A 190338 GEAR HSA

The A190338 Third Pinion Gear is an HSA-manufactured transaxle gear designed for use in the transaxle countershaft assembly of Case 580 Super K backhoe loaders, including turbo variants. This component is identified as Item No. 14 in the transaxle assembly diagram.

This gear functions as the driven third pinion gear on the countershaft, responsible for transmitting power between gear stages within the transaxle. With 36 teeth, it ensures correct gear ratio, smooth power flow, and reliable torque transfer during machine operation.

Manufactured to industry-standard tolerances, this HSA gear offers dependable performance and durability suitable for heavy-duty construction applications.

Key Specifications

• Part Number: A 190338

• Component Type: Third Pinion Gear (Driven Gear)

• Teeth Count: 36 teeth

• Application Area: Transaxle countershaft assembly

• Diagram Reference: Item No. 14

• Material: Heat-treated alloy steel

• Brand: HSA

Functions & Benefits

• Transfers power efficiently within the transaxle system

• Maintains correct gear ratio for smooth operation

• Supports stable torque transmission under load

• Designed for durability in heavy-duty applications

• Direct replacement for worn or damaged gear

Compatible Models

• Case 580 Super K

• Case 580 Super K Turbo

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How to Identify a Faulty Third Pinion Gear

A worn or damaged third pinion gear in the transaxle may cause the following symptoms:

Common Symptoms

• Grinding or whining noise from the transmission area

• Difficulty maintaining smooth gear engagement

• Excessive vibration during operation

• Metal particles found in transmission oil

• Abnormal wear on mating gears

When Replacement Is Required

• Gear teeth chipped, cracked, or excessively worn

• Uneven tooth wear or pitting

• Noise persists after bearing replacement

• During transaxle overhaul or major transmission repair

þ Note: Continued use of a damaged pinion gear can cause serious damage to the transaxle assembly.
 

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