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Model SPD-6
Overview
This manual includes information for the installation, maintenance, and minor repair of the H1 bent-axis
motor. It includes a description of the unit and its individual components, troubleshooting information,
and minor repair procedures.
Performing minor repairs may require removal 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 repair. Danfoss trains and
certifies Global Service Partners on a regular basis. You can locate your nearest Global Service Partner
using the distributor locator at www.powersolutions.danfoss.com. Click on the Sales and Service link.
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 voids the warranty
unless done by a Danfoss Global Service Partner.
General instructions
Follow these general procedures when repairing H1 variable displacement closed circuit motors.
Remove the unit
Chock the wheels on the vehicle or lock the mechanism to inhibit movement. Prior to performing repairs,
remove the unit from the vehicle/machine. Be aware that hydraulic fluid may be under high pressure
and/or hot. Inspect the outside of the motor and fittings for damage. Cap hoses after removal to prevent
contamination.
Keep it clean
Cleanliness is a primary means of assuring satisfactory motor life, on either new or repaired units. Clean
the outside of the motor thoroughly before disassembly. Take care to avoid contamination of the system
ports. Cleaning parts with a clean solvent wash and air drying is usually adequate.
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 motor with a protective layer of
plastic.
Replace all O-rings and gaskets
Danfoss recommends you replace all O-rings and gaskets during repair. Lightly lubricate O-rings with
clean petroleum jelly prior to assembly.
Secure the unit
Service Manual H1B 060/080/110/160/250 Bent Axis Motors
Introduction
11024924 • Rev CB • February 2015 5
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