Charge Pump Disassembly
1.
Make sure hydrostat is cleaned thoroughly before
2
disassembly to prevent contamination.
2.
housing for reassembly.
Match mark charge pump housing and variable
3
7
3.
and abrasive residue that could damage the lip seal.
Clean shaft to remove all sharp edges, burrs, dirt,
5
4.
Remove both cap screws securing the pump hous-
ing to the variable housing.
6
5.
lip seal carefully off the shaft. Slide gerotor assembly off
the shaft.
Slide charge pump housing with needle bearing and
8
6.
discard.
Remove O–ring from the charge pump housing and
1
4
Figure 41
Charge Pump Inspection
1.
2.
3.
4.
Charge pump housing
Variable housing
Shaft
5.
6.
7.
8.
Cap screw (4 used)
Needle bearing
Gerotor assembly
O–ring
1.
Inspect wear surfaces of inner and outer gear of the
Lip seal
gerotor assembly for excessive scratching and heavy
wear patterns. Replace entire gerotor assembly if either
part needs replacing.
2.
Inspect needle bearing for visible signs of wear. Re-
place bearing if needles do not turn freely or do not re-
main in cage. Replace bearing as necessary.
3.
Inspect lip seal for tears and damage that will re-
duce the sealing properties of the seal. Replace as nec-
essary.
4.
Inspect gerotor pocket inside the charge pump
housing of excessive scoring. Replace as necessary.
Charge Pump Assembly
1.
Coat both sides of gerotor assembly and pump
housing face with clean hydraulic oil.
2.
Slide gerotor assembly onto the shaft. Make sure in-
ner gear splines mesh with the splines on the shaft.
3.
Coat O–ring with clean hydraulic oil and place into
charge pump housing.
4.
Coat shaft with clean hydraulic oil. Slide charge
pump housing onto shaft being careful not to damage lip
seal.
5.
Align match marks. Secure charge pump housing to
variable housing with both cap screws.
Sand Pro 2020/3020/5020
Page 4 – 49
Hydraulic System (Rev. A)
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| Document Type | Service Manual |
| Language | English |
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