Komatsu 830E-AC Shop Manual page 757

6. Install a retaining strap or chain to prevent the
cylinder from extending during handling.
7. At the lower mount, straighten drive lock plate
tabs to allow cap screw removal. Remove all
cap screws (1, Figure 8-17), locking plate (2)
and retainer plate (3).
8. Carefully remove cylinder from frame pivot by
pulling outward. Move cylinder to a clean area
for disassembly.
NOTE: Do not lose spacer (6, Figure 8-17) between
cylinder bearing and frame.
9. Clean exterior of the cylinder thoroughly.
Installation
Install a retaining strap or chain to prevent the
cylinder from extending during handling. The
hoist cylinder weighs approximately 1000 kgs
(2200 lbs). Use a suitable lifting device that can
handle the load safely.
1. The hoist cylinder weighs approximately 1000
kgs (2200 lbs). Use a suitable lifting device that
can handle the load safely. Raise the cylinder
into position over the pivot point on the frame.
The cylinder should be positioned with the air
bleed vent plug toward the front of the truck.
Install spacer (6, Figure 8-17). Align bearing
eye with pivot point and push cylinder into
place.
2. Install retaining plate (3), locking plate (2),and
cap screws. Tighten cap screws to 298 N·m
(220 ft lbs) torque. Bend locking plate tabs over
cap screw flats.
3. Align the top hoist cylinder bearing eye with the
bore of the upper mounting bracket. Refer to
Figure 8-16.
4. Align retaining cap screw hole in pin with hole in
mounting bracket and install pin. Install cap
screw (5) and self-locking nut (4) and tighten to
standard torque.
L08038
5. Install new O-rings in grooves on hose flange
connections and lubricate with clean hydraulic
oil. Position flanges over hoist cylinder ports
and install flange clamps. Secure clamps with
cap screws and lockwashers. Tighten cap
screws to standard torque.
6. Reconnect lubrication lines for the upper and
lower hoist cylinder bearings.
7. Raise and lower body several times to bleed air
from cylinder. Check for proper operation and
inspect for leaks.
8. Service hydraulic tank if necessary.
FIGURE 8-17. HOIST CYLINDER LOWER MOUNT
1. Cap Screw
2. Lock Plate
3. Retainer
Hoist Circuit Component Repair
4. Retainer Ring
5. Bearing
6. Spacer
L8-15