Komatsu 830E, Shop Manual

Page: 472 / 783

L5-28 Steering Component Repair L05026
Swashblock Group
11. Inspect swashblock (25, Figure 5-24) for
scratches, grooves, cracks or uneven surface.
Replace if defective.
NOTE: Wear face is coated with a gray colored
epoxy based dry film lubricant for break-in purposes.
Scratching or wear of this coating is not detrimental
as long as the metal surface underneath the coating
is not scored or “picked-up”.
12. Compare saddle bearing (24) thickness in wear
area to thickness in a non-wear area. Replace
saddle bearings if difference is greater than
0.004 in (0.102 mm).
13. Check mating surface of swashblock for cracks
or excessive wear. Replace if necessary.
14. Swashblock movement in saddle and saddle
bearing (24) must be smooth.
Driveshaft Group
15. Remove shaft seal (24, Figure 5-23).
16. Check shaft bearing (2) for galling, pitting, bind-
ing or roughness. Replace if necessary.
17. Check shaft and its splines for wear. Replace
any parts necessary.
Compensator Block and Unloader Module
18. Remove screws (31, Figure 5-25) and separate
unloader module (29) from compensator block
(13).
19. Remove 4-way valve (8) and relief valve (14)
from compensator block. Remove all plugs and
orifices (10 & 30). Clean block in solvent;
inspect all passages and orifices for obstruc-
tions.
20. Remove unloader valve from block (29).
Remove plugs and clean block passages. If
unloader is inoperative, replace entire module.
Stroke Adjuster Assembly
21. Measure and record dimension “A” on stroke
adjuster assembly as shown in Figure 5-26.
22. Loosen jam nut (4). Separate stem (1) from
gland (3). Remove and discard O-ring (2).
23. Inspect parts for damage or excessive wear.
24. Install new O-ring on stem and reassemble to
gland. Adjust stem to gland to dimension “A”
recorded in step 21. Tighten jam nut.
ASSEMBLY
The procedures for assembling the pump are basi-
cally the reverse order of disassembly procedures.
During assembly, install new gaskets, seals, and O-
rings.
Apply a thin film of CLEAN grease or hydraulic fluid
to sealing components to ease assembly. If a new
rotating group is used, lubricate thoroughly with
CLEAN hydraulic fluid. Apply fluid generously to all
wear surfaces.
Swashblock Group
1. Press or tap roll pin (22, Figure 5-24) into pump
housing (20, Figure 5-23).
2. Press new shaft seal (24) into saddle (20, Figure
5-24) using an arbor press. Install O-ring (21)
into the groove in the saddle.
3. Press four roll pins (23) into saddle (20) until
they bottom, then press saddle bearing (24)
onto the pins to locate the bearing in the saddle.
Extreme care should be used to prevent damage
to saddle bearing surfaces while installing the
saddle into the pump housing.
FIGURE 5-25. STROKE ADJUSTER ASSEMBLY
1. Stem
2. O-Ring
3. Gland
4. Jam Nut