CAT 086-9971 COVER

CAT 086-9971 (0869971) is a Caterpillar genuine dust cover (end cover) for articulation points on construction machinery. It is compatible with 259D3/279D3 skid steer loaders and 906H/907H mini excavators. Used at the articulation points of the working device, it provides end-face protection for 086-9824 needle roller bearings, 086-3524 bearings, and bushings, preventing the intrusion of dust, mud, water, and other foreign matter, avoiding abnormal wear of the bearings and bushings, and ensuring long-term stable operation of the articulation points.

Core Parameters and Information

Item Details
Part Model: CAT 086-9971 (0869971) Hinge Point Dust Cover (End Cover)

Type: Dust cover for construction machinery hinge points

Material: 304 stainless steel, surface polished + passivated, weather-resistant and rust-proof; sealing ring is nitrile rubber (NBR), oil-resistant and wear-resistant

Key Dimensions: Outer diameter 70mm, inner diameter 55mm, thickness 8mm, mounting hole diameter 60mm, sealing ring inner diameter 55mm, cross-sectional diameter 2.5mm

Compatible Models: CAT 259D3/279D3 skid steer loaders, 906H/907H mini excavators

Matching Relationship: Compatible with 086-9824 needle roller bearings, 086-3524 bearings, 086-8762/086-8559 Matching retainer for end face protection of articulation point assemblies.

Suitable for:
Sites: Skid steer loaders, mini excavators, and other articulation points such as boom and frame, linkage and boom. Suitable for harsh working environments such as dusty, muddy, and humid conditions.

Applications: Outdoor operations such as excavation, loading, and bulldozing. Effectively prevents foreign object intrusion, reduces bearing and bushing wear, extends component lifespan, lowers maintenance costs, and improves equipment efficiency and reliability.

Compatible with: 086-9824 needle roller bearings, 086-3524 bearings, and 086-8762/086-8559 retainers. The dust cover protects the end face, the retainer axially positions the bearing, and the bearing and bushing ensure operation, forming a complete protection and positioning system.

Installation and Maintenance Points

Installation: Clean the mounting area and check the integrity of the sealing ring; insert the sealing ring into the groove of the dust cover and apply grease; smoothly insert the dust cover into the mounting hole, ensuring a tight fit with the mounting surface without looseness or gaps to guarantee protective effect.

Maintenance: Every 200 hours, check the dust cover for deformation, cracks, and rust, and the sealing ring for aging, damage, and oil leaks; replace any problematic parts promptly to prevent foreign object intrusion.

Replacement: Use snap ring pliers to remove the retainer and remove the old dust cover; clean the mounting area and groove, replace with a new dust cover and sealing ring, and install the retainer, ensuring a secure fixation and adequate protection.