LOAD KING 35-127 M, Operator'S Manual

Page: 72 / 216

72
35-127 M
Description Of Machine and Controls
ATB Components
CABLE REEL
The ATB cable is wound onto a spring loaded cable reel which is bolted to the left side of the boom base�
The reel allows the cable to pay-out and pay-in as the length of the boom is changed� The cable reel has
slip rings which allow electric current to flow even while the reel is turning� This cable and reel assembly
is also used to measure boom extension when the Boom Truck is fitted with an RCI system�
SHEAVE ASSEMBLIES
The sheave assemblies are installed on the side of the boom and, if equipped, on the side of the jib� The
sheaves should be checked periodically to make sure they are free turning and smooth� Rough or
sticking sheaves should be replaced as they could damage the ATB cable�
LIMIT SWITCH
An ATB switch is mounted on the left side of the boom tip� The switch is normally open� During operation
the switch is held closed by a counterweight suspended from the switch lever by a chain� The closed
limit switch allows current to close the relay in the junction box in the pedestal� When the load block (or
downhaul weight) is lifted too high, it will lift the counterweight� This action will cause the limit switch to
open, breaking the circuit to the relay� This, in turn, de-energizes the coil on the unloader block assembly�
ATB Components
1 2-Block Wire 5 2-Block Chain
2 2-Block Reel 6 2-Block Weight
3 Sheave Assembly 7 2-Block Wire Going to Electrical Box
4 2-Block Switch