6.Inspect manifold (22) for cracks, surface scoring, peening, chipping. Replace manifold if any of these conditions exist. A polished pattern on the ground sur- face from commutator or rotor rotation is normal.
NOTE: The rotor set consists of the rotor (19), vanes (20), and stator (21). Rotor set components may be- come disassembled during service procedures.
7.Inspect rotor set in its assembled form for nicks, scoring, and chipping on any surface. Inspect for broken and worn splines. If the rotor set component requires replacement, the complete rotor set must be re- placed as it is a matched set.
8.Place rotor set and wear plate (18) on a flat surface and center the rotor (19) in the stator (21) such that two rotor lobes (180 degrees apart) and a roller vane (20) center line are on the same stator center line. Check the rotor lobe to roller vane clearance with a feeler gage at this common center line. If there is more than 0.005 inch (0.13 mm) of clearance, replace the entire rotor set (Fig. 67).
9.Inspect the wearplate (18) for cracks, peening, and scoring. A polished pattern on the wear plate from rotor rotation is normal. Replace as necessary.
10.Inspect drive link (13) for cracks and worn or dam- aged splines. No perceptible backlash (play) should be noted between mating spline parts of the rotor (19) or coupling shaft (11). Replace as necessary (Fig. 68).
11.Inspect thrust bearing (12) for wear, peening, corro- sion and a full complement of retained rollers. Replace as necessary.
12.Inspect coupling shaft (11) internal and external splines and keyway for damage and wear. Inspect bear- ing and sealing surfaces of the coupling shaft for chip- ping, nicks, grooves, severe wear, corrosion, and discoloration. Replace coupling shaft if any of these conditions exist. Minor shaft wear in seal area is permis- sible. If wear exceeds 0.020 inch (0.51 mm) diametrical- ly, replace coupling shaft. A slight ”polish” is permissible on the shaft bearing areas (Fig. 69).
NOTE: Do not remove inner bearing (10), thrust wash- ers (8), thrust bearing (9), and outer bearing (2) from the housing (3). These parts should be inspected in place.
13.Inspect housing (3) for cracks. Inspect machined surfaces for nicks, burrs, peening, and corrosion. Re- move burrs that can be removed without changing di- mensional characteristics. Inspect tapped holes for thread damage. If the housing is defective in these areas, discard the housing assembly (Fig. 70).
Figure 67
Figure 68
Figure 69
Figure 70
Hydraulic | Systems |
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Sand Pro 2020/3020/5020 | Page 4 – 65 | Hydraulic System (Rev. A) |
