4.10 Boom Cleanliness Guidelines; Platform Control Enable System (Trigger); 4.12 Side Entry Platform; 4.13 Hydraulic Manual Descent System - JLG T500J Service And Maintenance Manual

4.10 BOOM CLEANLINESS GUIDELINES

The following are guidelines for internal boom cleanliness for
machines used in excessively dirty environments.
1. JLG recommends use of JLG Hostile Environment Pack-
age to keep internal portions of a boom cleaner and
help prevent dirt and debris from entering the boom.
This package reduces the amount of contamination
which can enter the boom, but does not eliminate the
need for more frequent inspections and maintenance
when used in these types of environments.
2. JLG recommends you follow all guidelines for servicing
your equipment in accordance with instruction in the
JLG Service & Maintenance Manual for your machine.
Periodic maintenance and inspection is vital to proper
operation of the machine. Frequency of service and
maintenance must be increased as environment, sever-
ity, and frequency of usage requires.
3. Debris and contamination inside the boom can cause
premature failure of components and should be
removed. Methods to remove debris should always be
done using all applicable safety precautions outlined in
the JLG Operation & Safety Manual and the JLG Service
& Maintenance Manuals.
4. The first attempt to remove debris from inside the boom
must be to utilize pressurized air to blow the debris
toward the nearest exiting point from the boom. Make
sure that all debris is removed before operating the
machine.
5. If pressurized air cannot dislodge debris, then water
with mild solvents applied with a pressure washer can
be used. Wash debris toward the nearest exiting point
from the boom. Make sure all debris is removed, no
"puddling" of water has occurred, and boom internal
components are dry before operating machine. Make
sure you comply with all federal and local laws for dis-
posing of wash water and debris.
6. If pressurized air or washing boom does not dislodge
and remove debris, disassemble boom following
instructions outlined in the JLG Service & Maintenance
Manual to remove debris.
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SECTION 4 - BOOM & PLATFORM
4.11 PLATFORM CONTROL ENABLE SYSTEM
(TRIGGER)
The platform controls make use of a time dependent enable
circuit to limit the time availability of "live" or enabled controls.
To operate any directional function, the trigger switch on the
joystick must be depressed before activation of the function.
When the switch is depressed, the controls are enabled and
the operator has 7 seconds to operate any function. While the
controls are "live", the enabled light will be illuminated in the
platform display panel. When the time limit has been reached,
the enabled light will turn off and the controls will be "dead"
or disabled. To continue use of the machine the controls must
be re-enabled to start the timer system over again. This is
done by releasing all functions, then releasing and re-depress-
ing the trigger switch.

4.12 SIDE ENTRY PLATFORM

The aluminum side entry platform is the common platform for
all markets. It is 30" X 48" and has a drop bar gate.

4.13 HYDRAULIC MANUAL DESCENT SYSTEM

The manual descent allows retrieval of an elevated boom in
the event of a power failure. The valves are manually operated
and fluid is moved with a hand pump to charge the system to
allow lift down and to operate telescope in or out. The swing
motor can be actuated using a ½" drive ratchet.
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