Case 580SR, Service Manual

Page: 612 / 1068

22 SECTION 35 - HYDRAULIC SYSTEM
Inspect the wear track cut by the gears in pump
body. The body can be reused if the track is bright
and polished and does not exceed 0.08 - 0.076 mm
in depth.
Examine bearing block faces for scoring and flat-
ness paying particular attention to the face which
abuts the gears. Examine bearing block bushes for
scoring. Examine pump gears for scored or worn
side faces, journals and damaged teeth.
If pump block, gears or bearing blocks are worn and
require replacement the pump assembly must be re-
placed. Reassembly follows the disassembly proce-
dure 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 using identification let-
ters scribed during disassembly.
Z
Ensure plastic back-up seals are correctly posi-
tioned in the rubber seal.
DISASSEMBLY FRONT PUMP
To remove from the pump assembly (26) from the
flange (29) it’s necessary to remove the snap ring
(32).
Remove and replace the seal rings (30) and (31).
Identify and note the position of each bearing block
to ensure correct reassembly.
Disassemble the gears (28) and (34), the seals (33),
the elastic retainers (22) and the bearings (23).
Wash all components in approved degreasant.
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