CAT 145-0108 Spring Loaded Spool Stop

CAT 145-0108 is a Caterpillar mechanical stop (positioning lock block), compatible with Cat 950G/962G loaders, 3126/C7 engines, 777D mining trucks, and other models. It is mainly used for gearbox shifting mechanisms, engine valve rocker arms, and hydraulic cylinder piston limits to prevent components from overtravel and ensure stable operation of the transmission and power system. It is a key positioning and safety protection component. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 145-0108, Type: Mechanical stopper (metal locking block + buffer pad structure), Material: Main body 42CrMo alloy steel (tempered HRC30-35), Buffer pad: Polyurethane (hardness 90 Shore A), Surface: Oxidized black (corrosion resistance ≥48 hours salt spray), Single weight: Approximately 0.32 kg, Applicable temperature: -30℃ to +120℃, Compatible media: Mineral oil, hydraulic oil

Key Dimensions
Overall length: 65.00 mm (tolerance ±0.10 mm), Main body diameter: 25.00 mm (tolerance 0/-0.02 mm), Buffer pad diameter: 30.00 mm, Thickness: 8.00 mm, Mounting hole diameter: 12.00 mm (tolerance +0.02/+0.01 mm), Mounting hole center distance: 50.00 mm (tolerance ±0.10 mm) (mm), locking surface flatness ≤0.02 mm, chamfer C1×45°
Compatible Models and Applications: Compatible with Cat 950G/962G loader gearbox shift fork limiter, 3126/C7 engine valve rocker arm stop, 777D mining truck hydraulic cylinder piston stroke control. One piece per component, installed at the component’s extreme movement position to limit displacement and buffer impact.

Performance Parameters: Rated load capacity 50 kN, buffer stroke 3.00 mm, impact absorption energy ≥15 J, repeatability ≤0.05 mm, fatigue life ≥500,000 cycles, locking surface friction coefficient μ≥0.4 (dry state)

Structural and Performance Advantages:
Dual protection design: 42CrMo alloy steel body provides high-strength locking, polyurethane buffer pad absorbs impact, reduces component vibration and noise, suitable for heavy-load and frequent impact conditions, and extends component service life.

High-precision positioning: Strict dimensional tolerances ensure a repeatability of ≤0.05 mm after installation, guaranteeing precise operation of shifting, valve drive, and other mechanisms, preventing jamming or misalignment.

Corrosion and wear resistance: A blackened surface oxidation treatment enhances corrosion resistance; the polyurethane buffer pad is oil- and wear-resistant, suitable for long-term stable operation under harsh conditions.

Standardized installation: Adapts to original factory mounting holes, requiring no additional machining; allows for quick replacement during maintenance, improving equipment maintenance efficiency.

Installation and maintenance points: Before installation, clean the mounting surface and the stopper surface. Check for cracks in the main body and damage to the buffer pad. During installation, ensure the locking surface faces the component being limited. Use a bolt torque of 45-55 N·m, ensuring the stopper fits snugly against the mounting surface (gap ≤0.05 mm). Welding or hammering is strictly prohibited to prevent deformation.

Every 2000 hours of maintenance, check: for loose stopper, aging/cracked buffer pad, and wear on the locking surface. Replace immediately if any abnormalities are found. Regularly check the component’s travel distance to ensure it does not exceed the stop limit.

Original parts should be used preferentially. Aftermarket parts may have insufficient material strength or dimensional deviations, which may easily cause overtravel or impact damage to the parts, endangering the safe operation of the equipment.