test cuts & repeatability
Spare parts availability & repair support
Reasonable price with buffer for remediation

If a used Accurshear 662520 checks well across these criteria, you can mitigate much of the risk. If multiple major deficiencies crop up (e.g. structural damage, hydraulics needing full rebuild, control system problems, unavailability of spare parts), the “discount” price may not make it worthwhile.