Bush Hog Retaining Ring OEM #90717

Maintain the structural integrity and precise component retention of your Bush Hog ATH 900 spindle assembly with this Genuine OEM Retaining Ring (Part #90717). Confirmed in the official Bush Hog ATH Series Parts Manual as item #6 in the 90777 Spindle Assembly for the ATH 900 model, used in a quantity of 2 per spindle assembly — this retaining ring works directly within the spindle housing (#90695) to secure the spindle shaft (#90696), bearing cones (#50076), bearing cups (#14-6-197), and grease seals (#90700) in their correct axial positions. Precision-manufactured to exact Bush Hog factory specifications, this authentic snap ring delivers the correct spring tension, material hardness, and groove engagement needed to prevent axial movement of spindle components under the extreme rotational forces and vibration of ATH series cutting operations.

What the Retaining Ring Does:
The retaining ring — also commonly called a snap ring or circlip — is a precision-engineered split spring steel ring that seats in a machined groove on the spindle shaft or within the spindle housing bore. Once installed, it provides a positive mechanical stop that prevents axial displacement of the bearing cones, bearing cups, and related spindle components from their factory-set positions during operation. In the high-speed, high-load ATH 900 spindle assembly, the retaining rings are critical to maintaining correct bearing preload and preventing the catastrophic bearing migration that would occur if shaft components were allowed to shift axially under cutting loads. A sprung, corroded, broken, or missing retaining ring removes this axial restraint — immediately compromising bearing preload, accelerating wear across the entire spindle assembly, and risking sudden spindle failure in the field.

Signs Your Retaining Ring Needs Replacement:

• Visible deformation, cracking, corrosion, or loss of spring tension in the ring
• Ring has sprung from its groove and is loose or missing from the assembly
• Spindle shaft exhibiting axial play that cannot be corrected by bearing adjustment
• Excessive vibration or noise from the spindle during operation
• Bearing failure requiring complete spindle teardown — always replace retaining rings during full spindle service
• Ring groove damaged or worn from a previously failed or incorrect ring

Key Features:

• Genuine Bush Hog OEM part — not aftermarket or generic
• Factory-confirmed for the Bush Hog 90777 Spindle Assembly on the ATH 900 model — quantity 2 required per spindle assembly
• Precision-formed to exact groove diameter, ring thickness, and free diameter for correct snap-fit engagement
• Hardened spring steel construction maintains clamping tension against axial bearing loads through continuous high-speed cutting operation
• Prevents axial displacement of spindle shaft, bearing cones, cups, and grease seals
• Direct OEM replacement — installs to factory specification

Important Service Notes:
Always replace both retaining rings (qty: 2) when servicing the spindle assembly — never reuse a retaining ring that has been removed from its groove, as removal permanently reduces its spring tension and retention force. Use the correct size snap ring pliers for installation to avoid distorting the ring. Never force a retaining ring into its groove with a screwdriver or improvised tool. After installation, verify the ring is fully seated in its groove around the entire circumference before reassembling the spindle.

Companion Parts for Complete ATH 900 Spindle Service:

• Bearing Cup: #14-6-197 (qty: 2)
• Bearing Cone: #50076 (qty: 2)
• Blade Mount Weldment: #95287
• Grease Seal: #90700 (qty: 2)
• Spindle Shaft: #90696
• Spindle Housing: #90695
• Grease Fitting: #150002

Compatibility:
This retaining ring is confirmed for the Bush Hog 90777 Spindle Assembly used on the ATH 900 model. Always confirm fitment using your Bush Hog model and serial number — found on the equipment identification plate — and cross-reference against your unit’s parts manual before ordering to verify the correct retaining ring specification for your specific spindle assembly.

Part Details:

• Part Number: 90717
• OEM Brand: Bush Hog
• Part Type: Retaining Ring (Snap Ring / Circlip)
• Quantity Per Spindle Assembly: 2
• Application: Bush Hog ATH 900 — 90777 Spindle Assembly
• Material: Hardened Spring Steel
• Condition: New / Genuine OEM