When using an external lifting device to raise the
platform, make sure hold-down mechanism (6) is
disengaged. Pull and hold platform release ring
during the lifting process to avoid shearing the
ratchet pawl and ratchet bar teeth.
25
Manual No. 4111-0019
May 2015
July 2016
If the platform does not rise fully on its own, it may
be necessary to use an external lifting device. Use
a lifting device with the appropriate lifting capacity to
safely raise the platform. Make sure to engage and
pin the platform maintenance prop after raising the
platform. Failure to follow these instructions could
result in death or serious injury.
ADJUSTMENTS
NOTE: Adjusting the tension of lift springs (4) usually
requires that the lip assist spring (3) also be
adjusted.
If the platform does not rise fully and/or lip does not
extend fully, the lift spring tension may be set too low.
If the platform cannot be walked down or is difficult to
walk down, the lift spring tension may be set too high.
3. After lift spring adjustment is completed, check
operation of the lip.
• If the lip folds before the platform can be walked
down, tension of lip assist spring (3) may be set
too low.
• If the lip does not fold fully or takes too long to
fold, tension of lip assist spring (3) may be set
too high.
4. Adjust lip assist spring tension as follows:
NOTE: Use two-turn increments when adjusting lip
assist spring (3). Check lip operation after each
adjustment. Repeat until proper operation is
obtained.
a. Loosen jam nut (1).
b. To increase spring compression, turn nut (2)
clockwise.
c. To decrease spring compression, turn nut (2)
counterclockwise.
d. Tighten jam nut.
5. Recheck operation of platform and lip. Readjust
lift spring tension and lip assist spring tension until
proper operation is obtained. 1. Raise the platform and engage the platform
maintenance prop. Pin the maintenance prop in
the service position using attached pin device.
2. Adjust tension of lift springs (4) as follows:
NOTE: Use 1/2 turn increments when adjusting lift
spring bolt (5).Turn clockwise to increase
tension and counterclockwise to decrease
tension. Check platform operation after each
adjustment. Repeat until proper operation is
obtained.
• To increase lift spring tension, turn lift spring
bolt (5) clockwise.
• To decrease lift spring tension, turn lift spring
bolt (5) counterclockwise.
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