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Forestry Equipment Hydraulics

Forestry

Forestry Equipment Hydraulics

Hydraulic Supply Company stocks the extreme-duty hoses, cylinders, fittings, and pumps that keep skidders, feller bunchers, harvesters, and forwarders running in the woods.

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Forestry equipment operates in conditions that push hydraulic components to their limits: continuous high-pressure cycles, abrasion from bark and debris, extreme temperatures, and remote locations where a failed hose means a machine down for a full day. Hydraulic Supply Company stocks the extreme-duty hydraulic hoses for forestry equipment, forestry hydraulic cylinders, fittings, and pumps required to keep skidders, feller bunchers, harvesters, forwarders, and delimbers running. We also stock hydraulic components for forestry from Eaton and other leading manufacturers.

Our hose inventory includes SAE 100R12 and 100R15 spiral hose rated for the continuous high-pressure, high-cycle demands of grapple, boom, and feed roller circuits. Every HSC branch is a certified Danfoss Aeroquip Hose Center. We fabricate custom hose assemblies on-site the same day, with no minimum order, so a downed machine does not have to wait for a freight shipment.

Shop 70,000+ products online with same-day shipping on orders placed before 2 PM EST, or visit any branch for counter service.

Certified Danfoss Aeroquip Hose Center

Same-day custom hose assembly

Extreme-duty spiral hose

No minimum order

Hydraulic Hoses for Forestry Equipment

Hydraulic Hoses for Skidders, Feller Bunchers, and Harvesters

Forestry hydraulic systems operate at 3,500 to 5,000 PSI with high cycle rates and significant impulse pressure spikes during grappling and delimbing operations. The correct specification for these circuits is SAE 100R12 (4-wire spiral) or SAE 100R15 (6-wire spiral) for maximum cycle life. Wire braid hoses (SAE 100R1, 100R2) are appropriate for lower-pressure accessory circuits.

HSC also stocks spiral-wrap abrasion guards, heat sleeves, and nylon braided protective sleeving to extend assembly life in high-abrasion zones common in forestry equipment. For spiral hose ratings on high-cycle circuits, see our guide to forestry hose specifications.

Common Applications

Skidder grapple boom and swing circuits (100R12/R15 required)

Feller buncher accumulator and saw head circuits

Cut-to-length harvester feed roller and boom circuits

Forwarder crane slewing and grapple circuits

Delimber feed and gate cylinder circuits

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High-pressure spiral hydraulic hose assemblies with crimped steel fittings and abrasion sleeving routed along the boom of a gray forestry skidder in the woods

Heavy-duty welded hydraulic cylinder with a polished chrome rod on the boom of a gray forestry feller buncher

Hydraulic Cylinders for Forestry Machinery

Forestry hydraulic cylinders experience severe side-load forces, heavy contamination exposure, and demanding duty cycles. HSC stocks welded hydraulic cylinders in bore sizes from 2 inches to 8 inches to match common skidder, feller buncher, and harvester configurations.

Cylinders with heavy-duty rod seals and chrome-plated rods are recommended for forestry applications to resist contamination and extend service life. Cylinder seal kits and rod seal assemblies are stocked for in-shop rebuild.

Common Applications

Skidder blade and arch cylinders

Feller buncher boom lift and tilt cylinders

Harvester head and measuring wheel cylinders

Forwarder bunk and bolster cylinders

Log loader outrigger and boom cylinders

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Hydraulic Pumps and Motors for Forestry Applications

Hydraulic Pumps and Motors for Forestry Equipment

Gear motors drive rotation functions on grapples and processing heads. Piston pumps power the high-pressure circuits on modern cut-to-length harvesters. HSC stocks gear motors in a range of displacements for grapple rotation and piston pumps for high-pressure open- and closed-circuit systems.

Hydrostatic transmissions for skidder drive systems are also available. Contact an HSC branch for specification matching on less common configurations.

Common Applications

Gear motor replacement for grapple rotation on skidders and loaders

Piston pump service on cut-to-length harvester hydraulic systems

Hydrostatic drive pump and motor replacement on skidders

Geroler motor replacement on saw heads and processing units

Vane motor replacement on wood chipper feed systems

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Cast-steel hydraulic gear motor and piston pump with steel ports mounted on gray forestry harvester equipment in the woods

Assortment of steel BSP, ORFS, and JIC hydraulic fittings and adapters sharp in the foreground with a gray forestry harvester blurred behind in the woods

Fittings and Adapters for Forestry Hydraulics

Extreme-Duty Fittings and Adapters for Forestry Applications

European-origin forestry equipment (Ponsse, John Deere Forestry, Komatsu Forest, Logset) commonly uses BSP and metric O-ring face seal fittings. North American equipment tends to use JIC and ORFS. HSC carries both metric and SAE fitting lines and the full range of cross-standard adapters.

A mixed-fleet forestry operation does not need multiple vendors to source what it needs. All fitting types are stocked at branch counter with no minimum order.

Common Applications

BSP and metric ORFS fittings for Ponsse and Logset harvesters

ORFS fittings for John Deere Forestry skidders and forwarders

JIC fittings for older Timberjack and Clark skidder equipment

SAE flange fittings for high-pressure manifold connections

Metric-to-SAE adapter sets for mixed-fleet service operations

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Frequently Asked Questions: Forestry Equipment Hydraulics

What hydraulic hose do I need for a forestry skidder?

Skidder grapple and boom circuits require SAE 100R12 or 100R15 spiral hose, rated for continuous high-pressure and high-cycle operation at 4,000 PSI and above. Steering and accessory circuits may use SAE 100R2. Match the replacement hose inside diameter, working pressure, and fitting type to the original assembly. HSC fabricates replacement assemblies the same day at any branch.

Why do hydraulic hoses fail faster on forestry equipment than on other machines?

Three factors account for most early failures: abrasion from bark, wood chips, and debris that wear through the outer cover; continuous high-pressure cycling that fatigues wire reinforcement faster than intermittent-use equipment; and environmental exposure, including UV, wide temperature swings, and mud contamination. Using spiral hose for high-cycle circuits and adding abrasion-resistant sleeving in contact zones significantly extends service life.

What fitting standard does Ponsse harvester equipment use?

Ponsse machines manufactured in Finland use BSP (British Standard Pipe) and metric O-ring face seal fittings. Most HSC branches carry BSP and metric fittings and the adapters to interface them with SAE-standard hose and components. Bring the existing fitting or note the thread size and pitch so the correct standard and seal type can be confirmed.

Can HSC supply hydraulic parts for John Deere Forestry equipment?

Yes. HSC carries hoses, fittings, cylinders, valves, and filters compatible with John Deere Forestry equipment, including skidders, feller bunchers, and forwarders. John Deere Forestry equipment uses ORFS fittings on most circuits and SAE 100R2 and 100R12 hoses, depending on the application. HSC is an authorized Aeroquip by Danfoss distributor and can match most John Deere Forestry hose assemblies from standard inventory.

What is the minimum bend radius for hydraulic hose, and why does it matter in forestry equipment?

Minimum bend radius is the tightest curve a hose can form without damaging the internal wire reinforcement. Exceeding it causes the inner tube to crack and the assembly to fail prematurely. In forestry equipment, hoses routed around boom joints and through harvester heads often have minimal clearance. SAE 100R12 has a tighter minimum bend radius than 100R15, making it preferred for tight-routing applications.

Machine down in the woods?

Call your nearest branch or stop by the counter for same-day custom hose assembly.

Call (800) 507-9651 Contact us