Komatsu 830E, Shop Manual

Page: 540 / 783

a. To remove the dowels, use a rod or punch and
hammer to drive them out. Place driver inside
of dowel and against end of dowel on opposite
side and tap out.
12. Repeat steps 6 and 7 for remaining seals.
13. Slide a punch of appropriate size through the
bearing and against the metal casing of the seal
(3, Figure 4-4). Hold the punch away from the
bearings and drive the seal out without damaging
seal bore or bearing. Move the punch around the
seal as it is driven out. Do not allow the punch to
rest against the seal bore or bearing while driving
the seal out.
14. Check the seal bore for scratches. If scratches are
apparent, us a four hundred grit sandpaper to
clean up the bore. Do not use coarse grit sandpa-
per. It will cut heavy grooves in the bore and will
allow the seal to leak around the O.D.
15. Wash all motor parts in clean solvent and wipe
dry with clean shop towel or blow dry with shop
air.
Inspection Of Parts
Visually inspect all parts. After a visual inspection those
parts which are in questionable condition should be
replaced with new ones.
1. Examine the bores in the gear plate.
a. If any grooves are cut deeper than .015" (.38
mm) or the plate is cracked or damaged in
some other way, it should be rejected.
2. Examine the gears.
a. If excessive wear is visible on the journals,
sides, or faces of the gears, or at the point
where the drive gear shaft rotates in the lip seal,
reject them. If keyway is excessively worn, re-
place the drive gear.
3. Examine the pressure plates.
a. They should not show excessive wear on the
bronze side. If deep curved wear marks are
visible, replace the plate with a new one.
4. Shaft seals should be replaced. All O-ring seals and
back-up rings or strips should be replaced with
new.
5. Bearing I.D.’s should have a gray coating.
a. If bronze can be seen shining through the teflon
on the inlet side, the bearings and plate they are
in, should be replaced.
Assembly
1. Using an arbor press, press the new seal (3, Figure
4-4) into flange bore.
a. Center the seal over the seal bore with metal
face of the seal facing out.
b. Make sure the seal is started and pressed
straight into the bore.
c. Place a socket wrench (having an O.D. just
slightly smaller than seal bore) against seal.
d. Press against socket and press seal in until seal
has just cleared snap ring groove in seal bore.
3. Apply two or three drops of # 290 Locite against
seal bore and O.D. of seal.
a. Hold the flange at a 45 degree angle and rotate
it slowly to allow the locite to flow all the way
around the O.D. of the seal.
4. Install the snap ring and wipe the excess Locite out
of seal bore and seal lip.
5. Install O-ring (1, Figure 4-5) in cover plate (5). After
O-ring has been placed in groove, spread a light
coat of grease on the O-ring to hold it in place.
6. If for any reason, gear plate (3, Figure 4-6) had to
be replaced, dowels (4) must be pressed into both
sides of replacement gear plate before assem-
bling it to cover plate. Dowels can be tapped in
with hammer, but it is best to use a dowel guide
and press. Whichever method is used, make sure
they are straight in dowel bores. If press is used,
do not apply rapid force on dowels. If a hammer
is used, do not drive the dowels in aggressively.
Tap them lightly until they are against the shoul-
der.
7. With matching marks made in step 2 toward you,
and the four cast recesses in the outer edge of
gear plate toward cover plate, line up dowels. Tap
gear plate lightly until it is against O-ring in cover
plate.
8. Install back-up ring (3, Figure 4-5) and O-ring (2).
9. Install O-ring (5, Figure 4-6) in pressure plate (2).
With trap (small oblong hole) in pressure plate
toward inlet side of gear plate and bronze side up,
slide pressure plate down gear bores.
10. Install drive gear in gear bore nearest to matching
mark and idler gear in opposite bore.
11. Install O-ring in remaining pressure plate . With trap
toward inlet side and bronze side down, place
pressure plate down against gear faces.
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