---
title: "ASTM D4998"
url: "https://mat-cs.com/astm-d4998/"
description: "This test method is used to screen lubricants for gear wear. It is primarily applicable to tractor hydraulic fluids but may be suitable for other applications."
---

ASTM Standard

# ASTM D4998

Standard Test Method for Evaluating Wear Characteristics of Tractor Hydraulic Fluids

[Back to all techniques](/analytical-techniques/)

## Significance and Use

5.1 Many modern tractor designs use the hydraulic fluid to lubricate the transmission and final drive gears. This test method is used to assess the suitability of the tractor hydraulic fluids as lubricants for transmission and final drive gears of tractors.

## Scope

1.1 This test method is used to screen lubricants for gear wear. It is primarily applicable to tractor hydraulic fluids but may be suitable for other applications.

1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.