Drive System - JLG 450A Service And Maintenance Manual

3.7 DRIVE SYSTEM

The four wheel drive system consists of one variable displace-
ment closed loop pump, four variable displacement piston
motors, gear reduction hubs, and a traction control manifold
that includes three flow dividers/combiners.
The two wheel drive system consists of one variable displace-
ment closed loop pump, two variable displacement piston
motors, gear reduction hubs, and a traction control manifold
that includes one flow dividers/combiner.
Boom Position
In Transport
Out of Transport
31215022
Drive speed is varied by a combination of drive pump dis-
placement, engine speed, and motor displacement. Traction
control is full-time and is present in all drive modes. There are
three drive modes that can be selected at the platform con-
sole. The functionality of the drive system is dependent on the
position of the boom. The following chart describes how the
system works in each drive mode.
Table 3-2. Drive System Mode Chart
Drive Selection
Max Speed
Mid-Engine
Max Torque
Max Speed
Mid-Engine
Max Torque
SECTION 3 - CHASSIS & TURNTABLE
Engine Speed when Max. Speed
Drive is Actuated MPH (kph)
High-2600 RPM 4.5(7.2)
Mid-1800 RPM 3(4.8)
High-2600 RPM 1.25(2.01)
High-2600 RPM 0.5(0.8)
Mid-1800 RPM 0.5(0.8)
High-2600 RPM 0.5(0.8)
3-7