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Service Manual
H1F Bent Axis Fixed Displacement Motors, Size 080
Introduction
H1F About this manual
Warranty
H1F General instructions
Safety precautions
©
Danfoss | December 2023
This manual includes information for the installation, maintenance, and minor repair procedures for H1
bent axis fixed 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
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.
When repairing H1 fixed displacement closed circuit motors follow these general procedures:
Remove the
Chock the wheels on the vehicle or lock the mechanism to inhibit movement. Prior to
unit
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
During assembly, coat all moving parts with a film of clean hydraulic oil. This assures
moving parts
that these parts are lubricated during start-up.
Replace all O-
Danfoss recommends you replace all O-rings and gaskets during repair. Lightly
rings and
lubricate O-rings with clean petroleum jelly prior to assembly.
gaskets
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.
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
W
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.
AX465363259664en-000102 | 5
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