Service Manual
Series 45 J Frame Open Circuit Axial Piston Pumps
520L0607
• Rev AI • Sep 2013
23
Minor Repair
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.
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.
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.
C
Remove second seal if pump is so equipped. See
illustration below.
3. Puncture the face of the seal with a packing
hook, or use a slide-hammer type puller to
remove the seal.
Installation
4. 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.
5. 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.
6. 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.
Install second seal if pump is so equipped. See illustration below.
7. Using the appropriate snap ring pliers, install the seal retaining ring.
8. Remove the installation sleeve.
Shaft seal and retaining ring
C
Caution
Don’t damage the pump
housing or shaft.
K020
K010
E101 187
K020
K010
E108 672E
K020
Double seal and retaining ring