Danfoss 45 K2 Series, Инструкции по ремонту

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Valve Plate
Inspect the valve plate for scratches and grooves. Check the plate for evidence of any cavitation along
the running face of the valve plate. If pitting from cavitation exists, replace the valve plate. Check for
excess wear on the brass running face. If any discoloration or burn marks are observed, replace the valve
plate.
Run a fingernail or pencil tip across the diameter of the sealing land surface (see illustration). No deep or
outstanding grooves should be felt, as these may decrease pump flow. Lap or replace if grooves or nicks
are present. Inspect the mating surfaces of the endcap and valve plate for any possible contamination;
even a few thousandths of an inch may affect pump operation.
Measure the thickness of the valve plate. Ensure that valve plate parallelism is equal to or less than 0.025
mm [0.001 in]. Appearance should be flat and smooth on both the running face and the bottom surface.
The valve plate should be flat to 0.005 mm [0.0002 in] convex. A magnetic particle inspection is
recommended to detect cracks. The valve plate must be replaced if any cracks exist.
Inspect valve plate
B090
3.88 mm [0.153 in] min.
0.025 mm
[0.001 in]
0.005 mm
[0.00020 in]
convex max
i
a
f
P101 419
Housing
1. Inspect the housing to ensure that it is clean and free of foreign material. Inspect the swashplate,
bearing surfaces, and endcap mating surfaces.
2. Check the corresponding servo piston bore for galling or excessive wear.
P109043
Shaft bearing kits
The tapered roller bearing kits consist of a cup and cone. Both the cup and cone should be free of
excessive wear and contamination. Rotate the bearings to check for smoothness. If a contaminated
bearing is suspected, clean with a solvent and lubricate with hydraulic fluid. If the problem is not
Repair Instructions
Series 45 Frame K2 Axial Piston Pumps
Inspection
24 | © Danfoss | April 2017 AX00000305en-US0101