SUTPHEN TOWERS, INC. 2012
Manual-2012
_SL75-SA75-SP70.docx
Page 19 of 55
8/31/2012
SAFETY INTERLOCK SYSTEM
The safety interlock system prevents operating the tower until the stabilizers are properly set.
The system is an electric hydraulic locking device. When the stabilizers are properly set,
hydraulic power is transferred to the aerial controls.
To operate, place the PTO in gear according to the instructions in the cab. To operate the aerial
properly, pull out the step at the pump panel. Depress the “LOWER” switch. Use the "Hi-
Speed" until the jacks are completely out and down. Set the pins.
The aerial is now ready for operation. The hydraulic transfer valve should have shifted from
jack to aerial position, allowing the controls to operate the aerial ladder. The aerial ladder must
move on low speed when there is any danger, electric wires, buildings, at close operations,
returning to the cradle, and during operation around the cab. Return the aerial to the cradle,
remove jack pins, and push the "Jack Release" switch. The hydraulic circuit will transfer, locking
out the aerial ladder functions and allowing jack operation. The aerial ladder must be operated
with respect, discretion, and proper training.
The stabilizers must be visually checked by the operator or a designated
person to make sure the stabilizers and pads are properly set and safety pins
inserted.
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