Minor Repair; Standard Procedures; Shaft Seal And Shaft Replacement - Danfoss T90 Series Service Manual

Service Manual
Series T90 Axial Piston Pumps

Minor repair

Standard procedures

Shaft seal and shaft replacement

© Danfoss | March 2020
Removing the pump
Before working on the pump, clean the outside of the pump. If the pump has an auxiliary pump attached,
remove both pumps as a single unit. Tag and cap all hydraulic lines as they are disconnected and plug all
open ports to ensure that contamination does not enter the system.
C
Caution
Contamination can damage internal components and void your warranty. Take precautions to ensure
system cleanliness when removing and reinstalling system lines
Pump Removal
1. With the prime mover off, thoroughly clean the outside of the pump.
2. Tag, cap, and disconnect each hydraulic line connected to the pump. As hydraulic lines are
disconnected, plug each open port, to ensure that dirt and contamination do not enter the system.
3. Remove the pump and its auxiliary pump (if applicable) as a single unit.
Be careful to not damage solenoids and electrical connections when using straps or chains to support
the pump.
Inspection
1. Ensure the work surface and surrounding area are clean and free of contaminants.
2. Inspect the system for contamination.
3. Look at the hydraulic fluid for signs of system contamination, fluid discoloration, foam, sludge, or
small metal particles.
Reassembly
1. Before replacing the pump on the machine, replace all filters and drain and fill the hydraulic system.
2. Flush system lines and fill the reservoir with the correct, filtered hydraulic fluid.
3. Fill the pump with clean, filtered hydraulic fluid.
4. Attach the pump to the prime mover. Torque mounting screws according to the manufacturers
recommendation.
5. Replace all hydraulic lines. Ensure the charge inlet line is filled with fluid.
You can replace the shaft and seal without major disassembly of the unit. Clean pump and surrounding
area thoroughly. Disconnect and remove the pump from the unit, and clean it thoroughly before starting
repairs. Mark all connections for later reassembly.
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