JLG T350 Service Manual - Manual (Page 102)

SECTION 3 - CHASSIS & TURNTABLE
3-66 – JLG Lift – 3121198
3.20 DRIVE & SET
The Drive & Set Option is used to position the machine
after it has been towed to the job site. Before the drive
function can be operated, the machine must be in the
stowed position and the hand brake set. The control sys-
tem senses this by using a proximity switch on the frame
to see that the boom is completely lowered, by the tele-
scope limit switch to see that the boom is fully retracted,
and by a proximity switch near the brake release cylinder
to see that the brake is set.
Pushing down on the Drive Engagement Release Valve
causes hydraulic oil to extend the Drive Engage Cylinder.
Hydraulic flow from the drive enable valve is routed to the
flow divider which, in turn, provides flow to the Drive Direc-
tional Valve. The Drive Directional Valve receives electrical
signals through the control system from the joystick in the
platform to route the flow to the drive motors in the appro-
priate manner to achieve drive in the desired direction.
The Drive & Set system consists of the Propulsion Mod-
ule, Drive Enable Valve, Drive Directional Valve, Flow
Divider, Manual Pull Valve, Drive Motors, Drive Wheels,
Brake Release Cylinder, and Drive Engage Cylinder.
The Propulsion Module is located in the frame near the
battery charger. It is used to control the Drive Directional
Valve and the Drive Enable Valve. The module is con-
nected to and communicates with the Ground Control
Module through the CANBUS system.
The Drive Enable Valve sends oil to either the Main Valve
Bank for boom functions or the Drive Directional Valve. A
filter, check valve, priority flow valve, and relief valve are
also housed in this manifold block.
The left and right Drive Motors are attached to Friction
Drive Wheels. The Drive Engage Cylinder pushes the
Drive Motor/Friction Drive Wheel assembly against the
trailer tires. The drive motors can turn in either direction for
steering and positioning the machine.