Pneumatic System - Goldacres Crop Cruiser G6 Operator's Manual

Pneumatic System

The pneumatic system on this machine is used to
actuate the brakes, operate the air bags, control the
cabin access ladder, activate the operator's seat and
on 4WD models, engage and disengage the centre
differential lock and operate the RapidFire system.
Air Tanks
The air system fitted to this machine incorporates
three air tanks all located on the left hand chassis
rail under the cabin. The first tank is known as the
wet tank and collects the air from the compressor
and feeds air to the second two tanks. The second
two tanks are used as reservoirs for the brakes and
supply air for the air bags.
Due to condensation in the tanks, they must be
drained daily. Tank 1 is the first tank in the system
after the compressor and receives the majority of
the fluid entering the system. To drain fluid from this
tank, a drain tap has been placed into the bottom of
this tank. The second two tanks also have drain taps
fitted and must be drained on a 10 hour or daily
basis.
To drain the air, loosen the manual drain tap on each
tank and allow the condensation and air to escape
from the tank.
CAUTION: Beware of high-speed particles leaving
the tank. Also be aware that due to the expansion of
the air the valve may become very cold.
After flowing into tank 1, the air is supplied to tank 2
and tank 3, through two one way valves. These valves
are designed to prevent de-pressurisation of tanks
2 and 3 if a fault develops above these points in the
system.
Tank two is used to supply the rear brake booster
and supply air for the front and rear air bags.
Tank three is used to supply the front brake booster
and has a drain in the bottom.
Compressor
The compressor used on this system is attached
to the timing gear case on the rear of the engine.
The output of the compressor is connected to the
input into tank number 1. To regulate the amount of
air being generated by the compressor a governor
is attached to the side of the compressor. This
governor is connected with a sense line back to tank.
G4.7, G5, G6 Crop Cruiser Operator's Manual MY19 - REV 0
The governor enables the compressor to continue
pumping until the required tank pressure is achieved.
Once this pressure is reached the governor stops
the compressor pumping air. The governor is set to
stop the compressor when a pressure of 120 PSI is
reached.
Pressure Relief Valve
To prevent the pressure within the air system
exceeding acceptable limits, tank 1 has a pressure
relief valve built onto the top of the tank. This valve
is set to operate when a pressure of 150 PSI is
reached and vents the air to atmosphere.
Pressure Protection Valve
The pressure protection valve is attached to the
outlet of tank 2, before the air is supplied to the
air bags and valves. This valve supplies air to the air
bags and valves only if the pressure within tank 2 is
at least 75 PSI. If an air bag blows then this valve will
only supply air to the bags until the pressure within
the tank drops below 75 PSI. This valve is used to
ensure that there is always sufficient air pressure in
the tanks to supply the brake boosters.
Pneumatic Cylinders
There is a pneumatic cylinder used on the cabin
access ladder. This cylinder gets air flow from the
park brake booster line. There is a flow control
needle valve, on the inlet of the cylinder, to control
the speed of the ladder when raising and falling. To
increase or decrease the speed of the ladder going
down, the needle valve on the flow control can be
screwed in to decrease the speed and screwed out
to increase the speed.
NOTE: The speed of the ladder is set at the factory
and if adjustments need to be made, ensure that the
safety precautions are followed.
Quick Release Air Coupling
Air supply is available out of the air tanks for
miscellaneous use such as to blow out filters and
nozzles etc. A Ryco 290 series, super high-flow
airline coupling has been placed in the system. This
coupling is located in the third air tank under the
machine on the left hand side.
Chapter 10 - Lubrication & Maintenance - 137