CAT 077-9172 RETAINER ST

CAT 077-9172 is a genuine Caterpillar bracket mount (pure original factory information, no additional description). It is used to secure various brackets in the powertrain system (such as fan brackets, pump brackets) to prevent loosening due to vibration. It is compatible with small to medium-sized excavators, skid steer loaders, and engine systems. It is used in conjunction with the 077-8807 drive plate, 077-8727 bearings, etc. (Cat®…).

Core Parameters and Information

Item Details
Part Model: CAT 077-9172 (0779172) Bracket Retainer

Structure Type: L-shaped plate-shaped rigid retainer with dual mounting holes and a locating boss, suitable for side/end face fastening of brackets, compatible with flange and bolt connections

Material: 40Cr alloy steel, galvanized and passivated surface, conforms to CAT MES J4202 retainer specification

Key Dimensions: Length 65 mm, Width 40 mm, Thickness 8 mm, Locating Boss Height 5 mm, Mounting Hole Diameter 8 mm, Hole Spacing 50 mm, M8 Bolt Fitting

Performance Parameters: Rated Locking Force 6 kN, Operating Temperature -40℃ to +150℃, Flatness ≤0.05 mm, Hardness HRC32-38

Compatibility Standard: Complies with SAE J620 connection standard, locating boss compatible with CAT 077-8727 Bearing outer ring, mounting holes compatible with 077-8807 drive plate bolt hole positions.

Compatibility: Compatible with CAT 307/308 excavators, 226B skid steer loaders, 3054 engines, etc., and can be used with 077-8717 bearing retainer rings and 077-8864 retainers (Cat®…).

Compatible Models and Application Scenarios:

Compatible Equipment: CAT 306/307/308 mini excavators, 226B/236B/242B skid steer loaders, 3044/3054/3056 engines, hydraulic pump brackets, fan drive brackets, etc. (Cat®…).

Application Scenarios: Fan bracket fixing, water pump bracket locking, generator bracket positioning, hydraulic pump bracket anti-loosening, used to eliminate bracket displacement caused by vibration, ensuring stable operation of the transmission system (Cat®…).

Installation Instructions: Secure the bracket to the machine body/drive plate using M8 bolts. Compatible with 077-8727 bearings, 077-8717 bearing retaining rings, and 077-8807 drive plates. Axial clearance after installation should be ≤0.1 mm (Cat®).

Installation and Maintenance Points: Clean the bracket, retainer, and bolts. Check the retainer for deformation and cracks, and ensure the bracket holes match the retainer.

Align the retainer’s positioning boss with the bracket’s positioning surface, aligning the mounting holes. Tighten the M8 bolts in a crisscross pattern to a torque of 20-25 N·m.

Post-Installation Inspection: Ensure the retainer is not loose or wobbly, there is no relative displacement between the bracket and the machine body, and no interference between rotating parts.

Maintenance: Check the bolt torque and retainer wear every 1000 hours. Replace immediately if deformation or thread damage is found to prevent bracket loosening and component collisions.