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Hydrostatics Servicing Overview
This manual includes information on installation, maintenance, and minor repair of the . It includes a
description of the unit and its individual components, troubleshooting information, and minor repair
procedures.
Performing minor repairs may require 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 trains and
certifies Global Service Partners on a regular basis. You can locate your nearest Global Service Partner
using the distributor locator at
For detailed technical information about the , please see the relevant technical information document.
Attention
Major repairs requiring the removal of a unit’s center section, servo sleeves, or front flange voids the
warranty unless a Danfoss Authorized Service Center performs them.
General Servicing Instructions
Follow these general procedures when repairing this product:
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Description
Instructions
Remove the unit
•
If necessary, 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 O-ring,
gasket
•
Danfoss recommends that you replace all O-rings, seals and gaskets.
•
Lightly lubricate all 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.
•
It will be necessary to secure the pump while removing and torquing end
covers, controls, and valves.
Service Manual
H1P 069—H1P 280 Axial Piston Single Pumps
Introduction
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Danfoss | January 2021
AX152886482551en-000601 | 5