Sundstrand Tandem Pump Repairs Shaft Seal Replacement
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Figure 28 1. Retaining ring 2. O-ring
3. Seal carrier
1. Park machine on a level surface, lower cutting units, engage parking brake and stop the engine.
4. Lip seal
6. Put seal carrier in an arbor press and press out old seal. Use a properly sized pipe spacer or socket wrench for a press tool. The seal cannot be used again.
2. Remove pump assembly from machine. 7. Inspect seal carrier, new seal and o-ring for damage. Inspect sealing surface on shaft for rust, wear, or contamination. Polish sealing area on shaft if necessary.
3. Remove retaining ring from pump housing. NOTE: It may be necessary to hold inward pressure against shaft to compress cylinder block spring while removing retaining ring. 4. After removing retaining ring, seal carrier will move out approximately 1/4 in. due to cylinder block spring force on shaft. Lightly tap end of shaft with a soft mallet until seal carrier can be removed from housing. NOTE: After seal carrier is removed, the shaft and bearing assembly are free in the housing. Do not remove shaft unless unit is positioned with mounting flange UP. If unit is positioned horizontally when shaft is removed, the cylinder block could move out of place, making shaft installation difficult. 5. Remove o-ring from seal carrier.
Sundstrand Tandem Pump Repairs
8. Use an arbor press to press new seal into seal carrier. Be careful not to damage seal. NOTE: New seals are lubricated with an assembly grease. 9. Use a seal protector tool or wrap end of shaft with thin plastic to prevent damage to seal lip during installation. 10. Install o-ring into seal carrier and lubricate with petroleum jelly. 11. Slide seal carrier assembly over shaft and into housing bore. Hold inward pressure against shaft to compress cylinder block spring while pressing seal carrier into position. Install retaining ring.
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