SECTION 3 - CHASSIS & TURNTABLE
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3.12 OSCILLATING AXLE SYSTEM
The oscillating front axle is attached to the frame by a pivot
pin, which allows all four wheels to remain on the ground
when traveling on rough terrain.
The oscillating axle incorporates two lockout cylinders con-
nected between the frame and the axle. The lockout cylinders
let axle oscillation when pilot pressure allows flow through the
axle cylinder holding valves.
When the turntable moved off center, as recognized by a cam
valve in the hydraulic swivel coupling, pilot pressure removed
from the axle cylinder holding valves and the cylinders are
locked.
When the turntable moved back to center after the cylinders
have been locked, the cylinders may not fully release until
drive is actuated.
3.13 DRIVE SYSTEM
The drive system consists of one variable displacement closed
loop pump, four variable displacement piston motors, gear
reduction hubs, and a traction control manifold that includes
three flow dividers/combiners.
Drive speed is varied by a combination of drive pump dis-
placement, engine & integrated motor/generator speed, and
motor displacement. Traction control is full-time and is pres-
ent in all drive modes. There are three drive modes that can be
selected at the platform console. The functionality of the drive
system is dependent on the position of the boom (In Transport
or Out of Transport, refer toSection 3.9, Transport Position
Sensing System and Section 3.10, Beyond Transport - Drive
Speed Cutback System for a detailed description). The follow-
ing table describes how the system works in each drive mode.
Table 3-8. Drive Mode Speeds
Boom
Position
Drive
Selection
(Toggle Switch
Location on the
Platform Console)
Engine Speed
when Drive
Control is Activated
Approx. Max
Speed (MPH)
In
Transport
Max Speed
High – 2600 RPM
3.8
Mid-Engine
Mid – 1800 RPM
0.09
Max Torque
High – 2600 RPM
1.3
Out of
Transport
Max Speed
High – 2600 RPM
0.4
Mid-Engine
Mid– 1800 RPM
0.4
Max Torque
High – 2600 RPM
0.4
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