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Forestry attachment wear parts, tools and components arranged on a workshop bench for inspection

T06 · Used equipment · condition assessment

How to inspect a used forestry attachment before buying

The short answer

Identify the exact model and serial first, then inspect structure, pins, bearings, wear system, hydraulics, controls and supplied fitment as separate cost lines. Test the head hot on representative material and price every missing bracket, hose, controller and overdue wear item before comparing it with a complete new quotation.

Procedure

Complete the work in this order

  1. 01

    Verify identity and ownership

    Record make, model, serial, year, seller details and proof of ownership. Obtain manuals, original specification, service records and the carrier it ran on. Confirm the serial with the distributor and ask whether parts and technical documents remain available.

  2. 02

    Inspect the load structure

    Clean enough material away to see bracket welds, pin bosses, main frame, guards and high-stress transitions. Look for cracks, distortion, fresh paint, non-standard plating and elongated holes. Ask who performed repairs and whether engineering or weld records exist.

  3. 03

    Measure wear rather than viewing it

    Compare teeth, blades, chains, bars, holders, bushes, pins and jaw edges with service limits. Measure play and remaining dimensions where possible. Build a priced list of immediate and near-term replacements instead of accepting ‘plenty of life’ as a condition report.

  4. 04

    Test hydraulics and controls

    Check hoses, couplers, cylinders, motor leakage, rotator play, valve blocks, wiring, sensors and controllers. Run every function from cold to operating temperature under realistic load. Record pressure, drain condition, unusual noise and whether functions can operate together.

  5. 05

    Price the complete installed package

    List bracket changes, hitch work, hoses, couplers, case drain, controller, wiring, guarding, freight, commissioning and tax. Add the first wear service and a contingency for hidden defects. Compare that delivered-and-working figure with a new package carrying warranty.

Read the machine’s previous job in its wear

Wear patterns reveal operation. Uneven rotor or blade wear may indicate imbalance, ground contact or damaged holders. Polished hose sections show movement against the boom. Distorted guards can indicate debris impact, while play concentrated on one side of a jaw can point to repeated side loading.

Ask what material, soil and annual hours the attachment saw, then see whether the condition supports the story. Meter hours on a carrier do not prove attachment hours, and fresh paint does not restore dimensions. Photographs from earlier ownership and parts invoices are more valuable than an unsupported estimate.

Know when inspection needs a specialist

Oil leakage, structural repairs, rotor vibration, unusual motor noise, electronic faults and unknown control systems justify an independent inspection. A specialist can pressure-test cylinders, measure case leakage, assess weld repair and confirm whether software or proprietary controls can be supported on the intended carrier.

Walk away when identity is unclear, critical parts are unavailable, major repairs cannot be documented or the seller will not permit a loaded test. A low purchase price cannot compensate for an attachment that cannot be fitted, supported or trusted under forestry loads.

Common mistakes

Valuing the bracket as universal

Machine-specific fitment can turn the supplied bracket into scrap rather than an asset.

Testing functions without load

Weak motors, slipping drives and heat problems may not appear while free-running.

Ignoring controllers and wiring

A missing proprietary control package can be expensive or impossible to replace.

Comparing purchase prices

The useful comparison is delivered, repaired, installed and working on your carrier.

Continue the job

Wear-parts guide

Identify the components that turn condition into operating cost.

Attachment costs

Compare used and new as complete installed systems.

Commission the attachment

Create a baseline after purchase and repair.

More field procedures

Keep building the machine record

Technician checking hydraulic hoses and test equipment on an excavator attachment circuit
T01

Measure auxiliary flow

Use a calibrated flow meter and load valve at normal operating temperature, test the intended auxiliary circuit in both required directions, and record flow at the attachment manufacturer’s working pressure. The machine’s advertised pump output is not the number the attachment receives.

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Excavator auxiliary hoses, couplers and hydraulic service points being inspected
T02

Identify the hydraulic circuit

Trace the hoses and controls rather than counting couplers. Confirm whether flow is one-way or reversible, whether a low-pressure case drain returns independently to tank, and whether two attachment functions can operate at the same time. Then verify the result against the machine manual and a functional test.

Open tutorial →
Forestry excavator holding a cut tree section with an attachment at working radius
T03

Size an attachment to a carrier

Treat published carrier tonnes as an initial filter. The final match requires attachment mass with bracket and rotator, excavator lift capacity at the actual radius and sector, usable hydraulic flow and pressure, transport configuration, guarding, and the maximum material the head will retain.

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Forestry attachments and excavators prepared in a machinery yard for installation and commissioning
T04

Install and commission an attachment

Commission the ordered attachment as one installed system. Verify identity and mass, mechanical fit, hose routing, hydraulic settings, control logic, guarding and transport before loading it on representative material. Record baseline pressures, temperatures, cycle times and operator limits for future troubleshooting.

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Excavator-mounted stump grinder with hydraulic supply, return and case-drain hoses visible
T05

Set up a case drain

Route the motor’s case-drain port through a dedicated, correctly sized, low-restriction line to the approved tank connection. Confirm the attachment manufacturer’s maximum drain pressure and measure it at working temperature. Never cap the port or tee it casually into a pressurised return.

Open tutorial →
Forestry attachment wear parts, tools and components arranged on a workshop bench for inspection
T06

Inspect a used attachment

Identify the exact model and serial first, then inspect structure, pins, bearings, wear system, hydraulics, controls and supplied fitment as separate cost lines. Test the head hot on representative material and price every missing bracket, hose, controller and overdue wear item before comparing it with a complete new quotation.

Open tutorial →
Forestry machinery fleet in an Australian equipment yard representing ownership and tender costs
T07

Calculate a tender rate

Choose the unit the client accepts, estimate completed units per productive hour from comparable work, calculate the full hourly cost of carrier, attachment and crew, then add mobilisation, wear variability, downtime, overhead, risk and margin explicitly. Do not turn a demonstration cycle into an all-in hectare or stump rate.

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Forestry attachment wear parts, hand tools and service items organised on a workshop bench
T08

Build a wear-parts kit

Stock parts by failure consequence, consumption rate and replenishment lead time—not by what is cheapest. Carry enough teeth, blades, chains, hoses, couplers, fasteners and service tools to protect the next work period, with every item matched to the exact attachment serial range and a reorder point recorded.

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