Shaft seal replacement
The Series 45 open circuit variable pumps use a lip-type shaft seal. You can replace this seal without
major disassembly of the unit. Replacing the shaft seal requires removing the pump from the machine.
Removal
1. Using the appropriate snap-ring pliers, remove the retaining ring (K010) from the housing.
2. Remove the shaft seal (K020) from the bore in the pump housing and discard.
Caution
Don't damage the pump housing or shaft.
3. Puncture the face of the seal with a packing hook, or use a slide-hammer type puller to remove the
seal.
Shaft seal and retaining ring
Installation
1. Inspect the pump housing and new seal for damage. Inspect the sealing area on the shaft for rust,
wear, or contamination. Polish the sealing area on the shaft if necessary.
2. Lubricate the lip of the new shaft seal with clean hydraulic fluid. Place a protective sleeve over the
shaft end to prevent damage to the seal during installation.
3. Keeping the seal perpendicular to the shaft, press the new seal into the housing just far enough to
clear the retaining ring groove. Install seal with the cupped side toward the shaft bearing. Do not
damage the seal during installation.
Caution
Premature bearing failure can result if the shaft seal contacts the shaft bearing.
Press the seal into the housing only far enough to clear the retaining ring groove.
4. Using the appropriate snap ring pliers, install the seal retaining ring.
5. Remove the installation sleeve.
Service Manual
Series 45 E Frame Open Circuit Pumps
Minor repair
©
Danfoss | September 2016 AX00000024en-US0401 | 29
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