Eaton 704342, Информация по ремонту

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8
Model 70342 and 70344
Disassembly
8 Remove housing gasket from housing or backplate.
9 To remove rotating kit assembly from housing, first remove
pump from vise holding the rotating kit assembly in
position. Lower pump so that the shaft end (flange end) is
up. Set the rear of housing onto table with housing flat and
rotating kit assembly at rest on table. Hole in table for
protruding shaft is required. Remove by lifting the housing
and shaft from rotating kit assembly.
Refer to Appendix B for rotating kit disassembly and inspection.
10 Remove retaining ring from the front of housing. Press the
shaft, shaft seal or spacer, and washer from housing.
Remove retaining ring, thrust washer, thrust bearing,
second thrust washer, and second retaining ring from shaft.
11 To remove camplate from housing, remove the two screws
from both sides of housing (four total) retaining seal cover
and trunnion cover. Note the location of the control shaft
before it is removed. Remove seal cover, shaft seal,
washer, and bearing from housing. Remove trunnion cover,
o-ring cover, o-ring, washer, inner race, and bearing from
housing. Slide the camplate over to one side and remove
thru the back side of housing.
Camplate Inspection:
• The finish on the piston shoe surfaces of the camplate
should show no signs of scoring.
Housing Inspection:
• Check the bearing (press fit) in front of housing. If
needles remain in cage, move freely, and setting at the
dimension shown in figure 1-4, removal not required.
1.78 mm
[.07 in.]
Numbered End
Flange End of Housing
Figure 1-4
12 Discard the shaft seal, gaskets, and o-rings from all
assemblies. Replace with new seals upon reassembly.
The following instructions apply to a variable displacement
piston pump with or without a gerotor charge pump. A tandem
pump assembly should be separated into individual pumps
before disassembly.
1 Position the pump into a protected jaw vise, clamping onto
the outer portion of the flange, with the input drive shaft
down. Remove the four cap screws retaining charge pump
adapter or backplate.
If there is no gerotor charge pump, skip to step 6.
2 Lift the charge pump adapter assembly straight up off
backplate, shaft, and gerotor. Gerotor may stay in adapter
or on backplate.
3 Remove o-ring from charge pump adapter.
4 Remove outer gerotor ring from either the charge pump
adapter or the inner gerotor ring.
Refer to Appendix A for disassembly and inspection of charge
pump adapter assembly.
5 Remove the inner gerotor ring and coupler assembly from
shaft.
6 Lift backplate straight up off of shaft and housing. Remove
valve plate from backplate or from rotating kit assembly, still
in housing.
7 From backplate remove dump valve assembly or plug
assembly, and relief valve assemblies. Note: Mark the relief
valve in relationship to the cavity it was removed, for
reassembly purposes.
Backplate Inspection:
• Check the bearing (press fit) in backplate. If needles
remain in cage, move freely, and setting is at the
dimension shown in figure 1-3, removal not required.
• Check roll pin in backplate. If tight and set to the
dimension shown in figure 1-3, removal not required.
2.79 mm
[.110 in.]
1.91 mm
[.075 in.]
Numbered End
Figure 1-3