Overview
This manual includes information for the installation, maintenance, and minor repair of the Series 40 M46
tandem pump. It includes a description of the unit and its individual components, troubleshooting
information, and minor repair procedures.
Performing minor repairs requires the unit to be removed from the vehicle/machine. Thoroughly clean
the unit before beginning maintenance, or repair activities. Since dirt and contamination are the greatest
enemies of any type of hydraulic equipment, follow cleanliness requirements strictly. This is especially
important when changing the system filter and when removing hoses or plumbing.
A worldwide network of Danfoss Global Service Partners is available for major repairs. Danfoss Global
Service Partners are trained by the factory and certified on a regular basis. You can locate your nearest
Global Service Partner using the distributor locator at www.sauer-danfoss.com.
Warranty
Performing installation, maintenance, and minor repairs according to the procedures in this manual will
not affect your warranty. Major repairs requiring the removal of a unit’s rear cover or front flange voids
the warranty unless done by a Danfoss Global Service Partner.
General instructions
Follow these general procedures when repairing Series 40 M46 tandem variable displacement closed
circuit pumps.
Remove the unit
Prior to performing major repairs, remove the unit from the vehicle/machine. Chock the wheels on the
vehicle or lock the mechanism to inhibit movement. Be aware that hydraulic fluid may be under high
pressure and/or hot. Inspect the outside of the pump and fittings for damage. Cap hoses after removal to
prevent contamination.
Keep it clean
Cleanliness is a primary means of assuring satisfactory pump life, on either new or repaired units. Clean
the outside of the pump thoroughly before disassembly. Take care to avoid contamination of the system
ports. Cleaning parts by using a clean solvent wash and air drying is usually adequate.
As with any precision equipment, all parts must be kept free of foreign materials and chemicals. Protect
all exposed sealing surfaces and open cavities from damage and foreign material. If left unattended,
cover the pump with a protective layer of plastic.
Replace all O-rings and gaskets
Replace all O-rings, gaskets and seals. Lightly lubricate all O-rings with clean hydraulic fluid or petroleum
jelly prior to assembly.
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.
Service Manual
Series 40 M46 Tandem Variable Pumps
Introduction
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©
Danfoss | September 2017 11029852 | AX00000030en-US0202
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