CAT 078-0149 SEAT SPRING

CAT 078-0149 is a Caterpillar original spring mount (pure original factory information, no additional description), compatible with 3044C/3054C engines and 306E/307E excavators, 226B3/246B3 skid steer loaders, etc. It is used for spring positioning and preload adjustment of the generator brush assembly, ensuring stable contact between the brushes and rotor slip rings. It is often used in conjunction with the 077-8717 brush and the 078-0007 retainer.

Core Parameters and Information

Item Details
Part Model: CAT 078-0149 (0780149) Spring Base

Structure Type: Stepped frustum, center positioning hole + 4 symmetrically distributed spring mounting slots, bottom with flange mounting edge

Material: ZL109 aluminum alloy, anodized surface, conforming to CAT MES A0201 specification

Key Dimensions: Base outer diameter 42 mm, center hole diameter 12 mm, base height 15 mm, spring mounting slot depth 5 mm, width 6 mm, flange outer diameter 55 mm, thickness 3 mm, mounting hole diameter 6 mm, hole spacing circle diameter 48 mm, compatible with M5 bolts

Performance Parameters: Single slot spring preload 12-15 N, operating temperature -40℃ to +150℃, coaxiality ≤0.03 mm, hardness HB90-110

Compatibility Standard: Complies with SAE J1939 brush assembly mounting standard, center hole compatible 077-8727 Bearing Inner Ring

Matching Relationship: Compatible with 3044C/3054C engines, 306E/307E excavators, 226B3/236B3/246B3 skid steer loaders; compatible with 077-8717 brushes, 078-0007 retainers, and 077-9931 retainers.

Compatible Models and Application Scenarios

Compatible Equipment: CAT 3044C/3054C engines, 306E/307E mini excavators, 226B3/236B3/246B3 skid steer loaders, and generator brush assemblies for some small wheel loaders.

Application Scenarios: Brush spring positioning and preload control ensure stable brush pressure, reduce slip ring wear, and suit continuous operation conditions.

Installation Instructions: Secure to the generator end cover with M5 bolts, torque 8-10 N·m. This is compatible with the brushes, springs, and retainers. After installation, the brush pressure should be 12-15 N, and the contact resistance ≤0.1Ω.

Installation and Maintenance Points: Clean the base, brushes, and mounting surfaces. Check for deformation and cracks. Ensure the center hole matches the shaft end and the spring mounting slot is undamaged.

Align the positioning flange with the end cover mounting surface, align the mounting holes, and tighten the bolts crosswise, ensuring no misalignment.

Post-Installation Inspection: The spring preload should be within specifications, the brushes should move smoothly, the rotor should rotate without interference, and the contact resistance should be normal when measured with a multimeter.

Maintenance: Check the spring preload and base wear every 500 hours. Replace immediately if deformed or with damaged threads.