Traction Pump Disassembly
1.Remove charge pump from variable housing (see Charge Pump Disassembly).
2.Remove lip seals from shaft and trunnion shafts (see Shaft Seal Removal).
IMPORTANT: All exposed surfaces are critical. Use caution to avoid damage to exposed surfaces.
3.Remove four cap screws and washers from the end cap. Loosen cap screws evenly to prevent distortion of parts (Fig. 45).
A.Internal spring loading should cause the end cap to separate slightly from the variable housing. If sep- aration does not occur during loosening, tap end cap with a soft hammer until parts separate.
B.Make sure valve plate does not fall and become damaged. Discard
4.Remove end cap and valve plate together from the variable housing. If valve plate remains on the cylinder block, remove it. Remove locating pin from the end cap (Fig. 45).
NOTE: The pistons may slide out of the cylinder block. Piston placement in the bores requires no special orien- tating. Do not disassemble spring or other parts from the center bore of the cylinder block.
5.Remove cylinder block assembly from the variable housing. Remove thrust plate from the counterbore in the face of the swashplate (Fig. 46).
IMPORTANT: Make sure not to damage the face sur- face on the cavity side of the variable housing.
6.Position variable housing so the large cavity faces up (Fig. 47).
NOTE: The variable housing has a cast recess that al- lows the spring pins to be driven free of the trunnion shaft and control shaft.
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| Figure 45 |
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1. | Cap screw | 6. | Locating pin |
2. | Washer | 7. | |
3. | End cap | 8. | End cap gasket |
4. | Variable housing | 9. | Needle bearing |
5.Valve plate
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Figure 46
1. | Cylinder block | 4. | Piston assemblies |
2. | Cylinder block assembly | 5. | Thrust plate |
3. | Spider | 6. | Variable housing |
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8 | 3 |
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7.Drive spring pin out of the trunnion shaft and control shaft using a 3/16 inch diameter drift punch (Fig. 47).
8.Drive control and trunnion shafts outward and out of the swashplate bore. Shafts remove easily once clear of the swashplate bore (Fig. 47).
9.Remove swashplate from the variable housing. Re- move retaining ring from the variable housing. Press shaft out with bearing and retaining ring. Remove retain- ing ring and bearing from the shaft (Fig. 47).
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Figure 47
1. | Variable housing | 7. | Retaining ring |
2. | Spring pins | 8. | Ball bearing |
3. | Control shaft | 9. | Retaining ring |
4. | Trunnion shaft | 10. | Needle bearing |
5. | Swashplate | 11. | Journal bearing |
6.Shaft
Hydraulic System (Rev. A) | Page 4 – 52 | Sand Pro 2020/3020/5020 |
