Single-Reach Scissor Arms
4500 SRM 971
WARNING
The points between the scissor arms and the
rear frame are pinch points and can cause an
injury.
DO NOT put your finger in the hole
when you remove the pins. Use a hammer and
brass punch to remove the pins.
6.
Remove the pivot pins that fasten the scissor arm
weldment to the rear frame. Move the scissor
arm weldment and put it on the floor without
damaging the hose sheave mount. Remove the
bushings.
7.
If necessary, install the forks and load backrest
as described in Fork Replacement and Load
Backrest Removal and Installation.
CLEAN AND INSPECT
WARNING
Cleaning solvents can be flammable and toxic
and can cause skin irritation.
Always wear
the proper protective equipment including
eye protection and petroleum resistant gloves
when handling. Always follow the recommen-
dations of the manufacturer.
CAUTION
DO NOT use steam to clean sealed bearings.
DO NOT use compressed air or immerse in sol-
vent to clean sealed bearings. Sealed bearings
are self-contained and permanently lubri-
cated. Wipe bearings off with a clean cloth and
turn to check for proper operation. Replace if
movement is restricted or if bearing does not
turn smoothly.
Clean all of the parts of the scissor arm assembly
with solvent. Inspect the parts of the scissor arm
assembly for damage and wear. Replace all bushings
and load rollers.
ASSEMBLE AND INSTALL
NOTE:
Safety chain the rear frame and mast weld-
ments to keep the rear frame and mast weldments
from moving. Install the safety chains as described
in Safety Procedures When Working Near Mast in
this section.
NOTE:
Always use new bushings and load rollers.
Install a thin coat of multipurpose grease on all
new bushings, all thrust washers, all shims, all stub
shafts, and all pins of the scissor arm assembly.
WARNING
The points between the scissor arms and the
rear frame are pinch points and can cause an
injury.
DO NOT put your hands near pinch
points when removing the pivot pins. Use a
hammer and brass drift to remove the pivot
pins.
1.
Use a crane and chains or slings as a support for
the scissor arm weldment. Do not damage the
hose sheave mount. Move the weldment into a
position of alignment to install the pins that fas-
ten the weldment to the rear frame. Install the
bushings, pins, and shoulder bolt. See Figure 15.
WARNING
The scissor arms are heavy and can cause an
injury if allowed to fall. Have another person
help you support the scissor arm during re-
moval and installation.
2.
Install two thrust washers and the bushing on
each stub shaft of the scissor arm weldment. In-
stall the right-hand and left-hand scissor arms
as shown in Figure 10. Use the other two thrust
washers, the end cap, lockwashers, and cap-
screws on each stub shaft and bushing. Tighten
the three capscrews at each end cap to 41 N•m
(30 lbf ft).
WARNING
The scissor assembly is heavy and can cause
an injury during installation. NEVER put any
part of your body between the rear frame and
the scissor arm assembly. NEVER put any part
of your body between the parts of the scissor
arm assembly.
CAUTION
DO NOT let the load rollers or shims fall off the
scissor arms.
NOTE:
Correct placement of shims is critical for the
operation of the reach carriage assembly. Unless the
shims are installed correctly, the reach carriage as-
sembly will not operate.
3.
Slowly raise the weldment so you can install the
shim sets and load rollers on each scissor arm
as marked during removal and disassembly. If
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