B - Ardiehl.de

HYDROSTATIC PUMP (Cont’d)
Inspection (Cont’d)
Check the needle bearing (Item 1) [A] in the housing for
proper operation.
If the bearing must be replaced, use the correct driver to
remove and install the bearing. The numbered end of the
bearing must be installed toward the inside of the pump
housing. When installed correctly, the end of the bearing
must measure 0.08–0.10 inch (2,0–2,5 mm) above the
machined housing surface.
Check the locating spring pin (Item 2) [A].
The pin must measure 0.165–0.185 inch (4,19–4,70 mm)
from the housing to the end of the pin.
Check the swashplate (Item 1) [B] and valve plate (Item
2) [B].
The surface finish must be smooth and free of scratches.
If scratches can be felt with a fingernail, replace the parts.
Check the four small holes in the swashplate surface to
make sure they are open.
Check the guide pin (Item 3) [B].
The guide pin must measure 0.29–0.31 inch (7,4–7,9
mm) from the swashplate surface to the end of the pin.
Check the spring pin (Item 4) [B].
The spring pin must be installed with the split toward the
center of the swashplate. The spring pin must measure
0.33–0.5 inch (8,4–8,9 mm) from the swashplate to the
end of the pin.
Check the end of the piston block. The surface must be
smooth and free of scratches [C].
Check that each piston moves freely in its bore [D].
Check each piston and piston shoe for wear or scratches.
Check the cylinder bores in the piston block for wear or
scratches.
Check the shoe plate. The shoe plate must be flat with no
sign of cracks or wear.
Revised June 96
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B
C
D
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CD–00075
CD–00100
CD–00101
CD–00102
853, 853H BICS Loader
–3–47– Service Manual
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