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Service Manual
Introduction
Overview
Warranty
General instructions
Series 90 Pumps
This manual includes information for the installation, maintenance, and minor repair of Series 90 axial
piston closed circuit pumps. It includes a description of the unit and its individual components,
troubleshooting information, and minor repair procedures.
Performing minor repairs requires you remove the unit 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 (GSPs) is available for major repairs. Danfoss
trains GSPs and certifies their facilities on a regular basis. You can locate your nearest ASC using the
distributor locator at www.DanfossPower Solutions.com. Click on the Sales and Service link.
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 or side cover voids the
warranty unless done by a Danfoss Authorized Service Center.
Follow these general procedures when repairing Series 90 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, keep all parts 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
Use new O-rings and gaskets during reassembly. Lightly lubricate all O-rings with clean petroleum jelly
prior to assembly.
Secure the unit
520L0818 • Rev 0101 • August 2015
5
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