Rear disc arm support 55903 4-hole frame 80x80 mm

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Rear disc arm support 55903 4-hole frame 80x80 mm

Rear disc arm support part number 55903 engineered for 4-hole tillage disc hubs, designed for secure mounting on 80x80 mm frame bars. Constructed from high strength steel, it guarantees precise disc positioning and rigid clamping to the implement frame, ensuring dependable operational stability and prolonged durability in the field.

Rear row optimized geometry
80x80 mm square frame fitment
Silentblock dampening compatibility

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Description

Rear disc carrier arm 4-hole hub pattern 80x80 mm frame - Part number 55903

Replacement rear disc carrier arm for compact disc cultivators and independent speed discs, commercial part number 55903. Specifically designed for the rear gang row of the machine, it provides the ideal operational angle for secondary clod sizing, soil leveling, and backfilling furrows left by the front row. Manufactured from high-tensile structural steel, it is engineered for secure clamping onto 80x80 mm square box-section frame beams and accommodates heavy-duty elastomeric silentblock dampening cords to absorb shock loads and protect against rock strikes. It features a rigid lower mounting pad pre-machined for standard 4-hole independent disc bearing hub units.

Key features

Rear row optimized geometryStructural angle configured to ensure efficient soil crumbling, residue incorporation, and smooth seedbed finish following the front disc passage.

80x80 mm square frame fitmentPrecision contact profile engineered for direct clamping onto standard 80x80 mm square tubular frame beams.

Silentblock dampening compatibilityAccommodates high-density elastomeric rubber cords providing progressive overload protection and flexible stone-trip reset.

Pre-drilled 4-hole hub interfaceRigid terminal mounting flange designed for direct pairing with 4-bolt independent disc bearing hub units.

Heavy-duty steel constructionForged and heat-treated structural alloy built to resist severe bending and torsional loads during high-speed tillage operations.

Specifications

Commercial part number	55903
Product type	Rear independent disc carrier arm
Mounting position	Rear gang row
Compatible frame profile	80x80 mm
Compatible hub interface	4-hole hub pattern
Arm material	High-tensile forged and treated structural steel

Fitting tipsBefore installing the carrier arm onto the 80x80 mm frame beam, thoroughly clean the beam clamping surface to remove dirt, loose paint, and metal burrs. Align the rear carrier arm making sure the rake angle and offset orientation correspond to the rear gang operating specifications. Seat the elastomeric silentblock cords squarely within their retention channels to ensure uniform compression. Tighten the frame clamp U-bolts evenly in an alternating sequence to the manufacturer's specified torque rating. Mount the 4-hole disc bearing hub onto the lower mounting pad, ensuring flush alignment without mechanical bind, and re-torque all fasteners after the initial 5 to 10 hours of fieldwork.