Arm pin wear causes visible joint play that reduces digging accuracy and puts side loads on stick cylinder seals. This boom+ arm pin gs7-521-4176 is manufactured to OEM hardness and diameter for a precise fit that restores arm joint integrity.

Compatible Machines
– GS7-521-4176

Why Choose This Boom+ Arm Pin GS7-521-4176
– Arm pin diameter and length machined to OEM specification for correct bush clearance
– Case-hardened surface (58–62 HRC) with ductile core for combined wear and impact resistance
– OEM retaining groove configuration — fits OEM locking hardware without modification

Heavy-Duty Construction
This boom+ arm pin gs7-521-4176 is manufactured using chrome-moly alloy steel with hard chrome plated bearing surface. Ground finish to h6 tolerance. Corrosion-resistant surface for wet and contaminated operating conditions. Designed to withstand vibration, impact loads, and harsh operating environments commonly found in construction, quarry, mining, and earthmoving applications. Precision manufacturing helps ensure correct fitment and long service life.

Applications
Suitable for a wide range of heavy equipment and undercarriage systems including:
– Excavators
– Dozers
– Loaders
– Track roller assemblies
– Earthmoving machinery undercarriage components

Maintenance Recommendations
– Pack the joint with EP grease before and immediately after fitting
– Replace arm pin bushes at the same service — mixed wear states cause premature failure
– Check stick cylinder pin bores for wear while the arm is disassembled

Australia-Wide Supply
We supply high-quality boom+ arm pin gs7-521-4176 replacement parts across Australia with shipping from NSW. Suitable for aftermarket heavy equipment repairs and undercarriage maintenance applications.