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Pump Shaft Seal Replacement (Fig. 21)
Lip type seals are used on input shaft and displacement
control shaft. These seals can be replaced without major
disassembly of pump.
1. Remove retaining ring from housing (input shaft seal
only).
2. Carefully pull seal out of housing bore. A “hook” type
tool may be used to grasp seal and pull it out, or a slide
hammer type puller may be used to remove seal. Be
careful not to damage housing bore, shaft sealing sur-
face, or bearing. After the seal is removed, it cannot be
used again.
IMPORTANT: When input shaft seal is removed,
pump block spring may push shaft partially out of
housing. Do not attempt to pull shaft out of housing.
Internal parts could move out of alignment or fall
into pump, requiring major disassembly of pump.
3. Inspect sealing area of shaft for rust, wear or contami-
nation. Polish sealing area on shaft if necessary.
4. Lubricate new seal with petroleum jelly.
5. Wrap shaft with thin plastic or use a seal protector to
prevent damage to seal lip during installation.
6. Slide seal over shaft and press it into housing bore.
Be careful not to damage the seal.
7. Install seal retaining ring into housing (input shaft seal
only).
2
4
1
installed in machine
3
Top of pump when
Figure 21
1. Retaining ring
2. Seal (input shaft)
3. Spacer
4. Seal (displacement control shaft)
Repairs Page 4 - 16 Hydroject 3010