Komatsu 830E-AC Shop Manual page 491

12. Tighten two cap screws 180° apart and adjacent
to the 13 mm (0.50 in.) diameter depth mea-
surement holes (3) to 81 N·m (60 ft lbs). Some
movement of the retainer and bearing race
must be observed. If no movement is observed,
repeat Step 11. Then rotate the wheel hub a
minimum of three revolutions.
13. Tighten the same two cap screws to 149 N·m
(110 ft lbs) while rotating the hub.
14. Using a depth micrometer, measure and record
the depth to the end of the spindle from the face
of the retainer plate through each of the two
holes in the retainer plate adjacent to the cap
screws tightened in step 12.
15. Add the two depth dimensions measured in step
13 and divide the total by 2, to obtain an aver-
aged depth dimension.
Record average Depth (d
16. Subtract the dimension stamped on the face of
the retainer plate from the averaged depth
above to determine the required shim pack.
ave. Depth(d ) - plate Thickness(t
a
d - t = _______________ Shim Pack
a p
NOTE: The above procedure results in a shim pack
which will provide a nominal 0.178 mm (0.007 in.)
preload for the bearings.
17. Assemble a shim pack equal to the dimension
established in step 16 within 0.03 mm (0.001
in.).
NOTE: Shim pack must be compressed when
measuring.
18. Reinstall tire support chains (2 & 3, Figure 3-
10).
19. Remove cap screws and retainer.
20. Install shim pack and reinstall retainer, cap
screws, and hardened washers.
21. Remove tire support chains (2 & 3, Figure 3-
10).
G03029
):______________
a
)=Shim Pack
p
Front Wheel Hub and Spindle
22. Tighten all cap screws alternately to 1017 ± 102
N·m (750 ± 75 ft lbs) torque in several succes-
sive increments while rotating the hub.
23. Using a new O-ring (10, Figure 3-5), install
cover (3). Install cap screws and washers (2)
and tighten to standard torque.
24. Rotate the wheel hub to position the fill plug (4,
Figure 3-5) at the 12 o'clock position. Remove
the fill plug and level plug (6). Fill wheel hub
assembly at fill hole with SAE 80W-90 oil. When
properly filled, oil should be present at the level
(lower) hole. Replace fill and level plugs.
25. Remove suspension support chain (1, Figure 3-
10) if installed, and all cribbing. Lower truck
chassis so tire is on the ground.
OIL SAMPLING PROCEDURE
The front wheel bearings must be removed and
inspected every 5,000 hours.
However, Komatsu will now allow the use of sched-
uled oil sampling as an alternate method of monitor-
ing the front wheel bearings. Customers using this
method must check the condition of the oil at regular
intervals. A history of these inspections must also be
maintained, and reviewed after each oil sample. This
review is an important part of the oil sampling pro-
cess, as it identifies trends and/or significant
changes in the condition of the oil, which are indica-
tive of a pending bearing problem.
Customers that use the oil sampling method of moni-
toring the wheel bearings will not be required to per-
form the 5,000 hour disassembly and inspection of
the front wheel bearings until a problem is identified
in the oil samples.
The oil sampling method requires a magnetic drain
plug in the wheel hub cover. If needed, order and
install magnetic drain plug (R2491) to replace the
standard drain plug (H6881) in the front wheel hubs.
G3-13