JLG 450AJ Service Manual - Manual (Page 64)

SECTION 2 - PROCEDURES
2-48 – JLG Lift – 3120869
2.20 BOOM LIMIT SWITCHES
There are no adjustments to be made to the two boom
limit switches which bolt in place on the uprights.
2.21 LIFT UP AND PLATFORM LEVEL DOWN
DISABLE SWITCH
The purpose of the disable switch is to prevent lift up
when the boom is near full elevation and the platform is
out of level.
Adjustment
1. Position the proximity switch so that it is just flush
with the mounting bracket to ensure that it will not
come in contact with the contact plate.
2. Using the ground controls, activate level down until
the platform basket is under the boom in a position
to line up the contact plate with the limit switch.
3. Adjust the proximity switch so there is 0.030 inch
(0.8 mm) clearance between the end of the switch
and the contact plate or until the light comes on.
Functional Check
DISABLE SWITCH FUNCTIONAL CHECK MUST BE PERFORMED
QUARTERLY, ANY TIME A SYSTEM COMPONENT IS REPLACED,
OR WHEN IMPROPER SYSTEM OPERATION IS SUSPECTED.
1. Tape a small piece of metal to the end of the limit
switch (e.g. a coin).
2. Using the controls in the platform basket, test the lift
up and platform level down functions. Both opera-
tions should be locked out and not function.
3. Remove metal (coin) and return machine to service.
Figure 2-32. Switch Adjustment
CONTACT PLATE
PROXIMITY SWITCH
COIN
Figure 2-33. Functional Check