Komatsu 830E Shop Manual page 468

Rotating Group
Rotating group weighs approximately 30 lbs.
Extreme care must be taken not to damage cylin-
der wear face of cylinder wear plate face, bearing
diameters or piston shoes. Assistance from oth-
ers and use of proper lifting techniques is
strongly recommended to prevent personal
injury.
18. To remove rotating group, firmly grasp the cylin-
der barrel (10, Figure 5-24) and pull assembly
outward until cylinder spline disengages from
driveshaft spline about 2.5 in. (63.5 mm). Once
clear, rotate cylinder barrel a revolution or two
to break any contact between piston/shoe
assemblies (13) and swashblock (25) wear
face.
19. Slide rotating group off the driveshaft and out of
the pump housing and place it on a clean, pro-
tective surface with piston shoes facing upward.
20. Mark each piston, its cylinder bore and location
in shoe retainer for ease of inspection and
assembly.
21. Piston/shoe assemblies (13) can be removed
individually or as a group by pulling upward on
shoe retainer (27).
22. Remove fulcrum ball (12).
23. If shoe retainer springs (28) are removed, mark
which spring came from which bore as they
must be returned to that individual bore on
assembly.
24. Remove the two pins (17, Figure 5-23) and pull
the cylinder bearing (26, Figure 5-24) straight
out of the pump housing.
Swashblock Group
25. Remove the two swashblock retaining pins (19,
Figure 5-23), tilt the bottom of the swashblock
(25, Figure 5-24) outward and remove the
swashblock from the pump case.
26. Saddle bearings (24) can be removed by using a
very short screwdriver or back hammer to pry
them loose; or continue to the next step for fur-
ther disassembly which will make their removal
easier.
L5-24
Driveshaft Group
27. Remove bearing retaining ring (3, Figure 5-23).
Use a mallet on the tail shaft and tap driveshaft
(1) out from the front of the pump housing.
28. Remove seal retainer (21) from pump housing.
Use a mallet and tap saddle (20) out from the
inside of the pump housing. Saddle bearings
(24) can then be easily removed and saddle O-
ring (21) may also be removed at this time.
INSPECTION
Always wear safety goggles when using solvents
or compressed air. Failure to wear safety goggles
could result in serious personal injury.
1. Clean all parts thoroughly.
2. Replace all seals and O-rings with new parts.
3. Check all locating pins for damage and all
springs for cracking or signs of fatigue.
Control Piston Group
4. Control piston (11, Figure 5-24) must slide
smoothly in sleeve (4).
5. Linkage to cradle should operate smoothly but
not loosely (with slop). Check piston and bore in
sleeve for signs of scratching or galling. Polish
with fine emery if needed.
Valve Plate Group
6. Closely examine mating faces of valve plate (17,
Figure 5-25) and cylinder barrel (10, Figure 5-
24) for flatness, scratches or grooves. If faces
are not flat and smooth, the cylinder side will "lift
off" from the port plate (valve plate) resulting in
delivery loss and damage to the pump. Replace
if necessary.
Rotating Group
7. Check all pump piston assemblies (13, Figure 5-
24) for smooth action in their bores.
8. Check piston walls and bores for scratches or
other signs of excessive wear (pistons should
not have more than a few thousandths clear-
ance). Replace if necessary.
Steering Component Repair L05026