Broderson RT-400-A, Operation And Maintenance Manual

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MANUAL OVERRIDE OF HYDRAULIC FUNCTIONS
W A R N I N G
The Rated Capacity Limiter, Anti-Two-Block System, outrigger alarm, and other systems
will not function while using the manual overrides. Use manual overrides with extreme
caution. In the event of a controls system fault, the following procedures may be used to
lower a load, stow the boom, and retract the outriggers.
1. Turn off the ignition key.
2. To override the HOIST, TELESCOPE, and TOPPING/LUFFING functions:
a. Locate the override handle under the operator’s seat. It looks like the figure be-
low. If the handle is missing, an adjustable wrench may be used.
Override Handle
b. Start the engine.
c. Using a ladder or steps, access the Upper Control Valve on the right side of the
turret.
d. Put the handle on the small protruding shaft from a valve section, indicated in the
figure below.
Upper Control Valve
e. From left to right, the sections control the HOIST, TELESCOPE, and
TOPPING/LUFFING functions. Each function must be run independently.
f. If a load is on the hook, lower the hoist, retract the boom, or raise the boom to
put the load in a safe location on the ground. Use extreme caution. The RCL will
not stop the boom motion, and the Anti-Two-Block System will not function.
g. Stow the boom by retracting the boom, raising the hook, and lowering the boom.
h. Turn off the crane.