Standard procedures
Remove the pump
Prior to performing certain minor repairs on the Series 42 pump, it may be necessary to remove the
pump from the machine. Chock the vehicle to prohibit movement. Be aware that hydraulic fluid may be
under high pressure and may be hot. Inspect the outside of the pump and fittings for damage.
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. Clean parts using a clean solvent wash and air dry.
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.
Inspect for system contamination
Inspect the pump for system contamination. If you find contamination, fully disassemble, clean, and
inspect all components of the pump using 11007277 Series 42 Axial Piston Closed Circuit Pumps Repair
Manual in conjunction with this manual.
Replace the O-rings and gaskets
Danfoss recommends you replace all O-rings and gaskets. Lightly lubricate O-rings with clean petroleum
jelly prior to assembly.
Lubricate all moving parts
During reassembly, coat all moving parts with a film of clean hydraulic oil. This will help to lubricate these
parts during start-up. For fluid quality requirements, refer to bulletin 520L0463 Hydraulic Fluids and
Lubricants, Technical Information.
Pump face orientations
Size and torque for plugs and fittings
Plug and fitting sizes appear here. Replace O-rings and lubricate with petroleum jelly whenever a plug is
removed. Torque each as indicated.
Service Manual
Series 42 Axial Piston Closed Circuit Pumps
Minor Repair
520L0638 • Rev 0300 • July 2015 35
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