9.
and wearplate (18).
Remove seal ring (5) that is between the rotor set
3. Inspect commutator ring (23) for cracks and burrs.
Replace commutator ring as necessary.
10.
if it was not removed with rotor set and wear plate (18).
Remove seal ring (5) from housing (3).
Remove drive link (13) from the coupling shaft (11)
4. Inspect commutator (16) for cracks, burrs, wear,
scoring, chipping, and peening. If any of these condi-
tions exist, replace commutator and commutator
ring (23) as a matched set.
11.
Remove thrust bearing (12) from the top of the cou-
pling shaft (11).
5. Inspect springs (28), shuttle valve (29), and ball (30)
for cracks, wear, and distortion. Replace parts as neces-
sary. Replace both springs as a matched set.
12.
Check exposed portion of coupling shaft (11). Re-
moved all signs of rust and corrosion which might pre-
vent its withdrawal of shaft through the dirt and water
seal (1) and outer bearing (2). Crocus cloth or fine emery
paper may be used.
13.
Remove coupling shaft (11) from the housing (3);
push on the output end of the shaft.
14.
Remove inner seal (7) and back–up washers (4 and
6)
from the housing by working them around the un-
seated thrust washers (8) and thrust bearing (9). Do not
remove the thrust washer (Fig. 64).
15.
Remove housing (3) from the vise and invert it. Re-
move dirt and water seal (1). A blind hole bearing or seal
puller is required.
Figure 64
IMPORTANT: NOTE position of the springs (28),
shuttle valve (29), and ball (30) as they are removed
from end cover (24).
16.
Match mark one plug (26) and end cover (24). Re-
move that plug and O–ring (27). Remove springs (28),
shuttle valve (29), and ball (30). Remove remaining plug
and O–ring.
Inspection (Fig. 60)
1.
Inspect bolts (14) for damaged threads and sealing
rings under the bolt head. Replace if damaged (Fig. 65).
Figure 65
NOTE: A polished pattern (not scratches) on the end
cover (24 or 25) from rotation of the commutator (16) is
normal. Discoloration would indicate excess fluid tem-
perature, thermal shock, or excess speed and require
system investigation for cause and close inspection of
end cover, commutator, manifold, and rotor set.
CAUTION
Use eye protection such as goggles when using
compressed air.
2.
Thoroughly wash end cover (24 or 25) in proper sol-
vent and blow dry. Make sure end cover valve apertures
are free of contamination. Inspect end cover for cracks
and bolt head recesses for good bolt head sealing sur-
faces. Replace end cover as necessary (Fig. 66).
Figure 66
Hydraulic System (Rev. A)
Page 4 – 64
Sand Pro 2020/3020/5020
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| Document Type | Service Manual |
| Language | English |
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