About this manual
This manual includes information for the installation, maintenance, and minor repair procedures for H1
bent axis motors. 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.
Only Danfoss global service partners (GSPs) are authorized to perform major repairs.Danfoss trains Global
Service Partners and certifies their facilities on a regular basis. You can locate your nearest service partner
at www.danfoss.com > Contact us > Danfoss sales and services > Distributor and service partners
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
When repairing H1 variable displacement closed circuit motors follow these general procedures:
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.
Lubricate moving
parts
During assembly, coat all moving parts with a film of clean hydraulic oil. This
assures that these parts are lubricated during start-up.
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 For repair, place the unit in a stable position with the shaft pointing downward.
Secure the motor while removing and torquing components and fasteners.
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
H1 Bent Axis Motors, Size 060/080/110/160/210/250 cm3
Introduction
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Danfoss | August 2018 AX00000025en-US0504 | 5
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