Gradall 534B (9103-1390) Service Manual - Manual (Page 25)

General
The drive train provides two and four wheel drive
and includes the engine, torque converter
transmission, drive shaft and front and rear driving
axles.
Inching travel is directly related to drive train
functions and will be discussed in this section.
Two & Four Wheel Drive
The drive train is designed to provide two wheel
drive (front axle driving) or four wheel drive (both)
front and rear axles driving.
Under certain conditions, changing from four wheel
drive to two wheel drive may cause a difference in
the way the machine responds to steering, braking
and drive controls. Always be aware of which travel
mode you are using.
There are two ways to disengage rear wheel
drive:
NOTE: Rear drive axle can also be disengaged in
response to overload in associated electrical
circuitry causing automatic reset type circuit
breaker to trip (open). Breaker will close again in
approximately ten seconds.
Torque Converter
There are no operator controls for the torque
converter. It functions automatically to permit
starting from a standstill in any transmission speed
range.
An oil temperature gage is provided to indicate
operating temperature of torque converter/trans-
mission. Normal operating temperature is 180-
200°F. (82- 93°C.). If overheating occurs, attempt
to lower temperature by traveling in a lower gear. If
necessary, stop and allow torque converter to cool
with engine running and gear selector in neutral. Be
sure radiator fins are clean.
Transmission
The transmission provides three speed ranges for
both forward and reverse travel.
*With rear planetary hubs disengaged
There are three operator controls for the
transmission:
Front Driving Axle
The front driving axle includes a differential and
planetary drive hubs and is powered by a drive shaft
from the transmission. The service brake/inching
pedal is the only operator control for the front axle
(refer to Inching Travel heading).
DRIVE TRAIN
Shift to third gear (rear axle drive is engaged only
in first and second gears)
Disengage rear planetary hubs (refer to Rear
Drive Axle heading in this section)
1.
2.
Gear Selector Lever (for 1st, 2nd and 3rd gears)
Direction Selector lever (for forward, neutral
and reverse)
Service Brake Inching Pedal (refer to Inching
Travel heading in this section)
Release parking brake and hold handler in
position using service brake.
Move gear selector to appropriate speed range
(1st. 2nd or 3rd gear). The gear selector may be
shifted while traveling. When traveling downhill,
use the same gear needed to travel up the hill.
To Operate Transmission:
Move direction selector to forward or reverse
position.
Release service brake and depress accelerator to
attain appropriate speed.
Stop handler by releasing accelerator and
applying service brake.
Move direction selector to neutral position.
Apply parking brake.
Never shift gear selector or direction
selector to cause a sudden change of
travel speed or direction. Such a change
could cause load to shift or machine to tip
over. Reversing direction while traveling
can also damage transmission.
Continued operation of overheated torque
converter/transmission can cause serious
damage to these components.
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