SECTION 3 - CHASSIS & SCISSOR ARMS
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3.14 ARMS AND PLATFORM POSITIONING AND
SUPPORT
NEVER WORK UNDER AN ELEVATED PLATFORM UNTIL IT HAS BEEN
RESTRAINED FROM MOVEMENT WITH SAFETY PROPS, BLOCKING OR
OVERHEAD SLING.
The arm stack can be supported by using an overhead
crane, (See Figure 3-28.). If an overhead crane is not avail-
able the stack may also be lifted by using a fork-truck
using the following instructions:
1.
With the forks on the fork-truck slid close
together, enter from the front of the machine
and place the forks on the cross tube of the sec-
ond arm assembly below the platform.
2.
Slowly lift the arm stack with the fork-truck while
the manual descent valve is being engaged (this
allows the oil to drain back into the tank).
3.
Place machine on safety prop and leave the fork
truck in place.
4.
At this point the lift cylinder removal may begin
(Refer to Section 4.13, Lift Cylinder Removal Instal-
lation).
If removal of the platform becomes necessary use the
above procedure to stabilize the platform for pin and plat-
form removal.
3.15 PLATFORM REMOVAL
1.
Support the platform using an overhead crane
with straps capable of lifting at least 500 lbs (227
kg)
2.
Disconnect and remove the platform control sta-
tion and wiring harness at the platform. Discon-
nect AC receptacle cable if applicable. Route the
cables out through the hole at the right-rear of
the platform to free platform of any constraints
when lifting.
3.
Remove hardware securing pin to the slide
block. Carefully remove the four pin attaching
platform to the arm stack.
4.
Remove hardware securing pin to the centering
link plate at bottom side of platform. Carefully
remove the pin attaching arm attach link to cen-
tering link plate of platform.
5.
Lift the platform from the arm stack and set
aside.
NOTE:
When attaching platform back onto scissor arm
assembly, follow removal procedures in reverse
order.
3.16 SCISSOR ARMS REMOVAL
1.
Remove platform (refer to Section 3.15, Platform
Removal).
2.
Disconnect all wiring and cables attached to
scissor arm assembly.
3.
The scissor arms can be removed as a complete
unit or individually.
Removing Scissor Arm Assembly as a Complete
Unit:
1.
Remove the rotary angle sensor.
2.
Remove the ladder from the frame.
3.
Remove hardware securing pin attaching arm
link to base frame. Carefully remove pin attach-
ing arm link to base frame.
4.
Place two straps around each end of the entire
scissor arm assembly. Using an overhead crane,
slowly and carefully move the arm stack back-
wards so that slide blocks at rear of machine
slide out the rear of the slide channel on the
frame.
NOTE:
Overhead crane and straps must be capable of lift-
ing at least 2000 lbs (907 kg).
5.
Once slide blocks are clear of machine, the scis-
sor stack can be moved to a more desirable loca-
tion for further arm disassembly.
Removing/Installing Scissor Arms Individually:
See Figure 3-30. and Figure 3-31.
1.
If reusing the pins, number each pin and journal
before removing, so the pin can be reinstalled
back in same location. Odd numbers on one side
and even numbers on other side.
2.
With the platform removed, start with the top
arms (closest to platform).
3.
Secure each arm section being removed using
an overhead crane with suitable lifting straps.
4.
Remove the bolts securing the connecting pins
in place.
5.
Remove the pins from the arms.
6.
Remove the arm section from the machine using
the overhead crane.
7.
Repeat previous steps for remaining arm sec-
tions.
NOTE:
When attaching scissor arm assembly back onto
frame, follow removal procedures in reverse order.
Self locking fasteners, such as nylon insert and thread
deforming locknuts, are not intended to be reinstalled
after removal. Always use new replacement hardware
when installing locking fasteners.
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