Eaton Hydraulic Motor

Eaton Hydraulic Motor

This is an Eaton model 5431-085, a fixed displacement, heavy-duty hydrostatic motor from their Series 1 line. Known as a 'short motor' configuration, it is specifically designed for the demanding environment of concrete transit mixers, often used as a drum drive motor. It features a 5.4 cubic inch displacement, a robust 21-spline output shaft, and is configured with a 160 PSI low-pressure relief valve (LPRV) but no high-pressure relief valve (HPRV). This motor is a critical component for maintaining consistent drum rotation and is a direct replacement for worn or failed units in various concrete mixer hydraulic systems.

Key Features

• Eaton Series 1 heavy-duty fixed displacement motor
• Displacement of 5.4 cu. in. (89.1 cm³/rev)
• 21-tooth splined output shaft
• Configured as a 'short motor'
• Includes a 160 PSI low-pressure relief valve (LPRV)
• Designed for high-torque, low-speed applications like concrete drum drives

Fits These Mixers

McNeilus, Terex, Con-Tech. This motor is a general hydraulic component for concrete mixers and is confirmed to be compatible with systems requiring an Eaton 54 series motor. It is commonly used for drum drive applications on rear discharge and front discharge mixers from manufacturers including McNeilus, Con-Tech, and Terex. Always verify specific model, shaft, and valve requirements before installation.

All measurements ± standard manufacturing tolerance.

Product descriptions are drafted with automated tools and reviewed as time allows. While we work to keep them accurate, specifications and fitment should be confirmed with a Customer Service specialist at 800-745-3414 before purchase. Found an error? Let us know and we’ll fix it.