Only engage pumps while the engine is OFF. Attempting to engage the pumps
with the engine running will result in damage to the pump disconnect splines.
To Engage Pumps: Turn the ignition switch (36) on (Positon C), DO NOT start the engine.
Push PTO switch (13) all the way up. PTO light (43) should come on. If it does not, make
sure you have a minimum of 60 psi of air. If you do not, return the PTO switch to the lower
position and start the engine and run until air pressure builds. You may also need to bump
the starter to jog the engine in order to align the pump slines and turn the PTO light (43) on.
This will also transfer the gauges and throttle to the upper cab. This is the normal craning
position.
If you return the PTO switch (13) to the center position, the throttle will be returned to the
lower cab while keeping the pumps engaged. The PTO light (43) will stay on. Use this
position if you need to drive the machine while keeping the pumps engaged. An example of
this would be pick and carry work. While damage to the pump disconnect splines will not
result from making this change with the engine running, it is recommended stopping the
engine before making any change to the PTO switch (13).
T500-1 & T780 Pump Engagement Procedure (Auto & Manual Trans)
1.
With engine stopped or at idle move the rocker switch to the lower position (1) as
shown in photo below for driving the crane. (Throttle active in lower cab and
hydraulics disengaged). Before moving switch from the lower position make sure you
have a minimum of 60 psi air pressure on guage. If you do not, keep the switch in the
lower position and run the engine until air pressure builds up.
2.
Move switch to the center position (2) for work that requires moving the crane while
keeping the hydraulics active. (Throttle active in lower cab and hydraulics engaged)
PTO light should come "ON" indicating pumps are running only when engine is running.
3. Move switch to upper position (3) for normal craning function. (Throttle active in upper
cab and hydraulics engaged) PTO light should come "ON" indicating pumps are
running only when engine is running.
T300-1_T500-1_T780
Description Of Machine and Controls
94 P/N 12261-683
REVISED: January 2015
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