Case 580SR Service Manual page 613

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Inspect the wear track cut by the gears in the inlet
side of the pump body. The body can be reused if
the track is bright and polished and does not exceed
0.15 mm in depth.
Examine bearing block faces for scoring.
Inspect PTFE coated bearings in body or flange for
wear. If bearings are worn the bronze backing will be
revealed.
Examine pump gears for scored or worn side faces,
journals and damaged teeth.
Examine flange seal contact area on driveshaft. If
pump block, gears, bearing blocks or drive shaft are
worn the pump assembly must be replaced.
Reassembly follows the disassembly procedure in
reverse whilst observing the following:
Z Ensure all parts are perfectly clean and lubricate
bushes and gears with clean hydraulic fluid.
Z Replace all seals and O-rings.
Z Install bearing blocks into the same positions from
which they were removed.
Z Ensure back-up seals are correctly positioned in
the seal.
Assemble the inner seal, (30), with the spring and
the lip facing the pump. Install the outer seal (31),
with the spring and the lip facing outwards and refit
the snap ring (32).
Coat seal rings with high melting point grease.
NOTE: ensure seal rings are fitted back to back.
NOTE: if the seal ring recess has been scored dur-
ing seal removal, coat the outside diameter of the
seal ring with flexible gasket sealant to prevent leak-
age.
SECTION 35 - HYDRAULIC SYSTEM
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