Overview
The complete service and repair information for Series 51 and Series 51-1 motors is in a modular format.
Service information modules are available for the basic motor components, for each family of motor
controls, and for major repair procedures. Each module contains information on the function,
adjustment, and repair of each group of components or controls. The repair instructions module focuses
on major repair procedures.
Functional description, technical specifications, adjustment procedures, minor repair procedures, and
exploded view common parts drawings for the basic Series 51 and Series 51-1 motor components
comprise this manual. It discusses those minor repairs you can perform without removing the motor’s
end cap. These repairs will not affect the unit’s warranty.
Major repairs require removing the motor’s end cap. This manual does not describe them. Only Danfoss
Authorized Service Centers and / or original equipment manufacturers trained by Danfoss should
perform these repairs.
For information on control types see Controls on page 17.
Major repairs performed by persons other than a Danfoss Authorized Service Center or trained OEM
personnel may void the unit’s warranty
Ordering replacement parts and service
Order genuine Danfoss replacement parts to ensure the best performance. For lists of available service
parts and service kits for Series 51 units, see 520L0765 through 520L0770.
Danfoss provides a complete repair and parts service for all products. Contact any Danfoss Authorized
Service Center for details. Check our web site at http://www.sauer-danfoss.com to see a list of Danfoss
Authorized Service Center locations.
Safety precautions
Always consider safety precautions before beginning a service procedure. Protect yourself and others
from injury. Take the following general precautions whenever servicing a hydraulic system.
Unintended machine movement
Warning
Unintended movement of the machine or mechanism may cause injury to the technician or bystanders.
To protect against unintended movement, secure the machine or disable/disconnect the mechanism
while servicing.
Flammable cleaning solvents
Warning
Some cleaning solvents are flammable. To avoid possible fire, do not use cleaning solvents in an area
where a source of ignition may be present.
Service Manual
Series 51 and 51-1 Motors
Introduction
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Danfoss | March 2016 11008567 | AX00000013en-US0202 | 5
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