Komatsu 930E-2, Руководство по ремонту

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INSPECTION OF PARTS
1. Examine the gear bores in both gear plates, refer-
ence Figure 3-9. During the initial break-in, the
gears cut into the aluminum gear plates. The
nominal depth of this cut is 0.008 in (0.203 mm)
and should not exceed 0.015 in (0.381 mm). As
the gear teeth cut into the gear plates, metal is
rolled against the pressure plates. Using a knife or
sharp pointed scraper, remove the metal that was
rolled against the pressure plates. Remove all
metal chips that were broken loose.
When removing the rolled up metal, do not attempt
to remove the gear track-in grooves.
2. Examine the pressure plates. They should not
show excessive wear on the bronzed side. If deep
curved wear marks are visible, discard and re-
place with new.
3. Examine the gears. If excessive wear is visible on
the journals, sides, or face of the gears, or at the
point where the drive gear rotates in the lip seal,
discard and replace with new.
4. If any of the internal parts show excessive wear,
replace with new. Replace all O-rings and seals
with new.
5. Inspect the bearings, if they are worn beyond the
gray teflon into the bronze material, the complete
flange connector plates or bearing plate should
be replaced.
NOTE: Replacing new bearing in the flange, connector
plates or bearing plate is not recommended due to
close tolerances and special tooling required for
crimping the bearing in place to prevent bearing spin.
6. Inspect the flange seal bore for scratches or
gouges which may interfere with shaft seal instal-
lation.
7. For additional pump and system inspection refer
to the Troubleshooting Guide.
Assembly
1. A suitable seal press ring or plug and two small
wood blocks should be available.
2. The following seal installation procedures are out-
lined for use with a vise, but they can be adapted
for use with a press if one is available.
3. Open the vise jaws wide enough to accept the
combined thickness of the flange, wood blocks
and press ring.
4. Place the wood blocks flat against the fixed jaw of
the vise. Place the flange plate against the blocks
in such a position that the bearing projections are
between the blocks and clear of the vise jaw, refer
to Figure 3-10.
5. Lubricate the seals with hydraulic oil. Position the
inboard shaft seal (3, Figure 3-11) with the metal
face toward the outboard end of the flange.
FIGURE 3-9. GEAR BORE INSPECTION
1. Gear Track-in 2. Gear Plate
FIGURE 3-10. SHAFT SEAL INSTALLATION
1. Flange
2. Wood Blocks 3. Bearing Projection
L3-8 Hydraulic Component Repair L03027