Sinoboom ML270EJ - Testing Emergency Lowering; Function; Main Boom Emergency Lowering; Jib Boom Emergency Lowering

PRE-OPERATION FUNCTION TEST
GTTZ10EJ Operation Manual 6-11 © Mar. 2022
TESTING EMERGENCY
LOWERING FUNCTION
COLLISION HAZARD
Ensure that no person is under the
jib boom before lowering the main
boom and jib boom.
MAIN BOOM EMERGENCY
LOWERING
1. Start the machine from the ground controls.
2. Push the main boom up/down function button.
3. Simultaneously press and hold the enable button
and the up control button to raise the main boom to
full height.
4. Pull out the handle of the main boom lift control
valve.
Figure 6-5
5. The main boom should descend in place.
JIB BOOM EMERGENCY LOWERING
1. Start the machine from the ground controls.
2. Push the jib boom up/down function button.
3. Simultaneously press and hold the enable button
and the up control button to raise the jib boom to full
height.
4.
Lower the jib boom (please select one of the
following methods based on the machine
configuration):
• Method 1: Select a suitable cross screwdriver
and insert it into the jib boom lift control valve
(see the figure below for the location), and the
jib boom should descend fully.
Figure 6-6
• Method 2: Press and hold the emergency
lowering knob (see the figure below for the
location), and turn it counterclockwise to pop it
out, the jib boom should descend fully. To
release the emergency lowering: press and hold
the emergency lowering knob, and turn it
clockwise to lock it.