Komatsu 930E-2 Shop Manual page 481

Disassembly
1. If removal of the hoist cylinder eye bearings is
necessary, remove retainer ring (4, Figure 8-19)
and press out bearing (5).
2. Mount the hoist cylinder in a fixture which will
allow it to be rotated 180
3. Position cylinder with the cover (10, Figure 8-20)
mounting eye at the top. Remove capscrews (11)
and lockwashers retaining the cover to the hous-
ing (4).
4. Install two 0.88 in. dia. x 9 in. long, threaded
capscrews into the two threaded holes in the
cover (10). Screw the capscrews in evenly until
the cover can be removed. Lift cover straight up
until quill assembly (22) is clear. Remove O-ring
(12) and backup ring (23).
5. Remove capscrews (7) and plate (5) attaching
the rod bearing retainer (6) to the rod (1). Re-
move the seal (8).
6. Fabricate a retainer bar using a 1/4" x 1" x 18" (6
x 25 x 460 mm) steel flat. Drill holes in the bar to
align with a pair of tapped holes spaced 180°
apart in the housing. Attach bar to housing using
capscrews (11).
NOTE: A retainer bar is required to prevent the first
and second stage cylinders from dropping out when
the housing is inverted.
7. Rotate the cylinder assembly 180
lower mounting eye at the top. Hook a lifting
device to the eye on the rod (1) and lift the rod
and third stage cylinder assembly out of the
cylinder housing.
L08024
o
.
o
, to position the
Hoist Circuit Component Repair
NOTE: As internal parts are exposed during disassem-
bly, protect machined surfaces from scratches or
nicks.
8. Rotate the cylinder housing 180
retainer installed in step 6.
9. Fabricate a round disc 12.5 in. (318 mm) in
diameter .38 in. (10 mm) thick with a .56 in. (14
mm) hole in the center. Align the disc over the
second (2) and first (3) stage cylinders at the
bottom of the cylinder housing.
10. Insert a .50 in. (13 mm) dia. x 53 in. (1350 mm)
threaded rod through the top and through the hole
in the disc. Thread a nut on the bottom end of the
threaded rod below the disc.
11. Screw a lifting eye on the top end of the rod. Attach
it to a lifting device and lift the second and first
stage cylinders out of the housing.
12. Remove lifting tools from the second and first
stage cylinder assembly.
13. Slide the second stage cylinder (2) down inside
the first stage cylinder (3). Remove snap ring (9)
from inside the first stage cylinder.
14. Remove second stage cylinder from first stage
cylinder by sliding it out the top.
15. Remove all old bearings, O-rings, and seals from
the hoist cylinder parts.
o
. Remove the
L8-15